Glow Plug System, Checking - I

Glow Plug System, Checking

Recommended Special Tools And Equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram

Requirements







- The respective fuses of Diesel-Direct fuel injection system must be OK:
- Battery voltage must be at least 11.5 volts.
- All electrical consumers such as, lights and rear window defroster must be switched off.
- For vehicles with automatic transmission, selector lever must be in position -P- or -N-.
- Parking brake must be engaged.
- If vehicle is equipped with an A/C system, it must be switched off.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition is switched off.

Test sequence







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

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 connector from ceramic sheathed element glow plugs.
- Switch on ignition.
- 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.

If there is no voltage:
- Eliminate error in wires (see circuit diagram):
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes