Inspection Procedure

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 PTC OUTPUT RECURS (PTC 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
P0351, P0352, P0353 or P0354	A
Any other DTCs	B

B : REPLACE IGNITION COIL ASSY (See ADJUSTMENT )
A : GO TO NEXT STEP

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

Inspect the ECM using an oscilloscope.

While cranking or idling, check the waveform between the terminals of the E3 and E4 ECM connector.

Standard:

E3 AND E4 ECM CONNECTOR WAVEFORM REFERENCE

Tester Connections	Specified Conditions
IGT1 (E3-8) - E1 (E4-7)	Correct waveform shown
IGT2 (E3-9) - E1 (E4-7)	Correct waveform shown
IGT3 (E3-10) - E1 (E4-7)	Correct waveform shown
IGT4 (E3-11) - E1 (E4-7)	Correct waveform shown
IGF1 (E3-23) - E1 (E4-7)	Correct waveform shown

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Checking Waveform Between Terminals Of E3 & E4 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE ECM (See 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):

RESISTANCE SPECIFICATIONS FOR OPEN

Tester Connections	Specified Conditions
IGF1 (I2-2) - IGF1 (E3-23)	Below 1 Ω
IGF1 (I3-2) - IGF1 (E3-23)	Below 1 Ω
IGF1 (I4-2) - IGF1 (E3-23)	Below 1 Ω
IGF1 (I5-2) - IGF1 (E3-23)	Below 1 Ω

Standard (Check for open):

Fig 3: Checking ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

RESISTANCE SPECIFICATIONS FOR OPEN

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

Standard (Check for short):

RESISTANCE SPECIFICATIONS FOR SHORT

Tester Connections	Specified Conditions
IGF1 (I2-2) or IGF1 (E3-23) - Body ground	10 kΩ or higher
IGF1 (I3-2) or IGF1 (E3-23) - Body ground	10 kΩ or higher
IGF1 (I4-2) or IGF1 (E3-23) - Body ground	10 kΩ or higher
IGF1 (I5-2) or IGF1 (E3-23) - Body ground	10 kΩ or higher

Fig 4: Disconnecting I2, I3, I4 Or I5 Ignition Coil With Igniter Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard (Check for short):

RESISTANCE SPECIFICATIONS 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 12, 13, 14 or 15 ignition coil with igniter connector.

Check the resistance.

Standard (Check for open):

RESISTANCE SPECIFICATIONS FOR OPEN

Tester Connections	Specified Conditions
GND (I1-4) - Body ground	Below 1 Ω
GND (I2-4) - Body ground
GND (I3-4) - Body ground
GND (I4-4) - Body ground

Fig 5: Inspecting Ignition Coil Assy (Power Source)

Turn the ignition switch to ON.

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

Standard:

WIRE HARNESS SIDE CONNECTOR TERMINALS VOLTAGE SPECIFICATIONS

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.

NG : Go to step 5
OK : REPLACE IGNITION COIL ASSY (See ADJUSTMENT )

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

Disconnect the 12, 13, 14 or 15 ignition coil with igniter connector.
Disconnect the I10 ignition switch connector.

Check the resistance.

Fig 6: Disconnecting 12, 13, 14 Or 15 Ignition Coil With Igniter Connector

Standard (Check for open):

RESISTANCE SPECIFICATIONS FOR OPEN

Tester Connections	Specified Conditions
+B (I2-1) - IG2 (I10-6)	Below 1 Ω
+B (I3-1) - IG2 (I10-6)	Below 1 Ω
+B (I4-1) - IG2 (I10-6)	Below 1 Ω
+B (I5-1) - IG2 (I10-6)	Below 1 Ω

Standard (Check for short):

RESISTANCE SPECIFICATIONS FOR SHORT

Tester Connections	Specified Conditions
+B (I2-1) or IG2 (I10-6) - Body ground	10 kΩ or higher
+B (I3-1) or IG2 (I10-6) - Body ground	10 kΩ or higher
+B (I4-1) or IG2 (I10-6) - Body ground	10 kΩ or higher
+B (I5-1) or IG2 (I10-6) - Body ground	10 kΩ or higher

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

Fig 7: Disconnecting I10 Ignition Switch Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR
OK : REPLACE IGNITION COIL ASSY (See ADJUSTMENT )