DTC P0C73-776: Motor Electronics Coolant Pump "A" Control Performance [08/2013 - ]: Procedure

B → ADD HV COOLANT 

C → INSPECT FOR HV 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 signal 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 / Inverter W/P Revolution.
4. Read the Data List.

   Result

   Tester Display	Condition	Specified Condition
   Inverter W/P Revolution	Power switch on (IG)	625 rpm or less

   HINT: 

   When the inverter water pump assembly is not operating, the Data List item "Inverter W/P Revolution" usually displays 625 rpm continuously.

5. Turn the power switch off.

NG → See step   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

   Tester Display	Condition	Specified Condition
   Inverter W/P Revolution	Power switch on (IG)	2500 to 5875 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" usually displays 625 rpm continuously.
6. Turn the power switch off.

NG → See step   7 

OK: Go to next step 

B → See step   13 

A → See step   15 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Check the connector connections and contact pressure of the relevant terminals for the inverter water pump assembly connector. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [08/2013 - ] .

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The connectors are connected securely and there are no contact pressure problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Disconnect the A31 power management control ECU connector.
2. Disconnect the A41 inverter water pump assembly connector.
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	Condition	Specified Condition
   A31-13 (IWP) - A41-3 (SWP)	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   A31-13 (IWP) or A41-3 (SWP) - Body ground and other terminals	Power switch off	10 kΩ or higher

4. Reconnect the A31 power management control ECU connector.
5. Reconnect the A41 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 INV W/PMP fuse from the No. 2 engine room relay block.
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	Condition	Specified Condition
   Inverter W/P Revolution	Power switch on (IG)	125 rpm or less

6. Turn the power switch off.
7. Install the INV W/PMP fuse.

NG → See step   14 

OK: Go to next step 

1. Disconnect the A31 power management control ECU connector.
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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A31-13 (IWP) - H1-6 (E1)	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

   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. Reconnect the A31 power management control ECU connector.

NG → See step   15 

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

   Item	Content
   Terminal	A31-13 (IWP) - H1-6 (E1)
   Equipment Setting	5 V/DIV., 50 ms./DIV.
   Condition	Power switch on (IG)

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Power Management Control ECU)

   OK

   Waveform duty ratio is between 3% and 9%.

3. Turn the power switch off.

NG → See step   14 

OK → See step   15 

NEXT → COMPLETED