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 Auto. Transmission, ensure Selector Lever position is in "P".
Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with 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 Engine Component Power Supply Relay -J757-, CHECKING - 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. CHECK: Engine Component Power Supply Relay -J757- harness connector terminal 111 (relay term 86) and 113 (relay term 30) to ground for voltage. SPECIFIED VALUE: Battery voltage. IGNITION: OFF. -- Were Values obtained?	-- YES: GO TO: Step 3 Engine Component Power Supply Relay -J757-, CHECKING - 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 Engine Component Power Supply Relay -J757-, CHECKING - 5 .
3	CONNECT: Jumper wire, Engine Component Power Supply Relay -J757- socket terminals 113 (relay term 30) and 115 (relay term 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 terminal 4 to ground for voltage. SPECIFIED VALUE: Battery voltage. -- Were Values obtained?	-- YES: GO TO: Step 4 Engine Component Power Supply Relay -J757-, CHECKING - 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 Engine Component Power Supply Relay -J757-, CHECKING - 5 .
4	REMOVE: Jumper wire, Engine Component Power Supply Relay -J757- socket terminals 113 (relay term 30) and 115 (relay term 87). REMOVE: Engine Control Module -J623-. Refer to appropriate service information. CHECK: Engine Component Power Supply Relay -J757- harness connector terminal 112 (relay term 85) to the Engine 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 the appropriate service information. GO TO: Step 5 Engine Component Power Supply Relay -J757-, CHECKING - 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 Engine Component Power Supply Relay -J757-, CHECKING - 5 .
5	Final Procedure Perform a road test to verify repair. -- Does the original DTC return?	-- YES: CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins. REPAIR: As necessary. If all electrical connections are OK: REPLACE: Engine 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.