Diagnostic Aids

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The main relay will remain powered up for 15 seconds after the ignition switch is turned OFF.
The powertrain relay system diagnosis table assumes that the vehicle battery is fully charged. Refer to Battery Inspection/Test in Engine Electrical.

Powertrain Relay Diagnosis

Step	Action	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Are DTCs P0686, P0687, P0689 or P0690 set?	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information	Go to Step 3
3	Turn ON the ignition, with the engine OFF. Remove the underhood fuse block cover. Probe the following fuses with a test lamp that is connected to a good ground. Refer to Troubleshooting with a Test Lamp in Wiring Systems. V8 ECM fuse Post O2 fuse ODD coils fuse EVEN coils fuse Pre O2/CAM Fuse Does the test lamp illuminate on at least one test point of each fuse?	Go to Step 6	Go to Step 4
4	Turn OFF the ignition. Remove the powertrain relay from the underhood junction block with theJ 43244 Relay Puller Pliers. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems. Connect a 20-amp fused jumper wire from the battery positive voltage terminal for the powertrain relay armature at the underhood fuse block to the relay load circuit terminal at the underhood fuse block. Refer to Using Fused Jumper Wires in Wiring Systems. Probe the following fuses with a test lamp that is connected to a good ground: V8 ECM fuse Post O2 fuse ODD coils fuse EVEN coils fuse Pre O2/CAM Fuse Does the test lamp illuminate on at least one test point of each fuse?	Go to Intermittent Conditions	Go to Step 5
5	Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems. Did you complete the replacement?	Go to Step 6	-
6	Replace any open fuses. Turn OFF the ignition for 30 seconds. Attempt to start the engine. Does the engine start and run?	Go to Step 7	Go to Intermittent Conditions
7	Clear the DTCs with a scan tool. Operate the vehicle for 5 minutes. Does a DTC set during this ignition cycle?	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information	-