Diagnostics of the Cummins ISF3.8 engine

The diesel electronic control system allows to reduce fuel consumption and emissions of toxic components with exhaust gases (EG), improve the quality of regulation (accuracy, smoothness and speed) and the stability of the idle speed, reduce the rigidity of the diesel engine working process.

The electronic diesel engine control system consists of sensors and switches, an electronic control unit and actuators that directly affect engine systems.

The completeness of the engine management system with sensors and actuators depends on the toxicity standard that the engine complies with (for example, Euro-3 or Euro-4), the vehicle equipment, and the purpose of the vehicle.

Information about the operating mode and state of the engine enters the control system from sensors that convert the controlled (measured) engine parameters into electrical signals that are convenient for processing and transmission in the electronic control system.

The signals from the sensors are sent to the electronic control unit, which, having processed the information received according to the specified algorithms, issues control signals to the actuators based on the driver's requests and the embedded program.

The control algorithms implemented by the microprocessor of the electronic unit, at each engine operating mode, produce the optimal (best) combination of fuel injection parameters (cyclic delivery and injection advance angle) and air charge (boost pressure and exhaust gas recirculation degree) in terms of fuel consumption and toxicity standards ).

The electronic control unit performs such operations as control of fuel cycling, fuel pressure in the accumulator, control of injection advance angle, control of idle speed, cruise control function, control of elements of subsystems for reducing exhaust toxicity.

To simplify troubleshooting, a self-diagnosis function is built into the electronic control unit, which monitors many operating parameters of both the engine itself and all elements of the control system, and when a malfunction is detected, informs the driver about this by turning on the malfunction indicators on the instrument panel.

Self-diagnosis system

To enable the diagnostic mode, you must turn the ignition key to the "I" position and turn on the test switch.

In this mode, red and yellow indicators light up, in the absence of failures they are inactive. If there is an active fault, the red indicator will flash.

The diagnostic system monitors four engine parameters: coolant level, coolant temperature, oil pressure and air temperature at the intake manifold and deforces the engine if one or more of the above parameters is out of range.

The engine protection system can apply the deboost function to engine torque, engine speed and possible engine shutdown in progressive order.

The ECU stores in memory data on the time of occurrence of events, the duration of operation, extreme pressure and temperature values \u200b\u200bwhen the ECU detects abnormal operating conditions.

Details of the data list are displayed using the programming tools.

The diagnostic test switch is designed to enable and disable the on-board diagnostics mode.

When diagnostic mode is enabled, the stop lamp (STOP) and the warning lamp (ICE) will display all active trouble codes.

The switch for diagnostics and increase/decrease idle speed increments at low speed is a two-function two-position momentary switch, after turning on the diagnostic mode, allows you to navigate through the list of fault codes.

This switch is also used when adjusting the idle speed at low speed.

The default travel step length is 25 RPM in positive and negative increments to idle speed at low RPM.

The system uses four indicator lamps: a stop lamp, a warning lamp, a maintenance lamp, and a start-waiting lamp.

When the rocker switch is set to position “1” (“turn on electrical appliances”), the indicator lamps come on, and after about two seconds they go out, one after the other - this way it confirms that the lamps are in working condition and that they are connected correctly.

In the event of a high coolant temperature, high intake manifold air temperature, low oil pressure or low coolant level, the indicator lights up and starts flashing after a while.

This blinking mode warns that the condition that has occurred has been going on for some time and the subsequent pressure or temperature condition has worsened and the engine is close to a stop condition (ECU engine shutdown is possible).

Warning indicator (ICE) warns of a malfunction and signals the start of flashing codes during on-board diagnostics.

Turning on the lamp indicates a malfunction of the engine, while the vehicle remains in working order (the situation is not an emergency).

It is necessary to carry out maintenance of the vehicle to eliminate the failure.

The stop indicator (STOP) indicates a malfunction of one of the main systems.

During the on-board diagnostics, the flashing of this lamp corresponds to the fault codes detected by the computer.

