P3120

DTC P3120 HV Transaxle Malfunction

CIRCUIT DESCRIPTION
The HV ECU checks the energy balance and detects abnormality if the magnetism of the motor or generator greatly decreases.

HINT:
- When using an OBD II scan tool other than TOYOTA hand-held tester, check all the steps.
- When using TOYOTA hand-held tester, confirm the information code and check it.

Detecting Condition:

Step 1 - 2:

INSPECTION PROCEDURE

CIRCUIT DESCRIPTION
The HV ECU detects the malfunction of the transmission system. Judging from a malfunction symptom, it records one of the four information codes.

Detecting Condition:

INSPECTION PROCEDURE
When Information code 239 is stored, check that the connector of the crankshaft position sensor is properly connected. If disconnected, the code 239 may be stored.
If any of these information codes is output, replace the defective part inside the HV transaxle.

CIRCUIT DESCRIPTION
The HV ECU checks the motor resolver signal voltage and circuit impedance to detect malfunction.

Detecting Condition:

Wiring Diagram:

Step 1:

INSPECTION PROCEDURE

CIRCUIT DESCRIPTION
The HV ECU checks the generator resolver signal voltage and circuit impedance to detect malfunction.

Detecting Condition:

Wiring Diagram:

Step 1 - 3:

INSPECTION PROCEDURE

CIRCUIT DESCRIPTION
The HV ECU checks the motor temperature and controls the load limitation in order to prevent the motor from overheating. Also, it detects the abnormality of the line connection of the motor temperature sensor and malfunction of the sensor itself.

Detecting Condition:

Wiring Diagram:

Step 1:

INSPECTION PROCEDURE

CIRCUIT DESCRIPTION

Detecting Condition:

INSPECTION PROCEDURE
If the information code 248 or 250 is output, replace the HV transaxle motor.

CIRCUIT DESCRIPTION
The HV ECU checks the generator resolver signal voltage and circuit impedance to detect malfunction.

Detecting Condition:

Wiring Diagram:

Step 1:

INSPECTION PROCEDURE

CIRCUIT DESCRIPTION
The HV ECU checks the generator resolver signal voltage and circuit impedance to detect malfunction.

Detecting Condition:

Wiring Diagram:

Step 1 - 3:

INSPECTION PROCEDURE

CIRCUIT DESCRIPTION
The HV ECU checks the generator temperature and controls the load limitation in order to prevent the generator from overheating. Also, it detects the abnormality of the line connection of the generator temperature sensor and the malfunction of the sensor itself.

Detecting Condition:

Wiring Diagram:

Step 1:

INSPECTION PROCEDURE

CIRCUIT DESCRIPTION

Detecting Condition:

INSPECTION PROCEDURE
If the information code 258 or 260 is output, replace the HV transaxle generator.