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Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the C24 ECM connector.
      Fig 1: Identifying ECM Connectors
      G04973315Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      C24-104 (E1) - Body ground Below 1 Ω
    3. Reconnect the ECM connector.

      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.
      Fig 2: Disconnecting 1E Engine Room J/B Connector
      G04973316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Turn the ignition switch to the ON position.
    4. Measure the voltage between the terminals.

      Standard voltage 

      VOLTAGE SPECIFICATION

      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.

      OK: Go to step   4

      NG: Go to next step 

  3. INSPECT FUSE (EFI MAIN FUSE) 
    1. Inspect the EFI MAIN fuse.
      Fig 3: Identifying EFI MAIN Fuse
      G04973317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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.

        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. Fig 4: Identifying 1E Engine Room J/B Connector
      G04973318Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Inspect the EFI relay.
      1. Measure the EFI relay resistance.

        Standard resistance 

        RESISTANCE SPECIFICATION

        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.

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

        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.
      Fig 7: Disconnecting 1E Engine Room J/B Connector
      G04973316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance between the terminals.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFICATION

      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) 

      RESISTANCE SPECIFICATION

      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.

      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.
      Fig 8: Identifying ECM Connectors
      G04973322Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 

      VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      A24-28 (IGSW) - C24-104 (E1) 9 to 14 V
    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.
      Fig 9: Identifying IGN Fuse
      G04973323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the fuse resistance.

      Standard resistance: Below 1 Ω 

    3. Reinstall the fuse.

      NG: REPLACE FUSE (IGN FUSE) 

      OK: Go to next step 

  9. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Disconnect the E23 ignition switch connector.
      Fig 10: Identifying Ignition Switch Connectors
      G04973181Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals.

      Standard resistance 

      RESISTANCE SPECIFICATION

      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.

      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.
      Fig 12: Disconnecting 1E Engine Room J/B Connector
      G04973316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance between the terminals.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFICATION

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

      Standard resistance (Check for short) 

      RESISTANCE SPECIFICATION

      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.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE ECM 

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