DTC P1D92
DTC P1D92: PCU Electric Coolant Pump Control Circuit
General Description
The power control unit (PCU) controls the PCU electric coolant pump according to the rotational speed of the PCU electric coolant pump calculated from the frequency (duty fixed to 50 %) detected from the NEWP terminal. If either of the following conditions occurs, the motor control module in the PCU detects a malfunction and stores a DTC.
Symptom 1
If the NEWP output equivalent to "85 % duty" output when the EWP detects an open / short to power of the EWP wire or a trouble with EWP input duty waveform (continuous Hi signal) is out of a specified value for a specified time, the motor control module in the PCU detects a malfunction and stores a DTC.
Symptom 2
If the NEWP output which is output when a short circuit of the EWP wire or a trouble with EWP input duty waveform (abnormal interval) is out of a specified value for a specified time, the motor control module in the PCU detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 6.5 seconds or more*10 seconds or more** |
| DTC Type | Two drive cycles, MIL on, POWER SYSTEM indicator on |
*: Symptom 1
**: Symptom 2
Enable Conditions
Symptom 1
| Condition | Minimum | Maximum |
|---|---|---|
| PCU electric coolant pump output duty change instructions | 2 seconds | - |
| 12 volt battery voltage | 10 V | - |
| PCU electric coolant pump output duty | - | 42.6 % |
Symptom 2
| Condition | Minimum | Maximum |
|---|---|---|
| PCU electric coolant pump output duty change instructions | 2 seconds | - |
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage | 10 V | 18.6 V |
| PCU electric coolant pump output duty | 35 % | - |
Malfunction Threshold
One of these symptoms occurs:
Symptom 1
- The PCU electric coolant pump output value is more than 77.8 Hz for at least 6.5 seconds.
Symptom 2
- The PCU electric coolant pump output value is less than 8 Hz for at least 10 seconds.
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.
- PCU electric coolant pump failure
- PCU internal failure
Confirmation Procedure
Operating Condition
Turn the vehicle to the ON mode.
With the HDS
- Turn the vehicle to the ON mode.
- Select the ELECTRIC WATER PUMP TEST in the Electric Powertrain FUNCTION TEST with the HDS, then select START.
- Wait 10 seconds.
- Select the ELECTRIC WATER PUMP TEST in the Electric Powertrain FUNCTION TEST with the HDS, then select STOP.
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 MIL comes on and a Confirmed DTC and the freeze data are stored.
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.