HYBRID / BATTERY CONTROL HYBRID CONTROL SYSTEM P314A31 Motor Electronics Coolant Pump "A" No Signal
DESCRIPTION
Refer to the description for DTC P0C7396.
The inverter water pump assembly sends the inverter water pump speed (measured value) signal to the hybrid vehicle control ECU assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate | Note |
|---|---|---|---|---|---|---|
| P314A31 | Motor Electronics Coolant Pump "A" No Signal | The inverter water pump speed signal is not sent to the hybrid vehicle control ECU assembly when the power switch is turned on (READY).*
(1 trip detection logic) |
·
Wire harness or connector ·
Hybrid vehicle control ECU assembly ·
Inverter water pump assembly ·
INV W/P NO. 1 fuse ·
INV W/PMP NO. 2 fuse ·
INV W/P relay |
Comes on | Master Warning:
Comes on |
SAE Code:
P314A |
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 assembly 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 assembly power source circuit is detected.
| DTC No. | Data List |
|---|---|
| P314A31 | ·
Inverter Water Pump Revolution ·
Inverter Water Pump Duty Ratio ·
Ready Signal |
| DTC No. | Active Test |
|---|---|
| P314A31 | 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.
·When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the power switch on (IG) and turn the GTS 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 GTS 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, perform the normal judgment procedure again.
WIRING DIAGRAM
Refer to the wiring diagram for DTC P0C7396.
PROCEDURE
- Result:
Proceed to NEXT
NEXT
- 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 1 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.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Inverter Water Pump.
Perform the "Activate the Inverter Water Pump" Active Test.
- Powertrain > Hybrid Control > Active Test
-
Tester Display Activate the Inverter Water Pump - 50004 397 1
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).
Turn the power switch off.
- Result:
Proceed to OK NG
OK
NG
- Result:
Proceed to OK NG
OK
NG
- Result:
Proceed to OK NG
OK
NG
Disconnect the A31 hybrid vehicle control ECU assembly connector.
Disconnect the A53 inverter water pump assembly connector.
| *a | Front view of wire harness connector
(to Hybrid Vehicle Control ECU Assembly) |
| *b | Front view of wire harness connector
(to Inverter Water Pump Assembly) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition A31-32 (NIWP) - A53-2 (NWP) Power switch off Below 1 Ω
- Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition A31-32 (NIWP) or A53-2 (NWP) - Body ground and other terminals Power switch off 10 kΩ or higher
Reconnect the A53 inverter water pump assembly connector.
Reconnect the A31 hybrid vehicle control ECU assembly connector.
- Result:
Proceed to OK NG
OK
NG
Disconnect the A53 inverter water pump assembly connector.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
| *a | Component with harness connected
(Hybrid Vehicle Control ECU Assembly) |
- | - |
- Standard Voltage:
Tester Connection Condition Specified Condition A31-32 (NIWP) - A30-15 (E1) Power switch on (IG) 11 to 14 V
Turn the power switch off.
Reconnect the A53 inverter water pump assembly connector.
- Result:
Proceed to OK NG
OK
NG
- Result:
Proceed to NEXT
NEXT
- 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.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Inverter Water Pump.
Perform the "Activate the Inverter Water Pump" Active Test.
- Powertrain > Hybrid Control > Active Test
-
Tester Display Activate the Inverter Water Pump - 50004 397 1
Connect an oscilloscope between the hybrid vehicle control ECU assembly terminals specified in the table below, and measure the waveform.
| *a | Component with harness connected
(Hybrid Vehicle Control ECU Assembly) |
- | - |
| Item | Content |
|---|---|
| Terminal | A31-32 (NIWP) - A30-15 (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.
Turn the power switch off.
- Result:
Proceed to OK NG
OK
NG
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly |
| *2 | INV W/P Relay |
Check installation condition of the INV W/P relay.
- OK:
INV W/P relay is installed correctly.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 3 Relay Block and Junction Block Assembly |
| *2 | IGCT Relay |
Remove the IGCT relay from the No. 3 relay block and junction block assembly.
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly |
| *2 | INV W/P Relay |
Remove the INV W/P relay from the No. 1 engine room relay block and junction block assembly.
| *a | Example |
| *b | Shake Slightly |
| *c | Vibrate Slightly |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 5 (IGCT relay) - 1 (INV W/P relay) 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 and Junction Block Assembly
Apply slight vibration with a finger to the No. 3 relay block and junction block assembly and check whether a malfunction occurs.
·No. 1 Engine Room Relay Block and Junction Block Assembly
Apply slight vibration with a finger to the No. 1 engine room relay block and junction block assembly and check whether a malfunction occurs.
·INV W/P NO. 1 fuse
Apply slight vibration with a finger to the INV W/P NO. 1 fuse and check whether a malfunction occurs.
Install the IGCT relay and INV W/P relay.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly |
| *2 | INV W/P Relay |
Remove the INV W/P relay from the No. 1 engine room relay block and junction block assembly.
| *1 | INV W/P Relay |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
Install the INV W/P relay.
- Result:
Proceed to OK NG
OK
NG
| *a | Front view of wire harness connector
(to Inverter Water Pump Assembly) |
| *a | Example |
| *b | Shake Slightly |
| *c | Vibrate Slightly |
Disconnect the A53 inverter water pump assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition A53-4 (+BWP) - Body ground Power switch on (IG) 11 to 14 V
- NOTICE:
- ·
If the power switch is turned on (IG) with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.
·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. 1 Engine Room Relay Block and Junction Block Assembly
Apply slight vibration with a finger to the No. 1 engine room relay block and junction block assembly and check whether a malfunction occurs.
·INV W/PMP NO. 2 fuse
Apply slight vibration with a finger to the INV W/PMP NO. 2 fuse and check whether a malfunction occurs.
·INV W/P Relay
Apply slight vibration with a finger to the INV W/P relay and check whether a malfunction occurs.
Reconnect the A53 inverter water pump assembly connector.
- Result:
Proceed to OK NG
OK
NG
Disconnect the A53 inverter water pump assembly connector.
| *a | Front view of wire harness connector
(to Inverter Water Pump Assembly) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition A53-1 (GND) - Body ground Power switch off Below 1 Ω
Reconnect the A53 inverter water pump assembly connector.
- Result:
Proceed to OK NG
OK
NG
- Result:
Proceed to NEXT
NEXT
After replacing the inverter water pump with motor assembly, add HV coolant and perform air bleeding.
- Result:
Proceed to NEXT
NEXT
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly |
| *2 | INV W/P Relay |
Remove the INV W/P relay from the No. 1 engine room relay block and junction block assembly.
| *1 | INV W/P Relay |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
Install the INV W/P relay.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 3 Relay Block and Junction Block Assembly |
| *2 | INV W/P NO. 1 Fuse |
Check installation condition of the INV W/P NO. 1 fuse.
- OK:
INV W/P NO.1 fuse is installed correctly.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 3 Relay Block and Junction Block Assembly |
| *2 | INV W/P NO. 1 Fuse |
Remove the INV W/P NO. 1 fuse from the No. 3 relay block and junction block assembly.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition INV W/P NO. 1 fuse Always Below 1 Ω
Install the INV W/P NO. 1 fuse.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly |
| *2 | INV W/P Relay |
Check the terminals of the INV W/P relay holder.
- OK:
The terminals of the INV W/P relay holder are not bent, loose or corroded.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly |
| *2 | INV W/PMP NO. 2 Fuse |
Check installation condition of the INV W/PMP NO. 2 fuse.
- OK:
INV W/PMP NO. 2 fuse is installed correctly.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly |
| *2 | INV W/P Relay |
Remove the INV W/P relay from the No. 1 engine room relay block and junction block assembly.
| *1 | INV W/P Relay |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
Install the INV W/P relay.
- Result:
Proceed to OK NG
OK
NG
Remove the INV W/P relay and INV W/PMP NO. 2 fuse from the No. 1 engine room relay block and junction block assembly.
Disconnect the A53 inverter water pump assembly connector.
Measure the resistance according to the value(s) in the table below.
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly | *2 | INV W/PMP NO. 2 Fuse |
| *3 | INV W/P Relay | - | - |
| *a | Front view of wire harness connector
(to Inverter Water Pump Assembly) |
- | - |
- Standard Resistance:
Tester Connection Condition Specified Condition A53-4 (+BWP) - 3 (INV W/P relay) Power switch off Below 1 Ω 2 (INV W/PMP NO. 2 fuse) or A53-4 (+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.
Reconnect the A53 inverter water pump assembly connector.
Install the INV W/P relay and INV W/PMP NO. 2 fuse.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly |
| *2 | INV W/PMP NO. 2 Fuse |
Remove the INV W/PMP NO. 2 fuse from the No. 1 engine room relay block and junction block assembly.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition INV W/PMP NO. 2 fuse Always Below 1 Ω
Install the INV W/PMP NO. 2 fuse.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly |
| *2 | INV W/P Relay |
Remove the INV W/P relay from the No. 1 engine room relay block and junction block assembly.
| *1 | INV W/P Relay |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
Install the INV W/P relay.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 3 Relay Block and Junction Block Assembly |
| *2 | INV W/P NO. 1 Fuse |
Check the terminals of the INV W/P NO. 1 fuse holder.
- OK:
The terminals of the INV W/P NO. 1 fuse holder are not bent, loose or corroded.
- Result:
Proceed to OK NG
OK
NG
Repair or replace the terminals of the INV W/P relay holder.
- Result:
Proceed to NEXT
NEXT
- Result:
Proceed to NEXT
NEXT
After replacing the inverter water pump with motor assembly, add HV coolant and perform air bleeding.
- Result:
Proceed to NEXT
NEXT
Replace INV W/P relay.
- Result:
Proceed to NEXT
NEXT
- Result:
Proceed to NEXT
NEXT
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly |
| *2 | INV W/P Relay |
Check the terminals of the INV W/P relay holder.
- OK:
The terminals of the INV W/P relay holder are not bent, loose or corroded.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 3 Relay Block and Junction Block Assembly |
| *2 | INV W/P NO. 1 Fuse |
Remove the INV W/P NO. 1 fuse from the No. 3 relay block and junction block assembly.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition INV W/P NO. 1 fuse Always Below 1 Ω
Install the INV W/P NO. 1 fuse.
- Result:
Proceed to OK NG
OK
NG
| *1 | No. 3 Relay Block and Junction Block Assembly |
| *2 | INV W/P NO. 1 Fuse |
Remove the INV W/P NO. 1 fuse from the No. 3 relay block and junction block assembly.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition INV W/P NO. 1 fuse Always Below 1 Ω
Install the INV W/P NO. 1 fuse.
- Result:
Proceed to OK NG
OK
NG
Repair or replace the terminals of the INV W/P relay holder.
- Result:
Proceed to NEXT
NEXT
Replace INV W/P relay.
- Result:
Proceed to NEXT
NEXT
Repair or replace the terminals of the INV W/P relay holder.
- Result:
Proceed to NEXT
NEXT
Replace INV W/P relay.
- Result:
Proceed to NEXT
NEXT