Atmospheric Pressure Sensor (Pa Sensor)
- Disconnect control unit wiring harness connector and install system checker harness. Turn ignition on. Connect digital voltmeter positive probe to C9 terminal of system checker harness and negative probe to C12 terminal. There should be 2.76-2.96 volts. See Fig 1 .
- If voltages are out of specifications, check for open or short circuit between ECU and atmospheric pressure sensor. Replace sensor if necessary.