- Internal motor malfunction (entry of foreign matter, etc.)
- Motor permanent magnet magnetic force deterioration
- Open or short circuit in the motor coils
- Defective motor cable connection
- Open circuit or poor insulation on motor cable
Lexus NX: Drive Motor "A" Performance (P0A90-251)
Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Drive Motor "A" Performance (P0A90-251)
DTC SUMMARY
MALFUNCTION DESCRIPTION
This DTC indicates that magnetic force deterioration of the permanent magnet located in the rotor inside the motor has been detected. The cause of this malfunction may be one of the following:
| Area | Main Malfunction Description | Step |
|---|---|---|
| Inverter low-voltage circuit | The connectors are not connected properly | 3 |
| Hybrid vehicle control ECU | Hybrid vehicle control ECU internal circuit malfunction | 4 |
| Inside of inverter | Inverter with converter assembly internal circuit malfunction | 4 |
| Hybrid vehicle transaxle assembly (including motor cable) | | 5 |
DESCRIPTION
When three-phase alternating current flows through the three-phase windings of the stator coil, a rotating magnetic field is generated in the 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.
HINT:
The term "drive motor A" indicates the motor (MG2).
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P0A90-251 | Drive Motor "A" Performance | Motor magnetic force deterioration or same phase short circuit: Magnetic force of the motor decreases or a coil circuit in one of the 3 phases remains shorted for a certain period of time. (1 trip detection logic) |
| Comes on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P0A90-251 | Mtr-Temp (MG2) Max |
MONITOR DESCRIPTION
The MG ECU monitors the motor. If the MG ECU detects a reduction in the magnetic force of the motor (MG2) or an inphase short, it interprets this as a motor failure. The hybrid vehicle control ECU will illuminate the MIL and store a DTC.
MONITOR STRATEGY
| Related DTCs | P0A90 (INF 251): Magnetic force deterioration / same phase short circuit |
| Required sensors/components | Motor (MG2), inverter, motor resolver |
| Frequency of operation | Continuous |
| Duration | TMC's intellectual property |
| MIL operation | 1 driving cycle |
| Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
| The monitor will run whenever the following DTCs are not stored | TMC's intellectual property |
| Other conditions belong to TMC's intellectual property | - |
TYPICAL MALFUNCTION THRESHOLDS
| TMC's intellectual property | - |
COMPONENT OPERATING RANGE
| Hybrid vehicle control ECU | DTC P0A90 (INF 251) is not detected |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 30 seconds or more.
- Turn the power switch on (IG) and turn the Techstream on.
- Turn the power switch on (READY).
- Drive the vehicle until the cumulative traveling time driving at a vehicle speed of 40 km/h (25 mph) or more is a few minutes. (It is not necessary to drive continuously at 40 km/h (25 mph) or more)[A]
- Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [C]
-
Read the current DTCs.
HINT:
- If a current DTC is output, the system is malfunctioning.
- If current DTCs are not output, perform the following steps to check for permanent DTCs.
- Check that the permanent DTCs are cleared.
- If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.
WIRING DIAGRAM
Refer to the wiring diagram for the motor high-voltage circuit.
Click here .gif)
Refer to the wiring diagram for the shut down signal circuit.
Click here
CAUTION / NOTICE / HINT
CAUTION:
- 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
HINT:
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
NOTICE:
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
HINT:
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
- Drive the vehicle until the cumulative traveling time driving at a vehicle speed of 50 km/h (31 mph) or more is a few minutes. (It is not necessary to drive continuously at 50 km/h (31 mph) or more.)
