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 ENGINES. SINGLE EXHAUST ON SOME VEHICLES EQUIPPED WITH 3.0L 4-VALVE DURATEC ENGINES.





Obtain an Authorized Modifications Decal (FPS 8262 - obtainable through DOES II, 25/pkg) and list the date, dealer number, and summary of modifications performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.

OTHER APPLICABLE ARTICLES: NONE

WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATION DESCRIPTION TIME

991205A Reprogram Powertrain 0.6 Hr.
Control Module (PCM)

DEALER CODING
CONDITION
BASIC PART NO. CODE
RECAL 42

OASIS CODES: 206000, 608600, 610000, 610500, 612000, 698298