Sable V6-3.0L VIN U (1999)
PROM - Programmable Read Only Memory: Customer Interest
PCM - Lack of Engine Braking/DTC P1138 Set
Article No.
99-12-5
06/14/99
LACK OF ENGINE BRAKING - DIAGNOSTIC
TROUBLE CODE (DTC) P1138 DURING KEY ON
ENGINE RUNNING (KOER) - VEHICLES WITH 3.0L
ENGINE
FORD:
1999 TAURUS
LINCOLN-MERCURY:
1999 SABLE
ISSUE
There may be a perceived lack of engine braking due to the increased dashpot function in the Powertrain Control Module (PCM) calibration on some
3.0L engine vehicles. Diagnostic Trouble Code (DTC) P1138 (Heated Exhaust Gas Oxygen (HEGO) rich) may be appear during KOER. This may be
caused by PCM calibration strategy.
ACTION
Reprogram the PCM. Refer to the following Service Procedure for details.
SERVICE PROCEDURE
1.
Retrieve, then clear DTCs from PCM continuous memory.
2.
If a DTC P1138 appears during KOER, perform normal diagnostics in accordance with the 1999 Powertrain Control/Emissions Diagnosis
(PC/ED) Service Manual for DTC P1138.
3.
If no problem was found after performing Step 2, no other DTCs were present, and the concern is still present, reprogram the PCM with the latest
level calibration using Service Bay Diagnostic System (SBDS) or New Generation Star (NGS) Tester. Refer to the PCM Reprogramming
Information Chart to identify the appropriate calibration.
NOTE
THE OVERDRIVE SWITCH HAS BEEN DELETED FROM THE SHIFTER ON VEHICLES EQUIPPED WITH 3.0L 4-VALVE DURATEC
