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

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.

• 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

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.

1. 1
   Connect the Techstream to the DLC3.
2. 2
   Turn the ignition switch to ON and turn the Techstream on.
3. 3
   Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).
4. 4
   Turn the ignition switch off and wait for at least 30 seconds.
5. 5
   Turn the ignition switch to ON and turn the Techstream on.
6. 6
   Start the engine.
7. 7
   Idle the engine for 10 seconds or more [A].
8. 8
   Enter the following menus: Powertrain / Engine / Trouble Codes [B].
9. 9
   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.
10. 10
    Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. 11
    Input the DTC: P0351, P0352, P0353 or P0354.
12. 12
    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.
13. 13
    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.

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. 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):

(c) Turn the ignition switch to ON.

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

Standard Voltage:

NG

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

OK

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

(a) Disconnect the ignition coil connectors.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

Standard Resistance (Check for Short):

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. 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.

(c) Turn the Techstream 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.

HINT:

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

A

REPLACE ECM

B

REPLACE IGNITION COIL