Turn the ignition switch ON (II). 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.■
Turn the ignition switch OFF. 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 .
Turn the ignition switch OFF. 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.■
Try to start the engine. Does the engine start?
YES | - | Go to Step 8 .
NO | - | Go to Step 16 .
Turn the ignition switch OFF, and wait 30 seconds. Disconnect the gauge control module 36P connector. Disconnect ECM connector No. 2 (58P). 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.■
Turn the ignition switch OFF, and wait 30 seconds. Disconnect the gauge control module 36P connector. Disconnect ECM connector No. 2 (58P). |