FIRM_SFT in DRIVE MODE

This OSC function is used to raise pressure during an upshift to determine whether the pressure control system is functioning correctly. Firmer shifts indicate that the pressure control system works at higher pressure. The best test for isolating pressure control system problems is to carry out the EPC solenoid test in BENCH MODE using a hydraulic pressure gauge.

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

• FIRM_SFT - Activates the firm shift channel.
• ON] - sets control pressure high for all upshifts (determined by the PCM).
• OFF]- sets control pressure to normal for all upshifts (determined by the PCM).

OSC "FIRM_SFT" DRIVE MODE operates ONLY when:

• VSS and TR sensor are operational.
• No VSS and TR sensor DTCs present.
• Transaxle range selector lever in O/D.
• Engine "ON."
• Key "ON."
• Vehicle speed greater than 2 mph.
• TCC cannot be forced ON using NGS OSC mode (PID "OSCTCC" not equal to ON)

OSC Command Values

• [ON] - sets control pressure high for all upshifts (determined by the PCM)
• [OFF]- sets control pressure to normal for all upshifts (determined by the PCM)
• [XXX] - cancel OSC for FIRM_SFT
• [SEND] - sends the values to the PCM

DRIVE MODE Procedure for FIRM_SFT.

Follow operating instructions from the NGS menu screen:

• Select "Output State Control."
• Select "Trans - Drive Mode."
• Select "PIDs" to be monitored.
• Monitor all selected PIDs during test.
• Select "Parameters - FIRM_SFT."
• Select "ON" to turn Firm Shift Mode ON.
• Select "SEND" to send command.
• Select "OFF" to turn Firm Shift Mode OFF.
• Select "SEND" to send command.
• Select "XXX" to cancel at any time.
• Select "SEND" to send command.