MIL Light On Pretest Procedure

MIL LIGHT ON PRETEST PROCEDURE

For a complete wiring diagram, refer to the Wiring Information.

1. FUEL SYSTEM, AIR HANDLING, OR AFTERTREATMENT RELATED DTCs PRESENT

CAUTION: Inspect for aftermarket engine components on the vehicle (including labels indicating aftermarket software). If equipped with aftermarket components or software, the vehicle must be returned to OEM specifications.

1. With the scan tool, read and record all DTCs active and stored.

Are any one or more of the following DTCs present (P000F, P0087, P0402, P042E, P0489, P1011, P1451, P2262, P226B, P242F, P245A, P2563)?

Yes

- Go To 2

No

- Go To 5

2. VISUALLY INSPECT FOR SIGNS OF AFTERMARKET COMPONENTS
1. Inspect for aftermarket engine components on the vehicle (including labels indicating aftermarket software).

NOTE: If equipped with aftermarket components or software, the vehicle must be returned to OEM specifications.

Is the vehicle equipped with aftermarket performance software/parts?

Yes

- Performance enhancing software/parts may be the root cause of the customers concern. Performance enhancing software should be removed and the vehicle returned to stock before proceeding.
- Go To 3

No

- Go To 3

3. REVIEW VEHICLE WARRANTY HISTORY
1. Review vehicle warranty history and/or previously authored Diesel Diagnostic Worksheets to determine if the vehicle has returned for a repeat repair.

Has the vehicle returned within the last 90 days for a repeat with any of the following DTCs present, P000F, P0087, P0402, P042E, P0489, P1011, P1451, P2262, P226B, P242F, P245A, P2563?

Yes

- Perform the DIESEL FUEL CONTAMINATION AND CLEANING PROCEDURE. Fuel Contamination Diesel Fuel System Cleaning Procedure.

No

- Go To 4

4. VISUALLY INSPECT FOR EXTERNAL SIGNS OF FUEL CONTAMINATION
1. Inspect the vehicle for the following conditions:
- Review the vehicles repair history and verify proper Fuel Filter maintenance intervals have been followed.
- Auxiliary fuel tank that is CONNECTED to the vehicles fuel system or used as a STORAGE tank to fill the truck.
- Fuel stains on outside and inside of truck box/bed. This may be in indication that the driver is fueling the vehicle from an auxiliary source.
- Inspect the fuel filler cap, filler tube, and fuel filler cavity for signs of dirt and possible overfilling. Most auxiliary fuel tanks do not contain automatic shut off filler valves which may lead to over filling of the fuel tank.
- Inspect the top of the vehicles fuel tank for excessive oily dirt stains. Sometimes, gravity feed auxiliary fuel tank installers may feed the vehicles fuel tank from the auxiliary tank through the fuel tank vent valves.
- Inspect the fuel tank vent valves for signs of dirt or moisture contamination.
- Both P1451 AND P242F are the ONLY DTCs present.

Were any of the above conditions noted?

Yes

- Perform the DIESEL FUEL CONTAMINATION AND CLEANING PROCEDURE. Fuel Contamination Diesel Fuel System Cleaning Procedure.

No

- Go To 5

5. CHECK FOR TSBs/SOFTWARE FLASHES
1. Check for any TSBs/Software Flashes that may apply.

Were any TSBs/Software Flashes found and did they repair the problem?

Yes

- Repair complete.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Perform the diagnostic trouble code test that was found to be present. Testing and Inspection.