Pinpoint Test M: The Malfunction Indicator Lamp (MIL) Is Never/Always On

Instrumentation and Warning Chimes

Pinpoint Tests

Pinpoint Test M: The Malfunction Indicator Lamp (MIL) Is Never/Always On

Normal Operation

The Instrument Cluster (IC) receives the MIL status from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. When a fault condition exists in the PCM, a DTC is set in the PCM and a message is sent to the IC to illuminate the MIL. The IC sets a continuous DTC if the PCM data is missing for more than 5 seconds or if invalid data is received and the IC turns on the MIL.

This pinpoint test is intended to diagnose the following:

- PCM
- IC



PINPOINT TEST M: THE MALFUNCTION INDICATOR LAMP (MIL) IS NEVER/ALWAYS ON

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M1 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST


- Retrieve the recorded DTCs from the PCM Key ON Engine OFF (KOEO) self-test.
- Are any DTCs retrieved?

Yes
REFER to the Computers and Control Systems Information.

No
GO to M2.

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M2 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Retrieve the recorded DTCs from the IC self-test.
- Is DTC U0100 retrieved?

Yes
Go To Pinpoint Test AK. Pinpoint Tests AK: DTC U0100

No
GO to M3.

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M3 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC MIL indicator (MIL_IC) active command. Command the MIL indicator on then off again. Observe the MIL warning indicator.
- Does the MIL warning indicator illuminate when commanded on and turn off when commanded off?

Yes
INSTALL a new PCM. TEST the system for normal operation.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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