TL V6-3.2L (2004)
Malfunction Indicator Lamp: Testing and Inspection
MIL Circuit Troubleshooting
1. Turn the ignition switch ON (II).
2. Do the gauge self-diagnostic function.
Does the MIL indicator flash?
YES - Go to step 3.
NO - Substitute a known-good gauge control module, and recheck. If the MIL circuit is OK, replace the original gauge control module.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON (II), and watch the MIL.
Does the MIL stay off?
YES - Go to step 17.
NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Turn the ignition switch ON (II), wait 20 seconds, and watch the MIL.
Does the MIL stay on or flash more than 5 times?
YES - Go to step 7.
NO - The MIL circuit is OK.
7. Turn the ignition switch OFF.
8. Connect the HDS.
9. Turn the ignition switch ON (II), and read the HDS.
Does the HDS communicate with the ECM/PCM?
YES - Go to step 10.
NO - Go to "DLC Circuit Troubleshooting". If no problem is found in the DLC troubleshooting, go to step 21.
10. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - Go to the indicated DTC's troubleshooting.
NO - Go to step 11.
11. Check the MIL in the DATA LIST with the HDS.
Does it indicate ON?
YES - Go to step 12.
NO - Substitute a known-good gauge control module, and recheck. If the MIL circuit is OK, replace the original gauge control module.
12. Check the SCS in the DATA LIST with the HDS.
Is a short indicated?
YES - Go to step 13.
NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the
symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
