ECM Code EO32: Open Map Sensor Circuit: Action:

ECM turns on SERVICE ENGINE SOON light. ECM uses a substitute MAP value from a MAP versus RPM table when throttle switch is closed. ECM uses a substitute barometric pressure value of 92 kPa.

The MAP sensor output voltage is a D 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 is designed to set when ECM detects a MAP sensor signal out of low limits.

NOTE: Test numbers refer to test numbers on diagnostic chart.

Test Number 1) This checks 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.

Test Number 2) This checks for 5-volt reference signal present at sensor connector.

Test Number 3) This checks circuit No. 432 for short to ground.

Test Number 4) This checks ECM's ability to respond to a 5-volt signal voltage on MAP input.

Test Number 5) Fault is most likely at ECM connector or ECM. See CHART C1, ECM REPLACEMENT CHECK, before ECM is replaced.