Fuel Pump Electrical, Testing: Notes

Special tools and workshop equipment required 

• Multimeter.
• Electrical connector test lead set.

Test conditions 

• Battery voltage 12.5 V.
• Fuel pump fuse is OK.
• Fuel filter OK.
• Ignition switched Off.

Test procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK 

Start diagnosis 

-- Ignition switched ON.

Specified value: Fuel Pump On for 2 seconds

-- Ignition switched OFF.

If the specified value Was obtained: 

-- Condition may be intermittent

-- Check the wiring for an open, high resistance or short to ground.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection and replace any open fuses.

-- Go to Final procedures

If the specified value was Not obtained: 

-- Disconnect the electrical harness connector T10n from the Fuel Pump Control Module -J538-.

-- Connect the Multimeter ground lead to Fuel Pump Control Module -J538- harness connector T10n terminal 4.

-- Connect the Multimeter positive lead to Fuel Pump Control Module -J538- harness connector T10n terminal 5.

-- Ignition switched ON.

Specified value: Battery voltage

-- Ignition switched OFF.

If the specified value was Not obtained: 

-- Check the wiring from the Fuel Pump Control Module -J538- electrical harness connector T10n terminal 4 to the Instrument Cluster Control Module -J285- for an open circuit or a short circuit to Ground (GND), also connector terminal 5 for a open circuit to Ground (GND).

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection and replace any open fuses.

-- Go to Final procedures

If the specified value Was obtained: 

-- Disconnect the electrical harness connector from the Fuel Pump Control Module -J538- to the Transfer Fuel Pump -G6- fuel delivery unit.

-- Connect the Multimeter positive lead to terminal 1 of the Fuel Delivery Unit harness connector.

-- Connect the Multimeter ground lead to terminal 4 of the Fuel Delivery Unit harness connector.

-- Crank the engine and note voltage displayed on Multimeter during cranking.

Specified value: Voltage should be within 2 volts of battery voltage.

-- Ignition switched OFF.

-- Continue test according to the following table:

Value	Cause	Test
If the specified value was Not obtained:	Check reference signal circuit	Checking wiring
If the specified value Was obtained:	Check Transfer Pump	Checking wiring