Dtc P0351 Ignition Coil A Primary / Secondary Circuit

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT IGNITION COIL NO. 1 (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (IGNITION COIL NO. 1 - ECM)

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

DTC P0351 Ignition Coil "A" Primary / Secondary Circuit

DTC P0352 Ignition Coil "B" Primary / Secondary Circuit

DTC P0353 Ignition Coil "C" Primary / Secondary Circuit

DTC P0354 Ignition Coil "D" Primary / Secondary Circuit


DESCRIPTION

HINT:
  1. These DTCs indicate malfunctions relating to the primary circuit.
  2. If DTC P0351 is stored, check ignition coil No. 1 (No. 1 cylinder) circuit.
  3. If DTC P0352 is stored, check ignition coil No. 1 (No. 2 cylinder) circuit.
  4. If DTC P0353 is stored, check ignition coil No. 1 (No. 3 cylinder) circuit.
  5. If DTC P0354 is stored, check ignition coil No. 1 (No. 4 cylinder) 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 No. 1 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 sparks of the spark plugs pass 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.

Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0351 Ignition Coil A Primary / Secondary Circuit


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

  1. Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0351 Ignition Coil A Primary / Secondary Circuit
  2. Reference: Inspection using an oscilloscope.
  3. While cranking or idling the engine, check the waveform between terminals IGT (1 to 4) and E1, and IGF1 and E1 of the ECM connector.
    Item
    		Content
    Terminals
    		CH1: IGT1, IGT2, IGT3, IGT4 - E1
    CH2: IGF1 - E1
    Equipment Settings
    		2 V/DIV
    20 msec./DIV
    Conditions
    		Cranking or idling

MONITOR DESCRIPTION


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0351 Ignition Coil A Primary / Secondary Circuit

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.
If the malfunction is not repaired successfully, a DTC is stored 1 second after the engine is next started.

MONITOR STRATEGY


Related DTCs
P0351: Ignition coil (cylinder 1) malfunction
P0352: Ignition coil (cylinder 2) malfunction
P0353: Ignition coil (cylinder 3) malfunction
P0354: Ignition coil (cylinder 4) malfunction
Required Sensors/Components (Main)
Ignition coil No. 1
Required Sensors/Components (Related)
Crankshaft position sensor
Frequency of Operation
Continuous
Duration
0.512 seconds or more
MIL Operation
Immediate
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


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

TYPICAL MALFUNCTION THRESHOLDS


IGF signal
ECM does not receive any IGF signal despite ECM sending IGT signal to ignition coil No. 1

COMPONENT OPERATING RANGE


IGF signal
Ignition coil No. 1 transmits IGF signal when it receives IGT signal from ECM

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine.
  7. Idle the engine for 10 seconds or more [A].
  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
  9. Read pending DTCs.
    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. If a pending DTC is not output, perform the following procedure.
  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  11. Input the DTC: P0351, P0352, P0353 or P0354.
  12. Check the DTC judgment result.

    Techstream Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. If the result shows INCOMPLETE or N/A, perform steps [A] through [B] again.
  13. If no pending DTC is output, perform a universal trip and check for permanent DTCs (YARIS_NCP93 RM000000PDK0QGX.html).
    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0351 Ignition Coil A Primary / Secondary Circuit


INSPECTION PROCEDURE

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.
1.INSPECT IGNITION COIL NO. 1 (POWER SOURCE)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the ignition coil No. 1 connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Condition
    		Specified Conditions
    GND (C11-4) - Body ground
    		Always
    		Below 1 Ω
    GND (C12-4) - Body ground
    		Always
    		Below 1 Ω
    GND (C13-4) - Body ground
    		Always
    		Below 1 Ω
    GND (C14-4) - Body ground
    		Always
    		Below 1 Ω

  1. Turn the ignition switch to ON.

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

    Standard voltage:
    Tester Connections
    		Switch Condition
    		Specified Conditions
    +B (C11-1) - GND (C11-4)
    		Ignition switch ON
    		11 to 14 V
    +B (C12-1) - GND (C12-4)
    		Ignition switch ON
    		11 to 14 V
    +B (C13-1) - GND (C13-4)
    		Ignition switch ON
    		11 to 14 V
    +B (C14-1) - GND (C14-4)
    		Ignition switch ON
    		11 to 14 V
*a
Front view of wire harness connector
( to Ignition Coil No. 1)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (IGNITION COIL NO. 1 - ECM)

  1. Disconnect the ignition coil No. 1 connector.

  1. Disconnect the C20 ECM connector.

  1. Check the resistance.

    Standard resistance:
    Tester Connections
    		Condition
    		Specified Conditions
    IGF (C11-2) - IGF1 (C20-81)
    		Always
    		Below 1 Ω
    IGF (C12-2) - IGF1 (C20-81)
    		Always
    		Below 1 Ω
    IGF (C13-2) - IGF1 (C20-81)
    		Always
    		Below 1 Ω
    IGF (C14-2) - IGF1 (C20-81)
    		Always
    		Below 1 Ω
    IGT (C11-3) - IGT1 (C20-85)
    		Always
    		Below 1 Ω
    IGT2 (C12-3) - IGT2 (C20-84)
    		Always
    		Below 1 Ω
    IGT3 (C13-3) - IGT3 (C20-83)
    		Always
    		Below 1 Ω
    IGT4 (C14-3) - IGT4 (C20-82)
    		Always
    		Below 1 Ω
    IGF (C11-2) or IGF1 (C20-81) - Body ground
    		Always
    		10 kΩ or higher
    IGF (C12-2) or IGF1 (C20-81) - Body ground
    		Always
    		10 kΩ or higher
    IGF (C13-2) or IGF1 (C20-81) - Body ground
    		Always
    		10 kΩ or higher
    IGF (C14-2) or IGF1 (C20-81) - Body ground
    		Always
    		10 kΩ or higher
    IGT (C11-3) or IGT1 (C20-85) - Body ground
    		Always
    		10 kΩ or higher
    IGT2 (C12-3) or IGT2 (C20-84) - Body ground
    		Always
    		10 kΩ or higher
    IGT3 (C13-3) or IGT3 (C20-83) - Body ground
    		Always
    		10 kΩ or higher
    IGT4 (C14-3) or IGT4 (C20-82) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn the Techstream on.

  1. Clear DTCs (YARIS_NCP93 RM000000PDK0QGX.html).

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

    NOTICE:
    Do not shuffle the connectors.

  1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

  1. Check DTCs displayed on the Techstream.

    Result
    Display (DTC Output)
    		Proceed To
    Same DTC output
    		A
    Different ignition coil DTC output
    		B


B
REPLACE IGNITION COIL NO. 1 (YARIS_NCP93 RM000001EFJ02JX.html)
A

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)