Inspection Procedure

1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / ACTIVE TEST / WATER PUMP.
4. During the WATER PUMP active test, check operation of the water pump.

   OK: 

   There are ripples in the reservoir tank coolant. 

   HINT:

   The water pump is also activated in the READY-on state.

NG: Go to step   5 

OK: GO TO NEXT STEP 

1. Connect the intelligent tester to the DLC3.
2. Put the vehicle into the READY-on state.
3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / ACTIVE TEST / WATER PUMP.
4. During the WATER PUMP active test, check for pulse signals according to the table below.
   HYBRID VEHICLE CONTROL ECU
   
   

   Item	Contents
   Terminal	NIWP (H29-29) - E1 (H31-5)
   Equipment Setting	5 V/DIV, 2 ms/DIV
   Condition	During WATER PUMP active test

   Fig 1: Inspecting Hybrid Vehicle Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: 

   The waveform appears as shown in  Fig 1  . 

OK: REPLACE HYBRID VEHICLE CONTROL ECU 

NG: GO TO NEXT STEP 

1. Turn the ignition switch off.
2. Disconnect the H29 connector from the HV control ECU.
3. Disconnect the W5 water pump connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for open) 

   HV CONTROL ECU - WATER PUMP
   
   

   Tester Connection	Specified Condition
   IWP (H29-23) - SWP (W5-2)	Below 1 Ω

   Fig 2: Checking Harness And Connector (HV Control ECU - Water Pump)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

1. Disconnect the W5 water pump connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   WATER PUMP W/ MOTOR & BRACKET ASSEMBLY
   
   

   Tester Connection	Specified Condition
   NWP (W5-1) - GND (W5-3)	1 MΩ or higher

   Fig 3: Inspecting Water Pump W/ Motor And Bracket Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 

OK: REPLACE HYBRID VEHICLE CONTROL ECU 

1. Turn the ignition switch OFF.
2. Disconnect the W5 water pump w/ motor & bracket assembly connector.
   Fig 4: Identifying Water Pump W/Motor And Bracket

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   +BWP (W5-4) - GND (W5-3)	10 to 14 V

   Fig 5: Checking Harness And Connector (Water Pump)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: INSPECT POWER SOURCE CIRCUIT OF WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 

OK: GO TO NEXT STEP 

1. Check if the hoses of the cooling system are not bent or clogged.

   OK: 

   The hoses of the cooling system are not bent or clogged. 

Fig 6: Checking Coolant Hose

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CORRECT TO NORMAL CONDITION 

OK: GO TO NEXT STEP 

1. Turn the ignition switch off.
2. Disconnect the H29 connector from the HV control ECU.
3. Disconnect the W5 water pump w/ motor & bracket assembly connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   HV CONTROL ECU - WATER PUMP
   
   

   Tester Connection	Specified Condition
   IWP (H29-23) - SWP (W5-2)	Below 1 Ω

   Fig 7: Checking Harness And Connector (HV Control ECU - Water Pump)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

1. Connect the HV control ECU connector and water pump w/ motor & bracket assembly connector.
2. Turn the ignition switch to the ON position.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   HYBRID VEHICLE CONTROL ECU
   
   

   Tester Connection	Specified Condition
   IWP (H29-23) - E1 (H31-5)	Below 1 V

   Fig 8: Inspecting Hybrid Vehicle Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step   10 

NG: GO TO NEXT STEP 

1. Disconnect the H29 connector from the HV control ECU.
2. Turn the ignition switch to the ON position.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   WATER PUMP W/ MOTOR & BRACKET ASSEMBLY (SWP TERMINAL VOLTAGE)
   
   

   Tester Connection	Specified Condition
   IWP (H29-23) - E1 (H31-5)	10 to 14 V

   Fig 9: Inspecting Water Pump W/ Motor & Bracket Assembly (SWP Terminal Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 

OK: REPLACE HYBRID VEHICLE CONTROL ECU 

1. Put the vehicle into the READY-on state.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   HYBRID VEHICLE CONTROL ECU
   
   

   Tester Connection	Specified Condition
   IWP (H29-23) - E1 (H31-5)	10 to 14 V

   Fig 10: Inspecting Hybrid Vehicle Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 

NG: REPLACE HYBRID VEHICLE CONTROL ECU