Fleetwood V8-252 4.1L VIN 8 FI (1983)
Engine Control Module: All Technical Service Bulletins
ECM Controls - Intermittent Systems Operation
Bulletin No. T
83-61
File In Group
6C
Number
57
Date
April '83
INTERMITTENT ECM OPERATION - 1983 DFI EQUIPPED VEHICLES
Intermittent ECM operation may be experienced on some 1983 DFI-equipped vehicles. This condition may cause the following symptoms, which occur
immediately after the ignition is turned on and remain for the entire ignition cycle.
^
"Service Now" telltale lamp on.
^
Backup fuel operation.
^
Blank fuel data panel display.
^
ISC not controlled by ECM.
^
Diagnostics not usable.
^
No "coolant temperature" telltale bulb check at key on.
^
EGR solenoid chattering at key on, engine off (this condition is normal on 1982 vehicles, but is not always audible).
After this condition occurs, the ECM may operate normally during subsequent ignition cycles, during which there will usually be no trouble codes stored
as a result of this condition. The counter of ignition cycles since the last trouble code will not be reset to 0. (The ECM is designed to clear all stored
codes and reset the counter to 0, after 50 ignition cycles without any malfunction being detected.)
Some of these symptoms may also be caused by a PROM which has a bent pin (leg), or a pin which is not making a solid contact with the socket. Inspect
the PROM pins for damage. If the PROM pins are not damaged, replacement of the ECM is required to correct this condition.
The ECM, rather than the PROM, is the probable cause of the symptoms listed above if all of the symptoms listed above are found.
A design change has been made to both new and remanufactured ECM's to prevent the likelihood of occurrence of this condition. ECM's incorporating
this change are identified in one of the following ways:
FIGURE 1 - Locating First 3 Digits On ECM Siderail
1.
The first three digits of the ECM side rail number contain 082 (see Figure 1),
OR
