Engine Controls - Repeated Code 34, MAF Sensor Low

Number 85-6(Gasoline)-58 Date 2/86
Subject: REPEAT INCIDENTS OF CODE 34 (MASS AIR FLOW SENSOR LOW)

1985 TRANS AM WITH LB9 5.0L TPI ENGINE (VIN CODE F)
If occurrences of trouble Code 34 (MAF Low) are encountered the following steps should be taken:

1. Check for engine vacuum leaks.

2. Set minimum idle speed to 500 RPM as described in your 1985 Shop Manual. (Page 6E3-148)

3. Perform diagnostic check for Code 34 found in your 1985 Shop manual. (Page 6E3-101)

4. If trouble Code 34 is shown to be "Intermittent", a new PROM should be installed as listed below:

Application PROM P/N

With A/C 1227741
W/O A/C 1227742

NOTICE: These service PROMS contain additional calibration changes designed to enhance vehicle driveability. Engine idle speed will be controlled to 650 RPM and the TCC engagement speed will be raised to 41 MPH.

Use applicable labor time and operation number.