DESCRIPTION Refer to the description for DTC P0C7396.
Click here  The inverter water pump assembly sends the inverter water pump speed (measured value) signal to the hybrid vehicle control ECU. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Warning Indicate | |
P314A31 | Motor Electronics Coolant Pump "A" No Signal |
The inverter water pump speed signal is not sent to the hybrid vehicle control ECU when the power switch is turned on (READY).*
(1 trip detection logic) |
- Wire harness or connector
- Hybrid vehicle control ECU
- Inverter water pump assembly
- INV W/PMP fuse
- IGCT relay
- IGCT fuse
| Comes on |
Master Warning Light: Comes on | *: Either of the following conditions is met.
- A malfunction (open, short to +B or short to ground) in the speed signal
line from the inverter water pump assembly to the hybrid vehicle
control ECU is detected.
- A malfunction in the +B line is detected.
- A malfunction in the inverter water pump assembly power source circuit is detected.
- A malfunction in hybrid vehicle control ECU power source circuit is detected.
Related Data List |
DTC No. | Data List | |
P314A31 |
- Inverter Water Pump Revolution
- Inverter Water Pump Duty Ratio
| Related Active Test |
DTC No. | Active Test | |
P314A31 | Activate the Inverter Water Pump | MONITOR DESCRIPTION
The
hybrid vehicle control ECU monitors the speed of the inverter water
pump assembly. If the inverter water pump speed signal is not sent to
the hybrid vehicle control ECU, the hybrid vehicle control ECU will
illuminate the MIL and store a DTC. MONITOR STRATEGY |
Related DTCs | P314A (INF P314A31): Inverter water pump malfunction | |
Required sensors/components |
Inverter Water Pump Assembly | |
Frequency of operation |
Continuous | | Duration |
TMC's intellectual property | |
MIL operation | Immediately | |
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 P314A (INF P314A31) 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
- When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
- Turn the power switch on (READY) and wait for 2 minutes or more. [*1]
HINT:
[*1] : 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 or N/A, perform the normal judgment procedure again.
WIRING DIAGRAM Refer to the wiring diagram for DTC P0C7396.
Click here PROCEDURE
Click here
|
NEXT |
 | |
| 2. |
PERFORM ACTIVE TEST USING TECHSTREAM (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 with motor assembly may not operate.
- When the inverter water pump with motor assembly signal line (SWP - IWP)
is open or its connection is faulty, the inverter water pump with motor
assembly is operated forcibly.
(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 Inverter Water Pump.
(d) Perform the "Activate the Inverter Water Pump" Active Test. Powertrain > Hybrid Control > Active Test
|
Tester Display | | Activate the Inverter Water Pump |
(e) Touch the inverter water pump assembly and check that it is operating (vibrating).
OK: The inverter water pump is operating (vibrating). HINT:
Perform the Active Test with the inverter coolant temperature between -15 and 65°C (5 to 149°F).
(f) Turn the power switch off.
| NG |  |
GO TO STEP 9 |
|
OK | |
| |
| 3. |
CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) |
Click here
| NG |
| CONNECT SECURELY |
|
OK | |
| |
| 4. |
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR) |
Click here
| NG |
| CONNECT SECURELY |
|
OK | |
| |
| 5. |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WATER PUMP ASSEMBLY) |
(a) Disconnect the A23 hybrid vehicle control ECU connector. (b) Disconnect the X1 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 | |
A23-14 (NIWP) - X1-2 (NWP) |
Power switch off |
Below 1 Ω | Standard Resistance (Check for Short): |
Tester Connection | Condition |
Specified Condition | |
A23-14 (NIWP) or X1-2 (NWP) -Body ground and other terminals |
Power switch off |
10 kΩ or higher | |
 |
|
*a | Rear view of wire harness connector
(to Hybrid Vehicle Control ECU) | |
*b | Front view of wire harness connector
(to Inverter Water Pump Assembly) | | |
(d) Reconnect the X1 inverter water pump assembly connector. (e) Reconnect the A23 hybrid vehicle control ECU connector.
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 6. |
CHECK HYBRID VEHICLE CONTROL ECU | (a) Disconnect the X1 inverter water pump assembly connector.
(b) Turn the power switch on (IG).
| (c) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
A23-14 (NIWP) - G46-6 (E1) |
Power switch on (IG) |
11 to 14 V | |
 |
|
*a | Component with harness connected
(Hybrid Vehicle Control ECU) | | |
(d) Turn the power switch off. (e) Reconnect the X1 inverter water pump assembly connector.
| NG |
| REPLACE HYBRID VEHICLE CONTROL ECU |
|
OK | |
| |
Click here
|
NEXT | |
| |
| 8. |
PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE INVERTER 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 Inverter Water Pump.
(d) Perform the "Activate the Inverter Water Pump" Active Test. Powertrain > Hybrid Control > Active Test
|
Tester Display | | Activate the Inverter Water Pump |
| (e)
Connect an oscilloscope between the hybrid vehicle control ECU
terminals specified in the table below, and measure the waveform. |
Item | Content | |
Terminal | A23-14 (NIWP) - G46-6 (E1) | |
Equipment Setting | 5 V/DIV., 5 ms./DIV. | |
Condition | Power switch on (IG), during Active Test |
OK: The period of the wavelength is 13 msec or less. |
 |
|
*a | Component with harness connected
(Hybrid Vehicle Control ECU) | | |
(f) Turn the power switch off.
| OK | |
REPLACE HYBRID VEHICLE CONTROL ECU |
| NG |
| GO TO STEP 12 |
| 9. |
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR) |
Click here
| NG |
| GO TO STEP 14 |
|
OK | |
| |
| 10. |
CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - IGCT RELAY) |
(a) Remove the IGCT relay from the No. 3 relay block. (b) Disconnect the X1 inverter water pump assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*1 | No. 3 Relay Block |
*2 | IGCT Relay Holder | |
*a | Front view of wire harness connector
(to Inverter Water Pump Assembly) |
- | - |
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
X1-4 (+BWP) - 5 (IGCT relay holder) |
Power switch off | Below 1 Ω |
NOTICE: Do
not apply excessive force when using the probes of the tester to
perform the inspection. If excessive force is used, the terminals will
be damaged.
HINT:
- Connectors
Slightly shake the connector vertically and horizontally.
- Wire Harness
Slightly shake the wire harness vertically and horizontally.
The connector joint and fulcrum of the vibration are the major areas that should be checked thoroughly.
- No. 3 Relay Block
Apply slight vibration with a finger to the No. 3 relay block and check whether a malfunction occurs.
- INV W/PMP fuse
Apply slight vibration with a finger to the INV W/PMP fuse and check whether a malfunction occurs.
- IGCT relay
Apply slight vibration with a finger to the IGCT relay and check whether a malfunction occurs.
|
*a | Example | |
*b | Shake Slightly | |
*c | Vibrate Slightly |
(d) Reconnect the X1 inverter water pump assembly connector. (e) Install the IGCT relay.
| NG |
| GO TO STEP 15 |
|
OK | |
| |
| 11. |
CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND) |
(a) Disconnect the X1 inverter water pump assembly connector.
| (b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
X1-1 (GND) - Body ground |
Power switch off |
Below 1 Ω | |
 |
|
*a | Front view of wire harness connector
(to Inverter Water Pump Assembly) | | |
(c) Reconnect the X1 inverter water pump assembly connector.
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 12. |
REPLACE INVERTER WATER PUMP ASSEMBLY | Click here
|
NEXT | |
| |
| 13. |
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 |
| 14. |
CHECK FUSE (INV W/PMP) |
| (a) Remove the INV W/PMP fuse from the No. 4 relay block. |
 |
|
*1 | No. 4 Relay Block | |
*2 | INV W/PMP Fuse | | |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
INV W/PMP fuse | Always |
Below 1 Ω | (c) Install the INV W/PMP fuse.
| OK |
| CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR) |
| NG |
| GO TO STEP 18 |
| 15. |
CHECK INSTALLATION CONDITION (INV W/PMP FUSE) |
(a) Check installation condition of the INV W/PMP fuse. OK: INV W/PMP fuse is installed correctly.
| NG |
| GO TO STEP 19 |
|
OK | |
| |
| 16. |
CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY CIRCUIT) |
(a) Remove the INV W/PMP fuse from No. 4 relay block. (b) Remove the IGCT relay from the No. 3 relay block.
(c) Disconnect the X1 inverter water pump assembly connector. (d) Measure the resistance according to the value(s) in the table below.
|
*1 | No. 3 Relay Block |
*2 | IGCT Relay Holder | |
*3 | No. 4 Relay Block |
*4 | INV W/PMP Fuse Holder | |
*a | Front view of wire harness connector
(to Inverter Water Pump Assembly) |
- | - |
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
2 (INV W/PMP fuse holder) - X1-4 (+BWP) |
Power switch off | Below 1 Ω | |
1 (INV W/PMP fuse holder) - 5 (IGCT relay holder) |
Power switch off | Below 1 Ω | |
2 (INV W/PMP fuse holder) or X1-4 (+BWP) - Body ground and other terminals |
Power switch off | 10 kΩ or higher |
NOTICE: Do
not apply excessive force when using the probes of the tester to
perform the inspection. If excessive force is used, the terminals will
be damaged. (e) Reconnect the X1 inverter water pump assembly connector.
(f) Install the IGCT relay. (g) Install the INV W/PMP fuse.
| NG |
| GO TO STEP 21 |
|
OK | |
| |
| 17. |
CHECK FUSE (INV W/PMP) |
| (a) Remove the INV W/PMP fuse from the No. 4 relay block. |
 |
|
*1 | No. 4 Relay Block | |
*2 | INV W/PMP Fuse | | |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
INV W/PMP fuse | Always |
Below 1 Ω | (c) Install the INV W/PMP fuse.
| OK |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/PMP FUSE HOLDER TERMINAL) |
| NG |
| GO TO STEP 22 |
(a) Connect the inverter water pump assembly connector securely.
| NEXT |
| REPLACE FUSE (INV W/PMP) |
| 19. |
CHECK FUSE HOLDER TERMINAL (INV W/PMP FUSE) |
(a) Check the terminals of the INV W/PMP fuse holder. OK: The terminals of the INV W/PMP fuse holder are not bent, loose or corroded.
| NG |
| GO TO STEP 26 |
|
OK | |
| |
| 20. |
CHECK FUSE (INV W/PMP) |
| (a) Remove the INV W/PMP fuse from the No. 4 relay block. |
|
|
|
*1 | No. 4 Relay Block | |
*2 | INV W/PMP Fuse | | |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
INV W/PMP fuse | Always |
Below 1 Ω | (c) Install the INV W/PMP fuse.
| OK |
| CONNECT SECURELY (INV W/PMP FUSE) |
| NG |
| REPLACE FUSE (INV W/PMP) |
| 21. |
CHECK FUSE (INV W/PMP) |
| (a) Remove the INV W/PMP fuse from the No. 4 relay block. |
|
|
|
*1 | No. 4 Relay Block | |
*2 | INV W/PMP Fuse | | |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
INV W/PMP fuse | Always |
Below 1 Ω | (c) Install the INV W/PMP fuse.
| OK |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| NG |
| GO TO STEP 27 |
| 22. |
CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND) |
(a) Disconnect the X1 inverter water pump assembly connector.
| (b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
X1-1 (GND) - Body ground |
Power switch off |
Below 1 Ω | |
 |
|
*a | Front view of wire harness connector
(to Inverter Water Pump Assembly) | | |
(c) Reconnect the X1 inverter water pump assembly connector.
| NG |
| GO TO STEP 27 |
|
OK | |
| |
| 23. |
CHECK FUSE HOLDER TERMINAL (INV W/PMP FUSE) |
(a) Check the terminals of the INV W/PMP fuse holder. OK: The terminals of the INV W/PMP fuse holder are not bent, loose or corroded.
| NG |
| GO TO STEP 28 |
|
OK | |
| |
| 24. |
REPLACE INVERTER WATER PUMP ASSEMBLY | Click here
|
NEXT | |
| |
| 25. |
ADD HV COOLANT AND PERFORM AIR BLEEDING |
(a) After replacing the inverter water pump with motor assembly, add HV coolant and perform air bleeding.
Click here
| NEXT |
| REPLACE FUSE (INV W/PMP) |
| 26. |
CHECK FUSE (INV W/PMP) |
| (a) Remove the INV W/PMP fuse from the No. 4 relay block. |
|
|
|
*1 | No. 4 relay block | |
*2 | INV W/PMP Fuse | | |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
INV W/PMP fuse | Always |
Below 1 Ω | (c) Install the INV W/PMP fuse.
| OK |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/PMP FUSE HOLDER TERMINAL) |
| NG |
| GO TO STEP 28 |
| 27. |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
| NEXT |
| REPLACE FUSE (INV W/PMP) |
| 28. |
REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/PMP FUSE HOLDER TERMINAL) |
| NEXT |
| REPLACE FUSE (INV W/PMP) | | 
