Diagnostic Aids
- The water in fuel sensor illuminates the Water in Fuel message when there is water in the fuel system. Perform the Water in Fuel Draining procedure before performing the following test steps to accurately determine if a malfunction exists. Refer to Water-in-Fuel Draining Procedure in Engine Controls - 6.6L.
- For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Water-in-Fuel Lamp Always On
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Instrument Cluster Schematics and Engine Controls Schematics
in Engine Controls - 6.6L (LLY) Connector End View Reference: Engine Control Module (ECM) Connector End Views in Engine Controls - 6.6L (LLY) |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Does the Water In Fuel message remain illuminated in the driver information center after the displays test? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 3 |
|
Go to Step 4 | Go to Step 6 |
| 4 | Test the signal circuit of the water in fuel switch for a short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 5 |
| 5 |
|
Go to Step 8 | Go to Step 7 |
| 6 | Inspect for poor connections at the harness connector of the water in fuel switch. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 9 |
| 7 | Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 10 |
| 8 | Inspect for poor connections at the harness connector of the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 12 | Go to Step 11 |
| 9 | Replace the water in fuel switch. Refer to Water-in-Fuel Sensor Replacement
in Engine Controls - 6.6L (LLY). Did you complete the replacement? |
Go to Step 12 | - |
| 10 | Replace the PCM. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 12 | - |
| 11 | Replace the IPC. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 12 | - |
| 12 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |