Inspection Procedure

HINT:

Read freeze frame data using an intelligent tester or OBD II scan tool. 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 WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354)

Connect an intelligent 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 RESULT DESCRIPTION

Display (DTC Output)	Proceed to
P0351, P0352, P0353 or P0354	A
Any other DTCs	B

B: REPLACE IGNITION COIL ASSEMBLY

A: Go to Next Step

INSPECT ECM (IGT1, IGT2, IGT3, IGT4 AND IGF1 SIGNAL)

Inspect the ECM using an oscilloscope.

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

Standard

TESTER CONNECTIONS AND SPECIFIED CONDITIONS

Tester Connections	Specified Conditions
IGT1 (E3-8) - E1 (E3-5)	Correct waveform is as shown
IGT2 (E3-9) - E1 (E3-5)	Correct waveform is as shown
IGT3 (E3-10) - E1 (E3-5)	Correct waveform Is as shown
IGT4 (E3-11) - E1 (E3-5)	Correct waveform is as shown
IGF1 (E3-24) - E1 (E3-5)	Correct waveform is as shown

NG: REPLACE ECM

Fig 1: Identifying E3 ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to Next Step

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

Disconnect the 12, 13,14 or 15 ignition coil with igniter connector.
Disconnect the E3 ECM connector.

Check the resistance.

Standard resistance (Check for open)

STANDARD RESISTANCE SPECIFICATIONS FOR OPEN

Tester Connections	Specified Conditions
IGF (I2-2) - IGF1 (E3-24)	Below 1 Ω
IGF (I3-2) - IGF1 (E3-24)	Below 1 Ω
IGF (I4-2) - IGF1 (E3-24)	Below 1 Ω
IGF (I5-2) - IGF1 (E3-24)	Below 1 Ω

Standard resistance (Check for open)

STANDARD 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

Fig 2: Identifying Ignition Coil With Igniter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance (Check for short)

STANDARD RESISTANCE SPECIFICATIONS (FOR SHORT)

Tester Connections	Specified Conditions
IGF (I2-2) or IGF1 (E3-24) - Body ground	10 kΩ or higher
IGF (I3-2) or IGF1 (E3-24) - Body ground	10 kΩ or higher
IGF (I4-2) or IGF1 (E3-24) - Body ground	10 kΩ or higher
IGF (I5-2) or IGF1 (E3-24) - Body ground	10 kΩ or higher

Standard resistance (Check for short)

STANDARD 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 ASSEMBLY (POWER SOURCE)

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

Check the resistance.

Standard resistance (Check for open)

STANDARD RESISTANCE SPECIFICATIONS 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 3: Identifying Ignition Coil With Igniter Connector Terminals

Turn the ignition switch to ON.

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

Standard voltage

STANDARD VOLTAGE SPECIFICATIONS

Tester Connections	Specified Conditions
+B (I2-1) - GND (I2-4)	Between 9 V and 14 V
+B (I3-1) - GND (I3-)	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: REPLACE IGNITION COIL ASSEMBLY

OK : Go to Next Step

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

Disconnect the I2, I3, I4 or I5 ignition coil with igniter connector.
Disconnect the I11 ignition switch connector.

Check the resistance.

Standard resistance (Check for open)

STANDARD RESISTANCE SPECIFICATIONS FOR OPEN

Tester Connections	Specified Conditions
+B (I2-1) - IG2 (I11-6)	Below 1 Ω
+B (I3-1) - IG2 (I11-6)	Below 1 Ω
+B (I4-1) - IG2 (I11-6)	Below 1 Ω
+B (I5-1) - IG2 (I11-6)	Below 1 Ω

Standard resistance (Check for short)

STANDARD RESISTANCE SPECIFICATIONS (FOR SHORT)

Tester Connections	Specified Conditions
+B (I2-1) or IG2 (I11-6) - Body ground	10 kΩ or higher
+B (I3-1) or IG2 (I11-6) - Body ground	10 kΩ or higher
+B (I4-1) or IG2 (I11-6) - Body ground	10 kΩ or higher
+B (I5-1) or IG2 (I11-6) - Body ground	10 kΩ or higher

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

Fig 4: Checking Harness And Connector (Ignition Coil Assembly - Ignition Switch)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : REPLACE IGNITION COIL ASSEMBLY