In this article, we will look at fault codes, their causes and how to fix them.
The code table was covered in the article «Petrol engine diagnostic fault codes».
To diagnose the vehicle's ECU, it is necessary to turn on the «ignition» in diagnostic mode (forced application of «+» after the ignition switch).
To do this:
- Insert the vehicle card into the reader (depending on the specification: without key, scenario 1 (base specification without «hands-free» function) and scenario 2 (maximum specification with «hands-free» function)).
- press and hold (for more than 5 seconds) the engine start button without the starting conditions being met;
- connect the diagnostic tool and perform the necessary operations.
Power is supplied to the left and right xenon headlamp ECUs when the dipped beam is switched on.
Therefore, they can only be diagnosed after switching on the ignition in diagnostic mode (forced application of «+» after the ignition switch) and switching on the dipped beam.
To turn off the «+» supply after the ignition switch, proceed as follows:
- disconnect the diagnostic tool;
- briefly press the engine start button twice (for less than 3 seconds);
- verify that the forced «+» supply after the ignition switch has been stopped by checking that the ECU warning lamps on the instrument panel go out.
DF001 Coolant temperature sensor circuit
Check the cleanliness and condition of the coolant temperature sensor and its connector.
Disconnect the battery and the injection system ECU.
Check the cleanliness of the contacts and the condition of the connector.
Connect a universal contact board and check for open circuits and short circuits in the following circuits:
- ECU contact F2, connector B → Coolant temperature sensor;
- ECU contact F4, connector B → Coolant temperature sensor (see the connector contact numbers in the corresponding wiring diagram).
Check the resistance of the coolant temperature sensor.
If the values do not match, replace the coolant temperature sensor.
If the fault persists, process other faults, then proceed to conformity checking.
After clearing the fault, erase the fault information from the memory.
DF049 Refrigerant pressure sensor circuit
Cause: voltage out of tolerance.
Check the cleanliness and condition of the absolute pressure sensor and its connector.
Disconnect the battery and the injection system ECU.
Check the cleanliness of the contacts and the condition of the connector.
Connect a universal contact board in place of the ECU and check for open circuits and short circuits in the following circuits:
- ECU, contact J2 of connector B → Refrigerant pressure sensor;
- ECU, contact J3 of connector B → Refrigerant pressure sensor;
- ECU, contact K2 of connector B → Refrigerant pressure sensor.
(see the connector contact numbers in the corresponding wiring diagram).
If fault DF012 is present or stored, process this fault.
If the fault persists, process other faults, then proceed to conformity checking.
Engine component resistance tables
Electrical resistance of K4J engine components
Ambient temperature ~ 20 °C:
- Injectors: 14.5 Ω ±5%
- Throttle actuator motor: 1.6 Ω ±10%
- Canister purge solenoid valve: 25 Ω ±20%
Pencil-type ignition coils
- Primary winding: 0.5 Ω ±5%
- Secondary winding: 10.7 kΩ ±15%
- Crankshaft position and speed sensor: 230 Ω ±20%
- Upstream oxygen sensor heater: 9 Ω ±10%
- Downstream oxygen sensor heater: 9 Ω ±10%
Electrical resistance of K4M engine components
Ambient temperature ~ 20 °C:
- Injectors: 14.5 Ω ±5%
- Throttle actuator motor: 2.2 Ω ±10%
- Canister purge solenoid valve: 25 Ω ±20%
- Camshaft phaser solenoid valve: 7.2 Ω ±10%
Pencil-type ignition coils
- Primary winding: 0.5 Ω ±5%
- Secondary winding: 10.7 kΩ ±15%
- Crankshaft position and speed sensor: 230 Ω ±20%
- Upstream oxygen sensor heater: 9 Ω ±10%
- Downstream oxygen sensor heater: 9 Ω ±10%
Electrical resistance of F4R engine components
Ambient temperature ~ 20 °C:
- Injectors: 14.5 Ω ±5%
- Throttle actuator motor: 2.3 Ω ±10%
- Canister purge solenoid valve: 25 Ω ±20%
- Camshaft phaser solenoid valve: 7.2 Ω ±10%
Pencil-type ignition coils:
- Primary winding: 0.5 Ω ±5%
- Secondary winding: 10.7 kΩ ±15%
- Crankshaft position and speed sensor: 230 Ω ±20%
- Upstream oxygen sensor heater: 9 Ω ±10%
- Downstream oxygen sensor heater: 9 Ω ±10%
