LINEDSD in Bench Mode

The LINEDSD in Bench Mode may be used when carrying out an electrical check on the EPC solenoid or used to test the functionality of the transmission's electronic control of the line pressure. When testing the EPC for controlling the line pressure the technician is required to run the engine greater then 1500 rpm. The hookup of a hydraulic pressure gauge is required to actually test whether the transmission line pressure is correct. This will test whether the hydraulic pump, the pressure regulator and the EPC solenoid and other associated mechanical and hydraulic components are working properly.

The line pressure may be commanded between 60 psi and 180 psi. When carrying out an electrical test on the EPC solenoid, set LINEDSD to 180 psi to command the EPC solenoid OFF and 75 psi to command the PCA solenoid ON. Commanding the 180 psi may not electrically turn the pressure solenoid completely off and commanding 75 psi may not electrically turn the pressure solenoid completely on.

The OSC functions for the parameter LINEDSD allows the technician to choose the following options:

• 75 - Directs PCM to command line pressure to 75 psi.
• 100 - Directs PCM to command line pressure to 100 psi.
• 125 - Directs PCM to command line pressure to 125 psi.
• 150 - Directs PCM to command line pressure to 150 psi.
• 175 - Directs PCM to command line pressure to 175 psi.
• XXX - Cancels OSC command line pressure (returns to normal operation).

The vehicle requirements for sending an OSC value for LINEDSD in Bench Mode is as follows:

• Key on/engine off or key on/engine running (engine speed greater then 1500 rpm).
• Gear selector in PARK or NEUTRAL.

The vehicle requirements must be met when sending the OSC value for PCA. If the vehicle requirements are not met when sending the OSC value, an ERROR MESSAGE will appear. When the ERROR MESSAGE is received, OSC is aborted and must be restarted. After the OSC value for PCA is sent, if the vehicle requirements are no longer met the ERROR MESSAGE will not appear but the OSC value will be canceled by the PCM (monitoring corresponding PID). The OSC value XXX may be sent anytime to cancel OSC.