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

General Description

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 monitor 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: .
View clean working conditions: .
For Hybrid vehicles refer to: .

Test Procedure

NOTE:

When the door is opened or the Ignition is turned to the ON position the fuel pump may be 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 -- Was complaint verified?	-- YES: GO TO: Step 2 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 3 . NO: Gather more Information from customer about the complaint.
2	IGNITION: ON LISTEN: Transfer Fuel Pump -G6- 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 electrical connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 7 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 7 NO: GO TO: Step 3 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 3
3	DISCONNECT: Fuel Pump Control Module -J538- IGNITION: ON CHECK: Fuel Pump Control Module -J538- harness connector terminals 3 to 4 for voltage CHECK: Fuel Pump Control Module -J538- harness connector terminal 4 to battery voltage for voltage SPECIFIED VALUE: Battery voltage IGNITION: OFF -- Was value obtained?	-- YES: GO TO: Step 4 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 4 NO: PERFORM: Visual Inspection of wiring and component CHECK: wiring for open, high resistance, short or electrical connector for damage, corrosion, loose or broken terminals REPAIR: faulty wiring or connector REPLACE: Any open fuses GO TO: Step 7 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 7
4	RECONNECT: Fuel Pump Control Module -J538- DISCONNECT: Transfer Fuel Pump -G6- CRANK: Engine CHECK: Transfer Fuel Pump -G6- wiring connector terminals 1 to 5 for voltage while engine is cranking IGNITION: OFF SPECIFIED VALUE: 7 - 11 V -- Was value obtained?	-- YES: REPLACE: Transfer Fuel Pump -G6-, Refer to proper Service Information for removal and replace procedures GO TO: Step 7 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 7 NO: GO TO: Step 5 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 5
5	DISCONNECT: Fuel Pump Control Module -J538- CHECK: Transfer Fuel Pump -G6- wiring connector terminal 1 to Fuel Pump Control Module -J538- wiring connector terminal 1 for resistance CHECK: Transfer Fuel Pump -G6- wiring connector terminal 5 to Fuel Pump Control Module -J538- wiring connector terminal 2 for resistance SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω) -- Were values obtained?	-- YES: GO TO: Step 6 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 6 NO: PERFORM: Visual Inspection of wiring and component CHECK: wiring for open, high resistance, short or electrical connector for damage, corrosion, loose or broken terminals REPAIR: faulty wiring or connector GO TO: Step 7 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 7
6	REMOVE: Engine Control Module -J623-. Refer to the appropriate Service Information. CHECK: Fuel Pump Control Module -J538- wiring connector terminal 5 to Engine Control Module -J623- wiring connector terminal T91 / 9 for resistance SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω) -- Were values obtained?	-- YES: REPLACE: Fuel Pump (FP) Control Module -J538-. Refer to the appropriate Service Information. GO TO: Step 7 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 7 NO: PERFORM: Visual Inspection of wiring and component CHECK: wiring for open, high resistance, short or electrical connector for damage, corrosion, loose or broken terminals REPAIR: faulty wiring or connector GO TO: Step 7 Fuel Pump Control Module -J538- / Transfer Fuel Pump -G6-, CHECKING - 7
7	Final Procedure Perform a road test to verify repair. Do any DTC's return:	-- YES: CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins. REPAIR: As necessary. Clear the DTC's. Refer to Repair is complete. Generate Readiness Code. Refer to . 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 . 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.