Fuel Pump Electrical, Testing
Fuel Pump Electrical, Testing
Special tools, testers and auxiliary items required
• multimeter.
• Electrical connector test lead set.
Test conditions
• Battery voltage 12.5 V.
• Fuse - 27 - in Fuse Panel C is OK.
• Fuel filter OK.
• Ignition switched off.
Test procedure
- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check
Start diagnosis
- Remove rear seat bench. Refer to appropriate service information.
- Remove the Fuel Pump Control Module from the retaining clips on the floor sealing cover.
- Disconnect the electrical harness connector - arrow - from the Fuel Pump Control Module.
- Connect the multimeter ground lead to terminal - 6 - of the Fuel Pump Control Module harness connector.
- Connect the multimeter positive lead to terminal - 1 - of the Fuel Pump Control Module harness connector.
- Turn the Ignition key to the ON position.
- The meter should read within 1volt of battery voltage.
- If voltage is below specification, locate wiring fault in ground or power circuit. Refer to wiring diagram for location.
- If voltage is OK, connect multimeter positive lead to terminal - 3 - of the Fuel Pump Control Module harness connector. The ground lead remains on terminal - 6 -
- Crank the engine and note voltage displayed on multimeter during crank. Voltage should be within 2.5 volts of battery voltage.
- If voltage is below specification, locate wiring fault in the power circuit. Refer to wiring diagram for location.
- If voltage is OK, connect multimeter positive lead to terminal - 2 - of the Fuel Pump Control Module harness connector. The ground lead remains on terminal - 6 -
- Crank the engine and note voltage displayed on multimeter during crank. Voltage should be 3.2 volts (+/-.4)
- If voltage is below specification, check circuit from Fuel Pump Control Module to ECM for open, short or high resistance and repair as necessary. If no circuit fault is found, replace ECM.
- If voltage is OK, reconnect the wiring harness to the Fuel Pump control Module.
Test procedure for Fuel Pump Control Module
- Remove the floor sealing cover to access the Fuel Delivery Unit (fuel pump).
- Disconnect the harness connector from the 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 - 5 - of the Fuel Delivery Unit harness connector.
- Crank the engine and note voltage displayed on multimeter during crank. Voltage should be within 2.5 volts of battery voltage.
- If voltage is below specification, replace the Fuel Pump Control Module.
- If voltage is within specification, replace the Fuel Delivery Unit (Fuel Pump). Refer to appropriate service information.
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 0A.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 0A.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.
Fuel Pump G6, Checking
• Models with an airbag are installed with a crash fuel shut-off system. It reduces the danger of a fire in a crash as the fuel pump is switched off via the fuel pump relay.
• When the door is opened the fuel pump is activated for 2 seconds to build up the pressure in the fuel system.
Special tools, testers and auxiliary items required
• Hand held remote control (jumper).
• Multimeter.
• Electrical connector test lead set.
Test conditions
• Battery voltage at least 12.5 volts.
• Fuel Pump (FP) Relay (J17) OK.
• Fuel filter OK.
• Ignition switched off.
Test procedure
- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check.
Test sequence
- Remove the rear seat bench. Refer to appropriate appropriate repair information.
- Remove cover retainers - arrows - from the right sealing flange.
- Disconnect the electrical harness connector - arrow - from the fuel delivery unit.
- Connect a Hand held remote control (jumper) to terminal - 1 - of the fuel delivery unit and to vehicle battery (+).
- Connect a jumper cable from an Electrical connector test lead set to terminal - 4 - of the fuel delivery unit and to vehicle Ground (GND).
- Press switch on the Hand held remote control (jumper).
• The Fuel Pump (FP) runs quietly. Avoid surrounding noises while testing the fuel pump.
- Listen for an operating noise from the fuel pump.
If no operating noise is heard:
- Remove the fuel delivery unit.
- Using a Multimeter, check the electrical circuit between terminals 1 to 1 and 4 to 4 of the fuel delivery unit pump motor for resistance.
Specified value: 1.5 ohms max.
If the specification was not obtained:
- Check the wiring for an open circuit, a short circuit to Battery positive (+) or to Ground (GND).
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the wiring connection.
If the specification was obtained:
- Replace the fuel delivery unit.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 0A.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 0A.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.