DTC P1D93
DTC P1D93: PCU Coolant Over Temperature
General Description
To control the temperature of power control unit (PCU) coolant, while monitoring the coolant temperature and the temperature of each part, the PCU drives the PCU electric coolant pump and sends a drive request to the radiator fan control (RFC) unit. If the coolant temperature is extraordinarily high although the PCU provides the PCU electric coolant pump and RFC unit with an adequate command, the 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 | Two drive cycles, MIL off, POWER SYSTEM indicator on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| PCU electric coolant pump speed[Electric Water Pump Speed (TRC)] | 1, 100 rpm | - |
[ ]: HDS Parameter
Malfunction Threshold
When the coolant temperature is 180 deg.F (82 deg.C) or more continuously for 3 seconds or more while the RFC unit operation request is High.
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.
- Water pipe leak
- Water pipe clogged
- RFC unit failure
- PCU coolant temperature sensor failure
- PCU electric coolant pump failure
- PCU internal failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the motor control module memory. If the malfunction returns in the next (second) drive cycle, the POWER SYSTEM indicator comes on and a Confirmed DTC and the freeze data are stored. The MIL does not come on.
Conditions for clearing the DTC
The POWER SYSTEM indicator is cleared if the malfunction does not return in the next trip in which the diagnostic runs. The POWER SYSTEM indicator, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.