Seville V8-273 4.5L (1989)
If the voltage/resistance test indicates there is a problem in part of the 800 circuit, check that section of the 800 circuit by tracing the wire and checking
connections in that segment. Refer to page 8A-50-0 in the Service Information Manual for circuit layout. If the circuit is difficult to trace or no problem
in the circuit is visible, it may be better to restring the segment involved. If this segment includes the flex circuits behind the IPC on E/K models, isolate
the problem to the wiring up to C201 or a C201/flex circuit problem. If the problem is in connector C201 or the flex circuits, the entire carrier must be
replaced.
NOTE:
Data line conditions tend to be intermittent and may disappear while disconnecting/ reconnecting components. Therefore, double check
each step of the trouble tree to make sure the conditions have not disappeared during testing. If they have disappeared, return to the last
step taken while the condition was present and continue when condition returns. If the condition cannot be duplicated again or the
condition present diagnosis does not lead to the fix, perform the condition not present diagnosis.
Condition Not Present:
Sometimes the conditions can be duplicated by carefully warming the data line components with a heat gun and/or lightly tapping on them. If the
condition cannot be duplicated on the vehicle during diagnosis, follow the procedure below:
1.
Make sure that the grounds on the block near the starter solenoid, and on the fender near the battery, are clean and tight. Make certain there are
star washers on the stud and that the studs are free of corrosion. Refer to Service Bulletin T-87-105, Group 8, for 1986-1987 Eldorados and
Sevilles and T-90-55, Group 6E, for 1988-1990 Eldorados, Sevilles, DeVilles, and Fleetwoods.
2.
On 1986 and 1987 Eldorados and Sevilles, make sure the engine-to-dash harness is not damaged and is secured to the brake booster. Refer to
Service Bulletin T-86-35, Group 8.
3.
Check the BCM EPROM and EEPROM and ECM CALPAK and PROM or MEM-CAL assembly for proper insertion into their respective
sockets. Inspect components for bent or damaged legs.
4.
Make sure both BCM and ECM have the correct PROM's for that model year.
5 .
If the source of the intermittent problem has not been found and the intermittent condition
persists:
A.
Verify good connections at the following components. Check each connection for proper latching and pins seated in the connector.
B.
Replace the following components, one at a time, checking for reoccurrence of the intermittent condition after each component replacement.
Follow the order listed. The order listed represents most likely to least likely cause of a multiple communications code condition:
^
BCM
^
ECM
^
BCM EPROM
^
ECM CALPAK or MEM-CAL
^
IPC
^
CCDIC
^
Programmer
^
Central Power Supply (CPS)
^
BCM EEPROM
For warranty purposes refer to the Labor Time Guide.
I/P and CCDIC Displays Flicker or Turn Off and/or Code E047 Set
Bulletin No.
T-89-85
File in Group
8
Number
98
Corp. Ref. No.
9118304
Date
March, 1989
