RM38N0EC _51 Engine / Hybrid System _111785 M20C-FKS, M20D-FKS ENGINE CONTROL _0504416 SFI SYSTEM J

M20C-FKS, M20D-FKS ENGINE CONTROL  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

A402877E26
3.385,1.354 5.177,1.75 1.792,0.396 10 false C45 3.344,1.51 5.833,1.885 2.49,0.375 10 false Ignition Coil Assembly (No. 1 Cylinder) 3.344,3.125 6.271,3.406 2.927,0.281 10 false Ignition Coil Assembly (No. 2 Cylinder) 3.344,2.979 5.135,3.375 1.792,0.396 10 false C46 3.323,4.729 5.823,5.219 2.5,0.49 10 false Ignition Coil Assembly (No. 3 Cylinder) 3.365,4.573 5.156,4.969 1.792,0.396 10 false C47 3.281,6.354 5.719,6.635 2.438,0.281 10 false Ignition Coil Assembly (No. 4 Cylinder) 3.313,6.208 5.104,6.604 1.792,0.396 10 false C48 0.375,2.344 1.219,2.698 0.844,0.354 10 false IGP 1.396,1.531 2.24,1.885 0.844,0.354 10 false IGP 5.781,0.573 6.323,0.875 0.542,0.302 10 false IGT1 5.792,2.198 6.333,2.5 0.542,0.302 10 false IGT2 5.792,3.781 6.333,4.083 0.542,0.302 10 false IGT3 5.792,5.292 6.333,5.594 0.542,0.302 10 false IGT4 6.208,6.365 6.75,6.667 0.542,0.302 10 false ECM 6.208,6.208 6.75,6.51 0.542,0.302 10 false C115 2.198,0.833 3.042,1.188 0.844,0.354 10 false INJ 1.021,3.094 2.844,3.573 1.823,0.479 10 false from Certification ECU (Smart Key ECU Assembly) 0.552,4.958 1.396,5.313 0.844,0.354 10 false Battery 1.094,0.573 1.938,0.927 0.844,0.354 10 false 5 1.094,1.073 1.938,1.427 0.844,0.354 10 false 2 1.865,0.573 2.708,0.927 0.844,0.354 10 false 3 1.854,1.083 2.698,1.438 0.844,0.354 10 false 1 3.781,0.563 4.625,0.917 0.844,0.354 10 false 1 3.792,0.885 4.635,1.24 0.844,0.354 10 false 3 4.896,0.583 5.74,0.938 0.844,0.354 10 false 2 3.969,0.688 4.813,1.042 0.844,0.354 10 false +B 3.979,1.01 4.823,1.365 0.844,0.354 10 false GND 4.51,0.698 5.354,1.052 0.844,0.354 10 false IGT1 3.979,2.292 4.823,2.646 0.844,0.354 10 false +B 3.969,3.885 4.813,4.24 0.844,0.354 10 false +B 3.979,5.406 4.823,5.76 0.844,0.354 10 false +B 3.979,2.625 4.823,2.979 0.844,0.354 10 false GND 3.969,4.208 4.813,4.563 0.844,0.354 10 false GND 3.979,5.823 4.823,6.177 0.844,0.354 10 false GND 4.51,2.313 5.354,2.667 0.844,0.354 10 false IGT2 4.5,3.906 5.344,4.26 0.844,0.354 10 false IGT3 4.5,5.427 5.344,5.781 0.844,0.354 10 false IGT4 3.792,2.188 4.635,2.542 0.844,0.354 10 false 1 3.792,3.771 4.635,4.125 0.844,0.354 10 false 1 3.792,5.292 4.635,5.646 0.844,0.354 10 false 1 3.792,2.51 4.635,2.865 0.844,0.354 10 false 3 3.792,4.083 4.635,4.438 0.844,0.354 10 false 3 3.792,5.698 4.635,6.052 0.844,0.354 10 false 3 4.896,2.198 5.74,2.552 0.844,0.354 10 false 2 4.896,3.781 5.74,4.135 0.844,0.354 10 false 2 4.906,5.292 5.75,5.646 0.844,0.354 10 false 2 5.458,0.583 6.302,0.938 0.844,0.354 10 false 107 5.469,3.781 6.313,4.135 0.844,0.354 10 false 105 5.448,5.302 6.292,5.656 0.844,0.354 10 false 104 0.344,4.01 1.417,4.208 1.073,0.198 10 false FL MAIN 5.458,2.198 6.302,2.552 0.844,0.354 10 false 106

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.


