Pcm Code EO34, Map Signal Too High: Action:

PCM turns on SERVICE ENGINE SOON light. PCM uses a substitute barometric sensor value of 92 kPa and substitutes MAP sensor value on engine RPM and throttle switch status.

This test monitors the MAP signal engine load under closed throttle conditions. The MAP sensor output voltage is a DC voltage that varies with MAP. If MAP signal is too high the closed throttle conditions present when the PCM monitors the signal, the PCM would set a code.

1. MAP at idle should be 30-50 kPa, depending on engine load. BARO pressure should be 85-105 kPa, depending upon altitude.
2. Check vacuum at MAP sensor hose with vacuum gauge. At idle, typical vacuum readings are 14-20 in. Hg, depending on engine load.
3. This checks faulty MAP sensor vacuum supply or MAP sensor circuitry.
4. Checks sensor ground open from sensor to PCM.
5. Checks short to voltage on sensor signal circuit No. 432.
6. Fault is at PCM connector or PCM. See PFI CHART C-1, PCM REPLACEMENT CHECK before PCM is replaced.