Fuel Pump Control Module - J538- / Transfer Fuel Pump - G6-, Checking

Function

The Engine Control Module -J623- tells the Fuel Pump Control Module -J538- the demand needed for fuel volume and pressure and activates the Transfer Fuel Pump -G6-. The Transfer Fuel Pump -G6- transfers fuel to the rest of the fuel system, where it is monitored by the Engine Control Module -J623- through sensors, and controlled through regulators and/or metering valves.

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: SAFETY PRECAUTIONS .
View clean working conditions: CLEAN WORKING CONDITIONS .
For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS .

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: Transfer Fuel Pump -G6- should be heard running for 2 sec. SPECIFIED VALUE: Transfer Fuel Pump ON for 2 sec. 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	DISCONNECT: Fuel Pump Control Module -J538-. IGNITION: ON. CHECK: Fuel Pump Control Module -J538- harness connector terminals 5 to 6 for voltage. SPECIFIED VALUE: Battery voltage. IGNITION: OFF. -- Was Value 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. REPLACE: Any open fuses. GO TO: Step 7.
4	RECONNECT: Fuel Pump Control Module -J538-. DISCONNECT: Transfer Fuel Pump -G6-. CRANK: Engine. CHECK: Transfer Fuel Pump -G6- harness connector terminals 2 to 3 for voltage while engine is cranking. IGNITION: OFF SPECIFIED VALUE: 7 - 11 V. -- Was Value obtained?	-- YES: REPLACE: Transfer Fuel Pump -G6-, Refer to appropriate Service Information. GO TO: Step 7. -- NO: GO TO Step 5.
5	DISCONNECT: Fuel Pump Control Module -J538-. CHECK: Transfer Fuel Pump -G6- harness connector terminal 1 to Fuel Pump Control Module -J538- harness connector terminal 4 for resistance. CHECK: Transfer Fuel Pump -G6- harness connector terminal 2 to Fuel Pump Control Module -J538- harness connector terminal 1 for resistance. CHECK: Transfer Fuel Pump -G6- harness connector terminal 3 to Fuel Pump Control Module -J538- harness connector terminal 2 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 the appropriate Service Information. CHECK: Fuel Pump Control Module -J538- harness connector terminal 3 to Engine Control Module -J623- harness connector T94 / 27 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Fuel Pump Control Module -J538-. Refer to the appropriate Service Information. PERFORM: Road Test to verify repair. FAULT DOES NOT RETURN: Generate readiness code. Refer to READINESS CODE . FAULT DOES RETURN: No malfunction is detected in the wiring. REPLACE: Engine Control Module -J623-. 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. Do any DTC's return:	-- YES: Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY . Perform the diagnostic procedure for that DTC. -- NO: Repair is complete. Generate readiness code. Refer to READINESS CODE . Return vehicle to Customer.