Pontiac Fiero 1988 Service Manual page 523

6E2-C1-6 DRIVEABILITY A N D EMISSIONS - FUEL INJECTION (TBI)
HI
E C M
1X3
E C M H A R N E S S -
[T]
ECM M N T G . B R A C K E T ^ CONNECTORS T O ECM
DO
C O N S O L E
4 S Q 5 6 4
^
E
Figure C1-7 - ECM Mounting "P" Series - with A/C
ON-CAR SERVICE
E L E C T R O N I C
CONTROL MODULE (ECM)
Service of the ECM should normally consist of
either replacement of the ECM or a PROM change.
If the diagnostic procedures call for the ECM to be
replaced, the engine calibrator (PROM) and ECM
should be checked first to see if they are the correct
parts. If they are, remove the PROM from the faulty
ECM and install it in the new service ECM. THE
SERVICE ECM WILL NOT CONTAIN A PROM.
Trouble Code "51" indicates the PROM is installed
improperly or has malfunctioned.
|"T| Important
When replacing the production ECM with a
service ECM (controller), it is important to
transfer the Broadcast code and production ECM
number to the service ECM label. This will allow
positive identification of ECM parts throughout
the service life of the vehicle.
Important
To prevent internal ECM damage, the ignition
must be " O F F " when disconnecting or
reconnecting power to ECM (for example, battery
cable, ECM pigtail, ECM fuse, jumper cables, etc.).
ECM AND COMPONENTS REPLACEMENT
Remove or Disconnect
1. Negative battery cable.
2. Console cover.
3. Connectors to ECM.
4. ECM mounting hardware (Figure Cl-7).
E X 3 y
t
j
rn
E C M
nn
P R O M
m
A C C E S S C O V E R
7 S 3 3 2 7 - 6 E
Figure C1-8 - ECM PROM Access Cover
Figure C1-9 - PROM Removal Tool
5. ECM.
6. PROM from ECM. See PROM procedure.
7. New ECM from its packaging and check the
service number to make sure it is the same as the
defective ECM.
j j j Important
Replacement ECM is supplied without a PROM, so
care should be used when removing it from the
defective ECM, because it will be reused in the
new ECM.
1
2.
3.
4.
5.
Install or Connect
Old PROM In new ECM.
ECM into vehicle.
Connectors.
Console cover.
Negative battery cable.