A/T - A604 Excessive Upshifting/Downshifting

90chrysler08 Models

1989-90 AA, AC, AG, AJ, AS, & AY Bodies


Subject


A-604 Transmission Excessive Upshifting/ Downshifting


Index


TRANSMISSION

Date

April 9, 1990


No.


21-12-90

(C21-06-0)
P-1042
BODY CODE LEGEND

AA - ACCLAIM/SPIRIT/LEBARON
AC - DYNASTY/NEW YORKER LANDAU/SALON
AG - DAYTONA
AJ - LEBARON COUPE/LEBARON CONVERTIBLE
AS - CARAVAN/GRAND CARAVAN/CARAVAN C/V
VOYAGER/GRAND VOYAGER/TOWN & COUNTRY
AY - IMPERIAL/NEW YORKER FIFTH AVENUE


SYMPTOM/CONDITION

Some owners may complain of a transmission upshift/downshift hunting (3-4 busyness) condition when the vehicle is fully loaded, driving up a grade or into a head wind.

This condition can occur on vehicles equipped with the A-604 controller PN 4557120 or prior (1989) model year A-604 controllers.

A new A-604 controller, PN 4557585, entered production late March 1990. The new controller allows the torque converter to unlock, instead of initiating a 4-3 downshift during slight vehicle torque load changes.

DIAGNOSIS

Check the A-604 controller part number, if the PN is 4557585, this Technical Service Bulletin does not apply.

Connect the DRB II and perform the diagnostic test as outlined in the appropriate Powertrain Diagnostic Procedure Manual.

If no fault codes are present, perform the following repair procedure.

If fault codes are present, they must be corrected and the corrections verified before performing the following repair procedure.
PARTS REQUIRED


1. 1 - Controller PN 4557585


REPAIR PROCEDURE

This repair involves the replacement of the transaxle controller.

1. Disconnect the negative battery cable.

2. Disconnect the 60-way connector from the controller.

3. Remove the controller.

4. Install the new controller PN 4557585 and torque the mounting bolts to 17 inch pounds.

5. Install the 60-way connector to the controller, torque the attachment bolt to 40 inch pounds.

6. Reconnect the negative battery cable.

7. Road test vehicle to verify controller function, check for fault codes and disconnect the DRB II.


POLICY: Reimbursable within the provisions of the warranty.


TIME ALLOWANCE
Labor Operation No. 08-19-05-96 0.6 Hrs.


FAILURE CODE: 58 - Internal Defect