DTC P0A40

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

DTC P0A40: Traction Motor Rotor Position Sensor Circuit Range/Performance

General Description

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

The power control unit (PCU) detects the traction motor position by the R/D converter based on the traction motor motor rotor position sensor signals. If any of following conditions continues for a specified time, the motor control module in the PCU detects a malfunction and stores a DTC.

R/D converter excitation abnormal bit is detected.
Excitation output circuit short detection voltage is detected.
Sine/cosine signal offset voltage abnormal is detected.
Sine/cosine signal offset voltage upper limit abnormal is detected.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	280 milliseconds or more, 230 milliseconds or more210 milliseconds or more****
DTC Type	One drive cycle, MIL on, POWER SYSTEM indicator on

*: R/D converter excitation abnormal bit detection

**: Excitation output circuit short detection voltage detection

***: Sine/cosine signal offset voltage abnormal detection

****: Sine/cosine signal offset voltage upper limit abnormal detection

Enable Conditions

Condition	Minimum	Maximum
12 volt battery voltage	8 V	-

Malfunction Threshold

Any of following conditions occurs:

R/D converter excitation abnormal bit is as 1 for at least 280 milliseconds.
Excitation output circuit short detection voltage is 1 V or less for at least 230 milliseconds.
Sine/cosine signal offset voltage is out of range from 2.10 - 2.90 V for at least 280 milliseconds.
Sine/cosine signal offset voltage is 4.90 V or more for at least 210 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 motor rotor position sensor R1M/R2M line open
Traction motor motor rotor position sensor R1M/R2M line short to ground
Traction motor motor rotor position sensor R1M/R2M line short to traction motor motor rotor position sensor S1M/S2M/S3M/S4M line
Traction motor motor rotor position sensor S1M/S2M/S3M/S4M line short to other line
Traction motor motor rotor position sensor miss installed
Traction motor motor rotor position sensor 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.