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 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.

PERFORM SIMULATION TEST

Clear the DTC(s) (See DTC CHECK / CLEAR ).
Change the arrangement of the ignition coils (with igniters).
NOTE: Do not change the location of the connectors.
Reform a simulation test.

Result

RESULT REFERENCE

Display (DTC Output)	Proceed to
Same DTCs (that have been erased)	A
Other DTCs	B

B : REPLACE IGNITION COIL ASSEMBLY

A: Go to next step

INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

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

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

Fig 1: Inspecting Ignition Coil Assembly (Power Source)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

IGNITION COIL ASSEMBLY (POWER SOURCE) (VOLTAGE)

Tester Connection	Specified Condition
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

Measure the resistance between the wire harness side connectors.

Standard resistance

IGNITION COIL ASSEMBLY (POWER SOURCE) (RESISTANCE)

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

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go to next step

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

Disconnect the I2, I3, I4, I5, I6 or I7 ignition coil connector.
Disconnect the ECM E8connectors.
Measure the resistance between the wire harness side connectors.

Standard resistance (Check for open)

IGNITION COIL ASSEMBLY - ECM) (CHECK FOR OPEN) (1 OF 2)

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

Standard resistance (Check for short)

IGNITION COIL ASSEMBLY - ECM) (CHECK FOR SHORT) (1 OF 2)

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

Standard resistance (Check for open)

IGNITION COIL ASSEMBLY - ECM) (CHECK FOR OPEN) (2 OF 2)

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

Standard resistance (Check for short)

IGNITION COIL ASSEMBLY - ECM) (CHECK FOR SHORT) (2 OF 2)

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

Fig 2: Checking Harness And Connector (Ignition Coil Assembly - ECM)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go to next step

CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGF1 SIGNAL)

Inspect using an oscilloscope.
Start the engine.
Check the waveform of the ECM connectors.

Standard

ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGF1 SIGNAL)

Tester Connection	Specified Condition
E8-24 (IGF1) - E6-1 (E1) E8-8 (IGT1) - E6-1 (E1) E8-9 (IGT2) - E6-1 (E1) E8-10 (IGT3) - E6-1 (E1) E8-11 (IGT4) - E6-1 (E1) E8-12 (IGT5) - E6-1 (E1) E8-13 (IGT6) - E6-1 (E1)	Correct waveform is shown

Fig 3: Checking ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGF1 Signal)

NG : REPLACE ECM

OK : Go to next step

CHECK IF DTC OUTPUT RECURS

Clear the DTC (See DTC CHECK / CLEAR ).
Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the intelligent tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

Read DTC.

Result

IF DTC OUTPUT RECURS

Display (DTC Output)	Proceed to
P0351, P0352, P0353, P0354, P0355 and/or P0356 are output	A
No output	B

B : SYSTEM OK

A : REPLACE ECM