RM3660EC _51 Engine / Hybrid System _080776 NR Series COOLING _0392636 COOLING FAN SYSTEM J

NR Series COOLING  COOLING FAN SYSTEM  Cooling Fan Circuit  


DESCRIPTION

The ECM calculates an appropriate cooling fan speed based on the engine coolant temperature, air conditioning switch condition, refrigerant pressure, engine speed and vehicle speed, and sends the signals to the cooling fan ECU to regulate the cooling fans. The cooling fan ECU controls the cooling fan speed based on the duty ratio signal sent from the ECM. By basing its control on the operating conditions, the ECM can control the fan speed optimally using the cooling fan ECU, achieving both high cooling performance and quietness.

WIRING DIAGRAM

A397750E10
0.448,7.698 1.521,7.896 1.073,0.198 10 false Battery 0.406,7.26 1.479,7.458 1.073,0.198 10 false BATT MAIN 1.323,7.271 2.563,7.521 1.24,0.25 10 false EFI-MAIN NO. 1 0.385,5.438 1.458,5.635 1.073,0.198 10 false ALT 1.26,3.667 2.333,3.865 1.073,0.198 10 false FAN NO. 1 1.281,0.74 2.354,0.938 1.073,0.198 10 false FAN NO. 2 2.604,8.333 2.938,8.521 0.333,0.188 10 false 1B 2.99,7.854 4.625,8.115 1.635,0.26 10 false EFI-MAIN 5.188,6.25 6.823,6.51 1.635,0.26 10 false RFC 2.458,7.406 2.792,7.594 0.333,0.188 10 false 5 5,4.229 5.333,4.417 0.333,0.188 10 false 4 2.469,6.99 2.802,7.177 0.333,0.188 10 false 3 5.177,7.521 6.813,7.781 1.635,0.26 10 false MREL 4.958,7.458 6.594,7.719 1.635,0.26 10 false 46 5.385,7.969 7.021,8.229 1.635,0.26 10 false A46 5.365,8.115 7,8.375 1.635,0.26 10 false ECM 4.927,6.167 6.563,6.427 1.635,0.26 10 false 60 5.219,3.479 5.594,3.76 0.375,0.281 10 false +B2 5.219,1.5 5.594,1.781 0.375,0.281 10 false IGS 5.198,2.281 5.573,2.563 0.375,0.281 10 false SI 5,0.479 5.333,0.667 0.333,0.188 10 false 1 5,1.396 5.333,1.583 0.333,0.188 10 false 4 5,2.146 5.333,2.917 0.333,0.771 10 false 3 6.083,2.156 6.5,2.406 0.417,0.25 10 false 2 2.875,5.396 3.542,5.813 0.667,0.417 10 false EFI NO. 3 5.188,4.354 5.563,4.635 0.375,0.281 10 false IGS2 5.198,5.146 5.573,5.427 0.375,0.281 10 false SI2 5.76,5.115 6.125,5.406 0.365,0.292 10 false E2 5.677,2.26 6.052,2.542 0.375,0.281 10 false GND 4.99,5.042 5.323,5.813 0.333,0.771 10 false 3 4.99,3.323 5.323,3.51 0.333,0.188 10 false 1 6.063,5.031 6.479,5.281 0.417,0.25 10 false 2 5.208,0.583 5.583,0.865 0.375,0.281 10 false +B 4.042,7.021 4.375,7.208 0.333,0.188 10 false 4 4.042,7.417 4.375,7.604 0.333,0.188 10 false 6 2.625,8.479 4.26,8.74 1.635,0.26 10 false No. 1 Integration Relay 5.063,2.531 5.438,2.813 0.375,0.281 10 false c1 5.052,2.688 6.542,3.135 1.49,0.448 10 false Cooling Fan Motor RH 4.969,5.563 6.458,6.01 1.49,0.448 10 false Cooling Fan Motor LH 4.979,5.406 5.354,5.688 0.375,0.281 10 false A63

CAUTION / NOTICE / HINT

NOTICE:
·

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

·

Before replacing the ECM, refer to Service Bulletin.



PROCEDURE

1.PERFORM ACTIVE TEST USING GTS (CONTROL THE ENGINE COOLING FAN DUTY RATIO)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Engine / Active Test / Control the Engine Cooling Fan Duty Ratio.

Powertrain > Engine > Active Test
Tester Display
Control the Engine Cooling Fan Duty Ratio
50004 372 11

e.

Check the operation of the cooling fans while operating them using the GTS.

OK:
Tester Operation Fan Operation
30 - 100% Cooling fans operate
0% Cooling fans stop



Result:
Result Proceed to
OK A
NG (Cooling fan LH does not operate) B
NG (Cooling fan RH does not operate) C
NG (Cooling fan LH does not stop) D
NG (Cooling fan RH does not stop) E



A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereEngine / Hybrid System>NR Series (COOLING)>COOLING FAN SYSTEM>PROBLEM SYMPTOMS TABLE


B

2.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR LH POWER SOURCE CIRCUIT)

C

6.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH POWER SOURCE CIRCUIT)

D

10.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR LH - ECM)

E

11.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH - ECM)
2.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR LH POWER SOURCE CIRCUIT)
a.

Disconnect the A63 cooling fan motor LH connector.


b.
A390798C57
1.552,0.198 1.885,0.427 0.333,0.229 0.792,1.979 1.042,1.979 1.042,1.979 1.281,1.438 true 2.646,1.979 2.365,1.979 2.365,1.979 2.198,1.438 true 0.104,0.052 0.417,0.25 0.313,0.198 10 false *a 1.594,0.229 1.927,0.417 0.333,0.188 10 false A63 0.5,1.906 0.958,2.104 0.458,0.198 10 false +B2 2.708,1.885 3.167,2.083 0.458,0.198 10 false E2
*a Front view of wire harness connector
(to Cooling Fan Motor LH)


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

Standard Voltage:
Tester Connection Condition Specified Condition
A63-1 (+B2) - A63-2 (E2) Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR LH - NO. 1 INTEGRATION RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR LH POWER SOURCE CIRCUIT)

3.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR LH - NO. 1 INTEGRATION RELAY)
a.

Disconnect the A63 cooling fan motor LH connector.


b.

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


c.

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

Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition
A63-4 (IGS2) - 1B-4 Always Below 1 Ω


Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition
A63-4 (IGS2) or 1B-4 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR LH - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR LH - NO. 1 INTEGRATION RELAY)

4.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR LH - BODY GROUND)
a.

Disconnect the A63 cooling fan motor LH connector.


b.

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

Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition
A63-2 (E2) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR LH - ECM)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR LH - BODY GROUND)

5.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR LH - ECM)
a.

Disconnect the A46 ECM connector.


b.

Disconnect the A63 cooling fan motor LH connector.


c.

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

Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition
A63-3 (SI2) - A46-60 (RFC) Always Below 1 Ω


Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition
A63-3 (SI2) or A46-60 (RFC) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE COOLING FAN MOTOR LH

Click hereEngine / Hybrid System>NR Series (COOLING)>COOLING FAN MOTOR>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR LH - ECM)

6.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH POWER SOURCE CIRCUIT)
a.

Disconnect the c1 cooling fan motor RH connector.


b.
A390798C58
1.552,0.198 1.885,0.427 0.333,0.229 0.792,1.979 1.042,1.979 1.042,1.979 1.281,1.438 true 2.646,1.979 2.365,1.979 2.365,1.979 2.198,1.438 true 0.104,0.052 0.417,0.25 0.313,0.198 10 false *a 1.646,0.229 1.979,0.417 0.333,0.188 10 false c1 0.521,1.906 0.979,2.104 0.458,0.198 10 false +B 2.708,1.885 3.167,2.083 0.458,0.198 10 false GND
*a Front view of wire harness connector
(to Cooling Fan Motor RH)


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

Standard Voltage:
Tester Connection Condition Specified Condition
c1-1 (+B) - c1-2 (GND) Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH - NO. 1 INTEGRATION RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR RH POWER SOURCE CIRCUIT)

7.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH - NO. 1 INTEGRATION RELAY)
a.

Disconnect the c1 cooling fan motor RH connector.


b.

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


c.

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

Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition
c1-4 (IGS) - 1B-4 Always Below 1 Ω


Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition
c1-4 (IGS) or 1B-4 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

8.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR RH - NO. 1 INTEGRATION RELAY)

8.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH - BODY GROUND)
a.

Disconnect the c1 cooling fan motor RH connector.


b.

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

Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition
c1-2 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

9.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH - ECM)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR RH - BODY GROUND)

9.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH - ECM)
a.

Disconnect the A46 ECM connector.


b.

Disconnect the c1 cooling fan motor RH connector.


c.

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

Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition
c1-3 (SI) - A46-60 (RFC) Always Below 1 Ω


Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition
c1-3 (SI) or A46-60 (RFC) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE COOLING FAN MOTOR RH

Click hereEngine / Hybrid System>NR Series (COOLING)>COOLING FAN MOTOR>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR RH - ECM)

10.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR LH - ECM)
a.

Disconnect the A46 ECM connector.


b.

Disconnect the A63 cooling fan motor LH connector.


c.

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

Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition
A46-60 (RFC) - A63-3(SI2) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE COOLING FAN MOTOR LH

Click hereEngine / Hybrid System>NR Series (COOLING)>COOLING FAN MOTOR>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR LH - ECM)

11.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH - ECM)
a.

Disconnect the A46 ECM connector.


b.

Disconnect the c1 cooling fan motor RH connector.


c.

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

Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition
A46-60 (RFC) - c1-3 (SI) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE COOLING FAN MOTOR RH

Click hereEngine / Hybrid System>NR Series (COOLING)>COOLING FAN MOTOR>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR RH - ECM)