DTC P1740 - Torque Control Circuit: Notes
On traction control, ECM pulls this circuit up to 12 volts and monitors this circuit. The TCM also monitors this circuit. Circuit provides unidirectional communication between ECM and TCM. Messages are sent every 25 milliseconds. This data is used to reduce engine torque during transmission shift events in order to improve shift feel. If ECM detects a problem on this circuit, DTC will set.
On traction control, ECM pulls this circuit down to zero volts and monitors this circuit. The ABS/TC module also monitors this circuit. Circuit provides unidirectional communication between the 2 controllers. This data is used to reduce engine torque during a wheel spin/slipping condition where traction control is needed. If ECM detects a problem on this circuit, DTC will set.
Conditions required to set DTC are:
- For transmission control:
- Circuit is tested continuously.
- Signal remains low for at least 2 seconds.
- Signal is low 3 times for at least 2.5 seconds.
- Above conditions met within 10 seconds.
- For traction control:
- Engine speed greater than 600 RPM.
- Circuit is tested continuously.
- Signal is out of range.
- Conditions met for 2.5 seconds.