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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (SFI) - Diagnostics (2AZ-FE)) >> ECM Power Source Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
  1. INSPECT ECM (+B VOLTAGE) 
    1. Turn the ignition switch ON.
    2. Measure the voltage between of the ECM connectors.
      Fig 1: Identifying ECM Connector Power & Ground Terminals
      G02908054Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      E5-1 (+B) - E9-1 (E1) 9 to 14 V
    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    2. NG: GO TO NEXT STEP. 
  2. CHECK WIRE HARNESS (ECM - BODY GROUND) 
    1. Disconnect the E9 ECM connector.
    2. Measure the resistance of the wire harness side connectors.
      Fig 2: Identifying E9 ECM Connector Resistance Test Terminal
      G02908055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      E9-1 (E1) - Body ground Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: GO TO NEXT STEP. 
  3. INSPECT ECM (IGSW VOLTAGE) 
    1. Turn the ignition switch ON.
    2. Measure the voltage of the ECM connectors.
      Fig 3: Identifying E9 And E5 ECM Connector Terminals
      G02908056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      E5-9 (IGSW) - E9-1 (E1) 9 to 14 V
    1. OK: Go to step   6 . 
    2. NG: GO TO NEXT STEP. 
  4. CHECK FUSE (IGN) 
    1. Remove the IGN fuse from the instrument panel J/B Assy.
    2. Measure the resistance of the IGN fuse.
      Fig 4: Locating IGN Fuse
      G02908057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: Below 1 Ω 

    1. NG: REPLACE FUSE 
    2. OK: GO TO NEXT STEP. 
  5. INSPECT IGNITION OR STARTER SWITCH ASSY 
    1. Measure the resistance of the ignition switch terminals.
      Fig 5: Identifying Ignition Switch Connector Terminals
      G02908058Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Switch Condition Tester Condition Specified Condition
      LOCK 6 (IG2) - 7 (AM2) 10 kΩ or higher
      ON 6 (IG2) - 7 (AM2) Below 1 Ω
    1. NG: REPLACE IGNITION OR STARTER SWITCH ASSY 
    2. OK: CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM) 
  6. INSPECT ECM (MREL VOLTAGE) 
    1. Turn the ignition switch ON.
    2. Measure the voltage of the ECM connectors.
      Fig 6: Identifying E9 And E5 ECM Connector Voltage Test Terminals
      G02908059Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      E5-8 (MREL) - E9-1 (E1) 9 to 14 V
    1. NG: REPLACE ECM (See  REPLACEMENT  ) 
    2. OK: GO TO NEXT STEP. 
  7. CHECK FUSE (EFI NO. 1) 
    1. Remove the EFI NO. 1 fuse from the engine room J/B.
    2. Measure the resistance of the EFI NO. 1 fuse.
      Fig 7: Locating EFI No. 1 Fuse
      G02908060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: Below 1 Ω 

    1. NG: REPLACE FUSE 
    2. OK: GO TO NEXT STEP. 
  8. INSPECT RELAY (EFI) 
    1. Remove the EFI relay from the engine room J/B.
    2. Measure the resistance of the EFI relay.
      Fig 8: Identifying EFI Relay Terminals
      G02908061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)
    1. NG: REPLACE RELAY 
    2. OK: GO TO NEXT STEP. 
  9. CHECK WIRE HARNESS (EFI RELAY - ECM, EFI RELAY - BODY GROUND) 
    1. Check the wire harness between the EFI relay and ECM.
      1. Remove the EFI relay from the engine room J/B.
      2. Disconnect the E5 ECM connector.
      3. Measure the resistance of the wire harness side connectors.

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      J/B EFI relay terminal 1 - E5-8 (MREL) Below 1 Ω
      J/B FFI relay terminal 1 or E5-8 (MREL) - Body around 10 kΩ or higher
    2. Check the wire harness between the EFI relay and body ground.
      1. Remove the EFI relay from the engine room J/B.
      2. Measure the resistance of the wire harness side connector and the body ground.
        3. Fig 9: Locating EFI Relay & Identifying ECM Resistance Test Terminals
        G02908062Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      J/B EFI relay terminal 2 - Body ground Below 1 Ω
    1. OK: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. NG: CHECK AND REPAIR HARNESS AND CONNECTOR (TERMINAL +B OF ECM - BATTERY POSITIVE TERMINAL) 
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