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 SPARK PLUG AND SPARK OF MISFIRING CYLINDER (See DTC P0300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED, DTC P0301 CYLINDER 1 MISFIRE DETECTED, DTC P0302 CYLINDER 2 MISFIRE DETECTED, DTC P0303 CYLINDER 3 MISFIRE DETECTED, DTC P0304 CYLINDER 4 MISFIRE DETECTED, DTC P0305 CYLINDER 5 MISFIRE DETECTED, DTC P0306 CYLINDER 6 MISFIRE DETECTED )
NG: Go to step 4

OK: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - ECM (IGF1 SIGNAL TERMINAL))
1. Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
2. Disconnect the E10 ECM connector.
3. Check the resistance between the wire harness side connectors.
  Standard (Check for open):
  
  Fig 1: Ignition Coil Connector Terminals Specified Condition Chart (Check For Open)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard (Check for short):
  
  Fig 2: Ignition Coil Connector Terminals Specified Condition Chart (Check For Short)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Reconnect the ignition coil connector.
5. Reconnect the ECM connector.
  
  Fig 3: Identifying Ignition Coil Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Disconnecting E10 ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP.
INSPECT ECM (IGF1 VOLTAGE)
1. Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
2. Turn the ignition switch ON.
3. Measure the voltage between the specified terminals of the E8 and E10 ECM connectors.
  Standard:
  
  Fig 5: ECM Connector Terminals Specified Condition Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 6: Identifying ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Reconnect the ignition coil connector.
NG: REPLACE ECM (See ECM (3MZ-FE) )

OK: GO TO NEXT STEP.

REPLACE IGNITION COIL ASSY
CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - ECM (IGT SIGNAL TERMINAL))
1. Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
2. Disconnect the E10 ECM connector.
3. Check the resistance between the wire harness side connectors.
  Standard (Check for open):
  
  Fig 7: Ignition Coil Assy And ECM Terminals Specified Condition Chart (Check For Open)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard (Check for short):
  
  Fig 8: Ignition Coil Assy And ECM Terminals Specified Condition Chart (Check For Short)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Reconnect the ignition coil connector.
5. Reconnect the ECM connector.
  
  Fig 9: Identifying Ignition Coil Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 10: Connecting E10 ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP.
INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5 OR IGT6 VOLTAGE)
1. Measure the voltage between the applicable terminal the E8 and E10 ECM connectors when the engine is cranked.
  Standard:
  
  Fig 11: ECM Connector Terminals Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 12: Identifying ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE ECM (See ECM (3MZ-FE) )

OK: GO TO NEXT STEP.
INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5 OR IGT6 VOLTAGE)
1. Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
2. Measure the voltage between the applicable terminals of the E8 and E10 ECM connectors when the engine is cranked.
  Standard:
  
  Fig 13: ECM Connector Terminals Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Reconnect the ignition coil connector.
  
  Fig 14: Identifying Ignition Coil Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 15: Identifying ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE ECM (See ECM (3MZ-FE) )

OK: GO TO NEXT STEP.
INSPECT IGNITION COIL ASSY (POWER SOURCE)
1. Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
2. Turn the ignition switch ON.
3. Measure the voltage between the terminal of the wire harness side connector and the body ground.
  Standard:
  
  Fig 16: Ignition Coil Connector Terminals Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Reconnect the ignition coil connector.
  
  Fig 17: Identifying Ignition Coil Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE IGNITION COIL ASSY

NG: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - IGNITION SWITCH)
1. Inspect the IGN fuse.
  1. Remove the IGN fuse from the engine room J/B.
  2. Check for continuity in the IGN fuse.
    Standard: Continuity
  3. Reinstall the IGN fuse.
2. Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
3. Disconnect the I14 ignition switch connector.
4. Check the resistance between the wire harness side connectors.
  Standard (Check for open):
  
  Fig 18: Ignition Coil Assy And Ignition Switch Terminals Specified Condition Chart (Check For Open)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard (Check for short):
  
  Fig 19: Ignition Coil Assy And Ignition Switch Terminals Specified Condition Chart (Check For Short)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Reconnect the ignition coil connector.
6. Reconnect the ignition switch connector.
  
  Fig 20: Identifying IGN Fuse
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 21: Identifying Ignition Coil Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 22: Identifying Ignition Switch Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP.

REPLACE IGNITION COIL ASSY