Troubleshooting

Illustration 26 g03770598
Schematic diagram for the glow plug starting aid circuit
Not all connectors are shown. Refer to the Electrical Schematic for the application.
Illustration 27 g02671559
View of the pin locations on the P1 connector for the
Glow Plug Control unit (GCU)
(22) GCU diagnostic return
(52) GCU control signal
(41) GCU ground
Illustration 28 g02674096
View of the pin locations on the GCU
(1) Glow plug cylinder 3
(2) Glow plug cylinder 1
(3) GCU diagnostic return
(4) Battery +
(5) GCU ground
(6) Glow plug cylinder 4
(7) Glow plug cylinder 2
(8) Glow plug control
Glow Plug Starting Aid Override
UENR0612-07 135
Circuit Tests
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