DTC 32

Fig. 24 Manifold absolute pressure sensor & barometric pressure sensor wiring circuit. 1984:

Fig. 25 Manifold absolute pressure sensor & barometric pressure sensor wiring circuit. 1985:

If this code is not displayed during the third pass of diagnostic codes, the problem is an intermittent failure. To help isolate the problem, manipulate related wiring while observing parameter .0.2. If failure is induced, MAP reading will jump from its normal value to an open reading of 14 to 16 kPa.
The ECM supplies five volts to the manifold absolute pressure sensor (MAP) through circuit 474 and supplies a five volt ground line through circuit 476. The MAP sensor signal from pin B is a variable voltage that changes depending on engine load. Trouble code 32 indicates that the voltage signal from the MAP sensor is too low. A low MAP signal may be caused by the following:
a. Defective MAP sensor.
b. Defective wiring or electrical connectors.
c. ECM unable to process the MAP signal.
1. Turn ignition on, enter diagnostics and display parameter .0.2. Value of parameter .0.2 should be 14 to 16 kPa.
2. Disconnect sensor connector and place suitable jumper across pins B and C.
3. If value of parameter .0.2 is 106 to 108 kPa, check mating of sensor terminals and condition of MAP sensor. Repair or replace as necessary.
4. If value of parameter .0.2 is 105 kPa or less, remove jumper wire and connect a suitable voltmeter between pin C and ground. If no voltage is observed, inspect circuit 474 for an open or shorted condition and repair as necessary.
5. If voltmeter reads 5 volts, measure voltage between pins B and C. If this voltage measures 5 volts, inspect circuit 432 for short to ground or to circuit 476 X & Y and repair as necessary. If wiring is satisfactory, fault is in ECM or ECM connector.
6. If voltmeter reads 0 volts, connect jumper wire across pin 20 in blue connector and pin 11 in red connector. If value of parameter .0.2 is 106 to 108, inspect circuit 432 for an open and repair as necessary. If value of parameter .0.2 is 105 or less, fault is in the ECM or ECM connector.