Dtc P0351 Ignition Coil A Primary / Secondary Circuit


DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC OUTPUT

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

CHECK IGNITION COIL ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - INJ NO.2 RELAY)

INSPECT INJ NO.2 RELAY

CHECK HARNESS AND CONNECTOR (INJ NO. 2 RELAY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY(EFI) - INJ NO.2 RELAY)

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

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 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.

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit


DTC No.
DTC Detection Condition
Trouble Area
P0351
P0352
P0353
P0354
No IGF signal is sent to the ECM while the engine is running (1 trip detection logic).
  1. Ignition system
  2. Open or short in IGF1 or IGT (1 to 4) circuit between ignition coil and ECM
  3. No. 1 to No. 4 ignition coil assembly
  4. ECM
  1. Reference: Inspection using an oscilloscope.

  2. Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit
    Items
    		Contents
    Terminals
    		1. IGT1, IGT2, IGT3, IGT4 - E1
    2. IGF1 - E1
    Equipment Settings
    		2 V/DIV, 20 msec./DIV
    Conditions
    		Idling
    HINT:
    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.

MONITOR DESCRIPTION


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. 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


Required Sensors/Components (Main)
Igniter
Required Sensors/Components (Related)
ECM
Frequency of Operation
Continuous

CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. Start the engine.
  7. Idle the engine for 20 seconds or more.
  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  9. Read the 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.

    GTS Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment 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 judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit


INSPECTION PROCEDURE

HINT:
  1. These DTCs indicate malfunctions relating to the primary circuit.
  2. If DTC P0351 is stored, check the No. 1 ignition coil circuit.
  3. If DTC P0352 is stored, check the No. 2 ignition coil circuit.
  4. If DTC P0353 is stored, check the No. 3 ignition coil circuit.
  5. If DTC P0354 is stored, check the No. 4 ignition coil circuit.
  6. Read freeze frame data using the GTS. Freeze frame data records 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.
1.CHECK DTC OUTPUT

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    DTC P0351, P0352, P0353 or P0354 is output
    		A
    DTC P0351, P0352, P0353 and P0354 are output
    		B


B
Go to step 6
A


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

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

  1. Clear the DTCs (LandCruiser RM000000VNG00DX.html).

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

    NOTICE:
    Do not shuffle the connectors.

  1. Perform a simulation test.

  1. Check the DTCs output to the GTS.

    Result
    Result
    		Proceed to
    Same DTC output
    		A
    Different ignition coil assembly DTC output
    		B
    HINT:
    Perform "Inspection After Repair" after replacing the ignition coil (LandCruiser RM000004NJC03XX.html).


B
REPLACE IGNITION COIL ASSEMBLY
A


3.CHECK IGNITION COIL ASSEMBLY (POWER SOURCE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the ignition coil assembly connectors.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C7-1 (+B) - C7-4 (GND)
    		Ignition switch ON
    		11 to 14 V
    C8-1 (+B) - C8-4 (GND)
    		Ignition switch ON
    		11 to 14 V
    C9-1 (+B) - C9-4 (GND)
    		Ignition switch ON
    		11 to 14 V
    C10-1 (+B) - C10-4 (GND)
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Ignition Coil Assembly)


NG
Go to step 6
OK


4.CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

  1. Disconnect the ignition coil assembly connectors.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C7-2 (IGF) - C153-12 (IGF1)
    		Always
    		Below 1 Ω
    C8-2 (IGF) - C153-12 (IGF1)
    		Always
    		Below 1 Ω
    C9-2 (IGF) - C153-12 (IGF1)
    		Always
    		Below 1 Ω
    C10-2 (IGF) - C153-12 (IGF1)
    		Always
    		Below 1 Ω
    C7-2 (IGF) or C153-12 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C8-2 (IGF) or C153-12 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C9-2 (IGF) or C153-12 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C10-2 (IGF) or C153-12 (IGF1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - ECM)
OK


5.CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

  1. Disconnect the ignition coil assembly connectors.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C7-3 (IGT1) - C153-16 (IGT1)
    		Always
    		Below 1 Ω
    C8-3 (IGT2) - C153-15 (IGT2)
    		Always
    		Below 1 Ω
    C9-3 (IGT3) - C153-14 (IGT3)
    		Always
    		Below 1 Ω
    C10-3 (IGT4) - C153-13 (IGT4)
    		Always
    		Below 1 Ω
    C7-3 (IGT1) or C153-16 (IGT1) - Body ground
    		Always
    		10 kΩ or higher
    C8-3 (IGT2) or C153-15 (IGT2) - Body ground
    		Always
    		10 kΩ or higher
    C9-3 (IGT3) or C153-14 (IGT3) - Body ground
    		Always
    		10 kΩ or higher
    C10-3 (IGT4) or C153-13 (IGT4) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - ECM)
OK

REPLACE ECM (LandCruiser RM000000VW203EX.html)

6.CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND)

  1. Disconnect the ignition coil assembly connectors.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C7-4 (GND) - Body ground
    		Always
    		Below 1 Ω
    C8-4 (GND) - Body ground
    		Always
    		Below 1 Ω
    C9-4 (GND) - Body ground
    		Always
    		Below 1 Ω
    C10-4 (GND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND)
OK


7.CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - INJ NO.2 RELAY)

  1. Disconnect the ignition coil assembly connectors.

  1. Remove the INJ NO. 2 relay from the engine room relay block.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C7-1 (+B) - INJ NO. 2 relay terminal 3
    		Always
    		Below 1 Ω
    C8-1 (+B) - INJ NO. 2 relay terminal 3
    		Always
    		Below 1 Ω
    C9-1 (+B) - INJ NO. 2 relay terminal 3
    		Always
    		Below 1 Ω
    C10-1 (+B) - INJ NO. 2 relay terminal 3
    		Always
    		Below 1 Ω
    C7-1 (+B) or INJ NO. 2 relay terminal 3 - Body ground
    		Always
    		10 kΩ or higher
    C8-1 (+B) or INJ NO. 2 relay terminal 3 - Body ground
    		Always
    		10 kΩ or higher
    C9-1 (+B) or INJ NO. 2 relay terminal 3 - Body ground
    		Always
    		10 kΩ or higher
    C10-1 (+B) or INJ NO. 2 relay terminal 3 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.INSPECT INJ NO.2 RELAY

  1. Inspect the INJ NO. 2 relay (LandCruiser RM000003BLB03PX_01_0018.html).



NG
REPLACE INJ NO.2 RELAY
OK


9.CHECK HARNESS AND CONNECTOR (INJ NO. 2 RELAY - BODY GROUND)

  1. Remove the INJ NO. 2 relay from the engine room relay block.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    INJ No. 2 relay terminal 1 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ NO. 2 RELAY - BATTERY)
OK


10.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)

  1. Remove the integration relay from the No. 1 engine room relay block.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    1B-3 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


11.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY(EFI) - INJ NO.2 RELAY)

  1. Remove the NO. 1 integration relay from the engine room relay block.

  1. Remove the INJ NO. 2 relay from the engine room relay block.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    1B-4 - INJ NO. 2 relay terminal 2
    		Always
    		Below 1 Ω
    1B-4 or INJ NO. 2 relay terminal 2 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ECM POWER SOURCE CIRCUIT (LandCruiser RM0000027690EIX.html)