Fuel System - Runs Rough/Hard/No Start/DTCs P1291/P1292

TSB 11-10-10

10/10/11

6.7L DIESEL - RUNS ROUGH/ENGINE CRANKS - NO
START - DTCS P1291 AND/OR P1292

FORD:
2011-2012 F-Super Duty

This article supersedes TSB 11-6-10 to update the
vehicle model years, Issue Statement, Service
Procedure, Service Labor Time Standards and Part
List.

ISSUE
Some 2011-2012 F-Super Duty vehicles equipped with a 6.7L engine may exhibit diagnostic trouble codes (DTC) P1291 and/or P1292 due to an internally shorted fuel injector. An internal short in a fuel injector may be caused by the fuel being contaminated with diesel exhaust fluid (DEF), or by fuel gelling.

ACTION
Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE

1. Remove the fuel conditioning module mounted filter. Refer to Workshop Manual (WSM), Section 310-01.








2. Allow the filter and filter bowl to dry for two hours. Did the filter and or filter bowl turn white? (Figures 1 and 2)

a. No - proceed to Step 3.

b. Yes - Do not continue with this article. Fuel contamination is non-warrantable. The concern was caused by the fuel being contaminated with DEF. The complete high pressure fuel system and diesel fuel control module (DFCM) will need to be replaced. The base fuel system will need to be flushed. Refer to WSM, Section 303-04C for fuel system replacement.





3. Inspect the engine wiring harness (12B637) for wire chafes near the EGR cooler. Was a chafe present? (Figure 3)

a. No - proceed to Step 4.

b. Yes - repair as necessary. Vehicles built on or before 5/26/2010: position the metal EGR cooler gasket tab eyelet rearward and flush with the cooler housing. Release vehicle.

4. Electrically disconnect each fuel injector for the suspect DTC P1291 injectors 1, 4, 6, 7 and/or DTC P1292 injectors 2, 3, 5, 8.

5. Check for continuity between the injector electrical pins and the injector body, is continuity present?

a. No - do not continue with this article, Refer to Powertrain Control/Emission Diagnostics (PC/ED) Manual for normal diagnostics.

b. Yes - replace all eight (8) fuel injectors and the injector return hose. Refer to WSM, Section 303-04C.





Parts Block

WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage And Emissions Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

OPERATION DESCRIPTION TIME

111010A 2011-2012 F-Super Duty 4.7 Hrs.
6.7L Single Rear Wheel:
Inspect Fuel Conditioning
Module, Engine Wiring
Harness, Test And
Replace The Fuel
Injectors, And The Injector
Return Hose

111010B 2011-2012 F-Super Duty 4.9 Hrs
6.7L Dual Rear Wheel:
Inspect Fuel Conditioning
Module, Engine Wiring
Harness Test And Replace
The Fuel Injectors, And
The Injector Return Hose

MT11010 Claim Actual Time For Actual
Engine Wire Harness Time
Repairs

DEALER CODING
CONDITION
BASIC PART NO. CODE
9A564 42





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