Inspection Procedure

WARNING: This page is about a different variant/trim than selected.

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 INSPECTION )
OK: Spark occurs.
1. NG: Go to step 6
2. OK: GO TO NEXT STEP.
CHECK WIRE HARNESS (IGNITION COIL ASSY - ECM (IGF TERMINAL))
1. Disconnect the I2, I3, I4 and I5 ignition coil connectors.
2. Disconnect the E7 ECM connector.
  
  Fig 1: Identifying Ignition Coil & ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 2: Ignition Coil Harness Resistance Test Specifications
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OF REPLACE HARNESS AND CONNECTOR
2. OK: GO TO NEXT STEP.

CHECK ECM (IGF1 VOLTAGE)

Disconnect the I2, I3, I4 and I5 ignition coil connectors.
Turn the ignition switch ON.

Measure the voltage of the ECM connectors.

Fig 3: Identifying E7 ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

TESTER CONNECTION AND CONDITION SPECIFICATIONS

Tester Connection	Specified Condition
E7-24 (IGF1) - E9-1 (E1)	4.5 to 5.5 V

HINT:

Reference: Inspection using the oscilloscope. During cranking or idling, check the waveform of the ECM connectors.

Fig 4: Identifying IGT And IGF Signal Waveform ECM Test Terminals

Standard:

TESTER CONNECTION AND CONDITION SPECIFICATIONS

Tester Connection	Specified Condition
E7-24 (IGF1) - E9-1 (E1)	Correct waveform is as shown

NG: REPLACE ECM (See REPLACEMENT )
OK: REPLACE IGNITION COIL ASSY

CHECK WIRE HARNESS (IGNITION COIL ASSY - ECM (IGT TERMINAL))
1. Disconnect the I2, I3, I4 and I5 ignition coil connectors.
2. Disconnect the E7 ECM connector.
3. Measure the resistance of the wire harness side connectors.
  
  Fig 5: Identifying Igniton Coil & ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 6: Ignition Coil Harness Resistance Test Specifications
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
2. OK: GO TO NEXT STEP.
CHECK ECM
1. Measure the voltage of the ECM connectors when the engine is cranked.
  
  Fig 7: Identifying E7 And E9 ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 8: Measuring Voltage At ECM Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the I2, I3, I4 and I5 ignition coil connectors.
3. Measure the voltage of the ECM connectors when the engine is cranked.
  
  Fig 9: Identifying E7 And E9 ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 10: Measuring Voltage At ECM Terminals (Ignition Coil Connectors Disconected)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  Reference: Inspection using an oscilloscope. During cranking or idling, check the waveform of the ECM connectors.
  
  Fig 11: Identifying IGT And IGF Signal Waveform ECM Test Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 12: Wavefor Desired Result
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE ECM (See REPLACEMENT )
2. OK: GO TO NEXT STEP.
CHECK IGNITION COIL ASSY (POWER SOURCE)
1. Disconnect the I2, I3, I4 and I5 ignition coil connectors.
2. Turn the ignition switch ON.
3. Measure the voltage of the wire harness side connector and body ground.
  
  Fig 13: Identifying Ignition Coil Connector Terminals (Wire Harness Side)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 14: Testing For Voltage At Coil Connectors (Ignition ON)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: REPLACE IGNITION COIL ASSY
2. NG: GO TO NEXT STEP.
CHECK WIRE HARNESS (IGNITION COIL ASSY - IGNITION SWITCH)
1. Check the IG2 fuse.
  1. Remove the IG2 fuse from the instrument panel J/B Assy.
  2. Measure the resistance of the IG2 fuse.
    
    Fig 15: Locating IG2 Fuse
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard: Below 1 Ω
2. Disconnect the I2, I3, I4 and I5 ignition coil connectors.
3. Disconnect the I15 ignition switch connector.
4. Measure the resistance of the wire harness side connectors.
  
  Fig 16: Identifying Ignition Coil And Ignition Switch Connector Terminals (Wire Harness Side)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 17: Harness Resistance Values
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
2. OK: REPLACE IGNITION COIL ASSY