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 Inoperative
| 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 |
|
Go to Step 3 | Go to Step 4 |
| 3 |
|
Go to Step 9 | Go to Step 6 |
| 4 | Test the signal circuit of the water in fuel sensor for an open or for a high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 13 | Go to Step 5 |
| 5 |
|
Go to Step 7 | Go to Step 8 |
| 6 | Test the low reference circuit of the water in fuel sensor for an open or for a high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 13 | Go to Step 9 |
| 7 | 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 13 | Go to Step 10 |
| 8 | 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
. Did you find and correct the condition? |
Go to Step 13 | Go to Step 11 |
| 9 | Inspect for poor connections at the harness connector of the water in fuel sensor. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 13 | Go to Step 12 |
| 10 | Replace the IPC. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 13 | - |
| 11 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 13 | - |
| 12 | Replace the water in fuel sensor. Refer to:
Did you complete the replacement? |
Go to Step 13 | - |
| 13 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |