Manifold Pressure/Vacuum Sensor: Testing and Inspection

Fig. 8 Pressure Sensor Specification Chart.:

Fig. 9 Pressure Sensor Specification Chart.:

1. Connect ECU test harness.
2. Proceed as follows:
a. Measure voltage between terminals 6 and 39.
b. Refer to Fig. 9 for voltage specification.
c. If voltage does not conform to specification, measure voltage between terminals 5 and 36 on the ECU test harness.
d. Ensure voltage is 4.5-5.5 volts, then replace pressure sensor. When pressure sensor is replaced it is necessary to replace the fuel and air filter.
e. If voltage between terminals 5 and 36 is not 4.5-5.5 volts, check wiring between ECU and pressure sensor.
f. Apply 7.87 inches of vacuum to the pressure sensor.
g. Ensure voltage between terminals 6 and 39 drops by .65-.95 volts.
h. If voltage does not drop as specified, replace the pressure sensor.
3. Perform Pressure sensor test.

Fig. 55 ECU System Diagnosis, Pressure Sensor Check (Part 1 Of 2):

Fig. 55 ECU System Diagnosis, Pressure Sensor Check (Part 2 Of 2):