Engine Controls - Code 34 MAF Sensor Voltage Low
Number 85-6(Gasoline)-56 Date 12/85Subject: CODE - 34 MASS AIR FLOW SENSOR VOLTAGE LOW
1985 "F" CAR WITH LB9 ENGINE (ENGINE CODE F)
Some "F" cars with the port fuel engine may experience complaints of check engine light and poor driveability. It has been determined that Mass Air Flow Sensors have been replaced and in many cases have not corrected the complaint.
If this condition occurs and a Code 34 is found stored in the ECM, the following steps should be taken.
1. Check engine for vacuum leaks.
2. Set minimum idle speed to 500 RPM as described in the 1985 Shop Manual. (Page 6E3-148)
3. Perform diagnostic check for Code 34 found in your 1985 Shop Manual. (Page 6E3-101)