HINT:

Perform a spark test first. If none of the cylinders spark, or if only some cylinders do not spark, check this circuit to determine if the ignition coil and spark plug are normal.

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>IGNITION SYSTEM>ON-VEHICLE INSPECTION


PROCEDURE

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

Disconnect the ignition coil assembly connectors.


b.

Turn the ignition switch to ON.


c.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition

Click Location & Routing(C45,C46,C47,C48)Location & Routing

Click Connector(C45)Engine Compartment>Engine Wire>No. 1 Ignition Coil Assembly

Click Connector(C46)Engine Compartment>Engine Wire>No. 2 Ignition Coil Assembly

Click Connector(C47)Engine Compartment>Engine Wire>No. 3 Ignition Coil Assembly

Click Connector(C48)Engine Compartment>Engine Wire>No. 4 Ignition Coil Assembly

C45-1 (+B) - C45-3 (GND) Ignition switch ON 11 to 14 V
C46-1 (+B) - C46-3 (GND) Ignition switch ON 11 to 14 V
C47-1 (+B) - C47-3 (GND) Ignition switch ON 11 to 14 V
C48-1 (+B) - C48-3 (GND) Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

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

Disconnect the ignition coil assembly connectors.


b.

Disconnect the ECM connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(C45,C115,C46,C47,C48)Location & Routing

Click Connector(C45)Engine Compartment>Engine Wire>No. 1 Ignition Coil Assembly

Click Connector(C115)Engine Compartment>Engine Wire>ECM

Click Connector(C46)Engine Compartment>Engine Wire>No. 2 Ignition Coil Assembly

Click Connector(C47)Engine Compartment>Engine Wire>No. 3 Ignition Coil Assembly

Click Connector(C48)Engine Compartment>Engine Wire>No. 4 Ignition Coil Assembly

C45-2 (IGT1) - C115-107 (IGT1) Always Below 1 Ω
C46-2 (IGT2) - C115-106 (IGT2) Always Below 1 Ω
C47-2 (IGT3) - C115-105 (IGT3) Always Below 1 Ω
C48-2 (IGT4) - C115-104 (IGT4) Always Below 1 Ω
C45-2 (IGT1) or C115-107 (IGT1) - Body ground and other terminals Always 10 kΩ or higher
C46-2 (IGT2) or C115-106 (IGT2) - Body ground and other terminals Always 10 kΩ or higher
C47-2 (IGT3) or C115-105 (IGT3) - Body ground and other terminals Always 10 kΩ or higher
C48-2 (IGT4) or C115-104 (IGT4) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the ignition coil assembly connectors.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(C45,C46,C47,C48)Location & Routing

Click Connector(C45)Engine Compartment>Engine Wire>No. 1 Ignition Coil Assembly

Click Connector(C46)Engine Compartment>Engine Wire>No. 2 Ignition Coil Assembly

Click Connector(C47)Engine Compartment>Engine Wire>No. 3 Ignition Coil Assembly

Click Connector(C48)Engine Compartment>Engine Wire>No. 4 Ignition Coil Assembly

C45-3 (GND) - Body ground Always Below 1 Ω
C46-3 (GND) - Body ground Always Below 1 Ω
C47-3 (GND) - Body ground Always Below 1 Ω
C48-3 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Remove the IGP relay from No. 1 engine room relay block and No. 1 junction block assembly.


b.

Disconnect the ignition coil assembly connectors.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(C45,C46,C47,C48)Location & Routing

Click Connector(C45)Engine Compartment>Engine Wire>No. 1 Ignition Coil Assembly

Click Connector(C46)Engine Compartment>Engine Wire>No. 2 Ignition Coil Assembly

Click Connector(C47)Engine Compartment>Engine Wire>No. 3 Ignition Coil Assembly

Click Connector(C48)Engine Compartment>Engine Wire>No. 4 Ignition Coil Assembly

3 (IGP relay) - C45-1 (+B) Always Below 1 Ω
3 (IGP relay) - C46-1 (+B) Always Below 1 Ω
3 (IGP relay) - C47-1 (+B) Always Below 1 Ω
3 (IGP relay) - C48-1 (+B) Always Below 1 Ω
3 (IGP relay) or C45-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
3 (IGP relay) or C46-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
3 (IGP relay) or C47-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
3 (IGP relay) or C48-1 (+B) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

CHECK ECM POWER SOURCE CIRCUIT

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>ECM Power Source Circuit


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR