Pinout Values and Diagnostic Parameters

AIR CONDITIONING: AIR CONDITIONING SYSTEM: TERMINALS OF ECU

TERMINALS OF ECU

1. Air conditioning amplifier





















(*1): Limited grade
(*2): SR-5 grade
2. Air conditioning control assembly









3. ECM









(*3): 2UZ-FE
(*4): 1GR-FE





(a) Oscilloscope waveform 1:
Terminal to be measured: BLW of A/C amplifier
Setting for measurement: 2 V/DIV, 500 msec./DIV
Condition: Ignition switch ON





(b) Oscilloscope waveform 2:
Terminal to be measured: TWI of A/C amplifier and TWHO of ECM
Setting for measurement: 5 V/DIV, 0.1 sec./DIV
Condition: Ignition switch ON





(c) Oscilloscope waveform 3:
Terminal to be measured: MGC of A/C amplifier and ECM
Setting for measurement: 200 mV/DIV, 10 msec./DIV
Condition: Ignition switch ON