Toyota Venza: Ignition Coil "A" Primary / Secondary Circuit (P0351-P0354)

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Ignition Coil "A" Primary / Secondary Circuit (P0351-P0354)

DESCRIPTION

HINT:

These DTCs indicate malfunctions relating to the primary circuit.
If DTC P0351 is output, check the No. 1 ignition coil circuit.
If DTC P0352 is output, check the No. 2 ignition coil circuit.
If DTC P0353 is output, check the No. 3 ignition coil circuit.
If DTC P0354 is output, check the No. 4 ignition coil circuit.

A Direct Ignition System (DIS) is used on this vehicle.

The DIS is a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil and one spark plug is connected to the end of each secondary wiring. A powerful voltage, generated in the secondary wiring, is applied directly to each spark plug. The spark of the spark plugs passes from the center electrode to the ground electrodes.

The ECM determines the ignition timing and transmits the ignition (IGT) signals to each cylinder. Using the IGT signal, the ECM turns the power transistor inside the igniter on and off. The power transistor, in turn, switches on and off the current to the primary coil. When the current to the primary coil is cut off, a powerful voltage is generated in the secondary coil. This voltage is applied to the spark plugs, causing them to spark inside the cylinders. As the ECM cuts the current to the primary coil, the igniter sends back an ignition confirmation (IGF) signal to the ECM for each cylinder ignition.

DTC No.	DTC Detection Condition	Trouble Area
P0351 P0352 P0353 P0354	No IGF signal to the ECM while the engine is running (1 trip detection logic).	Ignition system Open or short in IGF1 or IGT circuit (1 to 4) between ignition coil and ECM No. 1 to No. 4 ignition coils ECM

DTC No.

DTC Detection Condition

Trouble Area

P0351

P0352

P0353

P0354

No IGF signal to the ECM while the engine is running (1 trip detection logic).

Ignition system
Open or short in IGF1 or IGT circuit (1 to 4) between ignition coil and ECM
No. 1 to No. 4 ignition coils
ECM

Reference: Inspection using an oscilloscope.

While idling the engine, check the waveform between terminals IGT (1 to 4) and E1, and IGF1 and E1 of the ECM connector.

Terminal No. (Symbol)	Tool Setting	Condition
B58-108 (IGT1) - B58-104 (E1)	2 V/DIV, 20 ms/DIV	Idling
B58-107 (IGT2) - B58-104 (E1)	2 V/DIV, 20 ms/DIV	Idling
B58-106 (IGT3) - B58-104 (E1)	2 V/DIV, 20 ms/DIV	Idling
B58-105 (IGT4) - B58-104 (E1)	2 V/DIV, 20 ms/DIV	Idling
B58-23 (IGF1) - B58-104 (E1)	2 V/DIV, 20 ms/DIV	Idling

MONITOR DESCRIPTION

If the ECM does not receive any IGF signals despite transmitting the IGT signal, it interprets this as a fault in the igniter and stores a DTC.

MONITOR STRATEGY

Related DTCs	P0351: Igniter (Cylinder 1) Circuit/Open P0352: Igniter (Cylinder 2) Circuit/Open P0353: Igniter (Cylinder 3) Circuit/Open P0354: Igniter (Cylinder 4) Circuit/Open
Required Sensors/Components (Main)	Igniter
Required Sensors/Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous
Duration	-
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	A, B, C and D
A. Spark cut	Not operating
B. Either of the following conditions is met	(a) or (b)
(a) Engine speed	1500 rpm or less
(b) Starter	OFF
Either of the following conditions is met	C or D
C. Both of the following conditions is met	(a) and (b)
(a) Engine speed	500 rpm or less
(b) Battery voltage	6 V or higher
D. All of the following conditions are met	(a), (b) and (c)
(a) Engine speed	More than 500 rpm
(b) Battery voltage	10 V or higher
(c) Number of sparks after CPU is reset	5 sparks or more

TYPICAL MALFUNCTION THRESHOLDS

All of the following conditions are met	A, B, C and D
A. Ignition signal fail counter	More than 2 times
B. Time after condition A is met	0.256 seconds or more
C. Ignition signal fail counter after condition B is met	More than 2 times
D. Ignition switch	ON

COMPONENT OPERATING RANGE

Confirmed ignition signal input when ignition signal is on to off

2 times

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).

Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the Techstream on.
Start the engine.
Idle the engine for 10 seconds or more [A].
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read the Pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P0351, P0352, P0353 or P0354.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

HINT:

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.

If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Read freeze frame data using the Techstream. 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 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.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (IG2 RELAY - IGNITION COIL, IGNITION COIL - BODY GROUND)

(a) Disconnect the ignition coil connectors.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
B48-4 (GND) - Body ground	Always	Below 1 Ω
B49-4 (GND) - Body ground	Always	Below 1 Ω
B50-4 (GND) - Body ground	Always	Below 1 Ω
B51-4 (GND) - Body ground	Always	Below 1 Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
B48-1 (+B) - B48-4 (GND)	Ignition switch ON	11 to 14 V
B49-1 (+B) - B49-4 (GND)	Ignition switch ON	11 to 14 V
B50-1 (+B) - B50-4 (GND)	Ignition switch ON	11 to 14 V
B51-1 (+B) - B51-4 (GND)	Ignition switch ON	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - IGNITION COIL, IGNITION COIL - BODY GROUND)

2.	CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM)

(a) Disconnect the ignition coil connectors.

(b) Disconnect the ECM connector.

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
B48-2 (IGF) - B58-23 (IGF1)	Always	Below 1 Ω
B49-2 (IGF) - B58-23 (IGF1)	Always	Below 1 Ω
B50-2 (IGF) - B58-23 (IGF1)	Always	Below 1 Ω
B51-2 (IGF) - B58-23 (IGF1)	Always	Below 1 Ω

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
B48-3 (IGT1) - B58-108 (IGT1)	Always	Below 1 Ω
B49-3 (IGT2) - B58-107 (IGT2)	Always	Below 1 Ω
B50-3 (IGT3) - B58-106 (IGT3)	Always	Below 1 Ω
B51-3 (IGT4) - B58-105 (IGT4)	Always	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
B48-2 (IGF) or B58-23 (IGF1) - Body ground	Always	10 kΩ or higher
B49-2 (IGF) or B58-23 (IGF1) - Body ground	Always	10 kΩ or higher
B50-2 (IGF) or B58-23 (IGF1) - Body ground	Always	10 kΩ or higher
B51-2 (IGF) or B58-23 (IGF1) - Body ground	Always	10 kΩ or higher

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
B48-3 (IGT1) or B58-108 (IGT1) - Body ground	Always	10 kΩ or higher
B49-3 (IGT2) or B58-107 (IGT2) - Body ground	Always	10 kΩ or higher
B50-3 (IGT3) or B58-106 (IGT3) - Body ground	Always	10 kΩ or higher
B51-3 (IGT4) or B58-105 (IGT4) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Clear the DTCs (See page ).

(e) Turn the ignition switch off and wait for at least 30 seconds.

(f) Shuffle the arrangement of the ignition coils with igniters (among No. 1 to No. 4 cylinders).

NOTICE:

Do not shuffle the connectors.

(g) Perform a simulation test.

(h) Enter the following menus: Powertrain / Engine / Trouble Codes.

(i) Read the DTCs.

Result	Proceed to
Same DTC output	A
Different ignition coil DTC output	B

HINT:

Perform "Inspection After Repair" after replacing the ignition coil (See page ).

REPLACE ECM

REPLACE IGNITION COIL

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