Cooling Fan System (For Sedan) Cooling Fan Circuit

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Cooling. Yaris. Ncp93, 131

TECHNICAL DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK INTEGRATION RELAY

CHECK ENGINE ROOM RELAY BLOCK

INSPECT INTEGRATION RELAY

INSPECT FAN NO. 2 RELAY

INSPECT COOLING FAN RESISTOR

CHECK WIRE HARNESS AND CONNECTOR (FAN NO. 2 RELAY - BODY GROUND)

CHECK WIRE HARNESS AND CONNECTOR (COOLING FAN RESISTOR - BODY GROUND)

CHECK WIRE HARNESS AND CONNECTOR (FAN NO. 2 RELAY - COOLING FAN RESISTOR)

CHECK COOLING FAN MOTOR

CHECK WIRE HARNESS AND CONNECTOR (COOLING FAN MOTOR - INTEGRATION RELAY)

CHECK WIRE HARNESS AND CONNECTOR (COOLING FAN MOTOR - FAN NO. 2 RELAY)

CHECK WIRE HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - ECM)

COOLING FAN SYSTEM (for Sedan) - Cooling Fan Circuit


TECHNICAL DESCRIPTION

To control the cooling fans, the ECM turns on or off the cooling fan relays based on the engine coolant temperature, air conditioning switch, refrigerant pressure, engine speed and vehicle speed signals.
The ECM turns on or off the fan relays to switch the cooling fan motor circuit between the series circuit and parallel circuit, controlling the cooling fan motor speed in 2 steps.

WIRING DIAGRAM

Refer to System Diagram (YARIS_NCP93 RM000001E6N00BX.html).

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK INTEGRATION RELAY


    Yaris. Ncp93, 131.1Nz-Fe Cooling.Cooling System (For Sedan).Cooling Fan System (For Sedan) Cooling Fan Circuit

  1. Remove the INTEGRATION RELAY from the engine room relay block.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    INTEGRATION RELAY Connector 1B-5 - Body ground
    		Always
    		11 to 14V
    Text in Illustration
    *1
    		Engine Room Relay Block
    *2
    		INTEGRATION RELAY

  1. Reinstall the INTEGRATION RELAY.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


2.CHECK ENGINE ROOM RELAY BLOCK


    Yaris. Ncp93, 131.1Nz-Fe Cooling.Cooling System (For Sedan).Cooling Fan System (For Sedan) Cooling Fan Circuit

  1. Remove the INTEGRATION RELAY and FAN No. 2 relay from the engine room relay block.

  1. Turn the Ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    INTEGRATION RELAY Connector 1B-6 - Body ground
    		Ignition switch ON
    		11 to 14V
    FAN No. 2 relay terminal 2 - Body ground
    		Ignition switch ON
    		11 to 14V
    Text in Illustration
    *1
    		Engine Room Relay Block
    *2
    		INTEGRATION RELAY
    *3
    		FAN No. 2Relay

  1. Reinstall the INTEGRATION RELAY and FAN No. 2 relay.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.INSPECT INTEGRATION RELAY

  1. Inspect the INTEGRATION RELAY (YARIS_NCP93 RM000001CMR032X.html).



NG
REPLACE INTEGRATION RELAY
OK


4.INSPECT FAN NO. 2 RELAY

  1. Inspect the FAN No. 2 relay (YARIS_NCP93 RM0000017WF02JX.html).



NG
REPLACE FAN NO.2 RELAY
OK


5.INSPECT COOLING FAN RESISTOR

  1. Inspect the cooling fan resistor (YARIS_NCP93 RM000003FVD00XX.html).



NG
REPLACE COOLING FAN RESISTOR
OK


6.CHECK WIRE HARNESS AND CONNECTOR (FAN NO. 2 RELAY - BODY GROUND)

  1. Remove the FAN No. 2 relay from the engine room main relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    FAN No. 2 relay terminal 5 - Body ground
    		Always
    		Below 1 Ω

  1. Reinstall the FAN No. 2 relay.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


7.CHECK WIRE HARNESS AND CONNECTOR (COOLING FAN RESISTOR - BODY GROUND)

  1. Disconnect the cooling fan resistor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A14-1 (-) - Body ground
    		Always
    		Below 1 Ω

  1. Connect the cooling fan resistor connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


8.CHECK WIRE HARNESS AND CONNECTOR (FAN NO. 2 RELAY - COOLING FAN RESISTOR)

  1. Disconnect the cooling fan resistor connector.

  1. Remove the FAN No. 2 relay from the engine room relay block.

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

Standard Resistance (Check for Open):
Tester Connection
Condition
Specified Condition
FAN No. 2 relay terminal 4 - A14-2 (+)
Always
Below 1 Ω
Standard Resistance (Check for Short):
Tester Connection
Condition
Specified Condition
A14-2 (+) or FAN No. 2 relay terminal 4 - Body ground
Always
10 kΩ or higher

  1. Reinstall the FAN No. 2 relay.

  1. Reconnect the cooling fan resistor connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


9.CHECK COOLING FAN MOTOR

  1. Inspect the cooling fan motor (YARIS_NCP93 RM000001E4S01RX.html).



NG
REPLACE COOLING FAN MOTOR (YARIS_NCP93 RM000001E4V01CX.html)
OK


10.CHECK WIRE HARNESS AND CONNECTOR (COOLING FAN MOTOR - INTEGRATION RELAY)

  1. Disconnect the cooling fan motor connector.

  1. Remove the INTEGRATION RELAY from the engine room relay block.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A8-2 - INTEGRATION RELAY Connector 1B-8
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A8-2 - INTEGRATION RELAY Connector 1B-8
    		Always
    		10 kΩ or higher

  1. Reinstall the INTEGRATION RELAY.

  1. Reconnect the cooling fan motor connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


11.CHECK WIRE HARNESS AND CONNECTOR (COOLING FAN MOTOR - FAN NO. 2 RELAY)

  1. Disconnect the cooling fan motor connector.

  1. Remove the FAN No. 2 relay from the engine room relay block.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A8-1 - FAN No. 2 relay terminal 3
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A8-1 or FAN No. 2 relay terminal 3 - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the FAN No. 2 relay.

  1. Reconnect the cooling fan motor connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


12.CHECK WIRE HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - ECM)

  1. Remove the INTEGRATION RELAY and FAN No. 2 relay from the engine room relay block.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A21-22 (FAN2) - FAN No. 2 relay terminal 1
    		Always
    		Below 1 Ω
    A21-21 (FAN) - INTEGRATION RELAY Connector 1B-8
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A21-22 (FAN2) or FAN No. 2 relay terminal 1 - Body ground
    		Always
    		10 kΩ or higher
    A21-21 (FAN) or INTEGRATION RELAY Connector 1B-8 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reinstall the INTEGRATION RELAY and FAN No. 2 relay.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)