Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

CHECK FOR SPARKS AND CHECK SPARK PLUG OF MISFIRING CYLINDER
HINT:

(See step 6 under 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 ASSEMBLY - ECM (IGF1 SIGNAL TERMINAL))

Disconnect the I2, I3, I4, I5, I6 or I7 ignition coil with igniter connector.
Disconnect the E8 ECM connector.

Measure the resistance.

Standard resistance:

Check for open

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IGF (I2-2) - IGF1 (E8-24)	Below 1 Ω
IGF (I3-2) - IGF1 (E8-24)	Below 1 Ω
IGF (I4-2) - IGF1 (E8-24)	Below 1 Ω
IGF (I5-2) - IGF1 (E8-24)	Below 1 Ω
IGF (I6-2) - IGF1 (E8-24)	Below 1 Ω
IGF (I7-2) - IGF1 (E8-24)	Below 1 Ω

Check for short

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IGF (I2-2) or IGF1 (E8-24) - Body ground	10 kΩ or higher
IGF (I3-2) or IGF1 (E8-24) - Body ground	10 kΩ or higher
IGF (I4-2) or IGF1 (E8-24) - Body ground	10 kΩ or higher
IGF (I5-2) or IGF1 (E8-24) - Body ground	10 kΩ or higher
IGF (I6-2) or IGF1 (E8-24) - Body ground	10 kΩ or higher
IGF (I7-2) or IGF1 (E8-24) - Body ground	10 kΩ or higher

Reconnect the ECM connector.
Reconnect the ignition coil with igniter connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 1: Identifying Ignition Coil With Igniter And ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

INSPECT ECM (IGF1 VOLTAGE)

Disconnect the ignition coil connector.
Turn the ignition switch to the ON position.

Measure the voltage between the terminals of the E8 and E7 ECM connectors.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IGF1 (E8-24) - E1 (E7-1)	4.5 to 5.5 V

Reconnect the ignition coil connector.

NG: REPLACE ECM (See REMOVAL )

Fig 2: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE IGNITION COIL ASSEMBLY (See REMOVAL )

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

Disconnect the I2, I3, I4, I5, I6 or I7 ignition coil with igniter connector.
Disconnect the E8 ECM connector.

Measure the resistance.

Standard resistance:

Check for open

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IGT (I2-3) - IGT1 (E8-8)	Below 1 Ω
IGT (I3-3) - IGT2 (E8-9)	Below 1 Ω
IGT (I4-3) - IGT3 (E8-10)	Below 1 Ω
IGT (I5-3) - IGT4 (E8-11)	Below 1 Ω
IGT (I6-3) - IGT5 (E8-12)	Below 1 Ω
IGT (I7-3) - IGT6 (E8-13)	Below 1 Ω

Check for short

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IGT (I2-3) or IGT1 (E8-8) - Body ground	10 kΩ or higher
IGT (I3-3) or IGT2 (E8-9) - Body ground	10 kΩ or higher
IGT (I4-3) or IGT3 (E8-10) - Body ground	10 kΩ or higher
IGT (I5-3) or IGT4 (E8-11) - Body ground	10 kΩ or higher
IGT (I6-3) or IGT5 (E8-12) - Body ground	10 kΩ or higher
IGT (I7-3) or IGT6 (E8-13) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Identifying Ignition Coil With Igniter And ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

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

Turn the ignition switch to the ON position.

Measure the voltage between the terminals of the E8 and E7 ECM connectors.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IGT1 (E8-8) - E1 (E7-1)	0.1 to 4.5 V
IGT2 (E8-9) - E1 (E7-1)	0.1 to 4.5 V
IGT3 (E8-10) - E1 (E7-1)	0.1 to 4.5 V
IGT4 (E8-11) - E1 (E7-1)	0.1 to 4.5 V
IGT5 (E8-12) - E1 (E7-1)	0.1 to 4.5 V
IGT6 (E8-13) - E1 (E7-1)	0.1 to 4.5 V

NG: REPLACE ECM (See REMOVAL )

Fig 4: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

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

Disconnect the I2, I3, I4, I5, I6 or I7 ignition coil connector.
Turn the ignition switch to the ON position.

Measure the voltage between the terminals of the E8 and E7 ECM connectors.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IGT1 (E8-8) - E1 (E7-1)	4.5 V or more
IGT2 (E8-9) - E1 (E7-1)	4.5 V or more
IGT3 (E8-10) - E1 (E7-1)	4.5 V or more
IGT4 (E8-11) - E1 (E7-1)	4.5 V or more
IGT5 (E8-12) - E1 (E7-1)	4.5 V or more
IGT6 (E8-13) - E1 (E7-1)	4.5 V or more

Reconnect the ignition coil connector.

