RM38T0EC _51 Engine / Hybrid System _144957 HYBRID / BATTERY CONTROL _0604232 HYBRID CONTROL SYSTEM C

HYBRID / BATTERY CONTROL  HYBRID CONTROL SYSTEM  P0C7396  Motor Electronics Coolant Pump "A" Component Internal Failure  


DTC SUMMARY

MALFUNCTION DESCRIPTION


This DTC is stored when the inverter water pump assembly is malfunctioning. The cause of this malfunction may be one of the following:

Inverter water pump assembly malfunction
·

Inverter water pump assembly internal malfunction

·

Open or short in wire harness

·

Improperly connected connector


Hybrid cooling system malfunction
·

Foreign matter in inverter water pump assembly

·

Hybrid cooling system coolant is frozen


HINT:

If this DTC is stored, the driving torque may be restricted.



DESCRIPTION

The inverter water pump assembly transmits rotation speed information to the hybrid vehicle control ECU. The hybrid vehicle control ECU monitors the speed and detects malfunctions.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate Note
P0C7396 Motor Electronics Coolant Pump "A" Component Internal Failure The inverter water pump assembly revolution speed is abnormally high or low (or stopped) for 1 minute or more.
(1 trip detection logic)
·

Inverter cooling system

·

Wire harness or connector

·

Inverter water pump assembly

·

Hybrid vehicle control ECU


Comes on Master Warning:
Comes on 		SAE Code:
P0C73

HINT:

The inverter water pump assembly operates when the ignition switch is ON (READY).


MONITOR DESCRIPTION

The hybrid vehicle control ECU monitors speed of the inverter water pump assembly. If there is an abnormality in speed, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs P0C73 (INF P0C7396): Motor Electronics Coolant Pump "A" malfunction
Required sensors/components Inverter water pump assembly
Frequency of operation Continuous
Duration TMC's intellectual property
MIL operation 1 driving cycle
Sequence of operation None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored TMC's intellectual property
Other conditions belong to TMC's intellectual property -

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property -

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU DTC P0C73 (INF P0C7396) is not detected

CONFIRMATION DRIVING PATTERN

HINT:
·

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>UTILITY

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>DTC CHECK / CLEAR



1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON and turn the GTS on.

3.

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

4.

Turn the ignition switch off and wait for 2 minutes or more.

5.

Turn the ignition switch to ON and turn the GTS on.

6.

Turn the ignition switch to ON (READY). [*1]

7.

Wait for 2 minutes or more. [*2]

HINT:

[*1] to [*2] : Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.


8.

Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

9.

Check the DTC judgment result.

HINT:
·

If the judgment result shows NORMAL, the system is normal.

·

If the judgment result shows ABNORMAL, the system has a malfunction.

·

If the judgment result shows INCOMPLETE, perform the normal judgment procedure again.




CAUTION / NOTICE / HINT

NOTICE:

If this vehicle is jump started, etc. and excessive voltage is applied to the auxiliary battery, the inverter water pump assembly may suspend control as a self-protection function and store DTCs.

(When the auxiliary battery voltage returns to normal, the inverter water pump assembly will resume normal operation. In this case it is not necessary to replace the inverter water pump assembly.)


HINT:

P0C7396 may be output as a result of the malfunction indicated by the DTCs in table below.

1.

The chart above is listed in inspection order of priority.

2.

Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)


Malfunction Content Relevant DTC
Microcomputer malfunction P060647 Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure
P06881F ECM/PCM Power Relay Sense Circuit Intermittent
Sensor and actuator circuit malfunction P314A31 Motor Electronics Coolant Pump "A" No Signal


PROCEDURE

1.INSPECT 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.

·

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.



a.

According to the display on the GTS, read the Data List.

Powertrain > Hybrid Control > Data List
Tester Display
Inverter Water Pump Revolution
50003 397 60
OK:
Tester Display Condition Specified Condition
Inverter Water Pump Revolution Ignition switch ON 200 rpm or less


HINT:

When the inverter water pump assembly is not operating, the Data List item "Inverter Water Pump Revolution" displays a value 200 rpm or less.



b.

Turn the ignition switch off.


Result:
Proceed to
OK
NG



OK

2.CLEAR DTC

NG

5.CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)
2.CLEAR DTC
a.

Read and record the DTCs and Freeze Frame Data.

Powertrain > Hybrid Control > Trouble Codes
50001 397

b.

Clear the DTCs and Freeze Frame Data.

Powertrain > Hybrid Control > Clear DTCs
50002 397

c.

Turn the ignition switch off and wait for 2 minutes or more.


Result:
Proceed to
NEXT



NEXT

3.PERFORM ACTIVE TEST USING GTS (ACTIVATE THE INVERTER WATER PUMP)
3.PERFORM ACTIVE TEST USING GTS (ACTIVATE THE INVERTER WATER PUMP)
NOTICE:
·

Make sure that the HV coolant level is above the low line of the inverter reserve tank.

·

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.

According to the display on the GTS, perform the Active Test "Activate the Inverter Water Pump" and, check the value of the Data List item "Inverter Water Pump Revolution".

Powertrain > Hybrid Control > Active Test
Active Test Display
Activate the Inverter Water Pump
Data List Display
Inverter Water Pump Revolution
50004 397 1 60
OK:
Tester Display Condition Specified Condition
Inverter Water Pump Revolution Ignition switch ON
During Active Test 		3000 to 9500 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 Water Pump Revolution" displays a value 200 rpm or less.




b.

Turn the ignition switch off.


