E032

ECM Code E032:

DFI Sensor Circuit:

DESCRIPTION:

The MAP sensor output voltage is a DC voltage that varies with Manifold Absolute Pressure (MAP). As MAP decreases, voltage on CKT 432 decreases (low engine load, high engine vacuum). As MAP increases, voltage on CKT 432 increases (high engine load, low engine vacuum).

Code E032 is designed is set when the ECM detects a MAP sensor signal out of limits low - MAP signal at 16 kPa or less, MAP voltage at .08 volts or less.

TEST CONDITIONS:

1. With ISC throttle switch closed, engine speed less than or equal to 700 RPM, TPS less than or equal to 12°.
2. With ISC throttle switch open, TPS greater than or equal to 9.6°.

FAILURE CONDITIONS:

MAP value less than 16 kPa.

ACTION TAKEN:

1. ECM illuminates "SERVICE ENGINE SOON" telltale.
2. ECM commands BCM to display "SERVICE CAR SOON" message on CCDIC.
3. Turn off both air solenoids.
4. ECM uses a substitute MAP sensor value of 81.8 kPa with open throttle switch.
5. ECM uses a substitute MAP value from a table of substitute MAP vs RPM when throttle switch is closed.
6. ECM uses a substitute BARO value of 92.2 kPa.

NOTES ON FAULT TREE:

1. Checking for circuitry from sensor to ECM able to respond to a 5 volt signal on MAP input. A reading of 106 to 109 means wiring and ECM are OK.

2. Checking for 5 volt reference present at sensor connector.

3. Checking for CKT 432 shorted to ground.

4. Checking for ECM able to respond to a 5 volt sigal voltage on MAP input.

5. Fault is most likely at ECM connector or ECM. Before replacing ECM, perform the "ECM Replacement Check", CHART C-1.

NOTE ON INTERMITTENTS:

Code E032 can be set by:

1. Open 5 volt reference between ECM and sensor.
2. Open in MAP signal between sensor and ECM.
3. Defective MAP sensor.

Manipulate affected wiring and connectors while observing ECM parameter ED02. Apply and release vacuum to the MAP sensor vacuum port using a vacuum source. If the ECM parameter ED02 displays less than 17 kPa, the condition has been induced and the cause of the intermittent can be repaired. If wiring and connectors check out OK, substitute a known good MAP sensor and retest.

Review the snapshot data parameters stored with this code to verify failure condition. If the failure condition is verified, check and repair intermittent wiring connection, or sensor.