Malfunction Indicator Lamp (MIL) Inoperative Non European Emissions
Circuit Description
There should always be a steady malfunction indicator lamp (MIL) when the ignition is ON and the engine is stopped. Battery voltage is supplied directly to the MIL bulb. The electronic control module (ECM) will control the MIL lamp and turn it ON by providing a ground path through the ECM connector terminal B10 wire to the MIL lamp.
Diagnostic Aids
| • | If the engine runs OK, inspect for a faulty malfunction indicator lamp bulb. |
| • | If the engine cranks but will not start, inspect for open fuses and poor ECM connections. Particularly inspect for ECM ignition and battery feeds, including clean and tight ECM ground connections. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Start the engine. Does the engine start? | -- | Go to Step 2 | Go to Step 7 |
2 |
Is the malfunction indicator lamp (MIL) ON? | -- | Go to Step 13 | Go to Step 3 |
3 | Inspect the kick panel fuse F16. Is the fuse OK? | -- | Go to Step 4 | Go to Step 14 |
4 | Inspect the ignition feed to the MIL bulb using a voltmeter. Is the voltage within the value specified? | 11-14 V | Go to Step 5 | Go to Step 15 |
5 | Inspect the MIL bulb. Is the MIL bulb OK? | -- | Go to Step 6 | Go to Step 16 |
6 | Inspect for an open or short to voltage in the wire between the ECM connector terminal B10 and the MIL bulb. Did you find the condition? | -- | Go to Step 17 | Go to Step 12 |
7 | Inspect the ECM fuse F15. Did you find the condition? | -- | Go to Step 18 | Go to Step 8 |
8 |
Is the test light ON? | -- | Go to Step 9 | Go to Step 19 |
9 |
Is the test light ON? | -- | Go to Step 10 | Go to Step 20 |
10 | Inspect the ECM connector terminals A6 and C16 for damage or poor mating. Did you find the condition? | -- | Go to Step 11 | Go to Step 13 |
11 | Repair the ECM connector terminals as needed. Did you complete the repair? | -- | -- | |
12 | Inspect for damage or poor mating at the ECM connector terminal B10. Did you find the condition? | -- | Go to Step 11 | Go to Step 13 |
13 | Inspect the ECM connector terminals B1 and D16 for ground. Are the grounds OK? | -- | Go to Step 22 | Go to Step 21 |
14 |
Is the MIL lamp ON? | -- | Go to Step 4 | |
15 | Repair the open in the ignition feed wire to the MIL bulb. Did you complete the repair? | -- | -- | |
16 | Replace the MIL bulb. Did you complete the repair? | -- | -- | |
17 | Repair the wire between the ECM connector terminal B10 and the MIL bulb. Did you complete the repair? | -- | -- | |
18 |
Is the MIL lamp ON? | -- | Go to Step 1 | |
19 | Repair the wire between the ECM connector terminal A6 and the battery. Did you complete the repair? | -- | -- | |
20 | Repair the wire between the ECM connector terminal C16 and the battery. Did you complete the repair? | -- | -- | |
21 | Repair the open wire between the ECM connector terminals B1 and/or D16 and ground. Did you complete the repair? | -- | -- | |
22 | Replace the electronic control module (ECM). Refer to Engine Control Module Replacement . Did you complete the repair? | -- | -- |
Malfunction Indicator Lamp (MIL) Inoperative European Emissions
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 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 F12 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-wire 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 poor connections. Is any problem found? | Go to Step 5 | Go to Step 4 |
4 | Replace the ECM. Refer to Engine Control Module Replacement . Is the replacement complete? | -- | |
5 | Repair any damaged terminals or poor connections. Is the repair complete? | -- | |
6 | Inspect the fuse F16. Is the fuse open? | Go to Step 7 | Go to Step 8 |
7 |
Is the repair or replacement complete? | -- | |
8 |
Is the repair or replacement complete? | -- |
