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1994 Chevy Truck S10/T10 Blazer 4WD V6-262 4.3L VIN Z Copyright © 2010, ALLDATA 10.20 Page 1
Transfer Case: Description and Operation
Electric 4WD Shifting
OPERATION
On vehicles equipped with the Model 233 transfer case, there is no transfer case selector lever in the cab. The operator selects 4HI or 4LO by
pushing a three-position (4HI, 4LO, 2HI) rocker-type selector switch mounted on the instrument panel. During normal driving the transfer
case is in the 2HI mode. The switch is spring-loaded to the center position. When the transfer case is in 2HI both the 4HI and 4L0 switch
circuits are open, and both lights are off. When shifting to 4HI or 4LO the rocker switch will still return to the center position and the 4HI or
4LO light will be on. The above image shows the wiring schematic of the transfer case selector switch.
Mode Shifts
Mode shifts are shifts from:
- 2HI to 4HI
- 4HI to 2HI
A mode shift can be accomplished in any gear position and at any vehicle speed. If the system is in 2HI, the operator can shift into 4HI
merely by pressing and releasing the 4HI area of the selector rocker switch. The green 4HI status lamp flashes whenever a 2HI or 4HI shift
is initiated and continues to flash until the TCCM completes the shift (or until 30 seconds elapses). After the shift into 4HI is
accomplished, the 4HI status lamp remains lit to indicate that the system is in 4HI. The operator can shift from 4HI back to 2HI by again
pressing 4HI on the selector switch. Again, the green 4HI status lamp flashes until the shift to 2HI is complete, and then extinguishes once
the shift is complete. Both the 4HI and 4LO lamps remain oft when the vehicle is in 2HI.
Range Shifts
Range shifts are shifts between the HI and LO ranges, from:
- 2HI to 4LO
- 4HI to 4LO
- 4LO to 4HI
A range shift from 4L0 directly to 2HI cannot be made. The operator must first make range shift from 4LO to 4HI, then a mode shift from
4HI to 2HI.
A range shift can only be made with the automatic transmission in neutral or with the manual transmission clutch fully depressed. The
vehicle speed must also be below three miles per hour before the shift can occur.
Whenever a shift into 4LO is initiated, the amber 4LO status lamp flashes and continues to flash until the TCCM completes the shift (or
until 30 seconds elapses). The 4LO status lamp must glow steadily before the vehicle transmission is shifted into gear or before the clutch
pedal is released. If a range shift is initiated when the transmission is engaged or when the vehicle speed is above 3 mph, the 4LO status
lamp flashes for 30 seconds and no range shift actually occurs; the system returns to the position before the shift was initiated.
