Component Test

Skew Sensor Test 

1. Ignition OFF, remove the vacuum source from the sensor.
2. Ignition ON, observe and record the scan tool sensor pressure parameter. This is the first sensor reading.
3. With the J 23738-A  or the J 35555  , apply 5 in Hg (17 kPa) of vacuum to the sensor. Observe and record the scan tool sensor pressure parameter. This is the second sensor reading.
4. Subtract the second sensor reading from the first sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.
   • If the vacuum decrease is not within the specified range, replace the sensor
5. With the J 23738-A  or the J 35555  , apply 10 in Hg (34 kPa) of vacuum to the sensor. Observe and record the scan tool sensor pressure parameter. This is the third sensor reading.
6. Subtract the third sensor reading from the first sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.
   • If the vacuum decrease is not within the specified range, replace the sensor

Erratic Signal Test 

1. Ignition OFF, remove the affected sensor.
2. Install a 3A fused jumper wire between the 5-volt reference terminal C of the sensor and 5-volt reference.
3. Install a jumper wire between the low reference terminal A of the sensor and ground.
4. Install a jumper wire at the signal terminal B sensor.
5. Connect a DMM between the jumper wire from terminal of the sensor and ground.
6. Ignition ON, with the J 23738-A  or the J 35555  See Special Tools . Slowly apply vacuum to the sensor while monitoring the voltage on the DMM. The voltage should vary between 0-5.2 volts, without any spikes or dropouts.
   • If the voltage is not within the specified range or is erratic, replace the affected sensor.