P3221-314
P112 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P3221-314: Generator Inverter Temperature Sensor Circuit Range / Performance
DTC P3221-314 - Generator Inverter Temperature Sensor Circuit Range / Performance
DTC P3221-315 - Generator Inverter Temperature Sensor Circuit Range / Performance
DESCRIPTION
The HV control ECU uses a temperature sensor, which is built into the inverter, to detect the temperature of the generator inverter. The same cooling system that is routed to the MG1 and MG2 cools the inverter. This cooling system is independent from the engine cooling system.
The characteristic of the generator inverter temperature sensor is the same as the boost converter temperature sensor (P0A94-442).
The HV control ECU limits the load based on the signals transmitted by the generator inverter temperature sensor, in order to check the effectiveness of the inverter cooling system and prevent the inverter from overheating. Furthermore, the HV control ECU detects a malfunction in the wiring of the generator inverter temperature sensor, as well as in the sensor itself.
WIRING DIAGRAM
INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are servicing the high-voltage system.
- After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.
HINT: At least 5 minutes are required to discharge the high-voltage condenser inside the inverter.
PROCEDURE
1. CHECK QUANTITY OF HV COOLANT
(a) Check that there is a sufficient amount of coolant for the inverter.
OK:
There is a sufficient amount of coolant for the inverter
NG -- ADD HV COOLANT
OK -- Continue to next step.
2. CHECK COOLANT HOSE
(a) Check that the hoses of the cooling system are not bent or clogged (refer to the cooling system [ (P0A93-346)]).
OK:
The hoses of the cooling system are not bent or clogged
NG -- CORRECT TO NORMAL CONDITION
OK -- Continue to next step.
3. CHECK CONNECTION CONDITION OF WATER PUMP CONNECTOR (LOOSENESS AND POOR CONTACT)
(a) Check the connection condition of the water pump connector.
OK:
Connector has been connected securely and there is no poor connection.
NG -- CONNECT SECURELY
OK -- Continue to next step.
4. CHECK WATER PUMP WITH MOTOR ASSEMBLY
(a) Turn the power switch ON (IG).
(b) Check the operation of the water pump.
OK:
Coolant is sloshing in the reservoir tank
NG -- REPLACE WATER PUMP WITH MOTOR ASSEMBLY
OK -- Continue to next step.
5. CHECK CONNECTION CONDITION OF COOLING FAN MOTOR CONNECTOR (LOOSENESS AND POOR CONTACT)
(a) Check the connection condition of the cooling fan motor connectors.
OK:
Connectors have been connected securely and there is no poor connection.
NG -- CONNECT SECURELY
OK -- Continue to next step.
6. INSPECT COOLING FAN MOTOR
(a) Inspect the cooling fan motor (Testing and Inspection).
NG -- REPLACE COOLING FAN MOTOR AND ADD ENGINE COOLANT
OK -- Continue to next step.
7. INSPECT NO. 2 COOLING FAN MOTOR
(a) Inspect the No. 2 cooling fan motor (Testing and Inspection).
NG -- REPLACE NO. 2 COOLING FAN MOTOR AND ADD ENGINE COOLANT
OK -- Continue to next step.
8. CHECK CONNECTION CONDITION OF HYBRID VEHICLE CONTROL ECU CONNECTOR (LOOSENESS AND POOR CONTACT)
(a) Check the connection condition of all the connectors at the HV control ECU.
OK:
Connectors have been connected securely and there is no poor connection.
NG -- CONNECT SECURELY
OK -- Continue to next step.
9. CHECK CONNECTION CONDITION OF INVERTER CONNECTOR (LOOSENESS AND POOR CONTACT)
CAUTION: Wear insulated gloves before performing the following operation.
(a) Turn the power switch OFF.
(b) Remove the service plug grip (Removal).
NOTE: Turning the power switch ON (READY) with the service plug grip removed could cause malfunction. Therefore, never turn the power switch ON (READY) in this state.
(c) Remove the inverter cover (Removal).
(d) Check the connection condition of the I9 and I10 inverter connectors.
OK:
Connectors have been connected securely and there is no poor connection.
NG -- CONNECT SECURELY
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER)
CAUTION: Wear insulated gloves before performing the following operation.
(a) Check that the service plug grip and inverter cover have been removed.
(b) Disconnect the H15 HV control ECU connector.
(c) Disconnect the I9 and I10 inverter connectors.
(d) Turn the power switch ON (IG).
HINT: DTCs for the interlock switch system are output when turning the power switch ON (IG) with both service plug grip and inverter cover removed.
(e) Measure the voltage between the terminals of the HV control ECU connector and body ground.
Standard voltage:
(f) Turn the power switch OFF.
(g) Measure the resistance between the wire harness side connectors.
Standard resistance (Check for open):
Standard resistance (Check for short)
(h) Reconnect the inverter connectors.
(i) Reconnect the HV control ECU connector.
(j) Reinstall the inverter cover (Installation).
(k) Reinstall the service plug grip (Installation).
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY