DTC EFI-225

2-2-5 A/C PRESSURE SENSOR SIGNAL





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 3,100 kpa (approx. 31 bar) (440 psi) (high signal) or below -81 kPa (approx. -0.08 bar) (-11.5 psi). When the engine is started with an engine temperature below +40°C (104°F), air conditioning (A/C) pressure should rise by at least 95 kPa (13.5 psi) 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 (1.4 Psi) when the Air Conditioning (A/C) compressor is running
- Engine Cooling Fan (FC) fan runs at low-speed.

Possible Source(s)

Signal Too High

- Short-circuit to supply voltage in the signal cable
- Open-circuit in signal or ground lead
- Contact resistance in terminals
- Defective air conditioning (A/C) pressure sensor.

Signal Too Low

- Short-circuit to ground in signal cable
- 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 working.