Pcm Code E34, Map Signal Too High: Action
PCM turns on SERVICE ENGINE SOON light. PCM sets BARO at 92 kPa and substitutes MAP sensor values based on engine RPM and throttle switch status.
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 on altitude.
- Check for vacuum at MAP sensor hose using vacuum gauge. At idle, typical vacuum readings are 14-20 in. Hg depending on engine load.
- Checks for faulty MAP sensor or MAP circuitry.
- Checks for sensor ground open from sensor to PCM.
- Checks for short to voltage on sensor signal circuit No. 432.
- Fault is most likely at PCM connector or PCM. Before PCM is replaced, perform PFI CHART C-1, PCM REPLACEMENT CHECK.