Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information EFI-225

Condition




Diagnostic trouble code (DTC) EFI-225 (Air conditioning (A/C) pressure sensor, signal is stored if the engine control module (ECM) receives a signal from the air conditioning (A/C) pressure sensor corresponding to a pressure above 3100 kPa (approximately 31 bar) (signal high) or below -81 kPa (approximately -0.08 bar) (signal low).
When the engine is started with an engine temperature below +40°C air conditioning (A/C) pressure should rise by at least 95-kPa within 8 seconds. Diagnostic trouble code (DTC) EFI-225 (faulty signal) is stored if pressure does not rise sufficiently.

Substitute value
- the engine control module (ECM) adopts a substitute value of 13.5 kPa when the air conditioning (A/C) compressor is running
- engine cooling fan (FC) fan runs at low-speed.

Possible source

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

Signal too low:
- short-circuit to ground in signal cable
- defective fuse 11B/5 (1998-)
- open-circuit in power cable
- short-circuit to ground in power cable
- short-circuit to ground in fuel tank pressure sensor power cable
- short-circuit to ground in atmospheric pressure sensor power cable
- short-circuit to ground in accelerometer power cable
- defective fuel tank pressure sensor
- defective atmospheric pressure sensor
- defective accelerometer
- defective air conditioning (A/C) pressure sensor

Faulty signal:
- defective air conditioning (A/C) pressure sensor
- incorrect pressure in air conditioning (A/C) system.
- open-circuit in signal cable between pressure switch (Pressostat) and A/C compressor
- defective solenoid clutch/compressor

Fault symptom[s]
- air conditioning (A/C) compressor not running.