Malibu V6-191 3.1L VIN M SFI (1997)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
PROM - False DTC P0121, Throttle Position Sensor
File In Section: 6E - Engine Fuel & Emission
Bulletin No.: 77-65-14A
Date: May, 1998
Subject:
False DTC P0121 (Reprogram PCM)
Models:
1997 Buick Century, Skylark
1997 Chevrolet Lumina, Monte Carlo, Malibu, Venture
1997 Oldsmobile Achieva, Cutlass, Cutlass Supreme, Silhouette
1997 Pontiac Grand Am, Grand Prix, Trans Sport
with 3100/3400 V6 Engine (VINs M, E - RPOs L82, LA1)
This bulletin is being revised to add additional models and calibration numbers. Please discard Corporate Bulletin 77-65-14 (Section 6E - Engine Fuel &
Emission).
Condition
Some owners may experience a MIL (Malfunction Indicator Lamp) light illuminated on the vehicle's instrument panel. Additionally, the engine's normal
controlled idle speed may be slightly elevated when the MIL is illuminated.
Cause
The current DTC (Diagnostic Trouble Code) P0121 is too sensitive. The rational check that the diagnostic calibration performs has been changed. Part
of those changes involve eliminating the defaulted higher idle.
Correction