Turning on the lamp indicates a serious problem.

In this case, the bus engine should be turned off as soon as possible, as far as safety requirements allow.

The service light (KEY) is used to signal the need for service and to warn the driver that the engine fluids are out of specification.

The Start Waiting Indicator (START) warns the driver that a cold start aid is required to ensure proper starting.

Displaying fault codes

To display fault codes, turn off the engine, turn the ignition switch to the “I” position and turn on the diagnostic mode with the diagnostic test switch.

If there are no active faults, the stop and warning lamps remain on but do not flash. But if active fault codes are present, then the ECU starts to display fault codes.

Before the fault code is displayed, the warning lamp turns on, after it is turned off, the computer displays (blinks) the number of the active fault code with the stop lamp (short pauses indicate the end of the character).

When the warning lamp turns on again, the stop lamp starts displaying (flashing) the next number of active fault codes (the function of separating the next fault code from the previous one).

The ECU continues to flash the DTC until the user uses the diagnostic switch to toggle the DTC to the next or previous one.

The control system uses three- and four-digit trouble codes. Diagnostic mode remains active until the diagnostic switch is turned off or the engine is turned on.

External diagnostic tools include:

- INSITE: Windows based computer service tool for Cummins electronic engines.

Designed to assist with engine troubleshooting and troubleshooting.

- Generic Scanners: The module supports generic scanners via public data links J1587 and J1939 for CES 14601.

INSITE allows the user to display both active and inactive fault codes on the display, and to erase only inactive fault codes from the ECU.

INSITE also provides engine monitoring and dedicated diagnostic test facilities.

The data link is activated when the ignition key is turned to the "I" position, regardless of whether the engine is running or not.

The data link is used with tools offered by Cummins.

Diagnostic Trouble Codes

Code

Conditions for the appearance of the code

Result

Possible fault location

111

Internal ECU error

engine may not start

Electronic control unit

115

crankshaft and camshaft position sensors - both signals are missing, the data is different from the specified, intermittent or incorrect.

The ECU determines the main and backup sensor signalskov positions as connected vice versa.

engine may not start

Crankshaft and camshaft sensor wiring mixed up

122

Short to power boost pressure sensor circuit

Reducing engine power

• - Wiring and connectors.
• - Short to power.

123

Short to low voltage or open circuit of boost pressure sensor

Reducing engine power

• - Open or short to ground in the signal circuit or sensor.
• - Open or short to ground in the power circuit.

131

Short to power supply of the accelerator pedal position sensor circuit (channel No. 1)

Some reduction in engine power. Get home mode.

• - Short to power or 5 V sensor signal circuit.
• - Break in the ground wire of the accelerator pedal position sensor.
• - Short circuit to power supply wire of the sensor.

132

Short circuit to the low voltage circuit of the accelerator pedal position sensor circuit (channel # 1)

Some reduction in engine power. Get home mode.

- Short circuit to ground or

Ground wire of sensor signal wire.

• - accelerator pedal position sensor.
• - Broken wire or connector.

133

Remote throttle position sensor short to power

The remote control accelerator pedal does not work. The pedal opening degree is set to 0%.

• - Short to power or 5 V remote throttle position sensor signal circuit.
• - Sensor ground wire break.
• - Short circuit to power supply wire of the sensor.
• - remote control accelerator position sensor.

134

Remote throttle position sensor circuit short to low voltage

The remote control accelerator pedal does not work. The pedal opening degree is set to 0%.

• - Short circuit to ground or ground wires of the sensor signal wire.
• - remote control accelerator position sensor.
• - Broken wire or connector.

135

Short circuit to power emergency oil pressure sensor

Does not affect performance. No engine oil pressure protection.

• - Broken wire or connector.
• - Signal wire short to power.

141

Short circuit to the low voltage circuit of the emergency oil pressure sensor circuit

Does not affect performance. No engine oil pressure protection

• - Breakage of the signal wire or short circuit to ground of the motor or sensor wiring.
• - Open or short to ground of the power wire.

