DTC P0C73-776: Motor Electronics Coolant Pump "A" Control Performance [08/2015 - ]: Procedure

B → ADD HV COOLANT 

C → INSPECT FOR COOLANT LEAK 

A: Go to next step 

NG → CORRECT THE PROBLEM 

OK: Go to next step 

HINT: 

• When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.
• When the inverter water pump assembly operation command line (SWP - IWP) is open or its connection is faulty, the inverter water pump assembly is operated forcibly.

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Data List.
4. Select Inverter W/P Revolution in the Data List.
5. Read the Data List.

   Result

   Tester Display	Specified Condition
   Inverter W/P Revolution	625 rpm or less

   HINT: 

   When the inverter water pump assembly is not operating, the Data List item "Inverter W/P Revolution" displays a value lower than 625 rpm.

6. Turn the power switch off.

NG → Refer to   7 

OK: Go to next step 

NEXT: Go to next step 

HINT: 

When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.
4. Select Inverter W/P Revolution in the Data List.
5. While performing the "Activate the Water Pump" Active Test, check Inverter W/P Revolution in the Data List.

   Result

   Data List Item	Specified Condition
   Inverter W/P Revolution	2250 to 5625 rpm

   HINT: 

   • Perform the Active Test with the inverter coolant temperature between -15 and 65°C (5 to 149°F).
   • When the inverter water pump assembly is not operating, the Data List item "Inverter W/P Revolution" displays a value lower than 625 rpm.
6. Turn the power switch off.

NG → Refer to   7 

OK: Go to next step 

B → REPLACE HV COOLANT 

A → Refer to   14 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Check the connection of the inverter water pump assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The connector is connected securely and there are no contact problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Disconnect connector A21 from the power management control ECU.
2. Disconnect connector g1 from the inverter water pump assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Rear view of wire harness connector (to Power Management Control ECU)

   *b

   Front view of wire harness connector (to Inverter Water Pump Assembly)

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   g1-3 (SWP) - A21-13 (IWP)	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   g1-3 (SWP) or A21-13 (IWP) - Body ground and other terminals	Power switch off	10 kΩ or higher

4. Connect the power management control ECU connector.
5. Connect the inverter water pump assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

HINT: 

When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.

1. Connect the Techstream to the DLC3.
2. Remove the IGCT No. 3 fuse from the engine room relay block and junction block assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block and Junction Block Assembly
   *2	IGCT No. 3 Fuse

3. Turn the power switch on (IG).
4. Enter the following menus: Powertrain / Hybrid Control / ECU Data List / Inverter W/P Revolution.
5. Read the Data List.

   Result

   Tester Display	Switch Condition	Specified Condition
   Inverter W/P Revolution	Power switch on (IG)	125 rpm or less

6. Turn the power switch off.
7. Install the IGCT No. 3 fuse.

NG → Refer to   13 

OK: Go to next step 

1. Disconnect connector A21 from the power management control ECU.
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Power Management Control ECU)

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A21-13 (IWP) - L5-6 (E1)	Power switch on (IG)	11 to 14 V

   NOTE:

   Turning the power switch on (IG) with the power management control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

4. Turn the power switch off.
5. Connect the power management control ECU connector.

NG → Refer to   14 

OK: Go to next step 

1. Turn the power switch on (IG).
2. While turning the power switch on (IG), check the waveform between the power management control ECU terminals.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a	Component with Harness Connected (Power Management Control ECU)

   Item	Content
   Terminal	A21-13 (IWP) - L5-6 (E1)
   Equipment Setting	5 V/DIV., 50 ms./DIV.
   Condition	Power switch on (IG)

   OK

   Waveform duty ratio is between 3% and 9%.

3. Turn the power switch off.

NG → Refer to   13 

OK → Refer to   14