DTC P061B, P1A51, P1A52, P1A53

DTC P061B:  Powertrain Control Module (PCM) Internal Malfunction (Torque Calculation)

DTC P1A51:  Powertrain Control Module (PCM) Internal Malfunction (Torque Calculation Acceleration)

DTC P1A52:  Powertrain Control Module (PCM) Internal Malfunction (Torque Calculation Deceleration)

DTC P1A53:  Powertrain Control Module (PCM) Internal Malfunction (Torque Calculation Different Run)

General Description 

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

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

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

The powertrain control module (PCM) calculates the target drive force from the accelerator pedal inputs, external demands, and auxiliary load information, and calculates the allowable drive force until the acceleration state leads to a hazardous event for the target drive force. Abnormal accelerations are detected by the relations of the target drive force, the allowable drive force, and the converted drive force value of each torque command value.

• Acceleration monitor

  There are two methods to detect abnormal accelerations; time judgment method and integration judgment method. If both of the methods are judged abnormal, the PCM detects a malfunction and stores a DTC.

• • Time judgment method:

    Malfunction is established if the estimated drive force is higher than the target drive force for a specified time. The allowable time changes depending on the difference width between the estimated drive force and the allowable drive force.

  • Integration judgment method:

    Malfunction is established if the integration value of drive force difference exceeds a threshold.

• Deceleration monitor

  Deceleration monitor judges as same way as the acceleration monitor but with the negative drive force (minus sign).

• Different run monitor

  Malfunction is established if the vehicle drives opposite drive force to the driver's demand, or unintended vehicle start occurs at N position/mode for a specified time.

	Torque monitor (Representative DTC)	Torque monitor (Acceleration)	Torque monitor (Deceleration)	Torque monitor (Different Run)
DTC	P061B*	P1A51	P1A52	P1A53

*: DTC P061B is stored when DTC P1A51, P1A52, and/or P1A53 are stored.

Monitor Execution, Sequence, Duration, DTC Type 

Execution	Continuous
Sequence	None
Duration	Depending on the driving conditions
DTC Type	One drive cycle, MIL on

Enable Conditions 

Condition
Vehicle	ON mode

Malfunction Threshold 

DTC: P1A51, P1A52 

Both conditions are met:

• The estimated drive force is higher than the target drive force for a specified time. The allowable time changes depending on the difference width between the estimated drive force and the allowable drive force.
• The integration value of drive force difference exceeds a threshold.

DTC: P1A53 

The vehicle drives opposite drive force to the driver's demand or unintended vehicle start occurs at N position/mode.

Possible Cause 

Diagnosis Details 

Conditions for setting the DTC 

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot are stored in the PCM 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, the freeze data, and the on-board snapshot can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.