Barometric Pressure Sensor: Testing and Inspection

(Fault code 2223)

NOTE: The altitude sensor sends a voltage signal based on altitude. A barometric element inside the sensor reacts to changes in air pressure and moves an electrical contact across a resistance track. This signal is used by the fuel injection control unit to correct the fuel mixture in relation to altitude or air pressure changes. The ignition control unit also uses this signal to correct the ignition timing during certain engine load ranges at higher altitudes.

- remove kick panel from left driver side footwell
- remove knock sensor ignition control unit and disconnect 25 pin harness connector





- remove harness connector from altitude sensor (arrow)

NOTE: The altitude sensor is attached to the mounting bracket for the ignition control unit behind the left kick panel.





- connect multimeter US 1119 between terminal 1 and engine ground
- switch ignition ON
- specification: approximately 5 volts





If specification is NOT obtained
- repair break in wiring between fuel injection control unit terminals 1 and 25 using wiring diagram or replace fuel injection control unit
- connect multimeter US 1119 between terminals 1 and 3 and then between terminals 2 and 3
- switch ignition ON
- specification: 4.5 - 5 volts

If specification is NOT obtained
- repair break in wiring according to wiring diagram or replace fuel injection control unit
- check wiring between knock sensor ignition control unit and altitude sensor according to wiring diagram

If all specifications ARE obtained
- replace altitude sensor