Low Fuel Pressure Sensor -G410-, CHECKING

Function

Low-Side Fuel pressure is constantly measured by the Low Fuel Pressure Sensor -G410- and sent to the Engine Control Module -J623-. If this pressure deviates from the reference pressure, Engine Control Module -J623- sends a signal to the Fuel Pump Control Module -J538-. Fuel Pump Control Module -J538- then sends a PWM signal to the Transfer Fuel Pump -G6- until the desired fuel pressure is achieved.

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.
Coolant Temperature: ≥ 80° C.
Observe all safety precautions. Refer to: SAFETY PRECAUTIONS .
View clean working conditions. Refer to: CLEAN WORKING CONDITIONS .

Test Procedure

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 Low Fuel Pressure Sensor -G410-, CHECKING . -- NO: GATHER more information from customer about the complaint.
2	IGNITION: ON. DISCONNECT: Low Fuel Pressure Sensor -G410- harness connector. CHECK: Low Fuel Pressure Sensor -G410- harness connector terminals 1 to 3 for voltage. SPECIFIED VALUE: About 5.0 V. IGNITION: OFF. -- Was Value obtained?	-- YES: GO TO Step 3 Low Fuel Pressure Sensor -G410-, CHECKING . -- NO: GO TO Step 4 Low Fuel Pressure Sensor -G410-, CHECKING .
3	REMOVE: Engine Control Module - J623-. Refer to appropriate repair service information. CHECK: Low Fuel Pressure Sensor -G410- harness connector terminal 2 to the Engine Control Module - J623- harness connector terminal T94 / 15 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Low Fuel Pressure Sensor -G410-. Refer to appropriate repair service information. GO TO: Step 5 Low Fuel Pressure Sensor -G410-, CHECKING . -- NO: 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 Low Fuel Pressure Sensor -G410-, CHECKING .
4	REMOVE: Engine Control Module - J623-. Refer to appropriate repair service information. CHECK: Low Fuel Pressure Sensor -G410- harness connector terminal 1 to the Engine Control Module - J623- harness connector terminal T60 / 14 for resistance. CHECK: Low Fuel Pressure Sensor -G410- harness connector terminal 3 to the Engine Control Module - J623- harness connector terminal T60 / 37 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Engine Control Module -J623-. Refer to appropriate repair service information. GO TO: Step 5 Low Fuel Pressure Sensor -G410-, CHECKING . -- NO: 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 Low Fuel Pressure Sensor -G410-, CHECKING .
5	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.