Five Hundred AWD V6-3.0L VIN 1 (2005)
Fuel Temperature Sensor: All Technical Service Bulletins
Fuel System/Engine Controls - MIL ON/DTC P0191 Set
TSB 07-4-7
03/07/05
MIL ON WITH DTC P0191 - FUEL RAIL PRESSURE SENSOR CIRCUIT PERFORMANCE
FORD:
2005-2006 Five Hundred, Freestyle
MERCURY:
2005-2006 Montego
This article supersedes TSB 06-18-12 to update the the Service Procedure date code format.
ISSUE
Some 2005-2006 Freestyle, Five Hundred, and Montego vehicles may exhibit intermittent malfunction indicator light (MIL) on with diagnostic trouble
code (DTC) P0191 for fuel rail pressure sensor circuit performance. Other DTCs and/or driveability concerns may also be present.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
If the concern is a hard fault and can be verified, perform normal diagnostics by following revised on-line Powertrain Controls/Emissions Diagnosis
(PC/ED) pinpoint tests.
For Intermittent Concerns:
NOTE
IF CONCERN IS FOUND AT ANY POINT WHILE PERFORMING SPECIFIC CHECKS BELOW, IT IS NOT NECESSARY TO PERFORM
REMAINING CHECKS/REPAIRS.
1.
A possible short of the VREF signal internal to the EGR system module (ESM) may result in less than 5 volts on the VREF signal line. To check
for internal ESM short, check resistance between Pin-2 (VREF) and Pin-6 (signal return) on the ESM with ESM harness disconnected. If
resistance is less than 2000 ohms, replace ESM following Workshop Manual (WSM), Section 303-08.
2.
Inspect main engine harness to powertrain control module (PCM) rub through on the A/C line at back right of engine compartment. Repair as
necessary.
3.
Inspect fuel rail pressure and temperature sensor located at top right of engine for broken or cracked vacuum port. Replace as necessary following
WSM, Section 303-14.
4.
Inspect inertia fuel shutoff (IFS) located in front passenger foot well for loose or disconnected wiring/connector and build date code on switch. If
switch was built before November 2005 (5 L XXX) replace switch. Date code is visible without removing switch and is located near top of switch.
(Figure 1)
a.
Format is Year (4=2004, 5=2005, 6=2006) Month (A=Jan, B=Feb, C=Mar "I" is not used) Day (1-31) Shift (X or Y). On all vehicles,
