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 .
- For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections .
Water-in-Fuel Lamp Always On
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Instrument Cluster Schematics , Engine Controls Schematics
for the 6.6L (LMM) engine, orEngine Controls Schematics
for the 6.6L (LBZ and LLY) engine Connector End View Reference: Engine Control Module Connector End Views for the 6.6L (LMM) engine, orEngine Control Module Connector End Views for the 6.6L (LBZ and LLY) engine |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Does the Water In Fuel indicator remain illuminated in the instrument panel cluster (IPC) after the displays test? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections |
| 3 |
|
Go to Step 4 | Go to Step 6 |
| 4 | Test the signal circuit of the water in fuel sensor for a short to ground. Refer to Circuit Testing
and Wiring Repairs
. 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
. 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 PCM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. 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 IPC. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 12 | Go to Step 11 |
| 9 | Replace the water in fuel sensor. Refer to:
Did you complete the replacement? |
Go to Step 12 | - |
| 10 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 12 | - |
| 11 | Replace the IPC. Refer to Control Module References
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 |