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Home >> Lexus >> 2007 >> GX 470 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - System And Circuit Testing, On-Vehicle Inspection, Removal, Inspection, Installation >> Cranking Holding Function Circuit >> Inspection Procedure
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Inspection Procedure

  1. CHECK OPERATION OF ENGINE CRANKING 
    1. When turning the ignition switch to the START position, check if the starter motor starts.

    OK: CHECK FOR INTERMITTENT PROBLEMS 

    NG: Go to next step 

  2. READ VALUE OF INTELLIGENT TESTER (STA SIGNAL) 
    1. Connect the intelligent tester to the DLC3 with CAN VIM.
    2. Enter the following menu: DIAGNOSIS / ENHANCED OBD-II / DATA LIST / ALL / STARTER SIG.
    3. Confirm the starter signal status when the ignition switch is operated.

      OK 

      IGNITION SWITCH SPECIFICATION

      Ignition Switch Position STARTER SIG
      ON OFF
      Start ON

    OK:  Go to step  5

    NG: Go to next step 

  3. INSPECT ECM (STA AND STSW VOLTAGE) 
    Fig 1: Identifying E7 ECM Connector Terminals
    G05264292Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    1. Measure the voltage of the E7 ECM connector while cranking the engine (ignition switch is in the START position).

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      STA (E7-11) - E1 (E7-1) 9 to 14 V
      STSW (E7-12) - E1 (E7-1)

      Result 

      RESULT REFERENCE

      Terminal STSW Terminal STA Proceed to
      9 to 14 V 9 to 14 V A
      0 V B
      0 V C

    B: REPLACE ECM 

    C:  Go to step  9

    A: Go to next step 

  4. INSPECT PARK/NEUTRAL POSITION SWITCH 
    Fig 2: Identifying P1 Park/Neutral Position Switch Connector Terminal
    G05264293Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    1. Disconnect the P1 park/neutral position switch connector.
    2. Measure the resistance between each terminal shown below when the shift lever is moved to each position.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Shift Position Tester Connection Specified Condition
      P 2 - 6, 4 - 5 Below 1 Ω
      R 1 - 2
      N 2 - 9, 4 - 5
      D,4 2 - 7
      3 2 - 3
      2-L 2 - 8
    3. Reconnect the park/neutral position switch connector.

    NG: REPLACE PARK/NEUTRAL POSITION SWITCH 

    OK: CHECK AND REPAIR HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM) 

  5. INSPECT STARTER RELAY 
    Fig 3: Identifying Starter Relay Terminals
    G04967794Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    1. Remove the starter relay from the engine room R/B
    2. Measure the resistance of the starter relay.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (when battery voltage applied to terminals 1 and 2)
    3. Reinstall the starter relay.

    NG: REPLACE STARTER RELAY 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (PARK / NEUTRAL POSITION SWITCH - STARTER RELAY, STARTER RELAY - BODY GROUND) 
    1. Check the harness and the connector between the park/neutral position switch connector and the starter relay.
      Fig 4: Identifying P1 Park/Neutral Position Switch Connector Terminal
      G04968196Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      1. Disconnect the P1 park/neutral position switch connector.
      2. Remove the starter relay from the engine room R/B.
      3. Measure the resistance between the wire harness side connectors.

        Standard resistance (Check for open) 

        RESISTANCE SPECIFICATION

        Tester Condition Specified condition
        Park/Neutral position switch (P1-5) - Starter relay (2) Below 1 Ω

        Standard resistance (Check for short) 

        RESISTANCE SPECIFICATION

        Tester Condition Specified condition
        Park/Neutral position switch (P1-5) or Starter relay (2) Body ground 10 kΩ or higher
      4. Reinstall the starter relay.
      5. Reconnect the park/neutral position switch.
    2. Check the harness and the connector between the starter relay and the body ground.
      1. Remove the starter relay from the engine room R/B.
      2. Measure the resistance between the starter relay and the body ground.

        Standard resistance (Check for open) 

        RESISTANCE SPECIFICATION

        Tester Condition Specified condition
        Starter relay (1) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE) 
      Fig 5: Identifying Starter Relay
      G04968197Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    1. Remove the starter relay from the engine room R/B.
    2. Measure the voltage of the engine room R/B and body ground.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      Engine room R/B (Starter relay terminal 5) - Body ground 9 to 14 V
    3. Reinstall the Starter relay.

    NG: CHECK AND REPAIR HARNESS AND CONNECTOR (STARTER RELAY - BATTERY) 

    OK: Go to next step 

  8. INSPECT STARTER ASSEMBLY 
    1. Inspect the starter assembly (See INSPECTION ).

    NG: REPAIR OR REPLACE STARTER ASSEMBLY 

    OK: CHECK AND REPAIR HARNESS OR CONNECTOR (STARTER RELAY - STARTER, STARTER - BATTERY) 

  9. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Remove the lower finish panel.
    2. Disconnect the I18 ignition switch connector.
    3. Measure the resistance of the connector terminals shown in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION TABLE

      Switch Position Tester Connection Specified Condition
      LOCK All terminals 10 kΩ or higher
      ACC 2 - 3 Below 1 Ω
      ON 2 - 3 2 - 4, 6 - 7
      START 1 - 2, 2 - 4 6 - 7, 6 - 8
      4. Fig 6: Identifying I18 Ignition Switch Connector Terminal
      G04967994Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    4. Reconnect the I18 ignition switch connector.

    NG: REPLACE IGNITION SWITCH ASSEMBLY 

    OK: CHECK AND REPAIR HARNESS OR CONNECTOR (ECM - IGNITION SWITCH, IGNITION SWITCH - BATTERY) 

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