Introduction - Start Here

SYMPTOM DIAGNOSIS
If the self-diagnosis "D4" indicator light does not blink, perform an inspection according to the table below.
- If a customer describes the symptoms for codes 3, (yet the "D4" indicator light is not blinking), 6, 11 or 15, it will be necessary to recreate the symptom by test driving, and then checking the "D4" indicator light with the ignition still ON.
- If the "D4" indicator light displays codes other than those listed above, the Transmission Control Module (TCM) is faulty.
- Sometimes the "D4" indicator light and the Malfunction Indicator Lamp (MIL)/Check Engine light may come on simultaneously. If so, check the PGM-FI system according to the number of blinks on the MIL/Check Engine light, then reset the memory by removing the BACK UP fuse in the under-hood fuse/relay box for more than 10 seconds. Drive the vehicle for several minutes at speed over 30 mph (50 km/h), then recheck the MIL/Check Engine light.

NOTE: Disconnecting the BACK UP fuse also cancels the radio anti-theft code, preset stations and the clock setting. Get the customer's code number and make note of the radio presets before removing the fuse so you can reset them.