Grand Voyager L4-2.4L DOHC (1996)
Fluid Filter - A/T: All Technical Service Bulletins
A/T - Intermittent Powertrain Shudder
NO: 21-13-95 Rev.
GROUP: Transmission
DATE: Sep. 8, 1995
SUBJECT:
Intermittent Powertrain Shudder
NOTE:
This bulletin supersedes Technical Service Bulletin 21-13-95, dated Sep. 1, 1995, which should be removed from your files. The revision corrects a
Labor Operation Number and is highlighted with **asterisks**.
MODELS:
1996 (NS) Town & Country/Caravan/Voyager
1996 (GS) Chrysler Voyager (European Market)
NOTE:
This bulletin applies to vehicles equipped with a 41TE transaxle.
SYMPTOM/CONDITION:
Intermittent powertrain shudder during A/C operation while the transaxle is in 3rd or 4th gear and the Electronically Modulated Convertor Clutch
(EMCC) is fully engaged (torque convertor is locked) or Diagnostic Trouble Code (DTC) 73 (Worn Out/Burnt Transaxle Fluid) is present in the
Transaxle Control Module (TCM).
These vehicles use an EMCC strategy to allow the torque convertor to "cushion" the A/C compressor clutch engagement while in 3rd and 4th gear when
the torque convertor is locked. Transmissions with fluid deterioration from excessive heat exposure or extensive A/C operation in 3rd and 4th gear when
the torque convertor clutch is applied may exhibit a pronounced shudder during A/C compressor clutch engagements.
The TCM will detect this shudder. After 20 consecutive shudder events are detected the TCM will set DTC 73 and disable the EMCC strategy. If EMCC
has been disabled a slight bump may be felt when the A/C compressor clutch engages while running on smooth roads with the torque convertor locked.
After 35 On Board Diagnostics II (OBD II) warm-up cycles (a warm-up cycle is when the engine coolant temperature has risen by at least 40° F since
engine start up and reaches a minimum engine temperature exceeds 160° F), the TCM will re-attempt the EMCC strategy at least once, so a vehicle with
DTC 73 present may experience intermittent powertrain shudder.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRB III) check for the presence of DTC 73 in the TCM. If DTC 73 is found, perform the
Repair Procedure.
If DTC 73 is not present, road test the vehicle while monitoring the in-gear condition of the transaxle with the DRB III and the NC selected (ambient
temperature must be above 45° F for the A/C clutch to cycle).
Verify whether shudder occurs when the transaxle momentarily enters 4th gear partial lock from 4th gear lock or 3rd gear partial lock from 3rd gear lock.
Throttle angles of more than 20 degrees at 60-65 MPH will produce the most noticeable shudder. The vehicle should be evaluated with the transaxle
both cold (transaxle temperature below 100° F) and warm (transaxle temperature above 200° F) while in 4th gear lock. If the shudder condition occurs
and/or the transaxle fluid is discolored, even if a DTC is not present, perform steps 1 and 2 of the Repair Procedure.
PARTS REQUIRED:
AR
4798233
Fluid, Mopar ATF - Type 7176
1
4504048
Package, Oil Filter
AR
4318025
Sealant, RTV
REPAIR PROCEDURE:
This bulletin involves evaluating the vehicle cooling system, changing the transaxle fluid two times and on some vehicles clearing the DTC's from the
TCM.
1.
Evaluate the vehicle cooling system and ensure proper function.
2.
Change the transmission fluid two times using the following procedure:
