Glow Plug Indicator Circuit Troubleshooting

1.Turn the ignition switch ON (II).

2.Do the gauge self-diagnostic procedure.

Does the glow plug indicator flash?


YES - Go to 3.


NO - Substitute a known-good gauge assembly, and recheck. If the glow plug indicator circuit is OK, replace the original gauge assembly.n


3.Turn the ignition switch OFF.

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

Does the glow plug indicator stay off?


YES - Go to 7.


NO - Go to 5.


5.Turn the ignition switch OFF.

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

Does the glow plug indicator stay on?


YES - Go to 12.


NO - The glow plug indicator circuit is OK.n


7.Try to start the engine.

Does the engine start?


YES - Go to 8.


NO - Go to 16.


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

9.Disconnect the gauge assembly 22P connector.

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

11.Check for continuity between ECM connector No. 2 terminal No. 33 and gauge assembly 22P connector terminal No. 5.

 

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.n


NO - Repair open in the wire between the gauge assembly and ECM connector No. 2 terminal No. 33.n

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

13.Disconnect the gauge assembly 22P connector.

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

15.Check for continuity between ECM connector No. 2 terminal No. 33 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the gauge assembly and ECM connector No. 2 terminal No. 33.n


NO - 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.n

16.Press the inertia switch button.

17.Try to start the engine.

Does the engine start?


YES - Troubleshooting is complete.n


NO - Go to 18.


18.Check PGM-FI main relay 1.

Is PGM-FI main relay 1 OK?


YES - Go to 19.


NO - Replace  PGM-FI main relay 1.n


19.Inspect the No. 26 +B IGP (20 A) fuse in the under-hood fuse/relay box.

Is the fuse OK?


YES - Go to 26.


NO - Go to 20.

20.Disconnect PGM-FI main relay 1.

21.Check for continuity between body ground and PGM-FI main relay 1 4P connector terminals No. 2 and No. 4 individually.

 

Is there continuity?


YES - Repair short in the wire between PGM-FI main relay 1 and the No. 26 +B IGP (20 A) fuse. Also replace the No. 26 +B IGP (20 A) fuse.n


NO - Go to 22.

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

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

24.Disconnect the fuel rail pressure control valve 2P connector.

25.Check for continuity between PGM-FI main relay 1 4P connector terminal No. 1 and body ground.

 

Is there continuity?


YES - Repair short in the wire between PGM-FI main relay 1, fuel rail pressure control valve and ECM connector No. 2 terminal No. 1, No. 3 or No. 5. Also replace the No. 26 +B IGP (20 A) fuse.n


NO - 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.n

26.Turn the ignition switch OFF.

27.Disconnect PGM-FI main relay 1.

28.Measure voltage between body ground and PGM-FI main relay 1 4P connector terminals No. 2 and No. 4 individually.

 

Is there battery voltage?


YES - Go to 29.


NO - Repair open in the wire between PGM-FI main relay 1 and the No. 26 +B IGP (20 A) fuse.n


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

30.Connect PGM-FI main relay 1 4P connector terminal No. 3 to body ground with a jumper wire.

 

31.Check for continuity between ECM connector No. 2 terminal No. 19 and body ground.

 

Is there continuity?


YES - Go to 35.


NO - Go to 32.


32.Disconnect the inertia switch 3P connector.

33.Connect inertia switch 3P connector terminals No. 1 and No. 3 with a jumper wire.

 

34.Check for continuity between ECM connector No. 2 terminal No. 19 and body ground.

 

Is there continuity?


YES - Replace the  inertia switch.n


NO - Repair open in the wire between PGM-FI main relay 1 and ECM connector No. 2 terminal No. 19.n


35.Measure voltage between ECM connector No. 2 terminal No. 35 and body ground.

 

Is there battery voltage?


YES - Go to 37.


NO - Go to 36.

36.Inspect the No. 4 ACG (10 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?


YES - Repair open in the wire between the No. 4 ACG (10 A) fuse and ECM connector No. 2 terminal No. 1.n


NO - Repair short in the wire between the No. 4 ACG (10 A) fuse and ECM connector No. 2 terminal No. 1.n


37.Check for continuity between PGM-FI main relay 1 4P connector terminal No. 1 and ECM connector No. 2 terminals No. 1, No. 3, and No. 5 individually.

 

Is there continuity?


YES - Go to 38.


NO - Repair open in the wire between PGM-FI main relay 1 and ECM connector No. 2 terminal No. 1, No. 3 or No. 5.n

38.Check for continuity between body ground and ECM connector No. 2 terminals No. 2, No. 4, and No. 6 individually.

 

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.n


NO - Repair open in the wire between PGM-FI main relay 1 and ECM connector No. 2 terminal No. 2, No. 4 or No. 6.n