Inspection Procedure

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

HINT: Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354)

Connect a hand-held tester or OBD II scan tool to the DLC3.
Turn the ignition switch to ON.
Turn the tester or scan tool ON.
Clear DTCs (see DTC CHECK/CLEAR ).
Shuffle arrangement of the ignition coils with igniters (among No. 1 to No. 4 cylinders).
NOTE: Do not shuffle the connectors.
Perform a simulation test.

Check DTCs displayed on the tester or scan tool.

Result:

DTC OUTPUT RESULT

Display (DTC output)	Proceed To
Same DTCs (that have been erased)	A
Other DTCs	B

B: REPLACE IGNITION COIL ASSY (See VALVE CLEARANCE (2ZZ-GE) )
A: GO TO NEXT STEP

INSPECT ECM (IGT1, IGT2, IGT3, IGT4 AND IGF SIGNAL)

Inspect using an oscilloscope.

While cranking or idling, check the waveform between the terminals of the E3 ECM connector.

Standard:

ECM TESTER CONNECTION SPECIFIED CONDITIONS

Tester Connections	Specified Conditions
IGT1 (E3-8) - E1 (E3-5)	Correct waveform shown
IGT2 (E3-9) - E1 (E3-5)	Correct waveform shown
IGT3 (E3-10) - E1 (E3-5)	Correct waveform shown
IGT4 (E3-11) - E1 (E3-5)	Correct waveform shown
IGF (E3-24) - E1 (E3-5)	Correct waveform shown

Fig 1: Inspecting ECM (IGT1, IGT2, IGT3, IGT4 And IGF Signal)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: E3 ECM Connector Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ECM (See ECM (1ZZ-FE/2ZZ-GE) REPLACEMENT )
OK: GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - ECM)

Disconnect the I2, I3, I4 or I5 ignition coil with igniter connector.
Disconnect the E3 ECM connector.

Check the resistance.

Standard (Check for open):

IGNITION COIL ASSY - ECM RESISTANCE (CHECK FOR OPEN)

Tester Connections	Specified Conditions
IGF (I2-2) - IGF (E3-24)	Below 1 Ω
IGF (I3-2) - IGF (E3-24)	Below 1 Ω
IGF (I4-2) - IGF (E3-24)	Below 1 Ω
IGF (I5-2) - IGF (E3-24)	Below 1 Ω

Fig 3: Disconnecting E3 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard (Check for open):

IGNITION COIL ASSY - ECM RESISTANCE (CHECK FOR SHORT)

Tester Connections	Specified Conditions
IGT (I2-3) - IGT1 (E3-8)	Below 1 Ω
IGT (I3-3) - IGT2 (E3-9)	Below 1 Ω
IGT (I4-3) - IGT3 (E3-10)	Below 1 Ω
IGT (I5-3) - IGT4 (E3-11)	Below 1 Ω

Fig 4: Identifying Terminals Of Ignition Coil And Igniter Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard (Check for short):

IGNITION COIL ASSY - ECM RESISTANCE (CHECK FOR SHORT)

Tester Connections	Specified Conditions
IGF (I2-2) or IGF (E3-24) - Body ground	10 kΩ or higher
IGF (I3-2) or IGF (E3-24) - Body ground	10 kΩ or higher
IGF (I4-2) or IGF (E3-24) - Body ground	10 kΩ or higher
IGF (I5-2) or IGF (E3-24) - Body ground	10 kΩ or higher

Standard (Check for short):

IGNITION COIL ASSY - ECM RESISTANCE (CHECK FOR SHORT)

Tester Connections	Specified Conditions
IGT (I2-3) or IGT1 (E3-8) - Body ground	10 kΩ or higher
IGT (I3-3) or IGT2 (E3-9) - Body ground	10 kΩ or higher
IGT (I4-3) or IGT3 (E3-10) - Body ground	10 kΩ or higher
IGT (I5-3) or IGT4 (E3-11) - Body ground	10 kΩ or higher

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: GO TO NEXT STEP

INSPECT IGNITION COIL ASSY (POWER SOURCE)

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

Check the resistance.

Standard (Check for open):

IGNITION COIL ASSY (POWER SOURCE) RESISTANCE (CHECK FOR OPEN)

Tester Connections	Specified Conditions
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

Fig 5: Identifying Terminals Of Ignition Coil With Igniter Connector

Turn the ignition switch to ON.

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

Standard:

IGNITION COIL ASSY (POWER SOURCE) VOLTAGE

Tester Connections	Specified Conditions
+B (I2-1) - GND (I2-4)	Between 9 V and 14 V
+B (I3-1) - GND (I3-4)	Between 9 V and 14 V
+B (I4-1) - GND (I4-4)	Between 9 V and 14 V
+B (I5-1) - GND (I5-4)	Between 9 V and 14 V

Reconnect the ignition coil with igniter connector.

OK: REPLACE IGNITION COIL ASSY (See VALVE CLEARANCE (2ZZ-GE) )
NG: GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - ECM)

Disconnect the I2, I3, I4 or I5 ignition coil with igniter connector.
Disconnect the E5 ECM connector.

Check the resistance.

Standard (Check for open):

IGNITION COIL ASSY - ECM RESISTANCE (CHECK FOR OPEN)

Tester Connections	Specified Conditions
+B (I2-1) - MREL (E5-4)	Below 1 Ω
+B (I3-1) - MREL (E5-4)	Below 1 Ω
+B (I4-1) - MREL (E5-4)	Below 1 Ω
+B (I5-1) - MREL (E5-4)	Below 1 Ω

Fig 6: Identifying Terminals Of Ignition Coil With Igniter Connector

Standard (Check for short):

IGNITION COIL ASSY - ECM RESISTANCE (CHECK FOR SHORT)

Tester Connections	Specified Conditions
+B (I2-1) or MREL (E5-4) - Body ground	10 kΩ or higher
+B (I3-1) or MREL (E5-4) - Body ground	10 kΩ or higher
+B (I4-1) or MREL (E5-4) - Body ground	10 kΩ or higher
+B (I5-1) or MREL (E5-4) - Body ground	10 kΩ or higher

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

Fig 7: Disconnecting E5 ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: GO TO NEXT STEP
REPLACE IGNITION COIL ASSY (See VALVE CLEARANCE (2ZZ-GE) )