Intermittant DTC P0107, Map Sensor Low Voltage

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 67-65-28

Date: December, 1996

Subject:
Intermittent Diagnostic Trouble Code P0107 Map Sensor Circuit Low Voltage (PCM Flash Calibration)

Models:
1996 Chevrolet Cavalier
1996 Pontiac Sunfire
with 2.4L Engine (VIN T - RPO LD9) and 4T40-E Automatic Transmission (RPO MN4)

Condition

Some owners of the above listed vehicles may have a repeated concern with an intermittent MIL lamp accompanied by no specific driveability concerns. This condition may occur more frequently in areas that are mountainous or at high altitude. The owners concern will be accompanied by a stored DTC P0107 MAP Sensor Circuit Voltage Low.

Cause

The calibration originally installed in these vehicles is sensitive to long periods of closed throttle (0% TPS) at speeds between 38 and 42 MPH (61-68 km/h). This condition usually occurs when using the engine to slow the vehicle on long downhill grades with the selector in Drive (D) or Third (3).

Correction

A new calibration has been developed to correct this condition, this new calibration should only be installed if the owner states a concern with the above noted conditions. Perform the PCM flash calibration procedure using the number 23 CD-ROM update or a later version. Correct calibration information is listed in the chart below.

Applications/Emissions Broadcast Code Calibration Number & Scan ID

US Federal CBHY 16255623
California CBHZ 16255633
Canada/Export CBJA 16255643

Warranty Information

Use the labor operation listed below.

Labor Operation Description Labor Time

PROM -
J6355 Reprogramming, 0.4* hr

* Diagnosis time may be claimed for 0.0 to 0.7 hours depending on actual time performing diagnosis.