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P0C73





P313 HYBRID VEHICLE 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 (w/ motor) transmits rotation speed information to the hybrid vehicle control ECU. The hybrid vehicle control ECU monitors the speed and detects malfunctions.





MONITOR DESCRIPTION

The hybrid vehicle control ECU monitors speed of the inverter water pump assembly (w/ motor). If there is an abnormality in speed, the hybrid vehicle control ECU 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 ignition switch to ON and turn the Techstream on.

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

4. Turn the ignition switch off.

5. Turn the ignition switch to ON and check that there are no abnormalities (abnormal sounds, coolant leaks, DTC output, etc.).

6. Turn the ignition switch to 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, P0A79-692, 696, 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

C -- INSPECT FOR COOLANT LEAKS

B -- ADD HV COOLANT
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 (W/ MOTOR)

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 (w/ motor) may not operate.

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(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 ignition switch off.

NG -- CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE 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 (w/ motor) may not operate.

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(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 ignition switch off.

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

5. CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING) P0A01

A -- REPLACE HV COOLANT

B -- REPLACE INVERTER WATER PUMP ASSEMBLY (W/ MOTOR) Removal

6. ADD HV COOLANT

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

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY (W/ MOTOR)

7. INSPECT FOR COOLANT LEAKS

(a) Diagnose and repair the coolant leak.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY (W/ MOTOR)

8. CORRECT THE PROBLEM

(a) Correct the coolant hose.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY (W/ MOTOR)

9. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0340-886

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

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

(a) Check the connection of the inverter water pump assembly (w/ motor) 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 (HYBRID VEHICLE CONTROL ECU - INVERTER WATER PUMP ASSEMBLY (W/ MOTOR))

(a) Disconnect connector A65 from the hybrid vehicle control ECU.

(b) Disconnect connector A52 from the inverter water pump assembly (w/ motor).

(c) Turn the ignition switch to ON.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:









(e) Turn the ignition switch off.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Text in Illustration





(g) Connect the hybrid vehicle control ECU connector.

(h) Connect the inverter water pump assembly (w/ motor) connector.

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

12. CHECK HYBRID VEHICLE CONTROL ECU

(a) Connect the Techstream to the DLC3.

(b) Disconnect connector A52 from the inverter water pump assembly (w/ motor).

(c) Turn the ignition switch to ON.

(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 (w/ motor) connector.

(h) Turn the ignition switch off.

NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- Continue to next step.

13. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVE THE WATER PUMP)

(a) Turn the ignition switch to ON.

(b) While turning the ignition switch to ON, check the waveform between the hybrid vehicle control ECU terminals.





Text in Illustration





OK:

Waveform duty ratio is between 3% and 9%.

(c) Turn the ignition switch off.

NG -- REPLACE HYBRID VEHICLE CONTROL ECU

OK -- REPLACE INVERTER WATER PUMP ASSEMBLY (W/ MOTOR) Removal

14. CONNECT SECURELY

(a) Connect the hybrid vehicle control ECU connectors securely.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY (W/ MOTOR)

15. CONNECT SECURELY

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

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY (W/ MOTOR)

16. REPAIR OR REPLACE HARNESS OR CONNECTOR

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

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY (W/ MOTOR)

17. REPLACE HYBRID VEHICLE CONTROL ECU

(a) Replace the hybrid vehicle control ECU Removal.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY (W/ MOTOR)

18. REPLACE HYBRID VEHICLE CONTROL ECU

(a) Replace the hybrid vehicle control ECU Removal.

NEXT -- CHECK INVERTER WATER PUMP ASSEMBLY (W/ MOTOR)

19. REPLACE HV COOLANT P0A01

NEXT -- Continue to next step.

20. CHECK INVERTER WATER PUMP ASSEMBLY (W/ MOTOR) P0A01

NG -- REPLACE INVERTER WATER PUMP ASSEMBLY (W/ MOTOR) Removal

OK -- COMPLETED
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