Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the K27 FPCM.
- Install a test lamp between the fuel pump control circuit terminal 20 and ground. Verify the test lamp turns ON and OFF as the ignition is turned ON.
- If the test lamp does not illuminate, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K20 ECM.
- Ignition ON, verify that a test lamp does not stay illuminated between the fuel pump control circuit terminal 20 and ground.
- If the test lamp stays illuminated, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
- If all circuits test normal, test or replace the K27 FPCM.