143

oil pressure below normal

Engine power reduction oil pressure

144

A short to power in the coolant temperature sensor circuit

White smoke possible.

The fan stays on when controlled by the ECU.

No engine protection based on coolant temperature.

• - Broken wire or connector.
• - Broken signal wire or short circuit to power.

145

Short to low voltage circuit of the coolant temperature sensor circuit

White smoke possible.

The fan stays on when controlled by the ECU.

No engine protection based on coolant temperature.

Coolant temperature

146

Coolant temperature is above normal

Power reduction.

It is possible to stop the motor if the shutdown is enabled.

Coolant temperature

151

The engine coolant temperature alarm indicates that the engine coolant temperature has exceeded the critical engine protection limit

Sequential power reduction depending on the time the alarm was activated.

If a shutdown is enabled, the engine will stop 30 seconds after the STOP indicator starts blinking.

Coolant temperature

153

Short circuit to power intake manifold air temperature sensor

White smoke possible.

The fan stays on when controlled by the ECU.

There is no engine protection for air temperature in the intake manifold.

• - Broken wire or connector.
• - Broken signal wire or short circuit to power.

154

Short circuit to low voltage circuit of the intake manifold air temperature sensor

White smoke is possible. The fan stays on when controlled by the ECU.

There is no engine protection for air temperature in the intake manifold.

• - signal closure ground wire.
• - The signal wire is shorted to ground.

155

The intake manifold air temperature sensor signal indicates that the air temperature has exceeded the critical engine protection limit

Sequential power reduction depending on the time the alarm was activated.

If a shutdown is enabled, the engine will stop 30 seconds after the STOP indicator starts blinking.

• - Increased resistance in the aftercooler.
• - Intercooler too small.
• - High temperature at the outlet of the compressor.

175

Short to power supply of the throttle motor circuit

Throttle motor not working

• - Open or short to power supply of the motor wiring.
• - Electronic control unit.

176

Short to throttle motor circuit low voltage

Throttle motor not working

• - Short to ground in motor wiring.
• - Electronic control unit.

177

Throttle motor locked open

Throttle motor not working

• - throttle position sensor.
• - throttle blocked.

187

Short circuit to the low voltage circuit of the sensor supply circuit No. 2

Power reduction

• - Short circuit to ground in the power circuit.
• - Power supply of the electronic control unit.

191

Short to ground when turning on the air conditioner

Air conditioner won't turn on

Wiring and connectors

195

Short to power in the coolant level sensor circuit

Does not affect performance

• - Broken wire or connector.
• - Shorting the signal wire to power.
• - Shorting the power wire to power.

196

Short circuit to low voltage circuit of the coolant level sensor

Does not affect performance

• - Broken wire or connector.
• - Shorting the signal wire to ground.
• - The sensor is damaged.

197

Low coolant level detected

Does not affect performance

Coolant level

212

Short to power in the engine oil temperature sensor circuit

No engine oil temperature protection

• - Broken wire or connector.
• - Broken signal wire or short to power.

213

Engine oil temperature sensor short to low voltage

No engine oil temperature protection

• - Shorting the signal wire to ground.
• - Shorting the signal wire to the ground wire.

214

Engine oil temperature sensor alarm indicates oil temperature exceeding critical engine protection limit

Sequential power reduction depending on the alarm time.

If a shutdown is enabled, the engine will stop 30 seconds after the STOP indicator starts blinking.

Engine oil temperature

221

Atmospheric pressure sensor circuit shorted to power

Power reduction

• - Open ground circuit (wire, connector or sensor).
• - The signal wire is shorted to power.

221

Atmospheric pressure sensor circuit short to low voltage

Power reduction

• - Break in the ground wire in the harness, connectors or sensor.
• - The signal wire is shorted to power.

