Circuit Description
When the ignition is turned ON, the malfunction indicator lamp (MIL) will be turned ON and remain ON until the engine is running, if no diagnostic trouble codes (DTCs) are stored. Battery voltage is supplied through the ignition switch directly to the MIL telltale. The engine control module (ECM) controls the MIL by providing a ground path through the MIL control circuit to turn ON the MIL.
Diagnostic Aids
An open ignition fuse F4 will cause the entire cluster to be inoperative.
Inspect the battery and ignition feed circuits for poor connections if the MIL is intermittent.
Any circuitry that is suspected as causing an intermittent complaint should be thoroughly inspected for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wiring connections, or physical damage to the wiring harness.
Step | Action | Yes | No |
|---|---|---|---|
1 | Attempt to start the engine. Does the engine start? | Go to Step 2 | |
2 |
Does the test light illuminate? | Go to Step 3 | Go to Step 6 |
3 | Inspect the terminals for damage or a poor connection. Is a repair necessary? | Go to Step 5 | Go to Step 4 |
4 | Replace the ECM. Refer to Engine Control Module Replacement . Did you complete the replacement? | -- | |
5 | Repair any damaged terminals or poor connection. Did you complete the repair? | -- | |
6 | Inspect the fuse F4. Is the fuse open? | Go to Step 7 | Go to Step 8 |
7 |
Did you complete the repair? | -- | |
8 |
Did you find and correct the condition? | -- |
