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. IGNITION: OFF. SPECIFIED VALUE: Transfer Fuel Pump ON for 2 s. -- 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	DISCONNECT: Fuel Pump Control Module. -J538- harness connector. IGNITION: ON. CHECK: Fuel Pump Control Module -J538- harness connector terminals 5 to 4 for voltage. CHECK: Fuel Pump Control Module -J538- harness connector terminal 4 to battery voltage 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 7.
4	RECONNECT: Fuel Pump Control Module -J538- harness connector. DISCONNECT: Fuel Delivery Unit -GX1- harness connector. CRANK: Engine. CHECK: Fuel Delivery Unit -GX1- harness connector terminals 2 to 4 for voltage while engine is cranking. IGNITION: OFF. SPECIFIED VALUE: 7 - 11 V. -- Was Value obtained?	-- YES: REPLACE: Fuel Delivery Unit -GX1-, Refer to appropriateservice information. GO TO: Step 7. -- NO: GO TO: Step 5.
5	DISCONNECT: Fuel Pump Control Module -J538- harness connector. CHECK: Fuel Delivery Unit -GX1- harness connector terminal 2 to the Fuel Pump Control Module -J538- harness connector terminal 2 for resistance. CHECK: Fuel Delivery Unit -GX1- harness connector terminal 3 to the Fuel Pump Control Module -J538- harness connector terminal 1 for resistance. CHECK: Fuel Delivery Unit -GX1- harness connector terminal 1 to the Fuel Pump Control Module -J538- harness connector terminal 3 for resistance. CHECK: Fuel Delivery Unit -GX1- harness connector terminal 4 to ground 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 appropriateservice information. CHECK: Fuel Pump Control Module -J538- harness connector terminal 6 to the Engine Control Module -J623- harness connector T94 / 76 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Fuel Pump Control Module -J538-. Refer to appropriateservice 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. If all electrical connections are OK: REPLACE: Engine Control Module -J623-. Refer to appropriateservice information. 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. -- NO: Perform the diagnostic procedure for any DTC's. If no DTC's return, the repair is complete. Return vehicle to customer.