HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A90-251

DTC Code	DTC Name
P0A90-251	Drive Motor "A" Performance

DESCRIPTION

When three-phase alternating current flows through the three-phase windings of the stator coil, a rotating magnetic field is generated in motor. The system controls the rotation of the magnetic field in accordance with the rotating position and speed of the rotor. As a result, the permanent magnets provided in the rotor are pulled in the direction of rotation, generating torque. The generated torque is almost proportional to the amount of current. The system controls motor speed by regulating the frequency of the alternating current. Furthermore, the system properly controls the rotating magnetic field and the angle of the rotor magnets in order to generate high torque in an efficient manner, even at high speeds.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0A90	251	Motor magnetic force deterioration or same phase short circuit	Hybrid vehicle motor assembly Motor cable Inverter with converter assembly

INSPECTION PROCEDURE

CAUTION:

Before inspecting the high-voltage system, 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.

Tech Tips

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note

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.

PROCEDURE

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / DTC.

Check if DTCs are output.

Result

Result	Proceed to
P0A90-251 only is output.	A
Any of the following DTCs are also output.	B

DTC No.	Relevant Diagnosis
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
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
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
P0A51-174	Drive Motor "A" Current Sensor Circuit
P0A78-202, 266, 267, 306, 586	Drive Motor "A" Inverter Performance
P0A7A-344	Generator Inverter Performance
P0A90-509	Drive Motor "A" Performance
P0A92-521	Hybrid Generator Performance
P0A94-585, 587, 589, 590	DC / DC Converter Performance
P0AA6 (all INF codes)*1	Hybrid Battery Voltage System Isolation Fault
P0C76-523	Hybrid Battery System Discharge Time Too Long
P3004-132	Power Cable Malfunction
P3233-750	Open or Short to B+ in Blocking of HV Gate Connection

Tech Tips

*1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
P0A90-251 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.

Turn the power switch off.

GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

SIMULATION TEST

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Test-drive the vehicle at a speed of 25 mph (40 km/h) for approximately 1 minute.
Enter the following menus: Powertrain / Hybrid Control / DTC.

Check if DTCs are output.

Result

Result	Proceed to
P0A90-251 is output or no DTC is output.	A
P0A78-306 or P0A90-509 is output.	B

Turn the power switch off.

GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)
CAUTION:

Be sure to wear insulated gloves.
1. Check that the service plug grip is not installed.
  
  Note
  
  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.
  
  Note
  
  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.
2. Check the connection of the low voltage connector of the inverter with converter assembly.
  
  OK
  
  The connector is connected securely and there are no contact problems.
  
  Tech Tips
  
  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.
NG
CONNECT SECURELY

OK

OK
The connector is connected securely and there are no contact problems.

CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

Note

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.
Remove the inverter cover from the inverter with converter assembly.

Check that the bolts for the motor cable are tightened to the specified torque, the motor cable is connected securely, and there are no contact problems.

Specified Condition
Bolt A
T=8.0 Nm {82 kgfcm, 71 in.*lbf}
Bolt B
T=9.2 Nm {94 kgfcm, 81 in.*lbf}

Note

Make sure that the tightening torque of the bolt A is between 6.4 and 9.6 N*m (65 and 98 kgf*cm, 57 and 85 in.*lbf).
Make sure that the tightening torque of the bolt B is between 6.4 and 12 N*m (65 and 122 kgf*cm, 57 and 106 in.*lbf).

Disconnect the motor cable from the inverter with converter assembly.

Check for arc marks at the bolts for the motor cable.

Result

Result		Proceed to
The terminals are connected securely and there are no contact problems.	There are no arc marks.	A
The terminals are not connected securely and there is a contact problem.	There are arc marks.	B
The terminals are not connected securely and there is a contact problem.	There are no arc marks.	C
The terminals are connected securely and there are no contact problems.	There are arc marks.	B

Connect the motor cable to the inverter with converter assembly.
Install the inverter cover.

REPLACE MALFUNCTIONING PARTS

CONNECT SECURELY

CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

Note

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 that the bolts for the motor cable are tightened to the specified torque, the motor cable is connected securely, and there are no contact problems.

Specified Condition

T=10 N*m {102 kgf*cm, 7 ft.*lbf}

Note

Make sure that the tightening torque of the bolts is between 8 and 12 N*m (82 and 122 kgf*cm, 71 and 106 in.*lbf).
Disconnect the motor cable from the hybrid transaxle assembly.

Specified Condition
T=10 Nm {102 kgfcm, 7 ft.*lbf}

Check for arc marks at the bolts for the motor cable.

Result

Result		Proceed to
The terminals are connected securely and there are no contact problems.	There are no arc marks.	A
The terminals are not connected securely and there is a contact problem.	There are arc marks.	B
The terminals are not connected securely and there is a contact problem.	There are no arc marks.	C
The terminals are connected securely and there are no contact problems.	There are arc marks.	B

Connect the motor cable to the hybrid transaxle assembly.

REPLACE MALFUNCTIONING PARTS

CONNECT SECURELY

CHECK MOTOR CABLE

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

Note

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.
Remove the motor cable.

Text in Illustration
*1	Motor Cable (Inverter with Converter Assembly Side)
*2	Shielded Ground
*3	Motor Cable (Hybrid Vehicle Transaxle Assembly Side)

Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.

Note

Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
c1-1 (W) - Body ground and shield ground	Power switch off	100 MΩ or higher
c1-2 (U) - Body ground and shield ground	Power switch off	100 MΩ or higher
c1-3 (V) - Body ground and shield ground	Power switch off	100 MΩ or higher

Note

Wrap the terminal of the three-phase AC cable with insulating tape to prevent them from coming into contact with body ground

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Switch Condition	Specified Condition
c1-1 (W) - c2-1 (W)	Power switch off	Below 1 Ω
c1-2 (U) - c2-3 (U)	Power switch off	Below 1 Ω
c1-3 (V) - c2-2 (V)	Power switch off	Below 1 Ω
c1-1 (W) - c2-3 (U)	Power switch off	100 MΩ or higher
c1-2 (U) - c2-2 (V)	Power switch off	100 MΩ or higher
c1-3 (V) - c2-1 (W)	Power switch off	100 MΩ or higher

Install the motor cable.

REPLACE MOTOR CABLE Click here

REPLACE HYBRID VEHICLE MOTOR ASSEMBLY Click here