P032

Code PO32:

Sensor Circuit:

DESCRIPTION
The Manifold Absolute Pressure (MAP) sensor is a sensor that changes resistance based upon manifold vacuum. The Powertrain Control Module (PCM) provides a 5.0 volt reference and ground. The MAP sensor signal varies between ground and 5.0 volts as manifold vacuum varies. As MAP decreases, voltage decreases (low engine load, high vacuum). As MAP increases, voltage increases (high engine load, low vacuum). The PCM uses the MAP sensor values as an indicator of engine load. Code P032 sets when the PCM detects a MAP sensor signal that is too low.

TEST CONDITIONS
CONDITION 1:

1. RPM 700 or less.
2. Throttle Position (TP) sensor 18 degrees or less.

CONDITION 2:

1. RPM 1800 or less.
2. TP sensor 13 degrees or greater.
3. Transaxle not in Park or Neutral.

FAILURE CONDITIONS
MAP 15 kPa or less for 0.15 seconds.

ACTION TAKEN
1. PCM turns "ON" the "Service Engine Soon" Malfunction Indicator Lamp (MIL).
2. PCM sets BARO to 92 kPa.
3. PCM uses a substitute MAP value based on engine rpm and throttle position switch status (open or closed).
4. PCM disables long term fuel trim.

NOTES ON FAULT TREE
1. Checking if circuitry from sensor to PCM is able to respond to a 5.0 volt signal on MAP input. A reading of 106-109 means wiring and PCM are OK.

2. Checking for 5.0 volts at sensor connector.

3. Checking for CKT 432 shorted to ground.

4. Checking for PCM able to respond to a 5.0 volt signal voltage on MAP input.

5. Fault is most likely at PCM connector or PCM. Before PCM is replaced, check for damaged pins or poor connection.

NOTES ON INTERMITTENTS
Manipulate MAP sensor connector, MAP wiring, and PCM connector while observing PCM data PD02. Apply and release vacuum to the MAP sensor vacuum port using a vacuum source. If the PCM data PD02 immediately jumps to less than 15 kPa, repair intermittent MAP sensor fault. If wiring and connector check out OK, substitute a known good MAP sensor and retest.