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Vacuum Sensor
- Remove vacuum hose and attach a vacuum pump to sensor. Turn ignition on. Check voltage between each terminal and ground while applying and releasing 30 in. Hg to sensor. See Figure
.
VACUUM SENSOR TERMINAL VOLTAGE
| Terminal |
Voltage |
| "A" |
Less Than 1.5 |
| "B" |
4.5-5.5 |
| "C" |
12 |
| "D" |
1.4-4.9 |
- If voltages at terminal "A", "B", or "C" is not within specifications, check wiring harness to sensor. If voltages at terminal "A", "B", or "C" is within specifications, but terminal "D" is not within specifications, replace vacuum sensor.