Code 6-2 Barometric Pressure Switch
- Make sure that the barometric pressure switch connector is mated correctly with wiring harness connector. If not, reconnect and repeat FUNCTIONAL TEST.
- Determine local altitude. Below 3500 ft., switch is normally open. Above 4000 ft., switch is normally closed. DO NOT test switch at altitudes between 3500 and 4000 ft. as switch may be in either condition. Disconnect harness connector from switch. Connect ohmmeter across switch terminals.
- If resistance is greater than 10 ohms at altitudes above 4000 ft. or less than 1K ohms below 3500 ft., replace switch and repeat test. If resistance is less than 10 ohms at altitudes above 4000 ft. or more than 1K ohms below 3500 ft., go to next step.
- Disconnect MCU harness connector. Check wires leading from MCU Pin No.s 14 and 6 to switch for continuity. If resistance of either wire is less than 10 ohms, replace MCU and re-test. If resistance is over 10 ohms in either wire, repair open circuit, and re-test.