Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with 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 10Ω between the low reference circuit terminal 3 and ground.
- If 10Ω or greater
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
2. Test for less than 2Ω in the low reference circuit end to end.
  - If 2Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2Ω, replace the K20 Engine Control Module.
- If less than 10Ω
Ignition ON.
Verify the scan tool Fuel Level Sensor Left Tank parameter is greater than 4.8 V.
- If 4.8 V or less
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
2. 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, replace the K20 Engine Control Module.
- If greater than 4.8 V
Install a 3A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 3.
Verify the scan tool Fuel Level Sensor Left Tank parameter is less than 0.2 V.
- If 0.2 V or greater
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
2. Test for less than 1V between the signal circuit and ground.
  - If 1V or greater, repair the short to voltage on the circuit.
  - If less than 1V
3. Ignition OFF
4. Test for less than 2Ω in the signal circuit end to end.
  - If 2Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2Ω, replace the K20 Engine Control Module.
- If less than 0.2 V
Test or replace the B46 Fuel Level Sensor.