Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information EFI-422

Condition




Diagnostic trouble code (DTC) EFI-422 is stored if the engine control module (ECM) receives a signal from the atmospheric pressure sensor corresponding to a height above sea level of over 6.500 m (low signal) or under 780 m (high signal).
Diagnostic trouble code (DTC) EFI-422 is stored if the signal is unstable for 25 seconds (sporadic signal).

Substitute value
- the engine control module (ECM) adopts a height of 0 m above sea level.

Possible source

Signal too high
- short-circuit to supply voltage in the signal cable
- open-circuit in signal cable or ground lead
- short-circuit to supply voltage in the power cable
- contact resistance in terminals
- short-circuit to supply voltage in air conditioning (A/C) pressure sensor power cable
- short-circuit to supply voltage in fuel tank pressure sensor power cable
- short-circuit to supply voltage in accelerometer power cable
- defective atmospheric pressure sensor

Signal too low
- short-circuit to ground in signal cable
- short-circuit to ground in power cable
- open-circuit in power cable
- contact resistance in terminals
- short-circuit to ground in air conditioning (A/C) pressure sensor
- short-circuit to ground in fuel tank pressure sensor power cable
- short-circuit to ground in accelerometer power cable
- defective atmospheric pressure sensor
- defective air conditioning (A/C) pressure sensor
- defective fuel tank pressure sensor.
- defective accelerometer.

Signal sporadic:
- loose connections
- contact resistance in terminals
- defective atmospheric pressure sensor
- defective air conditioning (A/C) pressure sensor
- defective fuel tank pressure sensor.
- defective accelerometer.

Fault symptom[s]
- poor performance at high altitude
- can cause starting problems at high altitude.