VW Golf V - Poor engine starting performance | HELLA
VW
Golf V
1.9D TDI PD
Engine code: BKC
Poor engine starting performance.
Engine is operating in emergency mode.
If the fault pattern listed above is reported, the cause may be a defective coolant temperature sensor. In addition, error codes (triggered by implausible sensor values) may be stored in the engine control unit.
Error code 'equivalent' to:
- P1556, 'Charge pressure control negative'.
In addition, with the potentially misleading turbocharger pressure error code (P1556), excessive engine knocking while idling could be indicative of a faulty sensor.
In this case, proceed as follows:
- Disconnect wire harness multi-plug from the engine control unit and the coolant temperature sensor and perform a continuity test.
- Check the contacts on both sides for corrosion and mechanical damage and repair them if necessary.
- Check the ground connections.
- Check that coolant temperature sensor is functioning properly. As guidelines, the specified resistance value should be _ 2080 Ω at 25°C and _ 289 Ω at 85°C respectively.
Replace the sensor if necessary (see Figure 1.).
Hella coolant temperature sensor: 6PT009309-331
Then clear the entries present in the error memory.
Figure 1.