DTC P0C73-776: Motor Electronics Coolant Pump "A" Control Performance: Procedure

B → See step   6 

C → See step   7 

A: Go to next step 

NG → See step   8 

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. 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

6. Turn the power switch off.

NG → See step   9 

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. 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).

6. Turn the power switch off.

NG → See step   9 

OK: Go to next step 

B → See step   20 

A → See step   22 

1. Add coolant up to the high level in the reserve tank.

NEXT → See step   21 

1. Diagnose and repair the coolant leak.

NEXT → See step   21 

1. Correct the coolant hose.

NEXT → See step   21 

NG → See step   15 

OK: Go to next step 

1. Check the connection of the inverter water pump assembly connector.
   Fig 1: Checking Connector Connection Condition (Inverter Water Pump Assembly Connector)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

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

NG → See step   16 

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.
   Fig 2: Checking Harness And Connector (Power Management Control ECU - Inverter Water Pump Assembly)

   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 → See step   17 

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. Disconnect connector g1 from the inverter water pump assembly.
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. Connect the inverter water pump assembly connector.
7. Turn the power switch off.

NG → See step   18 

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.
   Fig 3: Checking Voltage In The Harness And Connector (Power Management Control ECU - Inverter Water Pump Assembly)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A21-13 (IWP) - L5-6 (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. Connect the power management control ECU connector.

NG → See step   22 

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.
   Fig 4: Checking Power Management Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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   19 

OK → See step   22 

1. Connect the power management control ECU connectors securely.

NEXT → See step   21 

1. Connect the inverter water pump assembly connector securely.

NEXT → See step   21 

1. Repair or replace the wire harness or connector.

NEXT → See step   21 

Refer to COMPONENTS

NEXT → See step   21 

Refer to COMPONENTS

NEXT → See step   21 

NEXT: Go to next step 

NG → See step   22 

OK → COMPLETED