2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2538
* Fuel Pump Relay Ckt. Short Volts Test Status
Each parameter should toggle between OK and Not Run or Not Run and OK.
Circuit/System Testing
1. Ignition OFF, disconnect the fuel pump relay.
2. Ignition ON, verify that a test lamp illuminates between the ground circuit terminal 85 and B+.
瀚慖f the test lamp does not illuminate, test the ground circuit for a short to voltage or an open/high resistance.
3. Verify that a test lamp does not illuminate between the ground circuit terminal 85 and the control circuit terminal 86.
瀚慖f the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Remove the test lamp.
5. Command the fuel pump relay ON with a scan tool. Verify the scan tool fuel pump relay Ckt. Short Grnd Test Status parameter is OK.
瀚慖f not the specified value, test the fuel pump relay control circuit for a short to ground. If the circuit tests normal, replace the ECM.
6. Install a 3A fused jumper wire between the fuel pump relay control circuit terminal 86 and the ground circuit terminal 85. Command the fuel
pump ON with a scan tool. Verify the scan tool fuel pump relay Ckt. Short Grnd Test Status parameter is Fault.
瀚慖f not the specified value, test the fuel pump relay control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
7. Inspect the fuel pump fuse.
瀚慖f the fuel pump fuse is open, test for the following conditions:
* A short to ground in the relay switch B+ circuit
* A short to ground in the supply voltage circuit of the fuel pump
瀚慖f the above circuits test normal, replace the fuel tank module.
8. Verify that a test light illuminates between the B+ circuit and ground.
瀚慖f the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
9. Connect a 15A fused jumper wire between the B+ circuit and the supply voltage circuit of the fuel pump. Verify the fuel pump is activated.
瀚慖f the fuel pump does not activate, test for the following conditions:
* An open/high resistance in the supply voltage circuit of the fuel pump
* An open/high resistance in the ground circuit of the fuel pump
瀚慖f the above circuits test normal, replace the fuel tank module.
10. If all circuits test normal, test or replace the fuel pump relay.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 gal) Tank Rear) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module Replacement (2500 LWB - 43.5L (11.5 Gal) Tank Rear))Fuel Tank
Fuel Pump Module Replacement (2500 LWB - 98.4L (26 gal) Tank Front) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module Replacement (2500 LWB - 98.4L (26 Gal) Tank Front))Fuel Tank
Fuel Pump Module Replacement (1500 SWB - 98.4L (26 gal) Tank + E85) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module Replacement (1500 SWB - 98.4L (26 Gal) Tank + E85))Fuel Tank
Fuel Pump Module Replacement (1500 Series) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Service and
Repair/Fuel Tank Fuel Pump Module Replacement (1500 Series))Fuel Tank Fuel Pump Module Replacement (1500 LWB - 117.3L (31 gal)
Tank + E85) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Service and Repair/Fuel Tank Fuel Pump Module
Replacement (1500 LWB - 117.3L (31 Gal) Tank + E85))
* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay
Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power
Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
6L50/6L80/6L90 - Automatic Transmission
