Circuit/System Testing

Ignition OFF, disconnect the harness connector at the Water in Fuel Sensor.
Test for less than 10 Ω between the ground circuit terminal 2 and ground.
- If 10 Ω or greater
  Repair the open/high resistance in the circuit.
- Go to next step: If less than 10 Ω
Ignition ON/Vehicle in Service Mode.
Verify that a test lamp illuminates between the ignition terminal 1 and ground.
- If the test lamp does not illuminate and the Ignition fuse is good
1. Ignition OFF, remove the test lamp.
2. Test for less than 2 Ω in the ignition circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, refer to Power Mode Mismatch .
- If the test lamp does not illuminate and the Ignition fuse is open
1. Ignition OFF, remove the test lamp.
2. Test for infinite resistance between the ignition circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the B116 Water in Fuel Sensor.
- Go to next step: If the test lamp illuminates
Ignition ON, Verify the scan tool Water in Fuel Sensor parameter is No Water.
- If the scan tool displays Water
1. Test for infinite resistance between the signal circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the K20 Engine Control Module.
- Go to next step: If scan tool displays No Water
Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground.
Ignition ON/Vehicle in Service Mode.
Verify the scan tool Water in Fuel Sensor parameter is Water.
- If scan tool displays No Water
1. 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, replace the K20 Engine Control Module.
- Go to next step: If scan tool displays Water
Test or replace the B116 Water in Fuel Sensor.