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))

Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
Disconnect the E10 ECM connector.

Check the resistance between the wire harness side connectors.

Standard (Check for open):

Fig 1: Identifying Ignition Coil Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
Ignition coil (I1-2) - IGF1 (E10-24)	Below 1 Ω
Ignition coil (I2-2) - IGF1 (E10-24)
Ignition coil (I3-2) - IGF1 (E10-24)
Ignition coil (I4-2) - IGF1 (E10-24)
Ignition coil (I5-2) - IGF1 (E10-24)
Ignition coil (I6-2) - IGF1 (E10-24)

Standard (Check for short):

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
Ignition coil (I1-2) or IGF1 (E10-24) - Body ground	10 kΩ or higher
Ignition coil (I2-2) or IGF1 (E10-24) - Body ground
Ignition coil (I3-2) or IGF1 (E10-24) - Body ground
Ignition coil (I4-2) or IGF1 (E10-24) - Body ground
Ignition coil (I5-2) or IGF1 (E10-24) - Body ground
Ignition coil (I6-2) or IGF1 (E10-24) - Body ground

Fig 2: Identifying E10 ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reconnect the ignition coil connector.
Reconnect the ECM connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

INSPECT ECM (IGF1 VOLTAGE)

Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
Turn the ignition switch ON.

Measure the voltage between the specified terminals of the E8 and E10 ECM connectors.

Standard:

Fig 3: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IGF1 (E10-24) - E1 (E8-1)	4.5 to 5.5 V

Reconnect the ignition coil connector.

NG: REPLACE ECM (See REPLACEMENT )

OK: REPLACE IGNITION COIL ASSY

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - ECM (IGT SIGNAL TERMINAL))

Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
Disconnect the E10 ECM connector.

Check the resistance between the wire harness side connectors.

Fig 4: Identifying Ignition Coil Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard (Check for open):

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
Ignition coil (I1-3) - IGT1 (E10-8)	Below 1 Ω
Ignition coil (I2-3) - IGT2 (E10-9)
Ignition coil (I3-3) - IGT3 (E10-10)
Ignition coil (I4-3) - IGT4 (E10-11)
Ignition coil (I5-3) - IGT5 (E10-12)
Ignition coil (I6-3) - IGT6 (E10-13)

Fig 5: Identifying E10 ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard (Check for short):

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
Ignition coil (I1-3) or IGT1 (E10-8) - Body ground	10 kΩ or higher
Ignition coil (I2-3) or IGT2 (E10-9) - Body ground
Ignition coil (I3-3) or IGT3 (E10-10) - Body ground
Ignition coil (I4-3) or IGT4 (E10-11) - Body ground
Ignition coil (I5-3) or IGT5 (E10-12) - Body ground
Ignition coil (I6-3) or IGT6 (E10-13) - Body ground

Reconnect the ignition coil connector.
Reconnect the ECM connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5 OR IGT6 VOLTAGE)

Measure the voltage between the applicable terminals of the E8 and E10 ECM connectors when the engine is cranked.

Standard:

Fig 6: Identifying E10 ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IGT1 (E10-8) - E1 (E8-1)	Between 0.1 V and 4.5 V
IGT2 (E10-9) - E1 (E8-1)
IGT3 (E10-10) - E1 (E8-1)
IGT4 (E10-11) - E1 (E8-1)
IGT5 (E10-12) - E1 (E8-1)
IGT6 (E10-13) - E1 (E8-1)

NG: REPLACE ECM (See REPLACEMENT )

OK: GO TO NEXT STEP

INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5 OR IGT6 VOLTAGE)

Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.

Measure the voltage between the applicable terminals of the E8 and E10 ECM connectors when the engine is cranked.

Standard:

Fig 7: Identifying Ignition Coil Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IGT1 (E10-8) - E1 (E8-1)	4.5 V or more
IGT2 (E10-9) - E1 (E8-1)
IGT3 (E10-10) - E1 (E8-1)
IGT4 (E10-11) - E1 (E8-1)
IGT5 (E10-12) - E1 (E8-1)
IGT6 (E10-13) - E1 (E8-1)

Reconnect the ignition coil connector.

Fig 8: Identifying E10 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ECM (See REPLACEMENT )

OK: GO TO NEXT STEP

INSPECT IGNITION COIL ASSY (POWER SOURCE)

Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
Turn the ignition switch ON.

Measure the voltage between the terminal of the wire harness side connector and the body ground.

Standard:

Fig 9: Identifying Ignition Coil Connector Terminals

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
I1-1 - Body ground	9 to 14 V
I2-1 - Body ground
I3-1 - Body ground
I4-1 - Body ground
I5-1 - Body ground
I6-1 - Body ground

Reconnect the ignition coil connector.

OK: REPLACE IGNITION COIL ASSY

OK: GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - IGNITION SWITCH)

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.
Disconnect the I1, I2, I3, I4, I5 or I6 ignition coil connector.
Disconnect the I14 ignition switch connector.

Check the resistance between the wire harness side connectors.

Fig 10: Identifying IGN Fuse

Standard (Check for open):

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
Ignition coil (I1-1) - IG2 (I14-6)	Below 1 Ω
Ignition coil (I2-1) - IG2 (I14-6)
Ignition coil (I3-1) - IG2 (I14-6)
Ignition coil (I4-1) - IG2 (I14-6)
Ignition coil (I5-1) - IG2 (I14-6)
Ignition coil (I6-1) - IG2 (I14-6)

Fig 11: Identifying Ignition Coil Connector Terminals

Standard (Check for short):

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
Ignition coil (I1-1) or IG2 (I14-6) - Body ground	10 kΩ or higher
Ignition coil (I2-1) or IG2 (I14-6) - Body ground
Ignition coil (I3-1) or IG2 (I14-6) - Body ground
Ignition coil (I4-1) or IG2 (I14-6) - Body ground
Ignition coil (I5-1) or IG2 (I14-6) - Body ground
Ignition coil (I6-1) or IG2 (I14-6) - Body ground

Reconnect the ignition coil connector.
Reconnect the ignition switch connector.

Fig 12: Identifying Ignition Switch Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE IGNITION COIL ASSY