Cooling Fan System (For Hatchback) Cooling Fan Circuit

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

TECHNICAL DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FAN NO. 1 RELAY (POWER SOURCE)

CHECK ENGINE ROOM R/B

INSPECT FAN NO. 1 RELAY

INSPECT FAN NO. 2 RELAY

INSPECT COOLING FAN RESISTOR

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

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

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

CHECK COOLING FAN MOTOR

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

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

CHECK HARNESS AND CONNECTOR (ENGINE ROOM R/B - ECM)

COOLING FAN SYSTEM (for Hatchback) - 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 RM000001E4W00WX.html).

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK FAN NO. 1 RELAY (POWER SOURCE)


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

  1. Remove the FAN No. 1 relay from the engine room R/B.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    FAN No. 1 relay holder 3 - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *1
    		Engine Room R/B
    *2
    		FAN No. 1 Relay Holder

  1. Reinstall the FAN No. 1 relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK ENGINE ROOM R/B


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

  1. Remove the FAN No. 1 relay and FAN No. 2 relay from the engine room R/B.

  1. Turn the Ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    FAN No. 1 relay holder 1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    FAN No. 2 relay holder 2 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *1
    		Engine Room R/B
    *2
    		FAN No. 1 Relay Holder
    *3
    		FAN No. 2 Relay Holder

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT FAN NO. 1 RELAY

  1. Inspect the FAN No. 1 relay (YARIS_NCP93 RM0000017WF036X_01_0009.html).



NG
REPLACE FAN NO.1 RELAY
OK


4.INSPECT FAN NO. 2 RELAY

  1. Inspect the FAN No. 2 relay (YARIS_NCP93 RM0000017WF036X_01_0002.html).



NG
REPLACE FAN NO.2 RELAY
OK


5.INSPECT COOLING FAN RESISTOR

  1. Inspect the cooling fan resistor (YARIS_NCP93 RM000003FVD016X.html).



NG
REPLACE COOLING FAN RESISTOR
OK


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

  1. Remove the FAN No. 2 relay from the engine room R/B.

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

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

  1. Reinstall the FAN No. 2 relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK 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
    A59-1 (-) - Body ground
    		Always
    		Below 1 Ω

  1. Connect the cooling fan resistor connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK 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 R/B.

  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 holder 4 - A59-2 (+)
Always
Below 1 Ω
Standard Resistance (Check for Short):
Tester Connection
Condition
Specified Condition
A59-2 (+) or FAN No. 2 relay holder 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 OR CONNECTOR
OK


9.CHECK COOLING FAN MOTOR

  1. Inspect the cooling fan motor (YARIS_NCP93 RM000001E4S028X.html).



NG
REPLACE COOLING FAN MOTOR (YARIS_NCP93 RM000001E4V01PX.html)
OK


10.CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR - FAN NO. 1 RELAY)

  1. Disconnect the cooling fan motor connector.

  1. Remove the FAN No. 1 relay from the engine room R/B.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A58-2 - FAN No. 1 relay holder 5
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A58-2 or FAN No. 1 relay holder 5 - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the FAN No. 1 relay.

  1. Reconnect the cooling fan motor connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


11.CHECK 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 R/B.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A58-1 - FAN No. 2 relay holder 3
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A58-1 or FAN No. 2 relay holder 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 OR CONNECTOR
OK


12.CHECK HARNESS AND CONNECTOR (ENGINE ROOM R/B - ECM)

  1. Remove the FAN No. 1 relay and FAN No. 2 relay from the engine room R/B.

  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
    A72-8 (FANH) - FAN No. 2 relay holder 1
    		Always
    		Below 1 Ω
    A72-7 (FANL) - FAN No. 1 relay holder 2
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A72-8 (FANH) or FAN No. 2 relay holder 1 - Body ground
    		Always
    		10 kΩ or higher
    A72-7 (FANL) or FAN No. 1 relay holder 2 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002IX_01_0043.html)