Engine - Dieseling/MIL ON/False Code 53 Set
Bulletin 84-6E-15Date May '84
Ref. No. 84-149-6E
SUBJECT: PROM CHANGE FOR DIESELING & FALSE CODE 53
MODELS AFFECTED: 1984 3.L CENTURYS WITH 125C TRANSMISSION (VIN CODE E)
A few 1984 Centurys with VIN's lower than ED438182 produced at Doraville and E6471905 at Oklahoma City Plants were produced with a PROM calibration that could possibly have the following conditions:
^ Engine diesels after ignition is turned off.
^ Service engine soon light on with code 53.
^ Deceleration periods of longer than 10 seconds will in some cases set a false code 53.
If a code 53 is stored in memory and use of trouble code chart 53 indicates no problem found, or the condition no longer exists, the VIN should be checked and if it is below the breakpoints listed above, a new PROM listed below should be ordered from WDDGM in the normal manner and installed.
NEW PROM BROADCAST CODE REPLACES
Federal 16042776 DPY 16037602
California 16042782 DPZ 16037607