RM36D0EC _51 Engine / Hybrid System _083058 M20D-FKS ENGINE CONTROL _0401834 SFI SYSTEM J

M20D-FKS ENGINE CONTROL  SFI SYSTEM  ECM Power Source Circuit  


DESCRIPTION

When the ignition switch turned to ON, the battery voltage is applied to IGP 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

A435153E11
1.552,6.542 3.344,7.063 1.792,0.521 10 false Certification ECU (Smart Key ECU Assembly)*1 1.563,6.396 3.365,6.635 1.802,0.24 10 false A126 2.24,5.896 4.042,6.135 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 1.646,3.115 3.448,3.354 1.802,0.24 10 false IGP 4.625,0.906 5.427,1.146 0.802,0.24 10 false EFI NO. 2 4.615,3.104 5.646,3.344 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 3.917,3.792 4.625,4.115 0.708,0.323 10 false IGP 2.24,5.073 4.031,5.594 1.792,0.521 10 false Ignition Switch Assembly*2 2.25,4.906 4.042,5.427 1.792,0.521 10 false G28 0.646,5.99 2.438,6.51 1.792,0.521 10 false Battery 1.531,4.698 3.323,5.219 1.792,0.521 10 false AM2 1.927,4.438 2.115,4.813 0.188,0.375 10 false *2 2.146,4.438 3.938,4.958 1.792,0.521 10 false 7 2.323,4.448 4.115,4.969 1.792,0.521 10 false AM1 3.094,4.448 4.885,4.969 1.792,0.521 10 false IG1 3.427,4.438 5.219,4.958 1.792,0.521 10 false 8 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 5.583,4.979 5.885,5.406 0.302,0.427 10 false 22 5.604,2.844 5.906,3.271 0.302,0.427 10 false 30 5.604,1.656 5.906,2.083 0.302,0.427 10 false 26 5.615,1.156 5.917,1.583 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 4.344,4.427 6.135,4.948 1.792,0.521 10 false *2 4.792,5.219 6.583,5.74 1.792,0.521 10 false *1 6.021,5.99 6.448,6.417 0.427,0.427 10 false A116 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 3.563,6.885 6.292,7.198 2.729,0.313 10 false *1: w/ Smart Entry and Start System 3.583,7.208 6.354,7.5 2.771,0.292 10 false *2: w/o Smart Entry and Start System 6.563,1.75 6.865,2.177 0.302,0.427 10 false IC 0.74,4.708 1.323,5.406 0.583,0.698 10 false INP STD NO. 1-3

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
A116-22 (E1) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

2.CHECK TERMINAL VOLTAGE (IGP TERMINAL VOLTAGE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK TERMINAL VOLTAGE (IGP TERMINAL VOLTAGE)
A534801C28
1.594,0.323 1.979,0.552 0.385,0.229 0.49,2.958 1.104,1.563 true 0.104,0.083 0.417,0.281 0.313,0.198 10 false *a 0.344,2.99 1.021,3.292 0.677,0.302 10 false IGP 1.635,0.365 2.135,0.604 0.5,0.24 10 false A116
*a Front view of wire harness connector
(to ECM)


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
A116-30 (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 RELAY
3.INSPECT EFI-MAIN NO. 1 RELAY
a.

Inspect the EFI-MAIN NO. 1 relay.

Click hereEngine / Hybrid System>M20D-FKS (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 and junction block assembly.


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 and 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.



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
2 (EFI-MAIN NO. 1 relay) - A116-26 (MREL) Always Below 1 Ω
5 (EFI-MAIN NO. 1 relay) - A116-21 (+B) Always Below 1 Ω
5 (EFI-MAIN NO. 1 relay) - A116-51 (+B2) Always Below 1 Ω
2 (EFI-MAIN NO. 1 relay) or A116-26 (MREL) - Body ground and other terminals Always 10 kΩ or higher
5 (EFI-MAIN NO. 1 relay), A116-21 (+B) or A116-51 (+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.
A566374C01
0.073,0.042 0.385,0.198 0.313,0.156 10 false *1 2.229,0.552 2.542,0.708 0.313,0.156 10 false *2
*1 No. 1 Engine Room Relay Block and 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 junction block assembly.


b.

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



OK

REPLACE ECM

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


NG

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

6.INSPECT IGP RELAY
a.

Inspect the IGP relay.

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>RELAY>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

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

NG

REPLACE IGP RELAY

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

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


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 relay) - A116-30 (IGP) Always Below 1 Ω
3 (IGP relay) or A116-30 (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 RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGP RELAY)
A566362C01
0.146,0.083 0.458,0.281 0.313,0.198 10 false *1 2.083,1.229 2.396,1.427 0.313,0.198 10 false *2
*1 No. 1 Engine Room Relay Block and Junction Block Assembly
*2 IGP Relay


a.

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


b.

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



OK

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

NG

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

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

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


b.

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:
Result Proceed to
OK (w/ Smart Entry and Start System) A
OK (w/o Smart Entry and Start System) B
NG C



A

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 TROUBLESHOOTING


B

10.INSPECT IGNITION SWITCH ASSEMBLY

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.INSPECT IGNITION SWITCH ASSEMBLY
a.

Inspect the ignition switch assembly.

Click hereEngine / Hybrid System>M20D-FKS (STARTING)>IGNITION SWITCH>INSPECTION


Result:
Proceed to
OK
NG



OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

NG

REPLACE IGNITION SWITCH ASSEMBLY

Click hereEngine / Hybrid System>M20D-FKS (STARTING)>IGNITION SWITCH>REMOVAL