Circuit Description
When the ignition is turned ON, the malfunction indicator lamp (MIL) will momentarily flash ON then OFF and remain ON until the engine is running, if no diagnostic trouble codes (DTCs) are stored. The powertrain control module (PCM) controls the MIL by providing a ground path through the MIL control circuit to turn ON the MIL.
Test Description
The number(s) below refer(s) to the step number(s) on the Diagnostic Table.
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The Powertrain OBD System Check prompts you to complete some of the basic checks and to store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data captured when the fault occurred. The scan tool stores this information for later reference.
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When the ignition is turned ON, the MIL should momentarily flash ON and OFF, then remain ON until the engine is running or if an emission related DTC stores.
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This step checks the ability of the PCM to control the MIL. The scan tool has the ability to command the MIL ON and OFF.
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A shorted MIL circuit can be diagnosed with a scan tool. Refer to Powertrain Control Module Outputs Diagnosis .
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For Instrument Panel Cluster (IPC) replacement procedures, refer to Instrument Panel and Console of the service manual.
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Reprogram the PCM and perform the crankshaft position system variation learning procedure. Refer to the latest Techline information for PCM programming and Powertrain Control Module (PCM) for the Crankshaft Position System Variation Learning Procedure.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | |||
Turn ON the ignition leaving the engine OFF. Is the MIL ON? | -- | |||
Does the MIL turn ON and OFF when commanded? | -- | |||
4 |
Is the MIL OFF? | -- | ||
Check the MIL control circuit for a short to ground and repair the circuit if necessary. Was a repair necessary? | -- | |||
Replace the Instrument Panel Cluster (IPC). Is the action complete? | -- | -- | ||
Replace the PCM. Is the action complete? | -- | -- | ||
8 |
Does the engine start and continue to run? | -- | ||
9 |
Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to the applicable DTC table | System OK |
