A/T - 41TE/42LE Cruise Control Interaction
NO: 08-15-95GROUP: Electrical
DATE: Apr. 14, 1995
SUBJECT:
41TE/42LE Transaxle Downshifting/Upshifting While Cruise Control is Engaged (Interactive Cruise Control)
MODELS:
1993-1995 (AA) Spirit/Acclaim/LeBaron Sedan
1993 (AC) Dynasty/New Yorker/New Yorker Salon
1993 (AG) Daytona
1993-1995 (AJ) LeBaron Coupe/LeBaron Convertible
1993-1994 (AP) Shadow/Shadow Convertible/Sundance
1993-1995 (AS) Town & Country/Caravan/Voyager
1993 (AY) Imperial/New Yorker Fifth Avenue
1993-1995 (ES) Chrysler Voyager (European Market)
1995 (FJ) Avenger/Sebring (With 2.5L Engine)
1995 (JA) Cirrus/Stratus
1993-1995 (LH) Concorde/Intrepid/LHS/New Yorker/Vision
1996 (NS) Town & Country/Caravan/Voyager
1996 (GS) Chrysler Voyager (European Market)
NOTE:
THIS BULLETIN APPLIES TO THE LISTED 1993 AND 1994 VEHICLES ONLY IF THEY HAVE HAD THE TRANSMISSION CONTROL MODULE (TCM) FLASHED OR REPLACED PER TECHNICAL SERVICE BULLETIN 18-27-94 REV. A DATED JAN. 30, 1995.
DISCUSSION:
The following is an explanation of how the interactive cruise control effects 41TE and 42LE transaxle operation:
WHEN CLIMBING A GRADE - The cruise control will try to maintain the set speed by increasing the throttle opening. If opening the throttle is not enough to maintain the set speed, the transaxle will downshift to 3rd gear. If the vehicle continues to loose speed, the transaxle will downshift further until a gear that can maintain the set speed is selected. After the vehicle encounters a less steep grade or has crested the grade and can maintain the set speed at a reduced throttle position, the transmission will upshift as appropriate when the set speed can be maintained in Overdrive.
WHEN DESCENDING A GRADE - The cruise control will try to maintain the set speed by reducing or closing the throttle opening. If closing the throttle (A Throttle Position Sensor (TPS) signal of 2 degrees or less is considered closed throttle) is not enough to keep the vehicle within 3 MPH over the set speed, the transaxle will downshift to 3rd gear. The transaxle will not downshift below 3rd gear to try to maintain the set speed.
If the downshift to 3rd gear has taken place, pushing the brake pedal will disengage the cruise control but the transaxle will stay in 3rd gear. The transaxle will upshift to Overdrive when the TCM receives a TPS signal of approximately 5 degrees or more.
If the downshift to 3rd gear has taken place and the cruise control is still engaged, the transaxle will upshift to Overdrive when the TCM receives a TPS signal of approximately 8 degrees or more for approximately 3 seconds or more with the vehicle at the set speed or greater.
NOTE:
1993, 1994 AND 1995 (BUILT ON OR BEFORE 10/24/95, MDH 10-24-XX) LH VEHICLES USE 8 DEGREES TPS SIGNAL. 1995 LH VEHICLES (BUILT AFTER 10/24/95, MDH 10-24-XX) OR ANY LH VEHICLE THAT HAS HAD TECHNICAL SERVICE BULLETIN 18-27-94 REV. A PERFORMED ON IT USES A 3 DEGREES TPS SIGNAL THAT IMPROVES ON/OFF THROTTLE FEEL WHEN THE CRUISE CONTROL ACTIVATES THE THROTTLE OPENING AS THE GRADE FLATTENS OUT.
If the downshift to 3rd gear has taken place and the cruise control is disengaged using the ON/OFF button or the CANCEL button, the transaxle will upshift to Overdrive after an approximate 2 second delay.
POLICY: Information Only