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Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check voltage between terminal ACMG of ECM connector and body ground. 

    PREPARATION: 

    Remove the ECM with connector still connected.

    CHECK: 

    1. Start the engine.
    2. Push AUTO SW.
    3. Measure voltage between terminal ACMG of ECM connector and body ground when A/C switch is ON and OFF.

    OK: 

    A/C VOLTAGE SPECIFICATION

    A/C switch Voltage
    ON 10 - 4 V
    OFF 0 V
    Fig 1: Identifying Terminal ACMG Of ECM Connector And Body Ground
    G03376806Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : Go to step   3 . 
    2. NG : Go to next step. 
  2. Check magnetic clutch relay. 

    PREPARATION: 

    Remove magnetic clutch relay from engine room J/B.

    CHECK: 

    Check continuity between each pair of terminals shown below of magnetic clutch relay.

    OK: 

    TESTER CONDITION SPECIFICATION

    Tester connection Specified condition
    1 - 2 62.5 - 90.9 Ω
    3 - 5 No continuity
    Fig 2: Identifying Magnetic Clutch Relay
    G03376807Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

    Apply battery positive voltage between terminals 1 and 2.

    CHECK: 

    Check continuity between terminals 3 and 5.

    OK: 

    Continuity exists 

    1. NG : Replace magnetic clutch relay. 
    2. OK : Go to next step. 
  3. Check A/C compressor magnetic clutch. 

    PREPARATION: 

    Disconnect magnetic clutch connector.

    CHECK: 

    Connect positive (+) lead connected to battery to magnetic clutch connector terminal 3.

    OK: 

    Magnetic clutch is energized. 

    Fig 3: Identifying A/C Compressor Magnetic Clutch
    G03376808Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Repair or replace A/C compressor magnetic clutch. 
    2. OK : Go to next step. 
  4. Check harness and connector between magnetic clutch relay and ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Go to next step. 
  5. Check harness and connector between ECM and A/C compressor (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Check and replace ECM and A/C ECU. 
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