| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000026PVL |
| Model Year Start: 2023 | Model: Corolla HV | Prod Date Range: [09/2022 - ] |
| Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P0C7396; Motor Electronics Coolant Pump "A" Component Internal Failure; 2023 - 2025 MY Corolla HV [09/2022 - ] | ||
|
DTC |
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) |
|
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 here
![2023 - 2025 MY Corolla HV [09/2022 - ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): UTILITY](/t3Portal/stylegraphics/info.gif)
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the GTS to the DLC3.
- Turn the ignition switch to ON and turn the GTS on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for 2 minutes or more.
- Turn the ignition switch to ON and turn the GTS on.
- Turn the ignition switch to ON (READY). [*1]
-
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.
- Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
-
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.
WIRING DIAGRAM
Refer to the wiring diagram for Cooling System.
Click here
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.
- The chart above is listed in inspection order of priority.
- 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 |
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.
| NG |
|
|
|
2. |
CLEAR DTC |
(a) Read and record the DTCs and Freeze Frame Data.
Powertrain > Hybrid Control > Trouble Codes
(b) Clear the DTCs and Freeze Frame Data.
Powertrain > Hybrid Control > Clear DTCs
(c) Turn the ignition switch off and wait for 2 minutes or more.
|
|
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 |
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.
| NG |
|
|
|
4. |
CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING) |
Click here
|
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 |
|
| B |
|
|
5. |
CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) |
Click here
| NG |
|
CONNECT SECURELY |
|
|
6. |
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR) |
Click here
| 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 |
|---|---|---|
|
A161-32 (IWP) - A6-3 (SWP) |
Ignition switch off |
Below 1 Ω |
Standard Resistance (Check for Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A161-32 (IWP) or A6-3 (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.
| 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 |
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.
| NG |
|
|
|
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.
|
*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 |
|---|---|---|
|
A161-32 (IWP) - I3-1 (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.
| NG |
|
|
|
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.
|
*a |
Component with harness connected (Hybrid Vehicle Control ECU) |
- |
- |
|
Item |
Content |
|---|---|
|
Terminal |
A161-32 (IWP) - I3-1 (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.
| NG |
|
|
|
11. |
REPLACE INVERTER WATER PUMP ASSEMBLY |
Click here
|
|
12. |
ADD HV COOLANT AND PERFORM AIR BLEEDING |
(a) After replacing the inverter water pump assembly, add HV coolant and perform air bleeding.
Click here
| NEXT |
|
END |
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