Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are 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
NG: Go to step 4

OK: Go to next step
CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM [IGF SIGNAL TERMINAL])
1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT ECM (IGF1 AND IGF2 VOLTAGE)

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

Measure the voltage of the E6 and E8 ECM connector.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Specified Condition
E8-24 (IGF1) - E6-1 (E1)	4.5 to 5.5 V
E8-25 (IGF2) - E6-1 (E1)	4.5 to 5.5 V

Reconnect the ignition coil connector.

NG: REPLACE ECM

Fig 1: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE IGNITION COIL

CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM [IGT SIGNAL TERMINAL])
1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7 OR IGT8 VOLTAGE)

Measure the voltage of the E6 and E8 ECM connectors when the engine is cranked.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Specified Condition
E8-8 (IGT1) - E6-1 (E1)	0.1 to 4.5 V
E8-15 (IGT2) - E6-1 (E1)	0.1 to 4.5 V
E8-11 (IGT3) - E6-1 (E1)	0.1 to 4.5 V
E8-10 (IGT4) - E6-1 (E1)	0.1 to 4.5 V
E8-13 (IGT5) - E6-1 (E1)	0.1 to 4.5 V
E8-12 (IGT6) - E6-1 (E1)	0.1 to 4.5 V
E8-14 (IGT7) - E6-1 (E1)	0.1 to 4.5 V
E8-9 (IGT8) - E6-1 (E1)	0.1 to 4.5 V

NG: REPLACE ECM

Fig 2: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7 OR IGT8 VOLTAGE)

Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil connector.

Measure the voltage of the E6 and E8 ECM connectors when the engine is cranked.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Specified Condition
E8-8 (IGT1) - E6-1 (E1)	4.5 V or more
E8-15 (IGT2) - E6-1 (E1)	4.5 V or more
E8-11 (IGT3) - E6-1 (E1)	4.5 V or more
E8-10 (IGT4) - E6-1 (E1)	4.5 V or more
E8-13 (IGT5) - E6-1 (E1)	4.5 V or more
E8-12 (IGT6) - E6-1 (E1)	4.5 V or more
E8-14 (IGT7) - E6-1 (E1)	4.5 V or more
E8-9 (IGT8) - E6-1 (E1)	4.5 V or more

Reconnect the ignition coil connector.

NG: REPLACE ECM

Fig 3: Identifying ECM Connector Terminals

OK: Go to next step

INSPECT IGNITION COIL (POWER SOURCE)

Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connector.
Turn the ignition switch ON or START.

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

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Specified Condition
I1-1 (+B) - Body ground	9 to 14 V
I2-1 (+B) - Body ground	9 to 14 V
I3-1 (+B) - Body ground	9 to 14 V
I4-1 (+B) - Body ground	9 to 14 V
I5-1 (+B) - Body ground	9 to 14 V
I6-1 (+B) - Body ground	9 to 14 V
I7-1 (+B) - Body ground	9 to 14 V
I8-1 (+B) - Body ground	9 to 14 V

Reconnect the ignition coil connector.

OK: REPLACE IGNITION COIL

Fig 4: Identifying Ignition Coil Connector Terminals

NG: Go to next step

CHECK HARNESS AND CONNECTOR (IGNITION COIL - IGNITION SWITCH)
1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE IGNITION COIL