Cooling Fan Circuit [01/2019 - 11/2022]: 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 / Active Test / Control the Engine Cooling Fan Duty Ratio.

   Powertrain > Engine > Active Test 

   Tester Display
   Control the Engine Cooling Fan Duty Ratio

5. Check the operation of the cooling fan while operating it using the Techstream.

   OK

   Tester Operation	Fan Operation
   30 - 100%	Cooling fan operates
   0%	Cooling fan stops

6. Turn the ignition switch to ON.

   Result

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

Result: 

A 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - 11/2022]  

Result: 

C 

See step  6

Result: 

B 

See step  2

1. Disconnect the A63 cooling fan motor connector.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Cooling Fan Motor)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A63-1 (+B1) - A63-2 (E1)	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR POWER SOURCE CIRCUIT) 

Result: 

OK 

See step  3

1. Disconnect the A63 cooling fan motor connector.
2. Remove the EFI-MAIN 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
   A63-4 (IGS1) - 1B-4	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   A63-4 (IGS1) or 1B-4 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  4

1. Disconnect the A63 cooling fan motor connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A63-2 (E1) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  5

1. Disconnect the A47 ECM connector.
2. Disconnect the A63 cooling fan motor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   A63-3 (SI) - A47-32 (RFC)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   A63-3 (SI) or A47-32 (RFC) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COOLING FAN MOTOR. Refer to  REMOVAL [06/2018 - 09/2019]  , or refer to  REMOVAL [09/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

Result: 

NG 

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

1. Disconnect the A47 ECM connector.
2. Disconnect the A63 cooling fan motor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A47-32 (RFC) - A63-3 (SI)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COOLING FAN MOTOR. Refer to  REMOVAL [06/2018 - 09/2019]  , or refer to  REMOVAL [09/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

Result: 

NG 

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