Checking torque control state and torque, torque calculation protect RAM. ROM, or ALU when the torque calculated inside of PCM is higher than actually required torque. This type of malfunction is very difficult to find, however if it happens, it influences safety a lot. Therefore, detecting and decreasing torque is strongly required.
If desired torque is calculated much higher than actual torque, PCM senses it and decreases desired torque. The causes of this error are abnormal operation of PCM (RAM,ROM, ALU errors) and hardware malfunction such that actual air flow enters the engine is more than the flow recognized by PCM.If actual checksum do not correspont with memory checksum, PCM sets P061B. MIL(Malfunction Indicatin Lamp) turns on when the malfunction lasts till 1 driving cycle.
Item | Detecting Condition | Possible cause | |
DTC Strategy | ● Desired torque error | ● Faulty PCM | |
Enable onditions | ● Engine works | ||
Threshold value | ● Calculated torque is much higher than actual torque. | ||
Diagnosis Time | ● Continuous | ||
MIL On Condition | ● 1 driving cycle | ||
Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
▶ Substitute with a known-good PCM and check for proper operation. If the problem is corrected,replace PCM and then go to "Verification of Vehicle Repair" procedure.
There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. After testing PCM on the vehicle, use this function to reuse the PCM on the others
After a repair, it is essential to verify that the fault has been corrected.
Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
Using a Scantool, Clear the DTCs
Operate the vehicle within conditions noted in the freeze frame data or enable conditions
Monitor that all rediness test have been verified as " Complete "
Are any DTCs present ?
▶ Go to the applicable troubleshoooting procedure.
▶ System is performing to specification at this time.
