СИСТЕМА SFI, Diagnostic DTC:P0351, P0352, P0353, P0354

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.

• 

• Reference: Inspection using an oscilloscope.

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

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK IGNITION COIL ASSEMBLY (POWER SOURCE)

   

   1. Disconnect the B28 to B31 ignition coil connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition B28-4 (GND) - Body ground Always Below 1 Ω B29-4 (GND) - Body ground B30-4 (GND) - Body ground B31-4 (GND) - Body ground

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition B28-1 (+B) - B28-4 (GND) Engine switch on (IG) 11 to 14 V B29-1 (+B) - B29-4 (GND) B30-1 (+B) - B30-4 (GND) B31-1 (+B) - B31-4 (GND)

      Text in Illustration

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

   4. Reconnect the ignition coil connectors.

   NG

   CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - INTEGRATION RELAY) Click here

   OK

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

   

   1. Disconnect the B28 to B31 ignition coil connectors.

   2. Disconnect the B39 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 B28-2 (IGF) - B39-81 (IGF1) Always Below 1 Ω B29-2 (IGF) - B39-81 (IGF1) B30-2 (IGF) - B39-81 (IGF1) B31-2 (IGF) - B39-81 (IGF1)

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition B28-3 (IGT1) - B39-85 (IGT1) Always Below 1 Ω B29-3 (IGT2) - B39-84 (IGT2) B30-3 (IGT3) - B39-83 (IGT3) B31-3 (IGT4) - B39-82 (IGT4)

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition B28-2 (IGF) or B39-81 (IGF1) - Body ground Always 10 kΩ or higher B29-2 (IGF) or B39-81 (IGF1) - Body ground B30-2 (IGF) or B39-81 (IGF1) - Body ground B31-2 (IGF) or B39-81 (IGF1) - Body ground

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition B28-3 (IGT1) or B39-85 (IGT1) - Body ground Always 10 kΩ or higher B29-3 (IGT2) or B39-84 (IGT2) - Body ground B30-3 (IGT3) or B39-83 (IGT3) - Body ground B31-3 (IGT4) or B39-82 (IGT4) - Body ground

      Text in Illustration

      *1	Front view of wire harness connector (to Ignition Coil)
      *2	Front view of wire harness connector (to ECM)

   4. Reconnect the ECM connector.

   5. Reconnect the ignition coil connectors.

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   1. Connect the intelligent tester to the DLC3.

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

   3. Clear DTCs Click here.

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

      Note

      Do not shuffle the connectors.

   5. Perform a simulation test.

   6. Check the DTCs displayed on the tester.

      Result

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

   B

   REPLACE IGNITION COIL ASSEMBLY Click here

   A

   REPLACE ECM Click here

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

   1. Disconnect the B28 to B31 ignition coil connectors.

      

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

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition B28-1 (+B) - 1A-4 Always Below 1 Ω B29-1 (+B) - 1A-4 B30-1 (+B) - 1A-4 B31-1 (+B) - 1A-4

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition B28-1 (+B) or 1A-4 - Body ground Always 10 kΩ or higher B29-1 (+B) or 1A-4 - Body ground B30-1 (+B) or 1A-4 - Body ground B31-1 (+B) or 1A-4 - Body ground

      Text in Illustration

      *1	Front view of wire harness connector (to Ignition Coil)
      *2	Front view of wire harness connector (to Integration Relay)
      *3	Engine Room No. 1 Relay Block

   4. Reinstall the integration relay.

   5. Reconnect the ignition coil connectors.

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   CHECK ECM POWER SOURCE CIRCUIT Click here