NG: REPLACE ECM (See REMOVAL )

Fig 5: Identifying Ignition Coil With Igniter And ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

Disconnect the I2, I3, I4, I5, I6 or I7 ignition coil with igniter connector.

Measure the resistance.

Standard resistance:

Check for open

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
GND (I2-4) - Body ground	Below 1 Ω
GND (I3-4) - Body ground	Below 1 Ω
GND (I4-4) - Body ground	Below 1 Ω
GND (I5-4) - Body ground	Below 1 Ω
GND (I6-4) - Body ground	Below 1 Ω
GND (I7-4) - Body ground	Below 1 Ω

Turn the ignition switch to the ON position.

Measure the voltage between the terminals of the wire harness side connector.

Fig 6: Identifying Ignition Coil With Igniter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
+B (I2-1) - GND (I2-4)	9 to 14 V
+B (I3-1) - GND (I3-4)	9 to 14 V
+B (I4-1) - GND (I4-4)	9 to 14 V
+B (I5-1) - GND (I5-4)	9 to 14 V
+B (I6-1) - GND (I6-4)	9 to 14 V
+B (I7-1) - GND (I7-4)	9 to 14 V

Reconnect the ignition coil with igniter connector.

NG: Go to step 8

OK: REPLACE IGNITION COIL ASSEMBLY (See REMOVAL )

INSPECT IG2 RELAY

Remove the IG2 relay from the engine room R/B.

Measure the IG2 relay resistance.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Bellow 1 Ω (when battery voltage applied to terminals 1 and 2)

Reinstall the IG2 relay.

NG: REPLACE IG2 RELAY

Fig 7: Identifying IG2 Relay Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

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

Disconnect the I2, I3, I4, I5, I6 or I7 ignition coil with igniter connector.
Remove the IG2 relay from the engine room R/B.

Measure the resistance.

Standard resistance:

Check for open

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
+B (I2-1) - IG2 relay terminal (3)	Below 1 Ω
+B (I3-1) - IG2 relay terminal (3)	Below 1 Ω
+B (I4-1) - IG2 relay terminal (3)	Below 1 Ω
+B (I5-1) - IG2 relay terminal (3)	Below 1 Ω
+B (I6-1) - IG2 relay terminal (3)	Below 1 Ω
+B (I7-1) - IG2 relay terminal (3)	Below 1 Ω

Fig 8: Identifying Ignition Coil With Igniter And IG2 Relay Connector Terminals

Check for short

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
+B (I2-1) or IG2 relay terminal (3) - Body ground	10 kΩ or higher
+B (I3-1) or IG2 relay terminal (3) - Body ground	10 kΩ or higher
+B (I4-1) or IG2 relay terminal (3) - Body ground	10 kΩ or higher
+B (I5-1) or IG2 relay terminal (3) - Body ground	10 kΩ or higher
+B (I6-1) or IG2 relay terminal (3) - Body ground	10 kΩ or higher
+B (I7-1) or IG2 relay terminal (3) - Body ground	10 kΩ or higher

Reconnect the ignition coil with igniter connector.
Reinstall the IG2 relay connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (IG2 RELAY - BATTERY)

Inspect the INJ fuse.
1. Remove the INJ fuse from the fusible link.
2. Measure the INJ fuse resistance.
  Standard resistance:
  
  Below 1 Ω
3. Reinstall the INJ fuse.

Check the harness and connector between the IG2 relay and positive battery terminal.

Remove the IG2 relay from the engine room R/B.
Disconnect the battery negative terminal.
Disconnect the battery positive terminal.

Measure the resistance between the terminals.

Standard resistance (check for open)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IG2 relay terminal (5) - Battery positive terminal	Below 1 Ω

Standard resistance (check for short)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IG2 relay terminal (5) or Battery positive terminal - Body ground	10 kΩ or higher

Reconnect the battery positive terminal.
Reconnect the battery negative terminal.
Reinstall the IG2 relay.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 9: Identifying IG2 Relay Terminals

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - BODY GROUND)

Inspect the IG2 fuse.
1. Remove the IG2 fuse from the instrument panel J/B.
2. Measure the IG2 fuse resistance.
  Standard resistance:
  
  Below 1 Ω
3. Reinstall the IG2 fuse.

Check the harness and connector between the IG2 relay and ignition switch.

Remove the IG2 relay from the engine room R/B.
Disconnect the I14 ignition switch connector.

Measure the resistance between the terminals.

Standard resistance (check for open)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IG2 (I14-6) - IG2 relay terminal (1)	Below 1 Ω

Standard resistance (check for short)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
IG2 (I14-6) or IG2 relay terminal (1) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 10: Identifying IG2 Relay And Ignition Switch Connector Terminals

OK: REPLACE IGNITION COIL ASSEMBLY (See REMOVAL )