Pinout Values and Diagnostic Parameters

AIR CONDITIONING SYSTEM:

TERMINALS OF ECU

1. INSPECT AIR CONDITIONER AMPLIFIER ASSEMBLY
(a) Disconnect the connector from the air conditioner amplifier assembly and inspect the connector on the wire harness side, as shown in the table below.









If the results are not as specified, inspect the circuits connected to the other parts.
(b) Connect the connector to the air conditioning amplifier assembly and inspect the wire harness side connector from the back side, as shown in the table below.













If the results are not as specified, replace the air conditioning amplifier assembly with a new one. If the results are still not as specified after replacing the air conditioning control assembly, inspect the circuits connected to other parts.





(1) WAVEFORM 1:
Magnet clutch signal





HINT: The wavelength becomes shorter as the engine rpm increases.

2. Inspect ECM (2TR-FE)
(a) Connect the connector to the ECM and inspect the wire harness side connector from the back side, as shown in the table below.













(1) WAVEFORM 1:
Engine coolant temperature sensor signal





A changes in accordance with the engine coolant temperature.









(2) WAVEFORM 2:
Engine speed signal





HINT: The wavelength becomes shorter as the engine rpm increases.

3. INSPECT ECM (1GR-FE)
(a) Connect the connector to the ECM and inspect the wire harness side connector from the back side, as shown in the table below.













(1) WAVEFORM 1:
Engine coolant temperature sensor signal





A changes in accordance with the engine coolant temperature.









(2) WAVEFORM 2:
Engine speed signal





HINT: The wavelength becomes shorter as the engine rpm increases.