PROCEDURE
| 1. | CHECK DTC OUTPUT (HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes| Result | Proceed to |
|---|---|
| P0A90-251 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 |
| Malfunction Content | Relevant DTC | |
|---|---|---|
| Microcomputer malfunction | P0A1A-151, 166, 658, 791 | Generator Control Module |
| P0A1B-198, 786, 794 | Drive Motor "A" Control Module | |
| P0A1C-709, 710, 713, 797 | Drive Motor "B" Control Module | |
| P0A1D (all INF codes)*1 | Hybrid Powertrain Control Module | |
| P1C2A-155 | Generator A/D Converter Circuit | |
| P1C2B-192 | Drive Motor "A" A/D Converter Circuit | |
| P1C2C-706 | Drive Motor "B" A/D Converter Circuit | |
| P1CA6-156 | Generator Control Module Malfunction | |
| P1CA7-193 | Drive Motor Control Module Malfunction | |
| P1CA8-708 | Drive Motor "B" Control Module Malfunction | |
| P1CAC-200 | Generator Position Sensor Angle Malfunction | |
| P1CAD-168 | Drive Motor "A" Position Sensor Angle Malfunction | |
| P1CAE-715 | Drive Motor "B" Position Sensor Angle Malfunction | |
| P1CAF-792 | Generator Position Sensor REF Signal Cycle Malfunction | |
| P1CB0-795 | Drive Motor "A" Position Sensor REF Signal Cycle Malfunction | |
| P1CB1-798 | Drive Motor "B" Position Sensor REF Signal Cycle Malfunction | |
| P1CB2-793 | Generator Position Sensor REF Signal Stop Malfunction | |
| P1CB3-796 | Drive Motor "A" Position Sensor REF Signal Stop Malfunction | |
| P1CB4-799 | Drive Motor "B" Position Sensor REF Signal Stop Malfunction | |
| P3133-659 | Communication Error from Generator to Drive Motor "A" | |
| P3134-661 | Communication Error from Drive Motor "A" to Generator | |
| Power source circuit malfunction | P06B0-163 | Sensor Power Supply "A" Circuit / Open |
| P06D6-511 | Sensor Reference Voltage "F" Circuit / Open | |
| P06E6-164 | Sensor Power Supply "C" Circuit / Open | |
| P1C73-512 | Sensor Standard Voltage "F" Circuit / Open | |
| Sensor and actuator circuit malfunction | 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 | |
| P0A45-669 | Drive Motor "B" Position Sensor Circuit | |
| P0A46-671 | Drive Motor "B" Position Sensor Circuit Range / Performance | |
| P0A47-670 | Drive Motor "B" 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 | |
| P0A55-687 | Drive Motor "B" Current Sensor Circuit | |
| P0BEA-290 | Drive Motor "A" Phase V Current Sensor Circuit Range / Performance | |
| P0BEE-298 | Drive Motor "A" Phase W Current Sensor Circuit Range / Performance | |
| P0BF6-683 | Drive Motor "B" Phase V Current Sensor Circuit Range / Performance | |
| P0BFA-685 | Drive Motor "B" Phase W Current Sensor Circuit Range / Performance | |
| P0E05-328 | Generator Phase V Current Sensor Circuit Range / Performance | |
| P0E09-336 | Generator Phase W Current Sensor Circuit Range / Performance | |
| P1C3C-294 | Drive Motor "A" Phase V Current Sensor Correlation | |
| P1C3D-302 | Drive Motor "A" Phase W Current Sensor Correlation | |
| P1C3E-333 | Generator Phase V Current Sensor Correlation | |
| P1C3F-341 | Generator Phase W Current Sensor Correlation | |
| P1C4A-288 | Drive Motor "A" Phase V Current Sensor Sub Circuit Range / Performance | |
| P1C4F-296 | Drive Motor "A" Phase W Current Sensor Sub Circuit Range / Performance | |
| P1C54-326 | Generator Phase V Current Sensor Sub Circuit Range / Performance | |
| P1C59-334 | Generator Phase W Current Sensor Sub Circuit Range / Performance | |
| P1C6D-501 | Drive Motor "A" Phase V Current Sensor Offset Range / Performance | |
| P1C6E-502 | Drive Motor "A" Phase W Current Sensor Offset Range / Performance | |
| P1C6F-688 | Drive Motor "B" Phase V Current Sensor Offset Range / Performance | |
| P1C70-689 | Drive Motor "B" Phase W Current Sensor Offset Range / Performance | |
| P1C71-515 | Generator Phase V Current Sensor Offset Range / Performance | |
| P1C72-516 | Generator Phase W Current Sensor Offset Range / Performance | |
| P33C1-684 | Drive Motor "B" Phase V Current Sensor Sub Circuit Range / Performance | |
| P33C6-686 | Drive Motor "B" Phase W Current Sensor Sub Circuit Range / Performance | |
