DTC Advanced Diagnostics: P061B

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

General Description

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 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 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
Engine speed [ENGINE SPEED]	1,600 rpm	–
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

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

PCM internal failure

Confirmation Procedure

Operating Condition

1.	Start the engine.
2.	Drive the vehicle under Enable Conditions (see "Engine speed [ENGINE SPEED]"and "Accelerator pedal position").

	When freeze data 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.

With the HDS

None.

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 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, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.