Caravan AWD V6-201 3.3L (1991)
continually updated and retained in memory for 20 minutes after the Ignition Switch is turned OFF. On vehicles equipped with a BCM, the calculated
temperature is retained for four hours. When the vehicle is started after an extended OFF time, the calculated fluid temperature is reinitialized at a value
between the battery temperature and engine coolant temperature signals received from the PCM over the CCD Bus.
The oil temperature is calculated on all 1996 MY 41TE transmissions with the TRS. The temperature sensor is part of the TRS. On all 1989 - 95 MY
(and early production 1996 NS, non-TRS,1996 MY with code 74 present), the transmission oil temperature is calculated through a heat transfer equation
that uses engine coolant temperature, battery/ambient temperature and extended time off (if known) at start up.
Transmission Shift Scheduling
Once the engine is started, the TCM updates the transmission oil temperature based on the following to determine an estimated oil temperature during
vehicle operation (if a calculated oil temperature is being used):
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Torque converter slip speed
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Vehicle speed
-
Engine coolant temperature
-
Battery/ambient temperature
Vehicles with "calculated oil temperature" track oil temperature reasonably accurate during normal operation. However, if a transmission oil cooler is
added, a transmission is overfilled, a transmission oil cooler becomes restricted or if a customer drives aggressively in low gear, the calculated oil
temperature will be inaccurate. Consequently, the shift schedule selected may be inappropriate for the current conditions.
The key highlights of the various shift schedules are as follows:
Extreme Cold: Oil temperature at start up below -16° F.
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Goes to "Cold" schedule above - 12°F oil temperature
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Park, Reverse, Neutral and 2nd gear only (prevents shifting which may fail a clutch with frequent shifts)
Cold: Oil temperature at start up above - 12 ° F and below 36°F
-
Goes to "Warm" schedule above 40° F oil temperature
-
Delayed 2-3 upshift (approximately 22 - 31 MPH)
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Delayed 3-4 upshift (45 - 53 MPH)
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Early 4-3 coastdown shift (approximately 30 MPH)
-
Early 3-2 coastdown shift (approximately 17 MPH)
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High speed 4-2, 3-2, 2-1 kickdown shifts are prevented
-
No EMCC
Warm: Oil temperature at start up above 36° F and below 80° F
-
Goes to "Hot" schedule above 80°F oil temperature
-
Normal operation (upshift, kick-downs and coast-downs)
-
No EMCC
Hot: Oil temperature at start up above 80° F
-
Goes to "Overheat" schedule above 240° F oil temperature (250° F for 96 and prior MY)
-
Normal operation (upshifts, kick-downs and coast-downs)
-
Full EMCC, no PEMCC except to engage FEMCC (Except at closed throttle at speeds above 70 - 83 MPH)
Overheat: 96 and prior MY - Oil temperature above 250° F or engine coolant above 230°F
-
Goes to "Hot" below 240° F oil temperature or "Super Overheat" above 260° F oil temperature
-
Delayed 2-3 upshift (25 - 32 MPH) Delayed 3-4 upshift (41 - 48 MPH) 3rd gear FEMCC from 30 - 48 MPH 3rd gear PEMCC from 27 - 31 MPH
97 MY - Oil temperature above 240° F or engine coolant temperature above 244° F
-
Goes to "Hot" below 230° F oil temperature or "Super Overheat" above 240° F oil temperature
-
Delayed 2-3 upshift (25 - 32 MPH)
-
Delayed 3-4 upshift (41 - 48 MPH)
-
3rd gear FEMCC from 30 - 48 MPH
-
3rd gear PEMCC from 27 - 31 MPH
Super Overheat: 97 MY - Oil temperature above 240°F
-
Goes back to "Overheat" below 240 ° F oil temperature
-
All "Overheat" shift schedules features apply 2nd gear PEMCC above 22 MPH
-
Above 22 MPH the torque converter will not unlock unless the throttle is closed (i.e. at 50 MPH a 4th FEMCC to 3rd FEMCC shift will be made
during a part throttle kickdown or a 4th FEMCC to 2nd PEMCC shift will be made at wide open throttle) or if a wide open throttle 2nd PEMCC to
1 kickdown is made.
96 and prior MY - Oil temperature above 260°F
-
Goes back to "Overheat" below 260 ° F oil temperature
