LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2008 >> FJ Cruiser 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> ECM Power Source Circuit >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

  1. INSPECT ECM (+B VOLTAGE) 
    1. Turn the ignition switch ON.
      Fig 1: Identifying B3 And E47 ECM Connector
      G05197973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      +B (E47-1) - E1 (B3-1) 11 to 14 V

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

    NG: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the B3 ECM connector.
      2. Fig 2: Identifying B3 ECM Connector
      G05108916Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      E1 (B3-1) - Body ground Below 1 Ω.
    3. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  3. INSPECT ECM (IGSW VOLTAGE) 
    1. Turn the ignition switch ON.
      Fig 3: Identifying E47 And B3 ECM Connectors
      G05108917Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      IGSW (E47-9) - E1 (B3-1) 11 to 14 V

    OK: Go to step   6

    NG: Go to next step 

  4. CHECK FUSE (IGN FUSE) 
    1. Remove the IGN fuse from the driver side junction block.
      2. Fig 4: Identifying IGN Fuse
      G05577539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the IGN fuse resistance.

      Standard Resistance: 

      Below 1 Ω 

    3. Reinstall the IGN fuse.

    NG: CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to Next Step 

  5. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Disconnect the A1 ignition switch connector.
      Fig 5: Identifying Resistance Between Terminals
      G05386765Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE

      Tester Connection Switch Condition Specified Condition
      All Terminals LOCK 10 kΩ or higher
      2 - 3 ACC Below 1 Ω
      2 - 3 - 4, 6 - 7 ON Below 1 Ω
      1 - 2 - 4, 6 - 7 - 8 START Below 1 Ω
    3. Reconnect the ignition switch connector.

    NG: REPLACE IGNITION SWITCH ASSEMBLY  (See REMOVAL )

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

  6. INSPECT ECM (MREL VOLTAGE) 
    1. Turn the ignition switch ON.
      Fig 6: Identifying B3 And E47 ECM Connectors
      G05108920Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      MREL (E47-8) - E1 (B3-1) 11 to 14 V

    NG: REPLACE ECM  (See REMOVAL  )

    OK: Go to Next Step 

  7. CHECK FUSE (EFI FUSE) 
    1. Remove the EFI fuse from the engine room relay block.
      2. Fig 7: Identifying EFI Fuse
      G05577542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the EFI fuse resistance.

      Standard Resistance: Below 1 Ω. 

    3. Reinstall the EFI fuse.

    NG: CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to Next Step 

  8. INSPECT EFI RELAY 
    1. Remove the EFI relay from the engine room relay block.
      2. Fig 8: Identifying EFI Relay
      G04942976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

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

    NG: REPLACE EFI RELAY 

    OK: Go to Next Step 

  9. CHECK HARNESS AND CONNECTOR (EFI RELAY- ECM, EFI RELAY - BODY GROUND) 
    1. Check the harness and connector between the EFI relay and ECM.
      Fig 9: Identifying EFI Relay And E47 ECM Connector
      G05577544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the EFI relay from the engine room relay block.
      2. Disconnect the E47 ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        EFI relay (1) - MREL (E47-8) Below 1 Ω

        Standard Resistance (Check for short) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        EFI relay (1) or MREL (E47-8) - Body ground 10 kΩ or higher
      4. Reinstall the EFI relay.
      5. Reconnect the ECM connector.
    2. Check the harness and connector between the EFI relay and body ground.
      1. Remove the EFI relay from the engine room relay block.
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        EFI relay (2) - Body ground Below 1 Ω
      3. Reinstall the EFI relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK AND REPAIR HARNESS AND CONNECTOR (TERMINAL +B OF ECM - BATTERY POSITIVE TERMINAL) 

scientia non olet · About LEMON Manuals