A/T - Revised Wiring Harnesses and Pressure Switches
90oldsmobile04SUBJECT NEW WIRING HARNESSES AND PRESSURE
SWITCHES
MODELS/YEARS 1990 CUTLASS CIERA, CUTLASS SUPREME, EIGHTY-
EIGHT, NINETY-EIGHT, TORONADO EQUIPPED WITH
HYDRA-MATIC 4T60 (THM440-T4) TRANSAXLE (RPO-
ME9)
NUMBER: 90-T-54
CORP.REF.NO: 977156
DATE: March 1990
SECTION: 7B
Figure 1 - Wiring Diagram:
Figure 2 - Wiring Diagram:
BULLETIN COVERS:
The 2nd, 3rd and 4th clutch circuit pressure switches will have "button-headed" wire connectors instead of blade type connectors for easier assembly at the transaxle assembly plant and to reduce the chance of the connectors working loose. This change also requires new wiring harnesses. (See Figures 1, and 2).
DATE OF PRODUCTION CHANGE:
Starting September 6, 1989 (Julian Date 249) some HYDRA-MATIC 4T60 (THM 440-T4) transaxles built using the new pressure switches and wiring harnesses. Beginning in early November, 1989, all models have the new pressure switches and wiring harnesses.
SERVICE PARTS INFORMATION:
Listed below are the service part numbers for the new pressure switches and wiring harnesses.
The new pressure switches and wiring harnesses are available for service.