When the D4 light blinks, it indicates an error has been detected by the transmission control module (TCM) and you need to retrieve the trouble code to find out what is wrong. It could result in erratic shifting and performance issues.
TCM Fault Codes
1. With ignition off, install jumper wire between terminals on service check connector. Service check connector is a 2-pin Blue connector, located at lower passenger's corner of glove box, near kick panel. See Fig. 14 and Fig. 15. This will place TCM in self-diagnostic mode.
2. Turn ignition on. Fault codes will be displayed by blinking "D4" light on A/T gear position indicator on instrument panel.
3. Fault codes will be displayed by short and long blinks. One long blink equals 10 short blinks. For example, if a long blink is followed by 4 short blinks, this indicates Fault Code No. 14. See Fig. 16.
4. Once a fault code is obtained, determine probable cause and symptom. If any other fault codes except those listed are displayed, TCM is defective. Turn ignition off. Remove jumper wire or SCS service connector from service check connector.
If customer describes symptoms for Fault Code No. 3 and "D4" light is off or Fault Code No. 6, 11, it may be necessary to test drive vehicle to recreate the symptom and then check for trouble code with ignition still on.
Images (Click to enlarge)
Sunday, January 2nd, 2011 AT 5:30 AM