MIL Circuit Troubleshooting

MIL Circuit Troubleshooting

ElectronicCircuitSchematics-button

MIL Circuit Troubleshooting

1- Gauge control module check:

Gauge control module check

1- Turn the vehicle to the ON mode- 2- Do the gauge control module self-diagnostic function- Does the MIL flash

YES

Go to step 2-

NO

Substitute a known-good gauge control module, then recheck. If the symptom/indication goes away with a known-good gauge control module, replace the original gauge control module.

2- PCM check:

PCM check

1- Turn the vehicle to the OFF (LOCK) mode- 2- Connect the HDS to the data link connector- 3- Turn the vehicle to the ON mode- 4- Check the parameter(s) below with the HDS- Signal

Threshold

Current conditions

Values

Unit

Values

Unit

SCS

Short

Do the current condition(s) match the threshold

YES

Go to step 3-

NO

Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM.

3- Shorted wire check (SCS line):

Shorted wire check (SCS line)

1- Turn the vehicle to the OFF (LOCK) mode- 2- Jump the SCS line with the HDS, and wait more than 1 minute- SCS Short

3- Disconnect the following connector- PCM connector A (50P)

4- Disconnect the HDS from the data link connector- 5- Check for continuity between test points 1 and 2- Test condition

Vehicle OFF (LOCK) mode

PCM connector A (50P): disconnected

Test point 1

PCM connector A (50P) No. 27

Test point 2

Body ground

Is there continuity

YES

Repair a short in the SCS wire between the PCM (A27) and the data link connector.

NO

The SCS wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM.

Troubleshooting Start
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