RM3660EC _51 Engine / Hybrid System _080777 NR Series ENGINE CONTROL _0393969 SFI SYSTEM J

NR Series ENGINE CONTROL  SFI SYSTEM  ECM Power Source Circuit  


DESCRIPTION

When the ignition switch is turned to ON, battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes current to flow to the coil of the EFI-MAIN relay, closing the contact of the EFI-MAIN relay and supplying power to terminals +B and +B2 of the ECM.

WIRING DIAGRAM

A546476E01
0.615,5.844 1.688,6.042 1.073,0.198 10 false Battery 5.927,0.51 6.396,0.729 0.469,0.219 10 false IG1D 4.906,1.115 7.052,1.75 2.146,0.635 10 false Certification ECU (Smart Key ECU Assembly) 6.24,6.208 6.698,6.406 0.458,0.198 10 false ECM 5.938,2.406 6.479,2.583 0.542,0.177 10 false IGSW 5.906,3.427 6.469,3.646 0.563,0.219 10 false +B 5.917,3.833 6.5,4.042 0.583,0.208 10 false +B2 5.896,4.958 6.49,5.156 0.594,0.198 10 false MREL 5.906,5.635 6.365,5.875 0.458,0.24 10 false E1 4.906,0.969 5.26,1.156 0.354,0.188 10 false I1 0.74,2.635 1.417,2.865 0.677,0.229 10 false IG2-MAIN 0.552,3.979 1.625,4.198 1.073,0.219 10 false EFI-MAIN NO. 1 2.677,4.604 3.75,4.802 1.073,0.198 10 false EFI-MAIN 2.729,3.25 3.802,3.448 1.073,0.198 10 false IG2 NO. 1 4.542,2.677 5.635,2.969 1.094,0.292 10 false ECU-IG2 NO. 1 5.104,4.49 5.875,4.708 0.771,0.219 10 false EFI NO. 2 5.656,0.406 6.01,0.594 0.354,0.188 10 false 15 5.542,2.51 6.104,2.729 0.563,0.219 10 false A46 5.542,3.406 6.104,3.625 0.563,0.219 10 false A46 5.542,3.844 6.104,4.063 0.563,0.219 10 false A46 5.542,5.063 6.104,5.281 0.563,0.219 10 false A46 5.542,5.625 6.104,5.844 0.563,0.219 10 false C78 5.583,5.417 6.146,5.635 0.563,0.219 10 false 53 5.583,4.854 6.146,5.073 0.563,0.219 10 false 46 5.615,3.625 6.177,3.844 0.563,0.219 10 false 3 5.615,3.167 6.177,3.385 0.563,0.219 10 false 2 5.615,2.302 6.177,2.521 0.563,0.219 10 false 6 0.458,4.875 1.344,5.198 0.885,0.323 10 false BATT-MAIN 5.24,4.188 5.396,4.385 0.156,0.198 10 false 1 5.542,4.188 5.698,4.385 0.156,0.198 10 false 2 1.99,5 4.594,5.198 2.604,0.198 10 false No. 1 Integration Relay 1.833,2.5 2.146,2.698 0.313,0.198 10 false 1A 1.833,2.917 2.146,3.115 0.313,0.198 10 false 1A 3.771,1.823 4.083,2.021 0.313,0.198 10 false 1A 4.229,2.531 4.542,2.729 0.313,0.198 10 false 1A 1.823,3.844 2.135,4.042 0.313,0.198 10 false 1B 1.833,4.302 2.146,4.5 0.313,0.198 10 false 1B 3.51,4.74 3.823,4.938 0.313,0.198 10 false 1B 4.219,3.844 4.531,4.042 0.313,0.198 10 false 1B 1.875,2.719 2.031,2.917 0.156,0.198 10 false 8 3.542,1.823 3.698,2.021 0.156,0.198 10 false 7 1.823,2.292 2.135,2.49 0.313,0.198 10 false 10 4.26,2.313 4.417,2.51 0.156,0.198 10 false 9 1.865,4.094 2.021,4.292 0.156,0.198 10 false 5 1.854,3.625 2.01,3.823 0.156,0.198 10 false 3 4.281,3.635 4.438,3.833 0.156,0.198 10 false 4 3.823,4.729 3.979,4.927 0.156,0.198 10 false 6

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 1 INTEGRATION RELAY)
a.

Disconnect the No. 1 integration relay connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
1A-10 - Body ground Always 11 to 14 V
1B-3 - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)

NG

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

2.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)
a.

Disconnect the No. 1 integration relay connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1A-8 - Body ground Always Below 1 Ω
1B-5 - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

3.INSPECT NO. 1 INTEGRATION RELAY (EFI-MAIN RELAY, IG2 NO. 1 RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.INSPECT NO. 1 INTEGRATION RELAY (EFI-MAIN RELAY, IG2 NO. 1 RELAY)
a.

Inspect the No. 1 integration relay (EFI-MAIN relay, IG2 NO. 1 relay).

Click herePower Source / Network>POWER DISTRIBUTION>INTEGRATION RELAY>INSPECTION


Result:
Proceed to
OK
NG



OK

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

NG

REPLACE NO. 1 INTEGRATION RELAY

Click herePower Source / Network>POWER DISTRIBUTION>INTEGRATION RELAY>REMOVAL


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

Disconnect the No. 1 integration relay connector.


b.

Disconnect the ECM connector.


c.

Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

HINT:

Remove the EFI-MAIN NO. 2 relay connected between the checked terminals as the coil inside the relay influences the measurement value.



d.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1A-9 - A46-6 (IGSW) Always Below 1 Ω
1B-6 - A46-46 (MREL) Always Below 1 Ω
1B-4 - A46-2 (+B) Always Below 1 Ω
1B-4 - A46-3 (+B2) Always Below 1 Ω
1A-9 or A46-6 (IGSW) - Body ground and other terminals Always 10 kΩ or higher
1B-6 or A46-46 (MREL) - Body ground and other terminals Always 10 kΩ or higher
1B-4 or A46-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
1B-4 or A46-3 (+B2) - Body ground and other terminals Always 10 kΩ or higher



HINT:

If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.


Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.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
C78-53 (E1) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

6.INSPECT TERMINAL VOLTAGE (IGSW VOLTAGE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.INSPECT TERMINAL VOLTAGE (IGSW VOLTAGE)
A371640C21
1.583,0.76 1.958,0.979 0.375,0.219 1.5,2.677 1.802,1.552 true 0.292,0.354 0.604,0.552 0.313,0.198 10 false *a 1.281,2.688 1.896,2.885 0.615,0.198 10 false IGSW 1.656,0.771 2.271,0.969 0.615,0.198 10 false A46
*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 Switch Condition Specified Condition
A46-6 (IGSW) - Body ground Ignition switch ON 11 to 14 V


Result:
Proceed to
OK
NG




OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>PROBLEM SYMPTOMS TABLE


NG

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

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


b.

Disconnect the No. 1 integration relay connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I1-15 (IG1D) - 1A-7 Always Below 1 Ω
I1-15 (IG1D) or 1A-7 - Body ground and other terminals Always 10 kΩ or higher



HINT:

If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.


Result:
Proceed to
OK
NG



OK

CHECK SMART ENTRY AND START SYSTEM (FOR START FUNCTION)

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR