RM38T0EC _51 Engine / Hybrid System _144956 M20F-FXS, M20G-FXS ENGINE CONTROL _0604911 SFI SYSTEM J

M20F-FXS, M20G-FXS ENGINE CONTROL  SFI SYSTEM  ECM Power Source Circuit  


DESCRIPTION

When the ignition switch is to ON, the auxiliary battery voltage is applied to IGSW of the ECM. When the transistor in the MREL circuit operates, current flows from the auxiliary battery to ground through the drive circuit of the EFI-MAIN relay, thus operating the relay which supplies power to the +B and +B2 terminals of the ECM.

WIRING DIAGRAM

A404771E21
0.542,5.438 1.115,6.031 0.573,0.594 10 false Auxiliary Battery 0.375,4.708 1.292,4.906 0.917,0.198 10 false BATT MAIN 0.906,2.99 1.823,3.188 0.917,0.198 10 false IGP-MAIN 0.771,1.375 1.781,1.573 1.01,0.198 10 false EFI-MAIN NO.1 2.635,2.052 4.01,2.26 1.375,0.208 10 false EFI-MAIN NO.1 1.75,5.208 2.76,5.406 1.01,0.198 10 false I223 1.75,5.406 3.563,6.021 1.813,0.615 10 false Certification ECU (Smart Key ECU Assembly) 3.906,0.625 4.917,0.823 1.01,0.198 10 false EFI NO. 2 5.854,0.469 6.865,0.667 1.01,0.198 10 false +B 5.854,1.219 6.865,1.417 1.01,0.198 10 false +B2 5.844,1.604 6.854,1.802 1.01,0.198 10 false MREL 5.844,2.729 6.792,2.896 0.948,0.167 10 false IGP 5.854,5.219 6.802,5.385 0.948,0.167 10 false E1 5.635,0.385 6.635,0.552 1,0.167 10 false 9 5.583,1.135 6.583,1.302 1,0.167 10 false 35 5.573,1.635 6.573,1.802 1,0.167 10 false 15 5.625,2.74 6.625,2.906 1,0.167 10 false 2 5.563,5.135 6.563,5.302 1,0.167 10 false 10 6.25,6.219 6.844,6.396 0.594,0.177 10 false A47 6.25,6.406 6.625,6.656 0.375,0.25 10 false ECM 2.448,4.792 3.396,4.958 0.948,0.167 10 false IGPD 2.865,4.802 3.813,4.969 0.948,0.167 10 false 24 3.458,2.74 4.458,2.906 1,0.167 10 false 3 2.656,2.74 3.656,2.906 1,0.167 10 false 5 2.646,3.24 3.646,3.406 1,0.167 10 false 2 3.458,3.24 4.458,3.406 1,0.167 10 false 1 2.667,1.635 3.667,1.802 1,0.167 10 false 2 2.667,1.125 3.667,1.292 1,0.167 10 false 5 3.448,1.135 4.448,1.302 1,0.167 10 false 3 3.448,1.635 4.448,1.802 1,0.167 10 false 1 3.885,2.99 4.896,3.188 1.01,0.198 10 false ECU-IGP NO.1 4,0.333 5,0.5 1,0.167 10 false 2 4.333,0.333 5.333,0.5 1,0.167 10 false 1 6.542,1.708 6.844,1.99 0.302,0.281 10 false IC 2.813,3.677 3.729,3.875 0.917,0.198 10 false IGP-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)
a.

Disconnect the ECM connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A47-10 (E1) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

2.CHECK TERMINAL VOLTAGE (IGSW TERMINAL VOLTAGE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK TERMINAL VOLTAGE (IGSW TERMINAL VOLTAGE)
a.

Disconnect the ECM connector.


b.

Turn the ignition switch to ON.


c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A47-2 (IGP) - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

3.INSPECT EFI-MAIN NO. 1 RELAY

NG

6.INSPECT IGP-MAIN RELAY
3.INSPECT EFI-MAIN NO. 1 RELAY

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>RELAY>ON-VEHICLE INSPECTION

Result:
Proceed to
OK
NG



OK

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

NG

REPLACE EFI-MAIN NO. 1 RELAY

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

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


b.

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.

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.



c.

Disconnect the ECM connector.


d.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1 (EFI-MAIN NO. 1 relay) - A47-15 (MREL) Always Below 1 Ω
3 (EFI-MAIN NO. 1 relay) - A47-9 (+B) Always Below 1 Ω
3 (EFI-MAIN NO. 1 relay) - A47-35 (+B2) Always Below 1 Ω
1 (EFI-MAIN NO. 1 relay) or A47-15 (MREL) - Body ground and other terminals Always 10 kΩ or higher
3 (EFI-MAIN NO. 1 relay), A47-9 (+B) or A47-35 (+B2) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
5 (EFI-MAIN NO. 1 relay) - Body ground Always 11 to 14 V
2 (EFI-MAIN NO. 1 relay) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>ECM>REMOVAL


NG

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

6.INSPECT IGP-MAIN RELAY

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>RELAY>ON-VEHICLE INSPECTION

Result:
Proceed to
OK
NG



OK

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

NG

REPLACE IGP-MAIN RELAY

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

Remove the IGP-MAIN relay from the No. 1 engine room relay block.


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
3 (IGP-MAIN relay) - A47-2 (IGP) Always Below 1 Ω
3 (IGP-MAIN relay) or A47-2 (IGP) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Remove the IGP-MAIN relay from the No. 1 engine room relay block.


b.

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

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



Result:
Proceed to
OK
NG



OK

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

NG

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

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

Remove the IGP-MAIN relay from the No. 1 engine room relay block.


b.

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

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



Result:
Proceed to
OK
NG



OK

10.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IG2 NO. 1 RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IG2 NO. 1 RELAY)
a.

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


b.

Remove the IGP-MAIN relay from the No. 1 engine room relay block.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I223-24 (IGPD) - 1 (IGP-MAIN relay) Always Below 1 Ω
I223-24 (IGPD) or 1 (IGP-MAIN relay) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

GO TO SMART ENTRY AND START SYSTEM

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, HEV Model)>HOW TO PROCEED WITH TROUBLESHOOTING


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR