Test sequence
- Disconnect glow plug connector from glow plug.
- Connect voltage tester using auxiliary clips from auxiliary cable set to battery positive (B+).
- Place voltage tester probe on each glow plug one after another.
Diode lights up: glow plug OK
Diode does not light up: replace glow plug.
- Remove and install glow plugs with Hinged socket 3220.
Tightening torque: 15 Nm (11 ft lb).