Result:
Proceed to
OK
NG



OK

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

NG

5.CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)
4.CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>Cooling System

Result:
Result Proceed to
Ambient Temperature value is above freezing temperature of the HV coolant. A
Ambient Temperature value is below freezing temperature of the HV coolant. B



A

11.REPLACE INVERTER WATER PUMP ASSEMBLY

B

REPLACE HV COOLANT

Click hereGeneral>MAINTENANCE>COOLANT (for Inverter)>REPLACEMENT


5.CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>P056014

Result:
Proceed to
OK
NG



OK

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

NG

CONNECT SECURELY

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

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>Cooling System

Result:
Proceed to
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WATER PUMP ASSEMBLY)

NG

CONNECT SECURELY

7.CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WATER PUMP ASSEMBLY)
a.

Disconnect the hybrid vehicle control ECU connector.


b.

Disconnect the inverter water pump assembly connector.


c.

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

Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition
A197-32 (IWP) - A190-3 (SWP) Ignition switch off Below 1 Ω


Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition
A197-32 (IWP) or A190-3 (SWP) - Body ground and other terminals Ignition switch off 10 kΩ or higher


HINT:

Check the condition (looseness, deterioration, etc.) of the wire to body ground for the inverter water pump assembly.



d.

Reconnect the inverter water pump assembly connector.


e.

Reconnect the hybrid vehicle control ECU connector.


Result:
Proceed to
OK
NG



OK

8.READ VALUE USING GTS (INVERTER WATER PUMP REVOLUTION)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.READ VALUE USING GTS (INVERTER WATER PUMP REVOLUTION)
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.

Remove the INV W/PMP NO. 2 fuse from No. 1 engine room relay block and No. 1 junction block assembly.


b.

According to the display on the GTS, read the Data List.

Powertrain > Hybrid Control > Data List
Tester Display
Inverter Water Pump Revolution
50003 397 60
OK:
Tester Display Condition Specified Condition
Inverter Water Pump Revolution Ignition switch ON 200 rpm or less



c.

Turn the ignition switch off.


d.

Install the INV W/PMP NO. 2 fuse.


Result:
Proceed to
OK
NG



OK

9.CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WATER PUMP ASSEMBLY)

NG

REPLACE HYBRID VEHICLE CONTROL ECU

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID VEHICLE CONTROL ECU>REMOVAL


9.CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WATER PUMP ASSEMBLY)
a.

Disconnect the hybrid vehicle control ECU connector.


b.

Turn the ignition switch to ON.


c.

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

A458551C64
4.771,0.031 5.156,0.25 0.385,0.219 1.104,2.479 1.542,2.771 0.438,0.292 3.313,3.417 3.167,2.865 true 6.125,1.99 5.771,0.948 true 0.375,2.135 0.688,2.333 0.313,0.198 10 false *b 0.156,0.104 0.469,0.302 0.313,0.198 10 false *a 4.833,0.052 5.208,0.25 0.375,0.198 10 false I278 1.167,2.521 1.573,2.729 0.406,0.208 10 false A197 3.24,3.448 3.698,3.646 0.458,0.198 10 false IWP 6.083,2.021 6.542,2.219 0.458,0.198 10 false E1
*a Component with harness connected
(Hybrid Vehicle Control ECU) 		*b Front view of wire harness connector
(to Hybrid Vehicle Control ECU)


Standard Voltage:
Tester Connection Condition Specified Condition
A197-32 (IWP) - I278-1 (E1) Ignition switch ON 11 to 14 V


NOTICE:

Make sure to check for and clear DTCs after performing this inspection.



d.

Turn the ignition switch off.


e.

Reconnect the hybrid vehicle control ECU connector.


Result:
Proceed to
OK
NG



OK

10.CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)

NG

11.REPLACE INVERTER WATER PUMP ASSEMBLY
10.CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)
a.

Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the table below.


b.

Turn the ignition switch to ON.


c.

Check the waveform while turning the ignition switch to ON.

A535056C20
4.708,0.271 5.188,0.552 0.479,0.281 2.49,0.271 2.969,0.552 0.479,0.281 1.875,2.427 2.354,1.521 true 6.167,2.333 5.76,1.292 true 0.271,0.167 0.583,0.323 0.313,0.156 10 false *a 2.573,0.313 3.01,0.542 0.438,0.229 10 false A197 6.135,2.375 6.448,2.531 0.313,0.156 10 false E1 4.813,0.323 5.188,0.542 0.375,0.219 10 false I278 1.76,2.458 2.073,2.615 0.313,0.156 10 false IWP
*a Component with harness connected
(Hybrid Vehicle Control ECU) 		- -


Item Content
Terminal A197-32 (IWP) - I278-1 (E1)
Equipment Setting 5 V/DIV., 50 ms./DIV.
Condition Ignition switch ON

OK:

Waveform duty ratio is between 3% and 9%.



d.

Turn the ignition switch off.


Result:
Proceed to
OK
NG



OK

11.REPLACE INVERTER WATER PUMP ASSEMBLY

NG

REPLACE HYBRID VEHICLE CONTROL ECU

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID VEHICLE CONTROL ECU>REMOVAL


11.REPLACE INVERTER WATER PUMP ASSEMBLY

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>WATER PUMP WITH MOTOR>REMOVAL

Result:
Proceed to
NEXT



NEXT

12.ADD HV COOLANT AND PERFORM AIR BLEEDING
12.ADD HV COOLANT AND PERFORM AIR BLEEDING
a.

After replacing the inverter water pump assembly, add HV coolant and perform air bleeding.

Click hereGeneral>MAINTENANCE>COOLANT (for Inverter)>REPLACEMENT


Result:
Proceed to
NEXT



NEXT

END