Glow Plug System: Testing and Inspection

Special Tools, Testers And Auxiliary Items:
- Fluke 83 multimeter (or equivalent)
- VW 1594 adaptor kit

Test Requirements:
- Battery voltage 11.5 Volts minimum
- Ignition switched OFF
- Diesel Engine Control Module J248 OK
- Glow plug fuse S125 OK

NOTE: Production number "180" must appear on the reverse side of the glow plug relay.

Test Procedure:




- Disconnect Engine Coolant Temperature sensor -1- harness connector

NOTE: A "cold" engine condition is simulated when the G62 harness connector is disconnected and then the ignition is switched ON for the appropriate glow period.

- Disconnect glow plug harness connector
- Switch ON ignition
- Switch Fluke 83 multimeter to 20 Volt range
- Connect multimeter between cyl. 1 glow plug connector and vehicle Ground and between cyl. 3 glow plug connector and Ground using jumper wires from VW 1594 adaptor kit
Specification: Battery voltage for approx. 20 secs

If no voltage exists:
- Troubleshoot system using wiring diagrams
- Erase DTC memory and re-create readiness code