DTC Advanced Diagnostics: P061B (1.5L Engine)

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

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 torque from the accelerator pedal inputs, external demands, and auxiliary load information, and calculates the allowable torque of up to acceleration state leads to hazardous event for the target torque. Abnormal accelerations are detected by the relations of the target torque, the allowable torque, and the torque estimated from engine output command. There are two method 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 torque is higher than the target torque for a specified time. The allowable time changes depending on the difference width between the estimated torque and the allowable torque.
• Integration judgment method: Malfunction is established if the integration value of torque difference exceeds a threshold.

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	Minimum	Maximum
Accelerator pedal position	-	0.2 %

[ ]: HDS Parameter

Malfunction Threshold 

Both of the conditions occur:

• The estimated torque is higher than the target torque.
• Integration value of difference between the estimated torque and target torque exceeds a threshold.

Possible Cause 

Confirmation Procedure 

Operating Condition 

• Start the engine.
• Drive the vehicle under Enable Conditions (see "Engine speed [Engine Speed]" and "Accelerator pedal position").

• When freeze data or the on-board snapshot is stored, drive the vehicle under those conditions instead of Driving Pattern step 2.
• Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

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.