Dtc P0351 Ignition Coil A Primary / Secondary Circuit

Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM SIMULATION TEST

INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM (IGT SIGNAL TERMINAL))

CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGF1, IGF2 SIGNAL)

CHECK IF DTC OUTPUT RECURS

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

DTC P0355 Ignition Coil "E" Primary / Secondary Circuit

DTC P0356 Ignition Coil "F" Primary / Secondary Circuit

DESCRIPTION

  • HINT:
These DTCs indicate malfunctions relating to the primary circuit.
IF DTC P0351 is set, check No. 1 ignition coil circuit.
IF DTC P0352 is set, check No. 2 ignition coil circuit.
IF DTC P0353 is set, check No. 3 ignition coil circuit.
IF DTC P0354 is set, check No. 4 ignition coil circuit.
IF DTC P0355 is set, check No. 5 ignition coil circuit.
IF DTC P0356 is set, check No. 6 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 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 signals (IGT) 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 signal (IGF) to the ECM, for each cylinder ignition.


Dtc P0351 Ignition Coil A Primary / Secondary Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

DTC No. DTC Detection ConditionTrouble Area
P0351
P0352
P0353
P0354
P0355
P0356		No IGF signal to ECM while engine running
(1 trip detection logic)
Ignition system
Open or short in IGF1, IGF2 or IGT circuit (1 to 6) between ignition coil and ECM
No. 1 to No. 6 ignition coils
ECM
Dtc P0351 Ignition Coil A Primary / Secondary Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20
Reference: Inspection using an oscilloscope.
While cranking or idling the engine, check the waveform between terminals IGT (1 to 6) and E1, and IGF1, IGF2 and E1 of the ECM connector.
ItemContent
TerminalsCH1: IGT1, IGT2, IGT3, IGT4, IGT5, IGT6 - E1
CH2: IGF1, IGF2 - E1
Equipment Settings2 V/DIV.
20 ms./DIV.
ConditionsCranking or idling

WIRING DIAGRAM

Dtc P0351 Ignition Coil A Primary / Secondary Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Dtc P0351 Ignition Coil A Primary / Secondary Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

  • HINT:
  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. 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 .
1.PERFORM SIMULATION TEST

Clear the DTC(s) .

Change the arrangement of the ignition coils (with igniters).

  • NOTICE:
  • Do not change the location of the connectors.

Reform a simulation test.

  • Result:
  • Display (DTC Output)Proceed to
    Same DTCs (that have been erased)A
    Other DTCsB
B
REPLACE IGNITION COIL ASSEMBLY
A
2.INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)
Dtc P0351 Ignition Coil A Primary / Secondary Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E22, E32, E23, Z1, E24 or Z2 ignition coil connector.

Turn the engine switch on (IG).

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

  • Standard voltage:
  • Tester ConnectionSpecified Condition
    E22-1 - Body ground9 to 14 V
    E32-1 - Body ground9 to 14 V
    E23-1 - Body ground9 to 14 V
    Z1-1 - Body ground9 to 14 V
    E24-1 - Body ground9 to 14 V
    Z2-1 - Body ground9 to 14 V

Measure the resistance of the wire harness side connectors.

  • Standard resistance:
  • Tester ConnectionSpecified Condition
    E22-4 - Body groundBelow 1 Ω
    E32-4 - Body groundBelow 1 Ω
    E23-4 - Body groundBelow 1 Ω
    Z1-4 - Body groundBelow 1 Ω
    E24-4 - Body groundBelow 1 Ω
    Z2-4 - Body groundBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3.CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM (IGT SIGNAL TERMINAL))
Dtc P0351 Ignition Coil A Primary / Secondary Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E22, E32, E23, Z1, E24 or Z2 ignition coil connector.

Disconnect the ECM E5 and E3 connectors.

Measure the resistance of the wire harness side connectors.

  • Standard resistance (Check for open):
  • Tester ConnectionSpecified Condition
    IGT1 (E22-3) - IGT1 (E5-13)Below 1 Ω
    IGT2 (E32-3) - IGT2 (E3-17)Below 1 Ω
    IGT3 (E23-3) - IGT3 (E5-10)Below 1 Ω
    IGT4 (Z1-3) - IGT4 (E5-12)Below 1 Ω
    IGT5 (E24-3) - IGT5 (E3-27)Below 1 Ω
    IGT6 (Z2-3) - IGT6 (E3-26)Below 1 Ω
  • Standard resistance (Check for short):
  • Tester ConnectionSpecified Condition
    IGT1 (E22-3) or IGT1 (E5-13) - Body ground10 kΩ or higher
    IGT2 (E32-3) or IGT2 (E3-17) - Body ground10 kΩ or higher
    IGT3 (E23-3) or IGT3 (E5-10) - Body ground10 kΩ or higher
    IGT4 (Z1-3) or IGT4 (E5-12) - Body ground10 kΩ or higher
    IGT5 (E24-3) or IGT5 (E3-27) - Body ground10 kΩ or higher
    IGT6 (Z2-3) or IGT6 (E3-26) - Body ground10 kΩ or higher
  • Standard resistance (Check for open):
  • Tester ConnectionSpecified Condition
    IGF1 (E22-2) - IGF1 (E5-7)Below 1 Ω
    IGF2 (E32-2) - IGF2 (E5-6)Below 1 Ω
    IGF3 (E23-2) - IGF1 (E5-7)Below 1 Ω
    IGF4 (Z1-2) - IGF2 (E5-6)Below 1 Ω
    IGF5 (E24-2) - IGF1 (E5-7)Below 1 Ω
    IGF6 (Z2-2) - IGF2 (E5-6)Below 1 Ω
  • Standard resistance (Check for short):
  • Tester ConnectionSpecified Condition
    IGF1 (E22-2) or IGF1 (E5-7) - Body ground10 kΩ or higher
    IGF2 (E32-2) or IGF2 (E5-6) - Body ground10 kΩ or higher
    IGF3 (E23-2) or IGF1 (E5-7)- Body ground10 kΩ or higher
    IGF4 (Z1-2) or IGF2 (E5-6) - Body ground10 kΩ or higher
    IGF5 (E24-2) or IGF1 (E5-7) - Body ground10 kΩ or higher
    IGF6 (Z2-2) or IGF2 (E5-6) - Body ground10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4.CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGF1, IGF2 SIGNAL)
Dtc P0351 Ignition Coil A Primary / Secondary Circuit. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Inspect the ECM using an oscilloscope.

While cranking or idling, check the waveform of the ECM connectors.

  • Standard:
  • Tester ConnectionSpecified Condition
    IGF1 (E5-7) - E1 (E4-7)
    IGF2 (E5-6) - E1 (E4-7)
    IGT1 (E5-13) - E1 (E4-7)
    IGT2 (E3-17) - E1 (E4-7)
    IGT3 (E5-10) - E1 (E4-7)
    IGT4 (E5-12) - E1 (E4-7)
    IGT5 (E3-27) - E1 (E4-7)
    IGT6 (E3-26) - E1 (E4-7)    		Correct waveform is shown
NG
REPLACE ECM
OK
5.CHECK IF DTC OUTPUT RECURS

Clear the DTC .

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG) and turn the intelligent tester ON.

Enter the following menus: Power train / Engine / DTC.

Read DTC.

  • Result:
  • Display (DTC Output)Proceed to
    P0351, P0352, P0353, P0354, P0355 and/or P0356 are outputA
    No outputB
B
SYSTEM IS OK
A
REPLACE ECM