With Generic Scan Tool

Glow Plug System, Checking

Vehicles of model year 2002 >

NOTE: Vehicles of model year 2002 up, are equipped with Control module for glow plug triggering -J370- in which the glow plug activation cannot be perceived visually or acoustically and can only be detected by connecting a current-pick up clamp at wires to the glow plugs.

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter

Test 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, for example, lights and rear window defroster must be switched off.
- If vehicle is equipped with an A/C system, it must be switched off.
- Engine must be cold

Test sequence

NOTE: Test must be performed within 3 minutes after engine start.

- Start engine and let run at idle.
- Connect V.A.G 1715 multimeter with current probe in succession to wires to glow plugs.
- Specified value on display of V.A.G 1715 at least 6 A.

If specified value is obtained:
- Eliminate error in wires according to wiring diagram.
- Erase DTC memory of control module for Diesel- Direct fuel injection system, Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes