Code P034, Map Sensor Signal Too High: Action
WARNING: This page is about a different car, the 1995 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
PCM turns on MIL and uses a substitute MAP sensor value based on engine RPM and throttle position switch status. PCM disables long term fuel trim.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- MAP at idle should be 30-50 kPa, depending on engine load. BARO should be 85-105 kPa, depending upon altitude.
- Check for vacuum at fuel pressure regulator hose. At idle, typical vacuum reading should be 14-20 in. Hg, depending on engine load.
- Checks for MAP sensor or MAP circuit faults.
- Checks if sensor ground is open from sensor to PCM.
- Checks for short to voltage on circuit No. 432.
- Fault is most likely at PCM connector or PCM. Before replacing PCM, check for damaged pins or poor connections.