Let us start by retrieving the trouble code for the D4 blinking and see if it is just sensors or a fault with the TCM.
Bridge the SCS connector and turn ignition switch ON and count the blinking of the D4 light. Note them down and let me know what you have.
Do this after the D4 blinks and do not disconnect the battery, it would clear the codes.
Tuesday, June 2nd, 2009 AT 7:35 AM