Circuit/System Testing
- Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A7 Fuel Pump and Level Sensor Assembly. It may take up to 2 minutes for all vehicle systems to power down.
- Test for less than 10 Ω between the low reference circuit terminal 3 and ground.
- If 10 Ω or greater
- Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
- Test for less than 2 Ω in the low reference circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K20 Engine Control Module.
- If less than 10 Ω
- Ignition ON.
- Test for less than 1 V between the low reference circuit and ground.
- If 1 V or greater
Repair the short to voltage on the circuit.
- If less than 1 V
- If 1 V or greater
- Verify the scan tool Remaining Fuel In Tank parameter is greater than 95%.
- If 95% or less
- Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
- Test for less than 1 V between the signal circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
- If greater than 95%
- Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
- Test for infinite resistance between the signal circuit terminal 4 and ground.
- If less than infinite resistance
Repair the short to ground on the circuit.
- If infinite resistance
- If less than infinite resistance
- Ignition OFF
- Test for less than 2 Ω in the signal circuit end to end.
- If 2 Ω or greater
Repair the open/high resistance in the circuit.
- If less than 2 Ω
- If 2 Ω or greater
- Test or replace the B46 Fuel Level Sensor.