Test sequence
Vehicles with 80-pin control module
- Disconnect 4-pin connector from Engine Coolant Temperature (ECT) Sensor -G62- with Engine Coolant Temperature (ECT) Sensor -G2- (arrow).
Vehicles with 121-pin control module
- Disconnect connector at coolant temperature sensor.
Vehicles with 154-pin control module
- Disconnect connector at coolant temperature sensor.
Continue for all vehicles
NOTE:
By disconnecting the connector from the sensor, a "cold" engine state is simulated and a corresponding glow plug procedure is performed when ignition is switched on.
- Disconnect glow plug connectors from glow plugs.
- Switch on ignition.
Vehicles with engine code ALH
- Connect V.A.G 1526 hand multimeter in succession between glow plug connector cylinder 1 and vehicle Ground (GND) as well as between glow plug connector cylinder 3 and vehicle GND for voltage measurement.
- Specified value:
Battery voltage for approx. 20 s.
Vehicles with engine code BEW
- Connect V.A.G 1526 portable multimeter in succession between glow plug connectors and vehicle Ground (GND) for voltage measurement.
- Specified value:
Battery voltage for approx. 20 s.
Continue for all vehicles
- If there is no voltage:
- Eliminate error in wires (see circuit diagram):
Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations
- Erase DTC memory of control module for Diesel-Direct fuel injection system. Refer to Diagnostic mode 4: Reset/erase diagnostic data .
- Generate readiness code.