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Home >> Toyota >> 2012 >> Prius L4-1.8L (2ZR-FXE) Hybrid >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0C73

P0C73





HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0C73-776: Motor Electronics Coolant Pump "A" Control Performance
P0C73-776 - Motor Electronics Coolant Pump "A" Control Performance

DESCRIPTION

The inverter water pump assembly transmits rotation speed information to the power management control ECU (HV CPU). The power management control ECU (HV CPU) monitors the speed and detects malfunctions.





MONITOR DESCRIPTION

The power management control ECU (HV CPU) monitors speed of the inverter water pump assembly. If there is an abnormality in speed, the power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the power switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

4. Turn the power switch off.

5. Turn the power switch on (IG) and check that there are no abnormalities (abnormal sounds, coolant leaks, DTC output, etc).

6. Turn the power switch on (READY) and turn the Techstream on. [A]

7. Wait for 2 minutes or more.

8. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [B]

9. Check that permanent DTCs are cleared.

10. If the permanent DTCs are not cleared, perform a universal trip, and then check for permanent DTCs again.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If DTC P0A78-284, 286, P0A7A-322, 324, P0A94-553 or 557 is output, replace the inverter with converter assembly after this inspection.

PROCEDURE

1. CHECK QUANTITY OF HV COOLANT P0A01

B -- ADD HV COOLANT

C -- INSPECT FOR HV COOLANT LEAK
A -- Continue to next step.

2. CHECK COOLANT HOSE P0A01

NG -- CORRECT THE PROBLEM
OK -- Continue to next step.

3. CHECK INVERTER WATER PUMP ASSEMBLY

NOTICE:
Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List.

(d) Select Inverter W/P Revolution in the Data List.

(e) Read the Data List.

OK:

Inverter W/P Revolution is 625 rpm or less.

(f) Turn the power switch off.

NG -- CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)
OK -- Continue to next step.

4. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP)

NOTICE:
Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.

(d) Select Inverter W/P Revolution in the Data List.

(e) While performing the "Activate the Water Pump" Active Test, check Inverter W/P Revolution in the Data List.

Result:





HINT
Perform the Active Test with the inverter coolant temperature between 5 to 149°F (-15 and 65°C).

(f) Turn the power switch off.

NG -- CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)
OK -- Continue to next step.

5. CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING) P0A08

B -- REPLACE HV COOLANT

A -- REPLACE INVERTER WATER PUMP ASSEMBLY Components

6. ADD HV COOLANT

(a) Add coolant up to the high level in the reserve tank.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY

7. INSPECT FOR HV COOLANT LEAK

(a) Diagnose and repair the HV coolant leak.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY

8. CORRECT THE PROBLEM

(a) Correct the coolant hose.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY

9. CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR) P0340-886

NG -- CONNECT SECURELY
OK -- Continue to next step.

10. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR)

(a) Check the connection of the inverter water pump assembly connector.





OK:

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

NG -- CONNECT SECURELY
OK -- Continue to next step.

11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WATER PUMP ASSEMBLY)

(a) Disconnect connector A21 from the power management control ECU.

(b) Disconnect connector g1 from the inverter water pump assembly.

(c) Measure the resistance according to the value(s) in the table below.





Text in Illustration





Standard Resistance (Check for open):





Standard Resistance (Check for short):





(d) Connect the power management control ECU connector.

(e) Connect the inverter water pump assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

12. READ VALUE USING TECHSTREAM (INVERTER W/P REVOLUTION)

(a) Connect the Techstream to the DLC3.

(b) Disconnect connector g1 from the inverter water pump assembly.

(c) Turn the power switch on (IG).

(d) Enter the following menus: Powertrain / Hybrid Control / ECU Data List.

(e) Select Inverter W/P Revolution in the Data List.

(f) Read the Data List.

OK:

Inverter W/P Revolution is 125 rpm or less.

(g) Connect the inverter water pump assembly connector.

(h) Turn the power switch off.

NG -- REPLACE POWER MANAGEMENT CONTROL ECU
OK -- Continue to next step.

13. CHECK POWER MANAGEMENT CONTROL ECU

(a) Turn the power switch on (IG).

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





Text in Illustration





OK:

Waveform duty ratio is between 3% and 9%.

(c) Turn the power switch off.

NG -- REPLACE POWER MANAGEMENT CONTROL ECU

OK -- REPLACE INVERTER WATER PUMP ASSEMBLY Components

14. CONNECT SECURELY

(a) Connect the power management control ECU connectors securely.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY

15. CONNECT SECURELY

(a) Connect the inverter water pump assembly connector securely.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY

16. REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Repair or replace the wire harness or connector.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY

17. REPLACE POWER MANAGEMENT CONTROL ECU

(a) Replace the power management control ECU Components.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY

18. REPLACE POWER MANAGEMENT CONTROL ECU

(a) Replace the power management control ECU Components.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY

19. REPLACE HV COOLANT P0A01

NEXT -- Continue to next step.

20. CHECK INVERTER WATER PUMP ASSEMBLY P0A01

NG -- REPLACE INVERTER WATER PUMP ASSEMBLY Components

OK -- COMPLETED
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