1995 Nissan Quest Q&A
1995 Nissan Quest Question: I need to remove and replace my ECU.
The larger unit is the ECU and the smaller is the TCU(Transmision Control Unit) You have to use 10mm socket to remove them(same bolts holds both unit together). First remove negative battery cable to avoid damage in units. - euromech
why are doing this repair?? it is the last thing you would do when doing a diag. very expensive guess. Roy - mastertech6371
Before removing the ECU its best to test each wire at the computer looking at a pin out chart to see if the signal is supposed to be power, ground, pulsed sine wave or hall effect signal, you look for voltage drop on the signals or no signal at all. Roy is right check the MIL light bulb first the ECU grounds the bulb to light it. Your car has a OBD2 diagnostics so a good scan tool should test a lot without having to intrusively test each sensor value. If it is the computer a company called Fuel Injection Corporation in Livermore California can test the computer for you they are very good. - patrick mannion