DTC P0A90
DTC P0A90: Traction Motor Performance
General Description
If the performance of the traction motor drops, the output torque may be difficult to control as specified. To monitor the performance of the traction motor torque, the motor control module monitors the estimated torque. If the estimated torque cannot follow the specified torque for a specified time, the motor control module in the power control unit (PCU) detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 3 seconds or more |
| DTC Type | One drive cycle, MIL on, POWER SYSTEM indicator on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Traction motor speed (absolute value) | 2, 000 rpm | - |
| Traction motor torque command | 88 N.m (9.0 kgf.m, 65.0 lbf.ft) | - |
Malfunction Threshold
If the estimated torque falls below the torque reduction threshold provided by the specified torque for at least 3 seconds. A torque reduction threshold is the following value.
| Traction motor torque command | Torque reduction threshold |
|---|---|
| 88 N.m (9.0 kgf.m, 65.0 lbf.ft) | 42 N.m (4.3 kgf.m, 31.5 lbf.ft) |
| 151 N.m (15.4 kgf.m, 111.0 lbf.ft) | 105 N.m (10.7 kgf.m, 77.5 lbf.ft) |
| 320 N.m (32.7 kgf.m, 236.1 lbf.ft) | 105 N.m (10.7 kgf.m, 77.5 lbf.ft) |
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Traction motor motor rotor position sensor line failure
- ATF cooler pipe leak
- ATF cooler pipe clogged
- ATF cooler failure
- ATF pump failure
- Traction motor motor rotor position sensor miss installed
- Traction motor motor rotor position sensor failure
- Traction motor temperature sensor failure
- Traction motor failure
- PCU internal failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the motor control module memory.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.