Altitude Correction
- Connect meter adapter cable to differential pressure regulator. Set multimeter to mA scale. Disconnect O2 sensor and turn ignition on. Disconnect wiring from altitude sensor to simulate sea level operation. Current reading should be 7-9 mA.
- Reconnect altitude sensor wiring. Check current reading. See ALTITUDE CORRECTION FACTOR table for correct current readings at different barometric pressures and different elevations above sea level. If current readings are correct, test is complete.
- If readings are incorrect, disconnect altitude sensor. Check that voltage between socket No. 1 and ground is 6 volts. Voltage between sockets No. 2 and 3 should be 8 volts. If readings are correct, replace altitude sensor. If readings are incorrect, repair wiring.
ALTITUDE CORRECTION FACTOR
| Altitude Ft. (M) | Barometric Pressure psi (kg/cm2 ) | Control Current mA |
|---|---|---|
| 0 (0) | 14.69 (1.0) | 7-9 |
| 1640 (500) | 13.85 (.97) | 6-8 |
| 3281 (1000) | 13.04 (.91) | 5-7 |
| 6562 (2000) | 11.53 (.81) | 3-5 |