DeVille V8-4.9L VIN B (1995)
a.
Always touch a known good ground before handling these components. This should be repeated while handling the part and more frequently
after sliding across a seat, sifting down from a standing position or walking a distance.
b.
Avoid touching the electrical terminals of the part unless instructed to do so by a written diagnostic procedure.
c.
Do not remove a part from its protective package until it is time to install it.
d.
Before removing the part from its package, ground the package to a known good ground on the vehicle.
Mem-Cal/Prom Removal
Before proceeding to step 3, determine the AM and FM radio station which have been per-set by the customer. Write them on the repair order. The
battery electrical disconnect will result in loss of both clock time and all pre-set radio stations. Resetting the clock to the correct time and the radio to the
customer's preferred stations before returning the vehicle is a courtesy which will be sincerely appreciated.
3.
Turn ignition key to "OFF" position and disconnect the negative battery cable.
4.
Remove right hush panel.
5.
Remove the three (3) electrical connectors to PCM.
6.
Remove PCM retaining nut.
7.
Pull PCM rearward to disengage the top mounting pins and remove the PCM from the passenger compartment.
8.
Remove Mem-Cal access cover from the PCM and remove Mem-Cal. When removing the Mem-Cal use two fingers and push both retaining clips
from the Mem-Cal at the same time. Grasp the Mem-Cal at both ends and lift from the Mem-Cal socket.
Mem-Cal Installation
9.
Align the notches on the Mem-Cal with the notches in the Mem-Cal socket. Gently press on the ends of the Mem-Cal until it is seated in the
socket. Do not press on the middle of the Mem-Cal. Push the clips onto the sides of the Mem-Cal until they snap into place. Listen for the click
from each end.
10.
Install the Mem-Cal access cover onto the PCM.
11.
Place the PCM onto the mounting bracket, slide the PCM forward to engage the top mounting pins and install the PCM retaining nut.
12.
Install the three (3) electrical connectors to the PCM.
13.
Reconnect negative battery cable.
14.
Start the engine. Engine should start and run. Turn engine off.
^
Functionally check the PCM/Mem-Cal by turning the ignition to "RUN" and enter diagnostics as described in Step 1. Code E52 and B552
(1991 model E/K and 1991-1993 model C only ) or Codes P052 HISTORY and 1052 HISTORY (1992-1993 model E/K and 1994-1995
model Ksp only) will appear and must be cleared.
^
Clear code E52 by pressing "OFF" and "HI" simultaneously. Press any ECC panel button to exit diagnostics. If diagnostic Code F32 or B334
or 1034 appears on the display, the Mem-Cal is not fully seated or is malfunctioning. If it is necessary to remove and reinstall the Mem-Cal,
follow the procedures listed in Steps 3 through 14.
^
To clear codes P052 HISTORY and 1052 HISTORY wait until PCM? displays. After PCM? is displayed press "HI". PCM DATA? should
display. If PCM DATA? is not accessible or a NO PCM DATA message is displayed, verify that the PCM contains the correct PROM, that the
PCM connectors are correctly installed, and the PCM fuses in the engine compartment fuse block are present and not blown (see page 8A-20-0
in the appropriate Service Information Manual). Press "LO" four times until PCM CLEAR CODES displays. Press "HI" to clear all PCM
codes. Press "LO" twice to display IPC?. Press "HI" to display IPC DATA? followed by "LO" three times to display IPC CLEAR CODES?.
Press "HI" to clear all IPC codes. Press "DEFOG" to exit diagnostics.
15.
Once engine operation is verified, perform the following TPS/Idle Learn Procedure. Note that in order to perform this procedure the outside
temperature must be above 10 degrees Celsius (50 degrees Fahrenheit) to enable A/C compressor operation and the engine coolant temperature
must be above 80 degrees Celsius (176 degrees Fahrenheit) to insure PCM closed loop operation. Check engine coolant temperature as follows:
A.
All 1991-1993 model C
