Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
NOTE:
Do not replace the fuel pump control module based on a history DTC P2635. The DTC P2635 may be stored but that does not indicate a failure of the fuel pump control module. Refer to Strategy Based Diagnosis for further history DTC diagnostics.
- Verify that DTCs P018B, P018C, P018D, P0231, P0232, or P023F are not set.
- If the DTCs are set, refer to DTC P018B-P018D , or DTC P0231, P0232, or P023F .
- Perform the Fuel System Diagnosis to verify proper fuel pressure.
- If the fuel pressure is not normal, replace the G12 Fuel Pump.
- Ignition OFF, disconnect the harness connector at the fuel tank pump module.
- Ignition ON, test for less than 5.0 Ω between the fuel pump module low reference circuit terminal A and ground.
- If greater than the specified range, test the fuel pump module low reference circuit for a high resistance. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
- Ignition OFF, install a test lamp between the control circuit terminal D and the control circuit terminal A.
- Ignition ON, command the fuel pump ON and OFF using a scan tool ECM fuel pump output control. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
- If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
- If all circuits test normal, replace the K27 Fuel Pump Control Module.