Transfer Case - Diagnosis - New Venture 233 (SELECTABLE 4WD): Description

NOTE: New Venture 233 electronic control system is also called Selectable 4WD or Electronic Shift System.

New Venture 233 is optional on "T" series trucks. It is an electronic-shift transfer case, with 3 modes of operation including 2HI, 4HI and 4LO. Floor-mounted shifter is eliminated, replaced by a switch on upper right side of instrument panel which is used to select operating range. Indicator lights on switch show current mode of operation. When 4WD is selected, indicator light will turn on. Light will blink while front axle is engaging.

Shift select button displays transfer case mode and range, self-test, Diagnostic Trouble Codes (DTC), and electronic shift mechanical engaging problems.

When transfer case is in 2HI, both 4HI and 4LO switch circuits are open and both lights are off. When 4WD button is pressed, 4WD indicator light turns on when front axle is engaged. Shifting of transfer case is performed by motor/encoder that receives signals from Transfer Case Control Module (TCCM). If correct input signals are received, TCCM will send drive voltages to motor/encoder which will position transfer case to proper shift position.

A range shift can only be made with automatic transmission in Neutral or with manual transmission clutch fully depressed. Shift occurs when vehicle speed is less than 3 MPH. If range shift to 4LO is selected when vehicle speed is more than 3 MPH, TCCM will default and position transfer case in 4HI.