Cooling Fan Circuit [09/2022 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Electric Cooling Fan.
5. Check the operation of the cooling fan while operating it using the Techstream.

   Powertrain > Engine and ECT > Active Test 

   Tester Display
   Control the Electric Cooling Fan

   OK

   Tester Operation	Fan Operation
   ON	Cooling fan operates
   OFF	Cooling fan stops

   Result

   Result	Proceed to
   OK	A
   Cooling fan does not operate	B
   Cooling fan does not stop	C

Result: 

A 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2022 - ]  

Result: 

C 

See step  10

Result: 

B 

See step  2

1. Inspect the cooling fan motor.

   Refer to ON-VEHICLE INSPECTION [09/2022 - ]

   Result

   Result
   OK
   NG

Result: 

NG 

REPLACE COOLING FAN MOTOR. Refer to  REMOVAL [09/2022 - ] 

Result: 

OK 

See step  3

1. Disconnect the A101 cooling fan ECU connector.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A101-1(+B1) - A101-3 (E1)	Ignition switch ON	11 to 14 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Cooling fan ECU)

   Result

   Result
   OK
   NG

Result: 

NG 

See step  5

Result: 

OK 

See step  4

1. Disconnect the A47 ECM connector.
2. Disconnect the A101 cooling fan ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   A47-32 (RFC) or A101-2 (SI) - Body ground	Always	10 kΩ or higher

   Result

   Result
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2022 - ]  

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - COOLING FAN ECU) 

1. Disconnect the A101 cooling fan ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   A101-3 (E1) - Body ground	Always	Below 1 Ω

   Result

   Result
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  6

1. Inspect the FAN NO. 1 relay.

   Refer to ON-VEHICLE INSPECTION [09/2022 - ]

   Result

   Result
   OK
   NG

Result: 

NG 

REPLACE FAN NO. 1 RELAY 

Result: 

OK 

See step  7

1. Remove the FAN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   3 (FAN NO. 1 relay) - Body ground	Always	11 to 14 V

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 1 RELAY - BATTERY) 

Result: 

OK 

See step  8

1. Disconnect the A101 cooling fan ECU connector.
2. Remove the FAN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   A101-1(+B1) - 5 (FAN NO. 1 relay)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   A101-1 (+B) or 5 (FAN NO. 1 relay) - Body ground	Always	10 kΩ or higher

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN ECU - FAN NO. 1 RELAY) 

Result: 

OK 

See step  9

1. Remove the FAN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2 (FAN NO. 1 relay) - Body ground	Always	Below 1 Ω

   Result

   Result
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 1 RELAY POWER SOURCE CIRCUIT) 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 1 RELAY - BODY GROUND) 

1. Disconnect the A47 ECM connector.
2. Disconnect the A101 cooling fan ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   A47-32 (RFC) - A101-2 (SI)	Always	Below 1 Ω

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - COOLING FAN ECU) 

Result: 

OK 

See step  11

1. Disconnect the z21 cooling fan motor connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   z21-1(-) - Body ground	Always	10 kΩ or higher

   Result

   Result
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2022 - ]  

Result: 

NG 

REPLACE COOLING FAN MOTOR. Refer to  REMOVAL [09/2022 - ]