Transmission - Monaco Cayman 2005 Owner's Manual

The Allison MH-2500 series transmission is a fully automatic, torque-con-
verter driven, electronically controlled transmission. The electronic controls
provide automatic gear selection in all drive ranges and automatic engagement
of the torque converter lockup clutch.
The electronic control system has five major components: the Transmission
Control Module (TCM), engine throttle position sensor, three speed sensors,
Neutral Start Back Up (NSBU) switch and the control valve module. The
TCM processes information received from the throttle position sensor, speed
sensor, NSBU switch and control valve module. The electronic control system
optimizes shift quality by using "Adaptive Shifting." A wide variety in shift-
ing under varied conditions is required before optimizing the shift quality.
Generally, five typical shifts of a shift type are needed for shift calibration.
Transmission Key Pad Functions:
• Selects Neutral by pressing N. The area around the N button has a raised
ridge so the driver can orient his hand to the Neutral button by touch.
• Selects Reverse gear by pressing R.
• Selects the forward Drive range by pressing D. The SELECT and MONITOR will indicate
"D1", indicating the transmission is in 1st gear. Throughout the subsequent up shifts or
downshifts, the SELECT and MONITOR will indicate the gear the transmission is in.
• The UPSHIFT and DOWNSHIFT arrow buttons are used to select a higher (if not in fifth
gear) or lower (if not in first gear) forward range. These buttons are not functional in NEU-
TRAL or REVERSE. One press changes the gear selected by one range. If the up or down
button is held continuously, the range will continue to change up or down until the button is
released or until the highest/lowest possible gear is selected.
• The Mode button enables economy mode.
To Enter Economy Mode:
Press the MODE button. The LED will illuminate.
To Exit Economy Mode:
Press the MODE button. The LED will extinguish.
Cayman 2005

TRANSMISSION

Chassis Information --- Section 10
080386b
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