DTC P1D77
DTC P1D77: VCU I1 Current Sensor Circuit Range/Performance
General Description
The power control unit (PCU) controls the voltage control unit (VCU) output based on the I1 current sensor signals. If the signal current from the I1 current sensor exceeds a set 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 | Gate drive circuit is ON condition |
| Sequence | None |
| Duration | 2 seconds or more |
| DTC Type | One drive cycle, MIL on, POWER SYSTEM indicator on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage | 8 V | - |
| High voltage side power supply voltage (6 V) | 5 V | - |
| VCU control mode | Direct connection | |
| Power drive unit (PDU) 1 control mode | PWM mode | |
| Power drive unit (PDU) 2 control mode | PWM mode | |
Malfunction Threshold
The difference between the I1 current detection value and the I1 current estimated value is more than 50 A and continues for 2 seconds or more.
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 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.