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Home >> Lexus >> 2004 >> GS 300 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - Diagnostics >> Circuit Inspection >> Transmission Shift Switch Circuit >> Inspection Procedure
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Inspection Procedure

  1. Check transmission shift switch. 

    PREPARATION: 

    1. Remove the steering wheel pad.
    2. Disconnect the transmission shift switch connector.

    CHECK: 

    Check continuity between each terminal of transmission shift switch connector.

    Fig 1: Checking Transmission Shift Switch
    G01484242Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    Fig 2: Transmission Shift Switch Continuity
    G01484243Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Replace the steering wheel. 
    2. OK: Go to Next Step 
  2. Check voltage between each of terminals SFTU, SFTD and E1 of ECM. 

    PREPARATION: 

    1. Turn ignition switch ON.
    2. Remove the ECM with connectors still connected.

    CHECK: 

    Check voltage between each terminals of SFTU or SFTD and E1 of ECM.

    Fig 3: Identifying Terminals SFTU, SFTD & E1 Of ECM
    G01484244Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    Fig 4: Terminals SFTU, SFTD & E1 Of ECM Voltage Chart
    G01484245Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 
    2. NG: Go to next step. 

      Repair or replace harness or connector (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ).