With Generic Scan Tool

Glow plug system, checking

Only vehicles of model year up to 2001

Special tools and equipment

- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirements:






- The respective fuses of Diesel-Direct fuel injection system must be OK.
- The battery voltage must be at least 11.5 V.
- Ignition switched off.

Test sequence

Vehicles with 80-pin control module





- Disconnect 4 pin connector from Engine Coolant Temperature Sensor -G62- with Engine Coolant Temperature Gauge Sensor -G2- (arrow).

Vehicles with 121-pin control module





- Disconnect connector at coolant temperature sensor

Continuation for all vehicles

Note: By disconnecting the connector from the sensor, a "cold" engine 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
- Connect VAG1715 multimeter in succession between glow plug connector cylinder 1 and vehicle Ground (GND) as well as between glow plug connector cylinder 3 and vehicle Ground (GND) for voltage measurement.
- Specified value: Battery voltage for approx. 20 seconds
- If there is no voltage:
- Eliminate error in wires according to wiring diagram
- Erase DTC memory of control module for Diesel-Direct fuel injection system, refer to "Diagnostic Trouble Code (DTC) Memory, Checking and Erasing" Testing and Inspection
- Generate readiness code.