Engine Component Power Supply Relay - J757-, Checking

General Description

The following procedure is used to diagnose the Engine Component Power Supply Relay -J757- and the power supply voltage that is provided to the Ignition Coils --.

Special tools and workshop equipment required

Multimeter.
Wiring Diagram.
Scan Tool.

Test requirements

Fuses OK.
Battery voltage OK.
Switch OFF all electrical and electronic accessories.
Vehicles with automatic transmission, ensure the selector lever position is in "P".
Vehicles with manual transmission, ensure the shifter lever position is in "N" with the parking brake applied.
Observe all safety precautions: .
View clean working conditions: .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers concern. Refer to . -- Was Complaint verified?	-- YES: GO TO: Step 2. -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Engine Component Power Supply Relay -J757- from the fuse box in the engine compartment. IGNITION: ON. CHECK: Engine Component Power Supply Relay -J757- socket terminals 1/86 and 3/30 to ground for voltage. IGNITION: OFF. SPECIFIED VALUE: Battery voltage. -- Were Values obtained?	-- YES: GO TO: Step 3. -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 5.
3	CONNECT: Jumper wire, between the Engine Component Power Supply Relay -J757- socket terminals 3/30 and 5/87. DISCONNECT: Ignition Coil 1, 2, 3, 4 With Power Output Stage -N70, N127, N291, N292- harness connectors. CHECK: Ignition Coil 1, 2, 3, 4 With Power Output Stage -N70, N127, N291, N292- harness connector terminals 4 to ground for voltage. IGNITION: OFF. SPECIFIED VALUE: Battery voltage. -- Were Values obtained?	-- YES: GO TO: Step 4. -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 5.
4	REMOVE: Jumper wire, between the Engine Component Power Supply Relay -J757- socket terminals 3/30 and 5/87. REMOVE: Engine/Motor Control Module -J623-. Refer to appropriate Service Information. CHECK: Engine Component Power Supply Relay -J757- socket terminal 2/85 to the Engine/Motor Control Module -J623- harness connector T91 / 8 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Engine Component Power Supply Relay -J757-. Refer to appropriate Service Information. GO TO: Step 5. -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 5.
5	Final Procedure Perform a road test to verify repair. -- Does the original DTC return?	-- YES: CHECK: Engine/Motor Control Module -J623- harness connector for any damaged, pushed-out pins. REPAIR: As necessary. If all electrical connections are OK: REPLACE: Engine/Motor Control Module -J623-. Refer to appropriate Service Information. Clear the DTC's. Refer to . Repair is complete. Generate Readiness Code. Refer to . Return vehicle to Customer. -- NO: Perform the diagnostic procedure for any DTC's. If no DTC's return, the repair is complete. Return vehicle to customer.