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 (Click here).

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)


    A247838E01

  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


    A247839E01

  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 (Click here).



NG
REPLACE FAN NO.1 RELAY
OK


4.INSPECT FAN NO. 2 RELAY

  1. Inspect the FAN No. 2 relay (Click here).



NG
REPLACE FAN NO.2 RELAY
OK


5.INSPECT COOLING FAN RESISTOR

  1. Inspect the cooling fan resistor (Click here).



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 (Click here).



NG
REPLACE COOLING FAN MOTOR (Click here)
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 (Click here)