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

M20C-FKS, M20D-FKS ENGINE CONTROL SFI SYSTEM ECM Power Source Circuit

DESCRIPTION

When the ignition switch turned to ON, the battery voltage is applied to IGSW of the ECM. When the transistor in the MREL circuit operates, current flows from the battery to ground through the drive circuit of the EFI-MAIN NO. 1 relay, thus operating the relay which supplies power to the +B and +B2 terminals of the ECM.

WIRING DIAGRAM

1.552,6.542 3.344,7.063 1.792,0.521 10 false Certification ECU (Smart Key ECU Assembly) 1.542,6.375 3.344,6.615 1.802,0.24 10 false A15 2.229,5.896 4.031,6.135 1.802,0.24 10 false IGPD 0.885,1.417 2.688,1.656 1.802,0.24 10 false EFI-MAIN NO. 1 1.625,3.104 3.427,3.344 1.802,0.24 10 false IGP 4.625,0.906 5.427,1.146 0.802,0.24 10 false EFI NO. 2 4.729,3.104 5.76,3.344 1.031,0.24 10 false ECU-IGP NO. 1 3.594,2.115 5.396,2.354 1.802,0.24 10 false EFI-MAIN NO. 1 3.896,3.792 4.927,4.031 1.031,0.24 10 false IGP 0.646,5.99 2.438,6.51 1.792,0.521 10 false Battery 2.677,5.885 4.469,6.406 1.792,0.521 10 false 24 3.604,2.854 3.906,3.281 0.302,0.427 10 false 5 3.615,3.354 3.917,3.781 0.302,0.427 10 false 2 4.385,2.854 4.688,3.281 0.302,0.427 10 false 3 4.375,3.354 4.677,3.781 0.302,0.427 10 false 1 3.615,1.156 3.917,1.583 0.302,0.427 10 false 3 3.604,1.646 3.906,2.073 0.302,0.427 10 false 1 4.375,1.156 4.677,1.583 0.302,0.427 10 false 5 4.385,1.667 4.688,2.094 0.302,0.427 10 false 2 5.604,4.979 5.906,5.406 0.302,0.427 10 false 22 5.635,2.844 5.938,3.271 0.302,0.427 10 false 30 5.604,1.656 5.906,2.083 0.302,0.427 10 false 26 5.625,1.156 5.927,1.583 0.302,0.427 10 false 51 5.615,0.656 5.917,1.083 0.302,0.427 10 false 21 5.885,0.771 6.188,1.198 0.302,0.427 10 false +B 5.885,1.271 6.188,1.698 0.302,0.427 10 false +B2 5.875,1.667 6.427,2.083 0.552,0.417 10 false MREL 5.896,2.844 6.448,3.26 0.552,0.417 10 false IGP 5.896,5.083 6.448,5.5 0.552,0.417 10 false E1 6.042,5.99 6.531,6.646 0.49,0.656 10 false A109 6.438,5.99 6.948,6.406 0.51,0.417 10 false ECM 5.094,0.646 5.396,1.073 0.302,0.427 10 false 1 4.708,0.646 5.01,1.073 0.302,0.427 10 false 2 6.563,1.75 6.865,2.177 0.302,0.427 10 false IC 0.51,5.063 1.583,5.26 1.073,0.198 10 false FL MAIN

CAUTION / NOTICE / HINT

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

PROCEDURE

1.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(A109)Location & Routingewd_type=routing;type=c;code=A109 Click Connector(A109)Engine Compartment>Engine Room Main Wire / Transmission Wire>ECMewd_type=component;type=c;code=A109;pinno=22
A109-22 (E1) - Body ground	Always	Below 1 Ω

Tester Connection

Condition

Specified Condition

Click Location & Routing(A109)Location & Routingewd_type=routing;type=c;code=A109

Click Connector(A109)Engine Compartment>Engine Room Main Wire / Transmission Wire>ECMewd_type=component;type=c;code=A109;pinno=22

A109-22 (E1) - Body ground

Always

Below 1 Ω

Result:

Proceed to
OK
NG

2.CHECK TERMINAL VOLTAGE (IGP TERMINAL VOLTAGE)

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK TERMINAL VOLTAGE (IGP TERMINAL VOLTAGE)

Disconnect the ECM connector.

Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Click Location & Routing(A109)Location & Routingewd_type=routing;type=c;code=A109 Click Connector(A109)Engine Compartment>Engine Room Main Wire / Transmission Wire>ECMewd_type=component;type=c;code=A109;pinno=30
A109-30 (IGP) - Body ground	Ignition switch ON	11 to 14 V

Tester Connection

Condition

Specified Condition

Click Location & Routing(A109)Location & Routingewd_type=routing;type=c;code=A109

Click Connector(A109)Engine Compartment>Engine Room Main Wire / Transmission Wire>ECMewd_type=component;type=c;code=A109;pinno=30

A109-30 (IGP) - Body ground

Ignition switch ON

11 to 14 V

Result:

Proceed to
OK
NG

3.INSPECT EFI-MAIN NO. 1 RELAY

6.INSPECT IGP RELAY

3.INSPECT EFI-MAIN NO. 1 RELAY

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>RELAY>ON-VEHICLE INSPECTION202111,999999,_51,_111785,_0503281,RM100000001ZE2G,

Result:

Proceed to
OK
NG

4.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - ECM)

REPLACE EFI-MAIN NO. 1 RELAY

4.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - ECM)

Remove the VVT relay, D INJ relay, EFI-MAIN NO. 2 relay and EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

HINT:: Remove the VVT relay, D INJ relay, EFI-MAIN NO. 2 relay and EFI-MAIN NO. 3 relay connected between the checked terminals as the coil inside the relay influences the measurement value.