| P33D8-677 | Drive Motor "B" Phase V Current Sensor Correlation | |
| P33D9-678 | Drive Motor "A" Phase W Current Sensor Correlation | |
| System malfunction | P0A78-202, 282 | Drive Motor "A" Inverter Performance |
| P0A90-509 | Drive Motor "A" Performance | |
| P0A91-702 | Drive Motor "B" Performance | |
| P0A92-521 | Hybrid Generator Performance | |
| P0A93-346 | Inverter Cooling System Performance | |
| P0AA6 (all INF codes)*1 | Hybrid Battery Voltage System Isolation Fault | |
| P0C19-306 | Drive Motor "A" Torque Delivered Performance | |
| P0C1A-704 | Drive Motor "B" Torque Delivered Performance | |
| P0C76-523 | Hybrid Battery System Discharge Time Too Long | |
| P0D2E-586 | Drive Motor "A" Inverter Voltage Sensor Circuit Range / Performance | |
| P0D2F-266 | Drive Motor "A" Inverter Voltage Sensor Circuit Low | |
| P0D30-267 | Drive Motor "A" Inverter Voltage Sensor Circuit High | |
| P0E32-585 | DC/DC Converter Voltage Sensor "A" Range / Performance | |
| P0E33-589 | DC/DC Converter Voltage Sensor "A" Low | |
| P0E34-590 | DC/DC Converter Voltage Sensor "A" High | |
| P0E71-344 | Generator Torque Delivered Performance | |
| P1C2D-587 | Hybrid Battery Voltage / DC/DC Converter Voltage Correlation | |
| P3004-132 | High Voltage Power Resource | |
HINT:
- *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
-
P0A90-251 may be output as a result of the malfunction indicated by the DTCs above.
- The chart above is listed in inspection order of priority.
- Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)
(e) Turn the power switch off.
| B | .gif) | GO TO DTC CHART (HYBRID CONTROL SYSTEM) |
|
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| 2. | SIMULATION TEST |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (READY).
(c) Clear the DTCs.
(d) Drive the vehicle at a speed of 50 km/h (31 mph) for approximately 1 minute.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
(e) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(f) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes(g) Turn the power switch off.
| Except P0A90-251 is output. | | GO TO DTC CHART (HYBRID CONTROL SYSTEM) |
|
| 3. | CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) |
Click here
| Result | Proceed to |
|---|---|
| OK | A |
| 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 |
| B | | CONNECT SECURELY |
| C | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK SHUT DOWN SIGNAL CIRCUIT |
Click here
|
| 5. | CHECK MOTOR HIGH-VOLTAGE CIRCUIT |
Click here
HINT:
If the "Motor High-voltage Circuit" inspection results are normal, perform the next step.
| NEXT | | REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY |
READ NEXT:
Hybrid Generator Performance (P0A92-261)
DTC SUMMARY MALFUNCTION DESCRIPTION This DTC indicates that magnetic force deterioration of the permanent magnet located in the rotor inside the generator has been detected. The cause of this malfunct
Inverter Cooling System Performance (P0A93-346)
DTC SUMMARY MALFUNCTION DESCRIPTION This DTC indicates when the temperature inside the inverter has become abnormal. The cause of this malfunction may be one of the following: Hybrid cooling system m
DC / DC Converter Performance (P0A94-127)
DTC SUMMARY MALFUNCTION DESCRIPTION This DTC indicates that an overvoltage in the inverter has occurred. The cause of this malfunction may be one of the following: Area Main Malfunction Descripti
SEE MORE:
Removal
REMOVAL PROCEDURE 1. REMOVE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here 2. REMOVE TRANSMISSION INPUT DAMPER ASSEMBLY (a) Using SST, hold the crankshaft pulley assembly. SST: 09213-54015 SST: 09330-00021 HINT: Part number of installation bolt for SST (crankshaft pulley holding tool): 91551-806
Removal
REMOVAL PROCEDURE 1. REMOVE FRONT SEAT ASSEMBLY LH Click here 2. REMOVE FRONT LOWER SEAT CUSHION SHIELD Click here 3. REMOVE POWER SEAT SWITCH KNOB LH Click here 4. REMOVE POWER SEAT SWITCH KNOB LH Click here 5. REMOVE FRONT SEAT CUSHION SHIELD LH Click here 6. REMOVE FRONT POWER SEAT SWI
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