Barometric Pressure 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 9 and 29.
b. Refer to Fig. 8 for voltage specification.
c. If voltage does not conform to specification, measure voltage between terminals 31 and 29 on the ECU test harness.
d. Ensure voltage is 4.5-5.5 volts, then replace pressure sensor. When the pressure sensor is replaced it is necessary to replace the fuel and air filter.
e. If voltage between terminals 31 and 29 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 9 and 29 drops by .55 volts.
h. If voltage does not drop as specified, replace the pressure sensor.
3. Perform Pressure Sensor circuit test.

Fig. 43 ECU System Diagnosis, Pressure Sensor Check (Part 1 Of 2):

Fig. 43 ECU System Diagnosis, Pressure Sensor Check (Part 2 Of 2):