1. Turn the ignition switch ON (II).

1. Do the gauge self-diagnostic procedure.

Does the glow plug indicator flash?

YES | - | Go to Step 3 .
NO | - | Substitute a known-good gauge assembly, and recheck. If the glow plug indicator circuit is OK, replace the original gauge assembly.■

1. Turn the ignition switch OFF.

1. Turn the ignition switch ON (II), and watch the glow plug indicator.

Does the glow plug indicator stay off?

YES | - | Go to Step 7 .
NO | - | Go to Step 5 .

1. Turn the ignition switch OFF.

1. Turn the ignition switch ON (II), and watch the glow plug indicator.

Does the glow plug indicator stay on?

YES | - | Go to Step 12 .
NO | - | The glow plug indicator circuit is OK.■

1. Try to start the engine.

Does the engine start?

YES | - | Go to Step 8 .
NO | - | Go to Step 16 .

1. Turn the ignition switch OFF, and wait 30 seconds.

1. Disconnect the gauge control module 36P connector.

1. Disconnect ECM connector No. 2 (58P).

1. Check for continuity between ECM connector No. 2 terminal No. 33 and gauge control module 36P connector terminal No. 28.

Is there continuity?

YES | - | Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■
NO | - | Repair open in the wire between the gauge assembly and ECM connector No. 2 terminal No. 33.■

1. Turn the ignition switch OFF, and wait 30 seconds.

1. Disconnect the gauge control module 36P connector.

1. Disconnect ECM connector No. 2 (58P).