DTC P1440

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

DTC P1440: Traction Motor Inverter Gate Line Open

General Description

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

The power control unit (PCU) cannot be able to output malfunction information (SC) signal which outputs by an occurrence of IGBT overcurrent if the SC detection circuit malfunctions. Three motor phase current typically generate sine waves centered around 0 A. But if it malfunctions, a part of the waveform chips or one phase fixes to 0 A resulting an occurrence of difference between the commanded current and the actual current. 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 3-phase current sensor output value 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 deviation between the current sensor output (A) and command value is out of a specified value 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	400 milliseconds or more
DTC Type	One drive cycle, MIL on, POWER SYSTEM indicator on

Enable Conditions

Condition	Minimum	Maximum
Traction motor speed*	400 rpm	-
Traction motor speed**	-	3, 000 rpm
12 volt battery voltage	8 V	-
Current width	50 A	-

*: Symptom 1

**: Symptom 2

Malfunction Threshold

One of these symptoms occurs:

Symptom 1

If a circumstance where the current sensor output value (A) is less than 29.2 A or more than -29.2 A at 95 % or more of 100 milliseconds continues for at least 400 milliseconds.

Symptom 2

The following conditions occurs 4 times within 1 second:
The condition when the phase current deviation is more than commanded current x (multiplied by) 0.22 + (plus) 32.5 A, or less than commanded current x (multiplied by) -0.22 - (minus) -32.5 A accounts for 10 % or more during 100 milliseconds.

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 power cable line failure
Traction motor motor rotor position sensor line failure
Traction motor motor rotor position 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.