MIL Circuit Troubleshooting (2016-18)

Gauge control module check:
- 1. Press the engine start/stop button to select the ON mode.

- 2. Do the gauge 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 .?

PCM check:

- 1. Press the engine start/stop button to select the OFF mode.

- 2. Connect the HDS to the DLC.

- 3. Press the engine start/stop button to select 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.

Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM .?

Shorted wire check (SCS line):

- 1. Press the engine start/stop button to select the OFF 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 (51P)

- 4. Disconnect the HDS.

- 5. Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector A (51P): disconnected
Test point 1	PCM connector A (51P) No. 39
Test point 2	Body ground

Is there continuity?

YES

Repair a short in the SCS wire between the PCM (A39) and the DLC.?

The SCS wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM .?