DTC THC_d0004: Powertrain Coolant Pump Malfunction [09/2013 - ]: Procedure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect connector D11 from the water pump with motor (for drive unit).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect connector L30 from the thermal control ECU.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   D11-4 (PTREQ) - L30-15 (PTREQ)	Power switch off	Below 1 Ω
   D11-2 (PTFDB) - L30-5 (PTFDB)	Power switch off	Below 1 Ω
   D11-3 (GND) - Body ground	Power switch off	Below 1 Ω
   D11-4 (PTREQ) or L30-15 (PTREQ) - Body ground and other terminals	Power switch off	1 kΩ or higher
   D11-2 (PTFDB) or L30-5 (PTFDB) - Body ground and other terminals	Power switch off	1 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Water Pump with Motor (for Drive Unit))
   *b	Front view of wire harness connector (to Thermal Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect connector D11 from the water pump with motor (for drive unit).
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D11-1 (IGCT) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Water Pump with Motor (for Drive Unit))

NG → See step   4 

OK: Go to next step 

1. Replace the water pump with motor (for drive unit). Refer to REMOVAL [09/2013 - ] .
2. Connect the RAV4 EV diagnostic tool to the No. 2 DLC3.
3. Turn the power switch on (READY).
4. Turn the RAV4 EV diagnostic tool on.
5. Enter the following menus: Thermal Test / Thermal System Test.
6. Perform the "Thermal System Test" Active Test.
7. Enter the following menus: DTCs.
8. Read the alert codes.
   RESULT
   
   

   Result	Proceed to
   Alert code is not output	A
   THC_d0004 is output	B

B → See step   7 

A → COMPLETED 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the P/T W/P fuse from the No. 1 motor compartment room relay block and junction block assembly.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   P/T W/P fuse terminals	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	No. 1 Motor Compartment Room Relay Block and Junction Block Assembly
   *2	P/T W/P Fuse

NG → CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

OK: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the W/P-IGCT fuse from the No. 1 motor compartment room relay block and junction block assembly.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   W/P-IGCT fuse terminals	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	No. 1 Motor Compartment Room Relay Block and Junction Block Assembly
   *2	W/P-IGCT Fuse

NG → CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

OK: Go to next step 

1. Inspect the IGCT 1 relay. Refer to ON-VEHICLE INSPECTION [09/2013 - ] - Step 1 .

NG → REPLACE IGCT 1 RELAY 

OK → REPLACE HARNESS OR CONNECTOR (IGCT 1 RELAY - WATER PUMP WITH MOTOR (FOR DRIVE UNIT), AUXILIARY BATTERY)