|DTC Code||DTC Name|
|P0A94-442||DC / DC Converter Performance|
The boost converter boosts the 230.4 V DC from the HV battery to a maximum of approximately 650 V DC. The inverter converts the voltage that has been boosted by the boost converter into alternating current, which is used for driving generator (MG1) and motor (MG2). When a motor or generator operates as a generator, the alternating current that it creates is converted into direct current by the inverter. Then the boost converter drops this voltage to direct current of approximately 230.4 V in order to charge the HV battery.
The MG ECU uses a voltage sensor (VL) that is built into the boost converter to detect the high voltage before it is boosted. It also uses a voltage sensor (VH) that is built into the inverter to detect the high voltage after it is boosted. Based on the voltage before and after it is boosted, the MG ECU controls the operation of the boost converter to boost the voltage to the target voltage.
|DTC No.||DTC Detection Condition||Trouble Area|
Abnormal voltage execution value
Boosting cannot be performed as requested due to a boost converter system malfunction.
(1 trip detection logic)
With the vehicle stopped, apply the parking brake and turn the power switch on (READY).
With the shift lever in P, depress the brake pedal firmly, and quickly and fully depress the accelerator pedal.
Immediately after the accelerator pedal is fully depressed, "VH-Voltage after boosting" will be between 400 and 650 V.
|DTC No.||Data List|
|P0A94-442||VH-Voltage after Boosting|
Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work Click here.
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
Turn the power switch on (READY).
With the engine stopped and the shift lever in P, depress the accelerator pedal to start the engine.
CHECK DTC OUTPUT (HYBRID CONTROL)
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
Check for DTCs.
|P0A94-442 only is output, or DTCs except the ones in the table below are also output.||A|
|Any of the following DTCs are also output.||B|
|P0A1A (all INF codes)*1||Generator Control Module|
|P0A1B (all INF codes)*1||Drive Motor "A" Control Module|
|P0A1D (all INF codes)*1||Hybrid Powertrain Control Module|
|P0A3F-243||Drive Motor "A" Position Sensor Circuit|
|P0A40-500||Drive Motor "A" Position Sensor Circuit Range / Performance|
|P0A41-245||Drive Motor "A" Position Sensor Circuit Low|
|P0A4B-253||Generator Position Sensor Circuit|
|P0A4C-513||Generator Position Sensor Circuit Range / Performance|
|P0A4D-255||Generator Position Sensor Circuit Low|
|P0A60 (all INF codes)*1||Drive Motor "A" Phase V Current|
|P0A63 (all INF codes)*1||Drive Motor "A" Phase W Current|
|P0A72 (all INF codes)*1||Generator Phase V Current|
|P0A75 (all INF codes)*1||Generator Phase W Current|
|P0A78-266, 267, 279, 287, 503, 504, 505, 506, 586, 806, 807, 808||Drive Motor "A" Inverter Performance|
|P0A7A-325, 517, 518, 809, 810, 811||Generator Inverter Performance|
|P0A90-509||Drive Motor "A" Performance|
|P0A92-521||Hybrid Generator Performance|
|P0A94-547, 548, 549, 554, 555, 556, 585, 587, 589, 590||DC / DC Converter Performance|
|P0C76-523||Hybrid Battery System Discharge Time Too Long|
*1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
P0A94-442 may be stored due to a malfunction which also causes DTCs in the preceding table to be stored. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.
Turn the power switch off.
GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here
CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)
Be sure to wear insulated gloves.
Check that the service plug grip is not installed.
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
Check connection condition of the low voltage connector of the inverter with converter assembly and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter Click here.
|*A||for LHD||*B||for RHD|
Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector does not pull out.
|- The connector is connected securely.|
|- The terminals are not deformed and are connected securely.|
|- No water or foreign matter in the connector.|
|NG (The connector is not connected securely.)||B|
|NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)||C|
When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.
REPAIR OR REPLACE HARNESS OR CONNECTOR