227

Short to power supply circuit 2 for sensors

Power reduction

Short to power

234

Crankshaft speed sensor signal indicates engine overspeed above critical engine protection limit

Fuel cut off until engine speed drops to normal

• - Fuel enters the air channel.
• - Reverse scrolling of the engine.
• - crankshaft position sensor.

238

Short circuit to the low voltage circuit of the sensor supply circuit No. 3

Possibly difficult starting and uneven operation

Short to ground

239

Short to power supply of circuit No. 3 of sensor power supply

Power reduction

Short circuit to power

241

No vehicle speed sensor signal

Engine speed does not exceed the maximum value. Engine speed without speed sensor.

Cruise control, safety downshift and governor systems ra speed will not work.

• vehicle speed sensor

242

The signal is intermittent or distorted

The engine speed does not exceed the maximum value.

Engine speed excluding speed sensor.

The cruise control, safety downshift, and cruise control systems will not work.

• vehicle speed sensor

245

Fan motor circuit short to low voltage

The fan will be constantly on or will not work

Short to ground

249

Outdoor temperature sensor circuit shorted to power

Does not affect performance

• - Break in the ground wire in the harness, connectors or sensor.
• - Open or short to power signal wire.

252

Intermittent signal from engine oil level sensor

Engine oil level sensor not working

• - Open or low voltage in the power circuit.
• - Earth wire break.
• - Breakage or short circuit of the signal wire.
• - engine oil level sensor.

253

Very low oil level received from engine oil level sensor

Power reduction possible.

Possible loss of oil pressure, possible serious engine damage.

• - Low engine oil level after oil change.
• - Engine oil leaks on the ground.
• - Engine oil leaks into the fuel or cooling system.
• - High oil consumption.

254

Short circuit to low voltage circuit of the fuel cut-off solenoid valve

The fuel cutoff solenoid valve is closed, the engine is off.

• - Short circuit to ground.
• - Fuel cut-off solenoid valve

255

Short to power or open circuit of the fuel cut solenoid valve

The fuel cutoff solenoid valve may not open when the ignition is turned on or may not close when the ignition is turned off

• - Open circuit.
• - Shorting the signal wire to power.
• - Fuel cut-off solenoid valve.

256

Outdoor temperature sensor circuit short to low voltage

Does not affect performance

• - Signal wire short to ground.
• - Short to earth wire or signal wire ground.

257

Fuel cutoff solenoid valve stuck open or leaking

Power reduction, the engine may run for a short time when the key is turned to the "OFF" position.

• - Calibration of the electronic control unit.
• - An extra wire in the fuel cutoff solenoid valve circuit.

269

Attempting to start the engine without the permission of the anti-theft system will not start the engine

Immobilizer not disabled

271

Short circuit to low voltage circuit of the fuel control solenoid valve

The engine will not idle well. Reduced engine power. fuel pressure will be higher than set.

Short to ground

272

Short to power or open circuit of the fuel control solenoid valve

engine will not run or will run poorly

Short to power

281

Pumping imbalance between the injection pump plungers

Engine will not start or power loss may occur

TNVd

285

ECU receives signal from Multiplex bus too late or not at all

One or more devices connected to the Multiplex bus are not working properly

Multiplex SAE J1939 bus

286

The electronic control unit receives only part of the necessary information from devices connected to the Multiplex bus

At least one device connected to the Multiplex bus is not working properly

Multiplex SAE J1939 bus

287

The electronic control unit has detected a malfunction with the accelerator pedal

engine only idling or not running at full speed

Multiplex SAE J1939 bus

288

The electronic control unit has detected a malfunction with the remote control accelerator pedal

The engine does not respond to the remote pedal. the engine only runs at idle. Only the accelerator pedal in the cab can be used.

Multiplex SAE J1939 bus

291

The anti-theft system cannot work properly. the engine may not start.

The anti-theft system cannot work properly. the engine may not start.

• - Electronic control unit.
• - Multiplex SAE J1939 tire.
• - Imm obilizer.

295

The electronic control unit has detected an error in the atmospheric pressure sensor signal

Power reduction

• - Sensor readings are fixed in one range.
• - High resistance in the sensor circuit.

311

After turning off the ignition, a high current was detected in the No. 1 injector circuit

Nozzle power off.

Engine misfiring or running rough.

• - Open circuit in the harness, connectors or drive.
• - Short to ground of the engine wiring or injector.
• - Short to power supply of the motor wiring.
• - Low or high injector resistance.

313

After turning off the ignition, a high current was detected in the No. 3 injector circuit

Nozzle power off.

Engine misfiring or running rough.

• - Open circuit in the harness, connectors or drive.
• - Short to ground of the engine wiring or injector.
• - Short to power supply of the motor wiring.
• - Low or high injector resistance.

315

High current detected in injector #2 circuit after ignition off

Nozzle power off.

Engine misfiring or running rough.

• - Open circuit in the harness, connectors or drive.
• - Short to ground of the engine wiring or injector.
• - Short to power supply of the motor wiring.
• - Low or high resistance

injectors.

319

No real time clock power

Does not affect operation, the data in the electronic control unit does not contain the exact time and date.

• - Backup battery.
• - Wiring and connectors.

321

After turning off the ignition, a high current was detected in the No. 4 injector circuit

Nozzle power off.

Engine misfiring or running rough.

• - Open circuit in the harness, connectors or drive.
• - Short to ground of the engine wiring or injector.
• - Short to power supply of the motor wiring.
• - Low or high resistance

322

Current detected in injector #1 circuit after power off.

Nozzle power off.

Engine misfiring or running rough.

• - An open in the wiring of the engine or injector winding.
• - High resistance of the injector winding.
• - Very low winding resistance

injectors (internal short circuit of the injector, but not to ground).

• - Error or damage to the electronic control unit.

324

Current detected in injector 3 circuit after power off.

Nozzle power off.

Engine misfiring or running rough

• - An open in the motor wiring or injector winding.
• - High resistance of the injector winding.
• - Very low winding resistance

injectors (internal short circuit of the injector, but not to ground).

- Error or damage to the electronic control unit.

331

Current detected in injector #2 circuit after power off.

Nozzle power off.

Engine misfiring or running rough.

• - An open in the motor wiring or injector winding.
• - High resistance of the injector winding.
• - Very low resistance of the injector winding (internal short circuit of the injector, but not to ground).
• - Error or damage to the electronic control unit.

332

Current detected in injector #4 circuit after power off

Nozzle power off.

Engine misfiring or running rough.

• - An open in the motor wiring or injector winding.
• - High resistance of the injector winding.
• - Very low winding resistance

injectors (internal short circuit of the injector, but not to ground).

- Error or damage to the electronic control unit.

334

The signal from the coolant temperature sensor does not change when the engine is running

The electronic control unit approximately calculates the coolant temperature

• - Sensor readings are fixed in one range.
• - High resistance in the sensor circuit.

343

ECU power supply error detected

There may be a slight change in performance, the engine stalls or the engine is hard to start.

Fault information, trip computer data, or maintenance data may be incorrect.

Electronic control unit

346

Incorrect adjustable steam configurations meters of key settings are detected by the electronic control unit

Various additional switched inputs of the electronic control unit may not work properly

ECU memory software

351

The electronic control unit has detected a low boost voltage of the injector

Possible smoke, low power, misfiring, or engine will not start

• - Calibration of the electronic control unit.
• - Injector power supply.

352

Short circuit to the low voltage circuit of the sensor supply circuit No. 1

Power reduction

Short to ground

356

Air flow sensor short to power or open circuit

Possible reduction in engine performance

• - air flow sensor.
• - Electronic control unit.
• - Open ground circuit.
• - Signal wire short to power.
• - Intermittent failure.

