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