DTC P1DA4

WARNING: This page is about a different variant/trim than selected.

DTC P1DA4: VCU Inverter Short

General Description

Courtesy of HONDA, U.S.A., INC.

Symptom 1

When an overcurrent (short circuit current) passes through the IGBT at the voltage control unit (VCU) side, the power control unit (PCU) detects a trouble (SC) with the GDIC function and, at the same time when outputting a failure information (SC) to the high-voltage microcomputer, blocks a gate signal. The failure information (SC) from the GDIC is released after a specified time has elapsed if the failure is restored to normal. If a specified number of SC signals are issued, the motor control module in the PCU detects a malfunction and stores a DTC.

Symptom 2

When a trouble with the power supply which drives the IGBT at the VCU side occurs, the PCU detects a trouble (F15V) with the GDIC function and, at the same time when outputting a failure information (F15V) to the high-voltage microcomputer, blocks a gate signal. If an F15V signal detects a trouble for the specified time, the motor control module in the PCU detects a malfunction and stores a DTC.

Symptom 3

If the high-side IGBT of the VCU fails (is turned off), a V2 overvoltage or V0 overvoltage occurs at regeneration operation. If a V2 overvoltage or V0 overvoltage occurs in specified times, 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	180 milliseconds or more120 milliseconds or more870 milliseconds or more**
DTC Type	One drive cycle, MIL on, POWER SYSTEM indicator on

*: Symptom 1

**: Symptom 2

***: Symptom 3

Enable Conditions

Condition	Minimum	Maximum
12 volt battery voltage**	8 V	-

Condition	Minimum	Maximum
High voltage side power supply voltage (6 V)	5 V	-

Malfunction Threshold

One of these symptoms occurs:

Symptom 1

If an SC detection arising from IGBT overcurrent (short circuit current) occurs three times consecutively.

Symptom 2

If an F15V detection arising from a trouble with the power supply which drives the IGBT occurs continuously for at least 120 milliseconds.

Symptom 3

If a V2 overvoltage or V0 overvoltage occurs four times consecutively while the VCU operates.

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.