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K3-VE COOLING COOLING FAN SYSTEM Cooling Fan Circuit

TECHNICAL DESCRIPTION

To control the cooling fan, the ECM turns on or off the cooling fan relay based on the engine coolanttemperature, air conditioning switch, refrigerant pressure, engine speed and vehicle speed signals.

WIRING DIAGRAM

Refer to System Diagram (See page Engine / Hybrid System>K3-VE COOLING>COOLING FANSYSTEM>SYSTEM DIAGRAM).

CAUTION / NOTICE / HINT

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

PROCEDURE

1.CHECK WIRE HARNESS AND CONNECTOR (RAD RELAY VOLTAGE)

Remove the RAD relay from the engine room relay block.

a.

*1 Engine Room Relay Block

*2 RAD Relay

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

Standard Voltage:

b.

TesterConnection

ConditionSpecifiedCondition

RAD relay

*1

*2

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REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

2.CHECK WIRE HARNESS AND CONNECTOR (AM2 VOLTAGE)

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

3.INSPECT RAD RELAY

NG

2.CHECK WIRE HARNESS AND CONNECTOR (AM2 VOLTAGE)

3.INSPECT RAD RELAY

terminal 3 - Bodyground

Always 11 to 14V

Reinstall the RAD relay.

Result:

c.

Proceed to

OK

NG

Disconnect the ignition or starter switch assembly connector.a.

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

Standard Voltage:

b.

TesterConnection

ConditionSpecifiedCondition

E28-5 (AM2) -Body ground

Always 11 to 14V

Reconnect the ignition or starter switch assembly connector.

Result:

c.

Proceed to

OK

NG

Inspect the RAD relay.Click hereEngine / Hybrid System>K3-VE COOLING>RELAY>ON-VEHICLE INSPECTION

a.

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REPLACE RAD RELAY

OK

4.INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

NG

REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

Click hereEngine / Hybrid System>K3-VE STARTING>IGNITION SWITCH>INSPECTION

OK

5.CHECK WIRE HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCHASSEMBLY - RAD RELAY)

NG

4.INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

5.CHECK WIRE HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - RADRELAY)

Result:

Proceed to

OK

NG

Inspect the ignition or starter switch assembly.Click hereEngine / Hybrid System>K3-VE STARTING>IGNITION SWITCH>INSPECTION

Result:

a.

Proceed to

OK

NG

Disconnect the ignition or starter switch assembly connector.a.

Remove the RAD relay from the engine room relay block.b.

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

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

c.

TesterConnection

ConditionSpecifiedCondition

E28-6 (IG2) -RAD relayterminal 2

Always Below 1 Ω

TesterConnection

ConditionSpecifiedCondition

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REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

6.CHECK WIRE HARNESS AND CONNECTOR (COOLING FAN MOTOR - BODYGROUND)

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

7.INSPECT COOLING FAN MOTOR

NG

6.CHECK WIRE HARNESS AND CONNECTOR (COOLING FAN MOTOR - BODY GROUND)

E28-6 (IG2) orRAD relay

terminal 2 - Bodyground

Always10 kΩ orhigher

Reinstall the RAD relay.d.

Reconnect the ignition or starter switch assembly connector.

Result:

e.

Proceed to

OK

NG

Disconnect the cooling fan motor connector.a.

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

Standard Resistance:

b.

TesterConnection

ConditionSpecifiedCondition

A6-1 - Bodyground

Always Below 1 Ω

Reconnect the cooling fan motor connector.

Result:

c.

Proceed to

OK

NG

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REPLACE COOLING FAN MOTOR

Click hereEngine / Hybrid System>K3-VE COOLING>COOLING FAN MOTOR>REMOVAL

OK

8.CHECK WIRE HARNESS AND CONNECTOR (COOLING FAN MOTOR - RAD RELAY)

NG

OK

9.CHECK WIRE HARNESS AND CONNECTOR (RAD RELAY - ECM)

7.INSPECT COOLING FAN MOTOR

8.CHECK WIRE HARNESS AND CONNECTOR (COOLING FAN MOTOR - RAD RELAY)

Inspect the cooling fan motorClick hereEngine / Hybrid System>K3-VE COOLING>COOLING FAN MOTOR>ON-VEHICLE INSPECTION

Result:

a.

Proceed to

OK

NG

Disconnect the cooling fan motor connector.a.

Remove the RAD relay from the engine room relay block.b.

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

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

c.

TesterConnection

ConditionSpecifiedCondition

A6-2 - RAD relayterminal 5

Always Below 1 Ω

TesterConnection

ConditionSpecifiedCondition

A6-2 or RADrelay terminal 5 -

Body groundAlways

10 kΩ orhigher

Reinstall the RAD relay.d.

Reconnect the cooling fan motor connector.

Result:

e.

Proceed to

OK

NG

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© 2012 TOYOTA MOTOR CORPORATION. All Rights Reserved.

REPAIR OR REPLACE HARNESS AND CONNECTOR

NG

REPLACE ECM

Click hereEngine / Hybrid System>K3-VE ENGINE CONTROL>ECM(for LHD)>REMOVAL

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

NG

9.CHECK WIRE HARNESS AND CONNECTOR (RAD RELAY - ECM)

Remove the RAD relay from the engine room relay block.a.

Disconnect the ECM connector.b.

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

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

c.

TesterConnection

ConditionSpecifiedCondition

E3-16 (FAN) -RAD relayterminal 1

Always Below 1 Ω

TesterConnection

ConditionSpecifiedCondition

E3-16 (FAN) orRAD relay

terminal 1 - Bodyground

Always10 kΩ orhigher

Reconnect the ECM connector.d.

Reinstall the RAD relay.

Result:

e.

Proceed to

OK

NG