Diagnostic Aids:

The MAP sensor output voltage is a DC voltage that varies with MAP. As MAP decreases, voltage on circuit No. 432 decreases (low engine load, high engine vacuum). As MAP increases, voltage on circuit No. 432 increases (high engine load, low engine vacuum). Code "EO32" sets when the ECM detects a MAP sensor signal out of low limits (MAP signal at 16 KPA or less and MAP voltage at .08 volts or less).

1. Check for circuitry from sensor to ECM. Check ECM's ability to respond to a 5 volt signal on MAP input. A reading of 106-109 KPA means wiring and ECM are okay.
2. Check for 5 volt reference present at sensor connector.
3. Check for circuit No. 432 shorted to ground.
4. Check for ECM ability to respond to a 5 volt signal voltage on MAP input.
5. Fault is most likely at ECM connector or ECM. Before ECM is replaced, perform PERFORMANCE CHART 1 - ECM REPLACEMENT CHECK at the end of this article.