Intermittent fault
Check the control module connector and the electrical terminal for the glow plug. Check for loose connections. See Loose connections (terminals) . Check for contact resistance and oxidation. See Contact resistance and oxidation .
Check the cable between control module terminal #1 and the glow plug terminal. Check for an intermittent open-circuit. Check for an intermittent short-circuit to ground. Check for an intermittent short-circuit to supply voltage.
Remedy as necessary.
Other information:
- To access the control module or connect the breakout box, see Connecting the breakout box
- To access the glow plug, For cars manufactured up to w38 2001 inclusive, see Glow plugs, engine coolant heater, replacing For cars manufactured from w39 2001 inclusive, see Replacing the glow plugs of the engine coolant heater
- With the ignition on and the glow plug electrical terminal disconnected, the voltage between the glow plug electrical terminal (control module side) and ground must be approximately 9 V
- For other values, see Signal specification
- See Checking wiring and terminals .
- Continue
Refer to Information
OKAY: Troubleshooting has been completed.