DTC Code | DTC Name |
---|---|
P314A-828 | Inverter Coolant Pump Speed Signal |
DESCRIPTION
Refer to the description for DTC P0C73-776 Click here.
The inverter water pump assembly sends the water pump speed (measured value) signal to the hybrid vehicle control ECU. If the inverter water pump speed (measured value) signal is not sent to the hybrid vehicle control ECU when the power switch is on (READY), this DTC is stored.
DTC No. | INF Code | DTC Detection Condition | Trouble Area |
---|---|---|---|
P314A | 828 | The water pump speed signal is not sent to the hybrid vehicle control ECU when the ignition switch is turned on (READY).*1 (1 trip detection logic) |
|
*1: Malfunction (open, short to +B or short to ground) in the speed signal line from the inverter water pump assembly or inverter water pump assembly power source circuit malfunction is suspected.
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 or speed signal line to the inverter water pump assembly is detected.
A malfunction in the inverter water pump assembly power source circuit or hybrid vehicle control ECU power source circuit is detected.
DTC No. | Data List |
---|---|
P314A-828 |
|
DTC No. | Active Test |
---|---|
P314A-828 | Activate the (Inverter) Water Pump |
WIRING DIAGRAM
Refer to the wiring diagram for DTC P0C73-776 Click here.
CAUTION / NOTICE / HINT
Tech Tips
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
Turn the ignition switch to ON (READY) and wait for 2 minutes or more.
PROCEDURE
CLEAR DTC
Connect the GTS to the DLC3.
Turn the ignition switch to ON (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
Read and record the DTCs and freeze frame data.
Clear DTCs and freeze frame data.
Turn the ignition switch off.
NEXT |
PERFORM ACTIVE TEST USING GTS (ACTIVATE THE (INVERTER) WATER PUMP)
Note
Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.
Tech Tips
When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.
Connect the GTS to the DLC3.
Turn the ignition switch to 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.
Touch the inverter water pump assembly and check that it is operating (vibrating).
OK |
---|
The inverter water pump is operating (vibrating). |
Turn the ignition switch off.
NG |
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR) Click here |
OK |
CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)
*A | for LHD |
*B | for RHD |
Check the connector connections and contact pressure of the relevant terminals for the hybrid vehicle control ECU connectors Click here.
OK |
---|
The connectors are connected securely and there are no contact pressure problems. |
NG |
CONNECT SECURELY |
OK |
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR)
Check the connector connections and contact pressure of the relevant terminals for the inverter water pump assembly connector Click here.
OK |
---|
The connectors are connected securely and there are no contact pressure problems. |
NG |
CONNECT SECURELY |
OK |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WATER PUMP ASSEMBLY)
Disconnect the hybrid vehicle control ECU connector.
Disconnect the inverter water pump assembly connector.
Measure the resistance according to the value(s) in the table below.
*a | Rear view of wire harness connector (to Hybrid Vehicle Control ECU) |
*b | Front view of wire harness connector (to Inverter Water Pump Assembly) |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Connect the hybrid vehicle control ECU connector.
Connect the inverter water pump assembly connector.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HYBRID VEHICLE CONTROL ECU
Disconnect the inverter water pump assembly connector.
Turn the ignition switch to ON (IG).
*a | Component with harness connected (Hybrid Vehicle Control ECU) |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Turn the ignition switch off.
Connect the inverter water pump assembly connector.
NG |
REPLACE HYBRID VEHICLE CONTROL ECU Click here |
OK |
CLEAR DTC
Connect the GTS to the DLC3.
Turn the ignition switch to ON (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
Read and record the DTCs and freeze frame data.
Clear DTCs and freeze frame data.
Turn the ignition switch off.
NEXT |
PERFORM ACTIVE TEST USING GTS (ACTIVATE THE (INVERTER) WATER PUMP)
Note
Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.
Tech Tips
When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.
Connect the GTS to the DLC3.
Turn the ignition switch to 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.
*a | Component with harness connected (Hybrid Vehicle Control ECU) |
Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the table below, and measure the waveform.
Item | Content |
---|---|
Terminal | A26-14 (NIWP) - F55-6 (E1) |
Equipment Setting | 5 V/DIV., 100 ms./DIV. |
Condition | Ignition switch ON (IG), during Active Test |
OK |
---|
The duration of wavelength A is 300 msec or less. |
Turn the ignition switch off.
OK |
REPLACE HYBRID VEHICLE CONTROL ECU Click here |
NG |
REPLACE INVERTER WATER PUMP ASSEMBLY Click here |
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR)
Check the connector connections and contact pressure of the relevant terminals for the inverter water pump assembly connector Click here.
OK |
---|
The connectors are connected securely and there are no contact pressure problems. |
NG |
CHECK FUSE (IGCT NO. 3) Click here |
OK |
CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - IGCT RELAY)
Remove the IGCT relay from the No. 2 engine room relay block.
Disconnect the inverter water pump assembly connector.
Measure the resistance according to the value(s) in the table below.
*1 | No. 2 Engine Room Relay Block | *2 | IGCT Relay |
*a | Front view of wire harness connector (to Inverter Water Pump Assembly) |
- | - |
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Tech Tips
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. 2 Engine Room Relay Block
Apply slight vibration with a finger to the No. 2 engine room relay block and check whether a malfunction occurs.
IGCT NO. 3 Fuse
Apply slight vibration with a finger to the IGCT NO. 3 fuse and check whether a malfunction occurs.
*a | Example |
*b | Shake Slightly |
*c | Vibrate Slightly |
Note
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.
Install the IGCT relay.
Connect the inverter water pump assembly connector.
NG |
CHECK INSTALLATION CONDITION (IGCT NO. 3 FUSE) Click here |
OK |
CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND)
Disconnect connector from the inverter water pump assembly.
*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 | ||||||
---|---|---|---|---|---|---|
|
Result | Proceed to |
---|---|
NG | A |
OK | B |
Connect the inverter water pump assembly connector.
A |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
B |
REPLACE INVERTER WATER PUMP ASSEMBLY Click here |
CHECK FUSE (IGCT NO. 3)
*1 | No. 2 Engine Room Relay Block |
*2 | IGCT NO. 3 Fuse |
Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Install the IGCT NO. 3 fuse.
OK |
CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR) |
NG |
CONNECT SECURELY Click here |
CHECK INSTALLATION CONDITION (IGCT NO. 3 FUSE)
Check the terminals of the IGCT NO. 3 fuse holder.
OK |
---|
The terminals of the IGCT NO. 3 fuse holder are not bent, loose or corroded. |
NG |
CHECK FUSE HOLDER TERMINAL (IGCT NO. 3 FUSE) Click here |
OK |
CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY CIRCUIT)
Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.
Remove the IGCT relay from the No. 2 engine room relay block.
Disconnect the inverter water pump assembly connector.
Measure the resistance according to the value(s) in the table below.
*1 | No. 2 Engine Room Relay Block | *2 | IGCT NO. 3 Fuse Holder |
*3 | IGCT Relay Holder | - | - |
*a | Front view of wire harness connector (to Inverter Water Pump Assembly) |
- | - |
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Note
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.
Install the IGCT NO. 3 fuse.
Install the IGCT relay.
Connect the inverter water pump assembly connector.
NG |
CHECK FUSE (IGCT NO. 3) Click here |
OK |
CHECK FUSE (IGCT NO. 3)
*1 | No. 2 Engine Room Relay Block |
*2 | IGCT NO. 3 Fuse |
Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Install the IGCT NO. 3 fuse.
OK |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
NG |
CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND) Click here |
CHECK FUSE HOLDER TERMINAL (IGCT NO. 3 FUSE)
Check the terminals of the IGCT NO. 3 fuse holder.
OK |
---|
The terminals of the IGCT NO. 3 fuse holder are not bent, loose or corroded. |
NG |
CHECK FUSE (IGCT NO. 3) Click here |
OK |
CHECK FUSE (IGCT NO. 3)
*1 | No. 2 Engine Room Relay Block |
*2 | IGCT NO. 3 Fuse |
Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Install the IGCT NO. 3 fuse.
OK |
CONNECT SECURELY (IGCT NO. 3 FUSE) |
NG |
REPLACE FUSE (IGCT NO. 3) |
CHECK FUSE (IGCT NO. 3)
*1 | No. 2 Engine Room Relay Block |
*2 | IGCT NO. 3 Fuse |
Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Install the IGCT NO. 3 fuse.
OK |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR Click here |
CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND)
Disconnect connector from the inverter water pump assembly.
*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 | ||||||
---|---|---|---|---|---|---|
|
Connect the inverter water pump assembly connector.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR Click here |
OK |
CHECK FUSE HOLDER TERMINAL (IGCT NO. 3 FUSE)
Check the terminals of the IGCT NO. 3 fuse holder.
OK |
---|
The terminals of the IGCT NO. 3 fuse holder are not bent, loose or corroded. |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 3 FUSE HOLDER TERMINAL) Click here |
OK |
REPLACE INVERTER WATER PUMP ASSEMBLY
Replace the inverter water pump assembly Click here.
NEXT |
ADD HV COOLANT AND PERFORM AIR BLEEDING Click here |
CHECK FUSE (IGCT NO. 3)
*1 | No. 2 Engine Room Relay Block |
*2 | IGCT NO. 3 Fuse |
Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Install the IGCT NO. 3 fuse.
OK |
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 3 FUSE HOLDER TERMINAL) |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 3 FUSE HOLDER TERMINAL) Click here |
CONNECT SECURELY
Connect the inverter water pump assembly connector securely.
NEXT |
REPLACE FUSE (IGCT NO. 3) |
REPAIR OR REPLACE HARNESS OR CONNECTOR
NEXT |
REPLACE FUSE (IGCT NO. 3) |
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 3 FUSE HOLDER TERMINAL)
NEXT |
REPLACE FUSE (IGCT NO. 3) |
REPLACE INVERTER WATER PUMP ASSEMBLY
Replace the inverter water pump assembly Click here.
NEXT |
ADD HV COOLANT AND PERFORM AIR BLEEDING Click here |
ADD HV COOLANT AND PERFORM AIR BLEEDING
After replacing the inverter water pump assembly, add HV coolant and perform air bleeding Click here.
NEXT |
REPLACE FUSE (IGCT NO. 3) |
ADD HV COOLANT AND PERFORM AIR BLEEDING
After replacing the inverter water pump assembly, add HV coolant and perform air bleeding Click here.
NEXT |
COMPLETED |