A/T - ECM PROM Compatibility

88cad01
Bulletin No. T-88-68
File in Group 7
Number 178
Corp. Ref. No. 717110
Date Jan. '88
SUBJECT: TRANSAXLE - ECM PROM COMPATIBILITY

MODELS AFFECTED: 1987 ALLANTE


An ECM PROM and transaxle calibration change was made during the 1987 model year on Allantes. The updated calibration changes allow VCC apply in 3rd and 4th gear only.

Since all exchange transmissions are of the update design, an updated PROM (I.D. 545) must be installed if the original PROM I.D. is 543.

Early production and late production ECM, PROM, and transaxles are not compatible with each other. To determine which ECM PROM must be used with each transaxle I.D., use the following chart:

Latest
PROM I.D./ Service PROM
Trans. I.D. Broadcast Code Part Number

Early Prod: 7AAZ 543/AHWY 16077504

Late Prod: 7APZ 544/AKAA 16076500 -or- 545/ADBC

NOTE: Reference Serviceman Bulletin T-87-18A. PROM I.D.'s 544 and 545 are interchangeable and both are compatible only with a second design 7APZ transmission. PROM I.D. 544 is not available as a service part.

For warranty purposes, use Labor Operation J6364 at .5 hour for PROM replacement.