Description and Diagnosis Procedure

SYSTEM: A/C Cut Control Circuit

CIRCUIT DESCRIPTION
This circuit cuts air conditioning operation during vehicle acceleration in order to increase acceleration performance. During acceleration with the vehicle speed at 25 km/h (16 mph) or less, engine speed at 1600 rpm or less and throttle valve opening angle at 60° or more, the A/C magnet switch is turned OFF for several seconds.





DIAGNOSTIC PROCEDURE USING LEXUS HAND HELD TESTER
1. Connect the LEXUS hand~held tester and check operation of air conditioning cut control.
- If not OK proceed to step 2.
- If OK proceed to DIAGNOSIS BY SYMPTOM.
2. Check for open and short in harness and connector between Engine Control Module and A/C amplifier.
- If OK proceed to step 3.
- If not OK repair or replace harness or connector.
3. Check voltage terminal ACT.
- If OK check and replace Engine Control Module.
- If not OK check and replace A/C amplifier.

DIAGNOSTIC PROCEDURE USING OBDII SCAN TOOL
1. Check voltage terminal ACT.
- If not OK proceed to step 2.
- If OK check and replace Engine Control Module.
2. Check for open and short in harness and connector between Engine Control Module and A/C amplifier.
- If OK check and replace A/C amplifier.
- If not OK repair or replace harness or connector.