SFI SYSTEM, Diagnostic DTC:P0351, P0352, P0353, P0354, P0355, P0356

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 assembly, 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 electrodes 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 cranking or idling the engine, check the waveform between terminals IGT (1 to 6) and E1, and IGF1 and E1 of the ECM connector.

  Item	Content
  Terminal	CH1: IGT1, IGT2, IGT3, IGT4, IGT5, IGT6 - E1 CH2: IGF1 - E1
  Equipment Setting	2 V/DIV. 20 msec./DIV.
  Condition	Cranking or 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.

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

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

   

   Text in Illustration

   *a	Front view of wire harness connector (to Ignition Coil Assembly)

   
   

   1. Disconnect the ignition coil assembly connector.

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

      Standard Resistance (Check for Open)
      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 C11-4 (GND) - Body ground Always Below 1 Ω C12-4 (GND) - Body ground Always Below 1 Ω

   3. 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 C11-1 (+B) - C11-4 (GND) Ignition switch ON 11 to 14 V C12-1 (+B) - C12-4 (GND) Ignition switch ON 11 to 14 V

   4. Reconnect the ignition coil assembly connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

   1. Disconnect the ignition coil assembly connector.

   2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition C7-2 (IGF) - C36-6 (IGF1) Always Below 1 Ω C8-2 (IGF) - C36-6 (IGF1) Always Below 1 Ω C9-2 (IGF) - C36-6 (IGF1) Always Below 1 Ω C10-2 (IGF) - C36-6 (IGF1) Always Below 1 Ω C11-2 (IGF) - C36-6 (IGF1) Always Below 1 Ω C12-2 (IGF) - C36-6 (IGF1) Always Below 1 Ω C7-3 (IGT1) - C36-24 (IGT1) Always Below 1 Ω C8-3 (IGT2) - C36-25 (IGT2) Always Below 1 Ω C9-3 (IGT3) - C36-26 (IGT3) Always Below 1 Ω C10-3 (IGT4) - C36-27 (IGT4) Always Below 1 Ω C11-3 (IGT5) - C36-28 (IGT5) Always Below 1 Ω C12-3 (IGT6) - C35-25 (IGT6) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition C7-2 (IGF) or C36-6 (IGF1) - Body ground Always 10 kΩ or higher C8-2 (IGF) or C36-6 (IGF1) - Body ground Always 10 kΩ or higher C9-2 (IGF) or C36-6 (IGF1) - Body ground Always 10 kΩ or higher C10-2 (IGF) or C36-6 (IGF1) - Body ground Always 10 kΩ or higher C11-2 (IGF) or C36-6 (IGF1) - Body ground Always 10 kΩ or higher C12-2 (IGF) or C36-6 (IGF1) - Body ground Always 10 kΩ or higher C7-3 (IGT1) or C36-24 (IGT1) - Body ground Always 10 kΩ or higher C8-3 (IGT2) or C36-25 (IGT2) - Body ground Always 10 kΩ or higher C9-3 (IGT3) or C36-26 (IGT3) - Body ground Always 10 kΩ or higher C10-3 (IGT4) or C36-27 (IGT4) - Body ground Always 10 kΩ or higher C11-3 (IGT5) or C36-28 (IGT5) - Body ground Always 10 kΩ or higher C12-3 (IGT6) or C35-25 (IGT6) - Body ground Always 10 kΩ or higher

   4. Reconnect the ignition coil assembly connector.

   5. Reconnect the ECM connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353, P0354, P0355 OR P0356)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON and turn the tester on.

   3. Clear the DTCs Click here.

   4. Shuffle the arrangement of the ignition coil assembly (among No. 1 to No. 6 cylinders).

      Note

      Do not shuffle the connectors.

   5. Perform a simulation test.

   6. Check the DTCs output on the tester.

      Result

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

   
   

   B

   REPLACE IGNITION COIL ASSEMBLY Click here

   A

   REPLACE ECM Click here