DFI ECM Tests W/Codes: Action:

The ECM turns on "ENGINE CONTROL SYSTEM" light. ECM commands BCM to display the "SERVICE NOW" message on CCDIC panel. ECM turns off both AIR management solenoids. ECM uses a substitute MAP sensor value of 81.8 kPa with open throttle switch. ECM uses a substitute MAP value from a MAP versus RPM table if throttle switch is closed. ECM uses a substitute barometric pressure value of 92.2 kPa.

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 is designed to set when 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).

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

This step 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.
This step checks for 5-volt reference signal present at sensor connector.
This step checks circuit No. 432 for short to ground.
This step checks ECM's ability to respond to a 5-volt signal voltage on MAP input.
Fault is most likely at ECM connector or ECM. See CHART C1 - ECM REPLACEMENT CHECK, before ECM is replaced.