Caravan AWD V6-201 3.3L (1991)
On AS and FJ vehicles, the 41TE four-speed overdrive automatic transaxle includes an overdrive lockout function operated by a button on the instrument
panel. The lockout feature makes driving smoother in traffic at low and moderate speeds where overdrive is not needed. Otherwise, the transaxle may
shift in and out of overdrive, causing unnecessary shifting.
NOTE: The overdrive lockout switch on 1994 as vehicles is a momentary contact switch. No FJ vehicles use a momentary contact switch.
Pushing the instrument panel button closes the switch. The TCM then locks out overdrive and provides a ground to the O/D lockout lamp. Pushing the
button again causes the TCM to return to normal operation and turn off the overdrive lockout lamp.
With overdrive locked out, the transaxle upshifts to third gear in the same manner as in overdrive. If the "3" position is selected on AS body vehicles, a
high load is assumed and the part-throttle 2-3 upshift occurs at a higher speed to aid acceleration. If "3" is selected with overdrive locked out, an earlier
downshift to second gear occurs. Wide-open throttle shifts are unaffected by use of the overdrive lockout switch or selection of the "3" position.
Electronic Pinion Factor
A pinion factor is stored in the TCM in order to provide the appropriate distance pulses for a vehicle. The pinion factor is programmed into the TCM at
the factory on new vehicles. If a TCM is replaced, the electronic pinion factor must be programmed with the DRB Scan Tool.
The nature of the Electronic Pinion Factor requires that certain features must be taken into consideration:
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If no pinion factor is stored in an installed TCM, the vehicle speedometer will not indicate speed when moving
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Selecting the wrong final drive ratio or tire size may cause the speedometer accuracy to fall out of specification
Use the following procedures to set the electronic pinion factor using the DRB Scan Tool:
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Select "Transmission" system, then -"Miscellaneous" functions, then "Pinion Factor". The DRB will display the current tire size.
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If the tire size is incorrect, depress the Enter key and then select the correct size.
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Depress the Page Back key to exit the reset procedure.
Shifter/Ignition Interlock
The Shifter/Ignition Interlock is a mechanically cable operated system that interconnects the automatic transmission floor mounted, or column, shifter to
the steering column ignition switch. The interlock system locks the floor mounted shift lever into the PARK position whenever the ignition switch is in
the LOCK or ACCESSORY position. When the key is in the OFF or RUN position, the shifter is unlocked and will move into any position. The
interlock system also prevents the ignition switch from being turned to the LOCK or ACCESSORY position unless the shifter is in the PARK position.
Shift Position Indicator
The shifter position indicator is located in the instrument cluster. The shifter position indicator outlines with a box the gear position the transaxle manual
valve lever is in.
The Transmission Range Sensor, or PRNDL/Park Neutral combination, sends a signal to the TCM on the position of the transaxle manual valve lever.
The TCM receives the switch signal and processes the data. The TCM sends the Shift Lever Position (SLP) information to the BCM over the CCD Bus.
The BCM then outlines the appropriate shifter position indicator in the instrument cluster.
Autostick
Autostick is a driver-interactive transaxle feature that offers manual gear shifting capability. When the shifter is moved into the Autostick position, the
transaxle remains in whatever gear it was using before Autostick was activated. Moving the shifter to the left (towards the driver) causes a downshift, and
moving it to the right (towards the passenger) causes an upshift. The instrument cluster will illuminate the selected gear. The vehicle can be launched in
1st, 2nd or 3rd gear while in the Autostick mode. Speed control will be deactivated if the transaxle is shifted to 2nd gear. Shifting into OD position
cancels the Autostick mode, and the transaxle resumes the OD shift schedule.
