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Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the C24 ECM connector.
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      C24-104 (E1) - Body ground Below 1 Ω
    3. Reconnect the ECM connector.
      4. Fig 1: Identifying ECM Connectors
      G04973315Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  2. INSPECT ENGINE ROOM J/B (EFI RELAY VOLTAGE) 
    1. Remove the engine room J/B from the engine room R/B.
    2. Disconnect the 1E engine room J/B connector.
    3. Turn the ignition switch to the ON position.
    4. Measure the voltage between the terminals.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      1E-12 -Body ground 9 to 14 V
    5. Reconnect the engine room J/B connector.
    6. Reinstall the engine room J/B.
      7. Fig 2: Inspecting Engine Room J/B (EFI Relay Voltage)
      G04973316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:  Go to step  4

    NG: Go To Next Step 

  3. INSPECT FUSE (EFI MAIN FUSE) 
    1. Inspect the EFI MAIN fuse.
      1. Remove the EFI MAIN fuse from the engine room R/B.
      2. Measure the EFI MAIN fuse resistance.

        Standard resistance: 

        Below 1 Ω 

      3. Reinstall the EFI MAIN fuse.
      2. Fig 3: Identifying EFI MAIN Fuse
      G04973317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FUSE (EFI MAIN FUSE) 

    OK: CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - EFI RELAY) 

  4. INSPECT ENGINE ROOM J/B (EFI RELAY) 
    1. Remove the engine room J/B from the engine room R/B.
    2. Inspect the EFI relay.
      1. Measure the EFI relay resistance.

        Standard resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Specified Condition
        1E-6 - 1E-12 10 kΩ or higher
        Below 1 Ω (Apply battery voltage between terminals 1E-9 and 1E-11)
    3. Reinstall the engine room J/B.
      4. Fig 4: Inspecting Engine Room J/B (EFI Relay)
      G04973318Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE ENGINE ROOM J/B 

    OK: Go To Next Step 

  5. INSPECT FUSE (EFI NO. 2 FUSE) 
    1. Inspect the EFI No. 2 fuse.
      1. Remove the EFI No. 2 fuse from the engine room R/B.
      2. Measure the EFI No. 2 fuse resistance.

        Standard resistance: 

        Below 1 Ω 

      3. Reinstall the EFI No. 2 fuse.
      Fig 5: Identifying EFI No. 2 Fuse
      G04973319Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FUSE (EFI NO. 2 FUSE) 

    OK: Go To Next Step 

  6. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM) 
    1. Disconnect the A24 ECM connector.
      Fig 6: Identifying ECM Connectors
      G04973320Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the engine room J/B from the engine room R/B.
    3. Disconnect the 1E engine room J/B connector.
    4. Measure the resistance between the terminals.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART (FOR OPEN)

      Tester Connection Specified Condition
      A24-2(+B) - 1E-6 Below 1 Ω
      A24-1(+B2) - 1E-6 Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART (FOR SHORT)

      Tester Connection Specified Condition
      A24-2 (+B) or 1E-6 - Body ground 10 kΩ or higher
      A24-1 (+B2) or 1E-6 - Body ground 10 kΩ or higher
    5. Reconnect the ECM connector.
    6. Reconnect the engine room J/B connector.
    7. Reinstall the engine room J/B.
      8. Fig 7: Identifying Engine Room J/B And Engine Room R/B
      G04973316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  7. INSPECT ECM (IGSW VOLTAGE) 
    1. Disconnect the A24 and C24 ECM connectors.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage between the terminals of the A24 and C24 ECM connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A24-28 (IGSW) - C24-104 (E1) 9 to 14 V
      Fig 8: Inspecting ECM (IGSW Voltage)
      G05558490Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the ECM connectors.

    OK:  Go to step  10

    NG: Go To Next Step 

  8. INSPECT FUSE (IGN FUSE) 
    1. Remove the IGN fuse from the instrument panel J/B.
    2. Measure the fuse resistance.

      Standard resistance: 

      Below 1 Ω 

    3. Reinstall the fuse.
      4. Fig 9: Identifying IGN Fuse
      G04973323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FUSE (IGN FUSE) 

    OK: Go To Next Step 

  9. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Disconnect the E23 ignition switch connector.
    2. Measure the resistance between the terminals.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Ignition Switch Position Specified Condition
      All Terminals LOCK 10 kΩ or higher
      2 - 4 ACC Below 1 Ω
      1 - 2 - 4, 5 - 6 ON
      1 - 3 - 4, 5 - 6 - 7 START
    3. Reconnect the ignition switch connector.
      4. Fig 10: Identifying Ignition Switch Connectors
      G04973181Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE IGNITION SWITCH ASSEMBLY 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM, EFI RELAY - BODY GROUND) 
    1. Disconnect the A24 ECM connector.
      Fig 11: Identifying ECM Connectors
      G04973325Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the engine room J/B from the engine room R/B.
    3. Disconnect the 1E engine room J/B connector.
    4. Measure the resistance between the terminals.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART (FOR OPEN)

      Tester Connection Specified Condition
      A24-44(MREL) - 1E-9 Below 1 Ω
      1E-11 - Body ground Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART (FOR SHORT)

      Tester Connection Specified Condition
      A24-44 (MREL) or 1E-9 - Body ground 10 kΩ or higher
    5. Reconnect the ECM connector.
    6. Reconnect the engine room J/B connector.
    7. Reinstall the engine room J/B.
      8. Fig 12: Disconnecting 1E Engine Room J/B Connector
      G04973316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM (See  REMOVAL   ) 

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