Inspection Procedure

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

CHECK FUSE (ETCS FUSE)
1. Remove the ETCS fuse from the engine room J/B.
2. Check for continuity in the ETCS fuse.
  Standard: Continuity
3. Reinstall the ETCS fuse.
  
  Fig 1: Identifying ECTS Fuse
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE

OK: GO TO NEXT STEP.
INSPECT ECM (+BM VOLTAGE)
1. Measure the voltage between the specified terminals the E7 and E8 ECM connectors.
  Standard:
  
  Fig 2: ECM Connector Terminals Specified Condition Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 3: Identifying ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE ECM (See ECM (3MZ-FE) )

NG: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE -BATTERY)
1. Check the harness and the connector between the ETCS fuse and the ECM.
  1. Remove the ETCS fuse from the engine room J/B.
  2. Disconnect the E7 ECM connector.
  3. Check the resistance between the wire harness side connectors.
    Standard (Check for open):
    
    Fig 4: ECM Terminals And ETCS Fuse Specified Condition Chart (Check For Open)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard (Check for short):
    
    Fig 5: ECM Terminals And ETCS Fuse Specified Condition Chart (Check For Short)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Reinstall the ETCS fuse.
  5. Reconnect the E7 ECM connector.
2. Check the harness and the connector between the ETCS fuse and the battery.
  1. Remove the ETCS fuse from the engine room J/B.
  2. Disconnect the positive battery cable.
  3. Check the resistance between the wire harness side connectors.
    Standard (Check for open):
    
    Fig 6: Battery Positive Terminals And ETCS Fuse Specified Condition Chart (Check For Open)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard (Check for short):
    
    Fig 7: Battery Positive Terminals And Body Ground Terminals Specified Condition Chart (Check For Short)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Reinstall the ETCS fuse.
  5. Reconnect the positive battery cable.
    
    Fig 8: Identifying ETCS Fuse
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 9: Disconnecting E7 ECM Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP.

CHECK ENGINE ROOM JUNCTION BLOCK ASSY