WATER IN FUEL SENSOR FAULTED HIGH (BCM)
For a complete wiring diagram Refer to Section 8W.
Diagnostic Test
- When Monitored:
With the Ignition on.
- Set Condition:
The BCM detects a High condition on the Water In Fuel Sensor Signal Circuit.
| Possible Causes |
| (K303) WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| (K303) WATER IN FUEL SENSOR SIGNAL CIRCUIT OPEN |
| (K300) SENSOR GROUND CIRCUIT OPEN |
| BCM |
| WATER IN FUEL SENSOR |
Diagnostic Test
1. WATER IN FUEL SENSOR
Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Connect a jumper wire between the (K303) and (K300) circuits at the Water In Fuel Sensor harness connector.
Turn the ignition on.
NOTE: Check connectors - Clean/repair as necessary.
With the scan tool, check DTCs.
Does the scan tool display: WATER IN FUEL SENSOR FAULTED HIGH?
Yes
- Replace the Water In Fuel Sensor.
- Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To 2
2. (K303) WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the BCM C2 harness connectors.
Ignition on, engine not running.
Measure the voltage on the (K303) Water In Fuel Sensor Signal circuit.
Is the voltage above 5.3 volts?
Yes
- Repair the short to voltage in the (K303) Water In Fuel Sensor Signal circuit.
- Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To3
3. (K303) WATER IN FUEL SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (K303) Water In Fuel Sensor Signal circuit.
Is the resistance below 5.0 ohms?
Yes
- Go To4
No
- Repair the open in the (K303) Water In Fuel Sensor Signal circuit.
- Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
4. (K300) SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the (K300) Sensor ground circuit.
Is the resistance below 5.0 ohms?
Yes
- Go To5
No
- Repair the open in the (K300) Sensor ground circuit.
- Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
5. BCM
NOTE: Before continuing, check the BCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
Repair
- Replace and program the Powertrain Control Module per Service Information.
- Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)