Part 2 of 3

Chart A-3 (Part 2 Of 3):

Chart A-3 Wiring Diagram:

TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. Checks for 12 volt supply to injectors. Due to the injectors wired in parallel there should be a light "ON" on both terminals.

2. Checks continuity of CKT 467.

3. All checks made to this point would indicate that the ECM is at fault. However, there is a possibility of CKT 467 being shorted to a voltage source either in the engine harness or in the mini harness.

To test for this condition:

^ Disconnect black mini harness connector.

^ Ignition "ON". Probe CKTs 467 and 468 on the ECM side of harness with a test light connected to ground. There should be no light. If light is "ON", repair short to voltage.

^ If OK, check the resistance of the injector harness between terminals "A" & "F".

^ Should be 4 to 5 ohms.

^ If less than 4 ohms, check harness for wires shorted together and check each injector resistance. There should be no continuity between terminals "A" & "F". If there is continuity, check harness for wires shorted together.

^ Resistance of each injector should be 12.2 ohms +/- 0.2 ohms (at ambient temperature). Injector resistance will increase with temperature and could read as high as 14.4 ohms at 93~C.

^ If all OK, replace ECM