Premier L4-150 2.5L (1988)
Powertrain Control Module: All Technical Service Bulletins
A/T - Harsh Closed Throttle 4-3 Downshift
Models
1988-89 BB Vehicles Built Before 02-20-89 With ZF Automatic Transaxle
Subject
Harsh 4-3 Closed Throttle Downshift Excessive Closed Throttle Harshness In Third Gear
Index
TRANSMISSION
Date
August 7, 1989
No.
21-59-89
(C21-14-9)
P-2975
BODY CODE LEGEND
BB - EAGLE PREMIER
SYMPTOM/CONDITION
Some 1988-89 vehicles equipped with the ZF transaxle may exhibit one or both of the following conditions.
-
Harsh 4-3 closed throttle down shift on vehicles built before 01-13-89 with ZF Automatic Transaxles built before transaxle sequence number
72018.
-
Tip out harshness and excessive engine braking during closed throttle deceleration in third gear on vehicles built before 02-20-89 (MDH
02-20-XX).
DIAGNOSIS
Road test vehicle observing the transmission shift quality. Early shifts, slipping between shifts, delayed shifts and sensitive downshifts indicate an
incorrectly adjusted throttle cable. Adjust the transmission throttle valve cable as outlined on Page 21-23 in the 1989 Premier Service Manual
(81-270-9040).
If the shift quality is found to be normal EXCEPT for a harsh 4-3 closed throttle downshift and/or tip out harshness and excessive engine braking during
closed throttle deceleration in third gear, perform the following repair procedure as required.
PARTS REQUIRED
1
Valve Body Assembly
P/N 04549231
1
Gasket (Oil Pan)
P/N 83504677
1
Engine Control Unit
P/N 05234642
REPAIR PROCEDURE
This repair involves replacement of the valve body assembly and/or engine control unit.
1.
Check the vehicle build date. If the MDH is before 01-13-XX, perform step 2 through step 28. If the built MDH is 01-13-XX to 02-20-XX,
perform step 2 through 6.
2.
Raise hood and disconnect the negative battery cable.
3.
Remove the ECU mounting nuts and ground strap, (the ECU is located under the instrument panel on the passenger side of the vehicle) remove the
ECU from the vehicle. (Figure 1)