357

Short to low voltage or open air flow sensor

Possible reduction in engine performance

• - air flow sensor.
• - Electronic control unit.
• - Broken power wire or short to ground.
• - Broken signal wire or short circuit to ground.
• - Intermittent failure.

358

Air mass sensor signal does not match engine operation

Possible reduction in engine performance

• - air flow sensor.
• - Dirty air flow sensor.
• - Air filter dirty.
• - Wiring and connectors.
• - Leaks in the intake system.

386

Short circuit No. 1 power supply of sensors

Power reduction

Short to power

415

The oil pressure alarm indicates that the oil pressure has fallen below the critical engine protection threshold

Sequential power reduction depending on the time the alarm was activated.

If a shutdown is enabled, the engine will stop 30 seconds after the STOP indicator starts blinking.

• - Low oil pressure.
• - Low oil level.
• - emergency oil pressure sensor.
• - Short circuit wiring to ground.

418

Water detected in fuel filter

Possible reduced power or difficult to start

Water in the fuel filter

425

The signal is different from the specified, intermittent or incorrect

Does not affect performance. engine oil temperature data is incorrect.

• - engine oil temperature sensor.
• - High resistance in the sensor circuit.

427

Communication between the electronic control unit and other devices via the SAE J19З9 data channel has been lost

Engine speed will gradually decrease and remain at idle

• - SAE J19З9 data channel.
• - Electronic control unit.
• - External control unit for vehicle accessories.

428

Short to power in the fuel filter water sensor circuit

Does not affect performance. Fuel filter water indicator not working

• - Broken ground wire or signal wire in the harness, connectors or sensor.
• - The signal wire is shorted to power.

429

Short circuit to the low voltage circuit of the sensor for the presence of water in the fuel filter

Does not affect performance.

Water in fuel filter indicator does not work

Short to ground signal wire in wiring, sensor or connector

435

Emergency oil pressure sensor data is unreliable when the ignition is turned on

Does not affect performance.

The engine oil pressure protection does not work.

• - emergency oil pressure sensor.
• - Breakage of the signal wire of the emergency oil pressure sensor.
• - Electronic control unit.
• - Shorting the signal wire to power.

436

Intake manifold air temperature sensor data is unreliable when the ignition is switched on or the engine is running

The electronic control unit approximately calculates the air temperature in the intake manifold

• - Sensor readings are fixed in one range.
• - High resistance in the sensor circuit.

441

The power supply of the electronic control unit is below the minimum level

Engine may stall or be difficult to start

• - Battery.
• - Wiring and connectors.

442

The power supply of the electronic control unit is above the maximum level

Possible damage to all electrical components

• - Generator voltage regulator (recharge).
• - Batteries connected in series, not in series parallel.
• - Incorrect starting procedure with booster battery.

449

The electronic control unit has determined that the pressure in the fuel accumulator is higher than the normal fuel pressure

No effect or noise associated with increased injection pressure (especially at idle or under light load) or a decrease in power

Increased resistance in the drain line

451

Short to power supply of the fuel pressure sensor circuit

Power or speed reduced

• - Shorting the power wire to the signal wire.
• - Broken signal wire.
• - Broken power wire at 5 V.
• - Earth wire break.
• - fuel pressure sensor.
• - Electronic control unit.

452

Fuel pressure sensor circuit short to low voltage

Power or speed reduced

• - Power wire or signal wire shorted to ground.
• - Some component connected to the common supply wire is shorted to ground.
• - fuel pressure sensor.
• - Electronic control unit.

465

Turbocharger 1 wastegate circuit shorted to power

Reduce engine speed

• - Short to power.
• - An open in the turbocharger bypass valve circuit.

466

Turbo 1 wastegate circuit short to ground

Reduce engine speed

Shorting the signal wire to ground

471

The engine oil level sensor has detected a low engine oil level

The engine may be damaged. Possible low oil pressure and serious engine damage.

• - Low engine oil level after oil change.
• - Engine oil leaks on the ground.
• - Engine oil leaks into the fuel or cooling system.
• - High oil consumption.

