SFI SYSTEM Ignition Circuit

DESCRIPTION

A direct ignition system is used on this vehicle. The direct ignition system is a 1 cylinder ignition system which ignites one cylinder with one ignition coil. In the 1 cylinder ignition system, one spark plug is connected to the end of the secondary winding. High voltage is generated in the secondary winding and is applied directly to the spark plug. The spark of the spark plug passes from the center electrode to the ground electrode.

The ECM determines the ignition timing and transmits the ignition signals for each cylinder. Using the ignition signal, the ECM turns on and off the power transistor inside the igniter, which switches on and off a current to the primary coil. When the current to the primary coil is cut off, high voltage is generated in the secondary coil and this voltage is applied to the spark plugs to create sparks inside the cylinders.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL ASSEMBLY)

   

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

   
   

   1. Disconnect the ignition coil assembly connectors.

   2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition D92-1 (+B) - D92-4 (GND) Engine switch on (IG) 11 to 14 V D93-1 (+B) - D93-4 (GND) Engine switch on (IG) 11 to 14 V D94-1 (+B) - D94-4 (GND) Engine switch on (IG) 11 to 14 V D95-1 (+B) - D95-4 (GND) Engine switch on (IG) 11 to 14 V D96-1 (+B) - D96-4 (GND) Engine switch on (IG) 11 to 14 V D97-1 (+B) - D97-4 (GND) Engine switch on (IG) 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

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

   OK

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

   
   

   1. Disconnect the ignition coil assembly connectors.

   2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection Condition Specified Condition D92-3 (IGT1) - D110-71 (IGT1) Always Below 1 Ω D93-3 (IGT2) - D110-36 (IGT2) Always Below 1 Ω D94-3 (IGT3) - D110-70 (IGT3) Always Below 1 Ω D95-3 (IGT4) - D110-35 (IGT4) Always Below 1 Ω D96-3 (IGT5) - D110-69 (IGT5) Always Below 1 Ω D97-3 (IGT6) - D110-34 (IGT6) Always Below 1 Ω D92-2 (IGF1) - D110-112 (IGF1) Always Below 1 Ω D93-2 (IGF2) - D110-80 (IGF2) Always Below 1 Ω D94-2 (IGF1) - D110-112 (IGF1) Always Below 1 Ω D95-2 (IGF2) - D110-80 (IGF2) Always Below 1 Ω D96-2 (IGF1) - D110-112 (IGF1) Always Below 1 Ω D97-2 (IGF2) - D110-80 (IGF2) Always Below 1 Ω D92-3 (IGT1) or D110-71 (IGT1) - Body ground and other terminals Always 10 kΩ or higher D93-3 (IGT2) or D110-36 (IGT2) - Body ground and other terminals Always 10 kΩ or higher D94-3 (IGT3) or D110-70 (IGT3) - Body ground and other terminals Always 10 kΩ or higher D95-3 (IGT4) or D110-35 (IGT4) - Body ground and other terminals Always 10 kΩ or higher D96-3 (IGT5) or D110-69 (IGT5) - Body ground and other terminals Always 10 kΩ or higher D97-3 (IGT6) or D110-34 (IGT6) - Body ground and other terminals Always 10 kΩ or higher D92-2 (IGF1) or D110-112 (IGF1) - Body ground and other terminals Always 10 kΩ or higher D93-2 (IGF2) or D110-80 (IGF2) - Body ground and other terminals Always 10 kΩ or higher D94-2 (IGF1) or D110-112 (IGF1) - Body ground and other terminals Always 10 kΩ or higher D95-2 (IGF2) or D110-80 (IGF2) - Body ground and other terminals Always 10 kΩ or higher D96-2 (IGF1) or D110-112 (IGF1) - Body ground and other terminals Always 10 kΩ or higher D97-2 (IGF2) or D110-80 (IGF2) - Body ground and other terminals Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE ECM Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

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

   
   

   1. Disconnect the ignition coil assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition D92-4 (GND) - Body ground Always Below 1 Ω D93-4 (GND) - Body ground Always Below 1 Ω D94-4 (GND) - Body ground Always Below 1 Ω D95-4 (GND) - Body ground Always Below 1 Ω D96-4 (GND) - Body ground Always Below 1 Ω D97-4 (GND) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. CHECK HARNESS AND CONNECTOR (IG2 RELAY - IGNITION COIL ASSEMBLY)

   
   

   1. Disconnect the IG2 relay from No. 1 engine room relay block.

   2. Disconnect the ignition coil assembly connectors.

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

      Standard Resistance

      Tester Connection Condition Specified Condition 3 (IG2 relay) - D92-1 (+B) Always Below 1 Ω 3 (IG2 relay) - D93-1 (+B) Always Below 1 Ω 3 (IG2 relay) - D94-1 (+B) Always Below 1 Ω 3 (IG2 relay) - D95-1 (+B) Always Below 1 Ω 3 (IG2 relay) - D96-1 (+B) Always Below 1 Ω 3 (IG2 relay) - D97-1 (+B) Always Below 1 Ω 3 (IG2 relay) or D92-1 (+B) - Body ground and other terminals Always 10 kΩ or higher 3 (IG2 relay) or D93-1 (+B) - Body ground and other terminals Always 10 kΩ or higher 3 (IG2 relay) or D94-1 (+B) - Body ground and other terminals Always 10 kΩ or higher 3 (IG2 relay) or D95-1 (+B) - Body ground and other terminals Always 10 kΩ or higher 3 (IG2 relay) or D96-1 (+B) - Body ground and other terminals Always 10 kΩ or higher 3 (IG2 relay) or D97-1 (+B) - Body ground and other terminals Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   OK

   GO TO ECM POWER SOURCE CIRCUIT Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR