- Inverter Water Pump Revolution
- Inverter Water Pump Duty Ratio
- Inverter Coolant Water Temperature
| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001EKKZ |
| Model Year Start: 2019 | Model: RAV4 HV | Prod Date Range: [11/2018 - 08/2020] |
| Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for 2WD with NICKEL METAL HYDRIDE BATTERY): P0C7396; Motor Electronics Coolant Pump "A" Component Internal Failure; 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020] | ||
|
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 assembly. The hybrid vehicle control ECU assembly monitors the speed and detects malfunctions.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
|---|---|---|---|---|---|
|
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 |
HINT:
The inverter water pump assembly operates when the power switch is on (READY).
Related Data List
|
DTC No. |
Data List |
|---|---|
|
P0C7396 |
|
Related Active Test
|
DTC No. |
Active Test |
|---|---|
|
P0C7396 |
Activate the Inverter Water Pump |
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
![2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for 2WD with NICKEL METAL HYDRIDE BATTERY): UTILITY](/t3Portal/stylegraphics/info.gif)
- 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).
- Wait for 2 minutes or more.
- 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 driving pattern again.
WIRING DIAGRAM
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.)
PROCEDURE
|
1. |
CHECK DTC OUTPUT (HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
P0C7396 only is output, or DTCs except the ones in the table below are also output. |
A |
|
Any of the following DTCs including pending DTCs are also output. |
B |
|
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 |
HINT:
P0C7396 may be output as a result of the malfunction indicated by the DTCs above.
- 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.)
(e) Turn the power switch off.
| B |
|
GO TO DTC CHART (HYBRID CONTROL SYSTEM)
|
|
|
2. |
READ VALUE USING TECHSTREAM (INVERTER WATER PUMP REVOLUTION) |
NOTICE:
Be sure to perform the inspection with the auxiliary battery voltage at 12 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) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Inverter Water Pump Revolution.
Powertrain > Hybrid Control > Data List
|
Tester Display |
|---|
|
Inverter Water Pump Revolution |
(d) According to the display on the Techstream, read the Data List.
OK:
|
Tester Display |
Condition |
Specified Condition |
|---|---|---|
|
Inverter Water Pump Revolution |
Power switch on (IG) |
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.
(e) Turn the power switch off.
| NG |
|
|
|
3. |
CLEAR DTC |
Click here
|
|
4. |
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 12 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) Select 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 |
(e) According to the display on the Techstream, perform the Active Test "Activate the Inverter Water Pump" and, check the value of the Data List item "Inverter Water Pump Revolution".
OK:
|
Tester Display |
Condition |
Specified Condition |
|---|---|---|
|
Inverter Water Pump Revolution |
Power switch on (IG) During Active Test |
3176 to 8617 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.
(f) Turn the power switch off.
| NG |
|
|
|
5. |
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 |
|
|
6. |
CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR) |
Click here
| NG |
|
CONNECT SECURELY |
|
|
7. |
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR) |
Click here
| NG |
|
CONNECT SECURELY |
|
|
8. |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - INVERTER WATER PUMP ASSEMBLY) |
(a) Disconnect the A29 hybrid vehicle control ECU assembly connector.
(b) Disconnect the A53 inverter water pump assembly connector.
|
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open):
Standard Resistance (Check for Short):
|
|
(d) Reconnect the A53 inverter water pump assembly connector.
(e) Reconnect the A29 hybrid vehicle control ECU assembly connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
9. |
READ VALUE USING TECHSTREAM (INVERTER WATER PUMP REVOLUTION) |
NOTICE:
Be sure to perform the inspection with the auxiliary battery voltage at 12 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) Remove the INV W/P NO. 2 fuse from No. 1 engine room relay block and junction block assembly. |
|
(c) Turn the power switch on (IG).
(d) Enter the following menus: Powertrain / Hybrid Control / Data List / Inverter Water Pump Revolution.
Powertrain > Hybrid Control > Data List
|
Tester Display |
|---|
|
Inverter Water Pump Revolution |
(e) According to the display on the Techstream, read the Data List.
OK:
|
Tester Display |
Condition |
Specified Condition |
|---|---|---|
|
Inverter Water Pump Revolution |
Power switch on (IG) |
200 rpm or less |
(f) Turn the power switch off.
(g) Install the INV W/P NO. 2 fuse.
| NG |
|
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY
|
|
|
10. |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - INVERTER WATER PUMP ASSEMBLY) |
(a) Disconnect the A29 hybrid vehicle control ECU assembly connector.
|
(b) Remove the INV W/P relay from No. 1 engine room relay block and junction block assembly. |
|
(c) Connect terminals 3 and 5 of the INV W/P relay holder.
HINT:
Make a short circuit between terminals 3 and 5 to supply +B voltage to the inverter water pump.
(d) Measure the voltage according to the value(s) in the table below.
|
*a |
Component with harness connected (Hybrid Vehicle Control ECU Assembly) |
*b |
Front view of wire harness connector (to Hybrid Vehicle Control ECU Assembly) |
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A29-34 (IWP) - A30-3 (E1) |
INV W/P relay holder terminals 3 and 5 connected Power switch off |
11 to 14 V |
NOTICE:
Make sure to check for and clear DTCs after performing this inspection.
(e) Install the INV W/P relay.
(f) Reconnect the A29 hybrid vehicle control ECU assembly connector.
| NG |
|
|
|
11. |
CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (CHECK WAVEFORM) |
(a) Connect an oscilloscope between the hybrid vehicle control ECU assembly terminals specified in the table below.
(b) Turn the power switch on (IG).
(c) Check the waveform while turning the power switch on (IG).
|
*a |
Component with harness connected (Hybrid Vehicle Control ECU Assembly) |
- |
- |
|
Item |
Content |
|---|---|
|
Terminal |
A29-34 (IWP) - A30-3 (E1) |
|
Equipment Setting |
5 V/DIV., 50 ms./DIV. |
|
Condition |
Power switch on (IG) |
OK:
Waveform duty ratio is between 3% and 9%.
(d) Turn the power switch off.
| NG |
|
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY
|
|
|
12. |
REPLACE INVERTER WATER PUMP ASSEMBLY |
Click here
|
|
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 |
|
|