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(A109)Location & Routingewd_type=routing;type=c;code=A109 Click Connector(A109)Engine Compartment>Engine Room Main Wire / Transmission Wire>ECMewd_type=component;type=c;code=A109;pinno=26,21,51
2 (EFI-MAIN NO. 1 relay) - A109-26 (MREL)	Always	Below 1 Ω
5 (EFI-MAIN NO. 1 relay) - A109-21 (+B)	Always	Below 1 Ω
5 (EFI-MAIN NO. 1 relay) - A109-51 (+B2)	Always	Below 1 Ω
2 (EFI-MAIN NO. 1 relay) or A109-26 (MREL) - Body ground and other terminals	Always	10 kΩ or higher
5 (EFI-MAIN NO. 1 relay), A109-21 (+B) or A109-51 (+B2) - Body ground and other terminals	Always	10 kΩ or higher

Result:

Proceed to
OK
NG

5.CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 1 RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 1 RELAY)

0.073,0.094 0.385,0.292 0.313,0.198 10 false *1 2.125,0.5 2.438,0.698 0.313,0.198 10 false *2

*1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
*2	EFI-MAIN NO. 1 Relay

Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
3 (EFI-MAIN NO. 1 relay) - Body ground	Always	11 to 14 V
1 (EFI-MAIN NO. 1 relay) - Body ground	Always	11 to 14 V

Result:

Proceed to
OK
NG

REPLACE ECM

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>ECM>REMOVAL202303,999999,_51,_111785,_0503271,RM1000000029P3U,

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 1 RELAY)

6.INSPECT IGP RELAY

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>RELAY>ON-VEHICLE INSPECTION202111,999999,_51,_111785,_0503281,RM100000001ZE2G,

Result:

Proceed to
OK
NG

7.CHECK HARNESS AND CONNECTOR (IGP RELAY - ECM)

REPLACE IGP RELAY

7.CHECK HARNESS AND CONNECTOR (IGP RELAY - ECM)

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

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(A109)Location & Routingewd_type=routing;type=c;code=A109 Click Connector(A109)Engine Compartment>Engine Room Main Wire / Transmission Wire>ECMewd_type=component;type=c;code=A109;pinno=30
3 (IGP relay) - A109-30 (IGP)	Always	Below 1 Ω
3 (IGP relay) or A109-30 (IGP) - Body ground and other terminals	Always	10 kΩ or higher

Tester Connection

Condition

Specified Condition

Click Location & Routing(A109)Location & Routingewd_type=routing;type=c;code=A109

Click Connector(A109)Engine Compartment>Engine Room Main Wire / Transmission Wire>ECMewd_type=component;type=c;code=A109;pinno=30

3 (IGP relay) - A109-30 (IGP)

Always

Below 1 Ω

3 (IGP relay) or A109-30 (IGP) - Body ground and other terminals

Always

10 kΩ or higher

Result:

Proceed to
OK
NG

8.CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGP RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGP RELAY)

0.073,0.094 0.385,0.292 0.313,0.198 10 false *1 2.125,1 2.438,1.198 0.313,0.198 10 false *2

*1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
*2	IGP Relay

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
5 (IGP relay) - Body ground	Always	11 to 14 V

Result:

Proceed to
OK
NG

9.CHECK HARNESS AND CONNECTOR (IGP RELAY - BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGP RELAY)

9.CHECK HARNESS AND CONNECTOR (IGP RELAY - BODY GROUND)

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (IGP relay) - Body ground	Always	Below 1 Ω

Result:

Proceed to
OK
NG

10.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IGP RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IGP RELAY)

Disconnect the certification ECU (smart key ECU assembly) connector.

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(A15)Location & Routingewd_type=routing;type=c;code=A15 Click Connector(A15)Instrument Panel>Engine Room Main Wire>Smart Key ECU Assemblyewd_type=component;type=c;code=A15;pinno=24
A15-24 (IGPD) - 1 (IGP relay)	Always	Below 1 Ω
A15-24 (IGPD) or 1 (IGP relay) - Body ground and other terminals	Always	10 kΩ or higher

Tester Connection

Condition

Specified Condition

Click Location & Routing(A15)Location & Routingewd_type=routing;type=c;code=A15

Click Connector(A15)Instrument Panel>Engine Room Main Wire>Smart Key ECU Assemblyewd_type=component;type=c;code=A15;pinno=24

A15-24 (IGPD) - 1 (IGP relay)

Always

Below 1 Ω

A15-24 (IGPD) or 1 (IGP relay) - Body ground and other terminals

Always

10 kΩ or higher

Result:

Proceed to
OK
NG

GO TO SMART ENTRY AND START SYSTEM

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, Gasoline Model)>HOW TO PROCEED WITH TROUBLESHOOTING202203,999999,_58,_111832,_0509385,RM1000000022G46,

REPAIR OR REPLACE HARNESS OR CONNECTOR