477

Emission control system fluid injection controller supply below system supply voltage

Disabling injection of emission control fluid into the system

• - Incorrect battery voltage settings in INSITE.
• - Generator.
• - Battery.

478

Emission control system fluid injection controller supply higher than system supply voltage

Disabling injection of emission control fluid into the system

Incorrect battery voltage settings in INSITE

491

Turbocharger 2 bypass valve circuit shorted to power

Reduce engine speed

• - Short to power.
• - An open in the turbocharger bypass valve circuit.

492

Turbocharger 2 wastegate circuit short to ground

Reduce engine speed

Short to ground

498

Short to power in the engine oil level sensor circuit. Engine oil level sensor internal error detected.

Engine oil level sensor disabled

• - Break in the ground wire in the harness, connectors or sensor.
• - The signal wire is shorted to power.
• - Shorting the power wire to power

499

Short to low voltage circuit of the engine oil level sensor circuit. Engine oil level sensor internal error detected.

Engine oil level sensor disabled

• - Open or short circuit in the oil level sensor circuit.
• - oil level sensor.

545

The intake manifold pressure sensor reading exceeds the maximum limit for this engine mode

Power reduction

• - Valve for controlling the bypass of gases past the turbine.
• - Turbocharger.
• - Fuel system or turbocharging system.

553

The electronic control unit has determined that the pressure in the fuel accumulator is higher than the set value

No effect or noise associated with increased injection pressure (especially at idle or under light load). Power reduction.

High fuel pressure

554

The electronic control unit has determined that the fuel pressure sensor signal does not change

The electronic control unit approximately calculates the fuel pressure, power reduction

• - boost pressure sensor and air temperature sensor assembly.
• - camshaft position sensor.
• - fuel pressure sensor.
• - atmospheric pressure sensor.

555

Crankcase ventilation filter needs service

Does not affect performance

• - The crankcase ventilation filter needs to be replaced.
• - crankcase pressure sensor.
• - Clogged or narrowed separator breather with crankcase ventilation systems.
• - Clogged or narrowed breather drain tube or check valve of the crankcase ventilation system.
• - The crankcase ventilation outlet pipe is clogged or narrowed.
• - Frozen, blocked or narrowed tube of the crankcase ventilation system.

556

Crankcase ventilation filter needs service

Does not affect performance

• - The crankcase ventilation filter needs to be replaced.
• - crankcase pressure sensor.
• - The crankcase ventilation separator breather is clogged or narrowed.
• - Clogged or narrowed breather drain tube or check valve of the crankcase ventilation system.
• - The crankcase ventilation outlet pipe is clogged or narrowed.
• - Frozen, blocked or narrowed tube of the crankcase ventilation system.

559

The electronic control unit has determined that the pressure in the fuel accumulator is below the set value

Difficult starting or power loss possible, engine may not start.

Low fuel pressure

584

Short to power or open circuit of starter inhibit relay

engine will not start or starter protection is disabled

• - Broken wire or connector.
• - Short to power.

585

Short to low voltage circuit of the starter inhibit relay

Disabled starter protection against accidental activation

Short to ground

596

High battery voltage detected during battery voltage test

When the voltage is high, the orange warning light and the CHECK ENGINE indicator will be on

Overcharging due to alternator or battery failure

597

Low battery voltage detected during battery voltage test

When the voltage is low, the CHECK ENGINE warning light will be orange

• - Overcharging due to a malfunction of the generator or battery.
• - Consumers of high current electricity (radio amplifier, parking lights, etc.).

598

Very low battery voltage detected during battery voltage test

If the voltage is very low, the red STOP ENGINE warning light will be on

Overcharging due to alternator or battery failure

649

Time to change engine oil and filter

Maintenance reminder only

Time to change engine oil and filter

Cummins ISF3.8 fault code table continued in the article - Table continued Trouble Code Cummins ISF3.8