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Home › Lexus › 2002 › SC 430 › Repair and Diagnosis › Transmission › Automatic Trans › Electronic Controlled Automatic Transmission (ECT) - Diagnosis › Transmission Control Switch Circuit › Inspection Procedure

Inspection Procedure

  1. CHECK OPERATION OF TRANSMISSION CONTROL SWITCH 

    Check shift indicator light when the shift lever is in the each position.

    1. OK: 
    SHIFT LEVER POSITION AND INDICATOR LIGHT CONDITION DESCRIPTIONS

    Shift lever position Specified condition
    D "D" indicator light comes on
    Except D "D" indicator light goes off
    4 "4" indicator light comes on
    Except 4 "4" indicator light goes off
    2 "2" indicator light comes on
    Except 2 "2" indicator light goes off
    L "L" indicator light comes on
    1. OK: Go to step   4 
    2. NG: Go to next step. 
  2. INSPECT TERMINAL VOLTAGE 
    1. Check voltage between each terminals of D, 4, 2 and L of ECM and E1 of ECM.
      Fig 1: Checking Voltage Between ECM Terminals
      G03386486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOM TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    2. NG: Go to next step. 
  3. CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER) 
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: CHECK AND REPLACE ECM 
  4. INSPECT SHIFT LOCK CONTROL ECU SUB-ASSY 
    1. Disconnect the shift lock control unit assembly.
    2. Check continuity between each terminal of shift lock control unit connector.
    SHIFT POSITION AND SHIFT LOCK CONTROL UNIT CONNECTOR TERMINAL CONTINUITY SPECIFICATIONS

    Shift position Tester connection Specified value
    D 2 - 10 (AT4 - NSSD) No continuity
    4 Continuity
    2 3 - 6 (NSSL - ATL) No continuity
    L Continuity
    Fig 2: Identifying Shift Lock Control Unit Connector Terminals
    G03386487Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: CHECK AND REPLACE SHIFT LOCK CONTROL ECU SUB-ASSY 
    2. OK: CHECK AND REPLACE COMBINATION METER ASSY 
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