Test Procedure

NOTE:

When the door is opened or the Ignition is turned to the ON position the fuel pump is activated for 2 seconds to build up the pressure in the fuel system.

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK . -- Was Complaint verified?	-- YES: GO TO: Step 2. NO: GATHER more Information from customer about the complaint.
2	IGNITION: ON. LISTEN: Fuel Delivery Unit -GX1- Should be heard running for 2 s. SPECIFIED VALUE: Transfer Fuel Pump ON for 2 s. IGNITION: OFF. -- Was Value obtained?	-- YES: Condition may be intermittent. 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 7. NO: GO TO: Step 3.
3	IGNITION: OFF. DISCONNECT: Fuel Pump Control Module. -J538- IGNITION: ON. CHECK: Fuel Pump Control Module -J538- harness connector terminals 4 to 5 for voltage. CHECK: Fuel Pump Control Module -J538- harness connector terminal 4 to battery voltage for voltage. SPECIFIED VALUE: Battery voltage. IGNITION: OFF. -- 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 7.
4	RECONNECT: Fuel Pump Control Module -J538-. DISCONNECT: Fuel Delivery Unit -GX1-. CRANK: Engine. CHECK: Fuel Delivery Unit -GX1- harness connector terminals 1 to 2 for voltage while engine is cranking. IGNITION: OFF. SPECIFIED VALUE: 7 - 11 V. -- Was Value obtained?	-- YES: REPLACE: Fuel Delivery Unit -GX1-, Refer to appropriate service information. GO TO: Step 7. NO: GO TO: Step 5.
5	DISCONNECT: Fuel Pump Control Module -J538-. CHECK: Fuel Delivery Unit -GX1- harness connector terminal T4db / 1 to Fuel Pump Control Module -J538- wiring connector 3 for resistance. CHECK: Fuel Delivery Unit -GX1- harness connector terminal T4db / 2 to Fuel Pump Control Module -J538- wiring connector 2 for resistance. CHECK: Fuel Delivery Unit -GX1- harness connector terminal T4db / 3 to Fuel Pump Control Module -J538- wiring connector 1 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were values obtained?	-- YES: GO TO: Step 6. 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 7.
6	REMOVE: Engine Control Module -J623-. Refer to appropriate service information. CHECK: Fuel Pump Control Module -J538- harness connector terminal 6 to Engine Control Module -J623- wiring connector terminal T94 / 71 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were values obtained?	-- YES: REPLACE: Fuel Pump Control Module -J538-. Refer to appropriate service information. GO TO: Step 7. 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 7.
7	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. Clear the DTC's. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY . Repair is complete. Generate Readiness Code. Refer to READINESS CODE . Return vehicle to Customer. If all electrical connections are OK: REPLACE: Engine Control Module -J623-. Refer to appropriate service information. Repair is complete. Generate Readiness Code. Refer to READINESS CODE . 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.