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Okay. I will attach a picture of them. Another question in regards to the bulletin. If I replace the PROM, would there be a revised PROM with a different code?
Yes, you should get a new prom with an updated calibration, yours is probably an old revision
1987 Chevy / GMC R1500 R10 5.0L Engine with 700R4 Automatic Transmission
ADTR 1987 31679 16073430 1227747 3432 3341 R1 L03 5.0 MD8 AUTO
this sounds like it may be updated
GMC NUMBER: 91-6D-113
GROUP: 6D Engine Electrical
DATE: July, 1991
CORPORATE NUMBER: 176502R
SUBJECT:
DAMAGE TO ECM/PCM CIRCUIT BOARD WHEN INSTALLING A MEM-CAL (NEW MEM-CAL INSTALL PROCEDURE)
MODELS:
ALL 1986-91 TRUCKS WITH MEM-CAL
CONDITION: When installing a service replacement ECM/PCM, the use of incorrect MEM-CAL installation procedures may cause the ECM/PCM to
fail before it can be installed in the vehicle. This condition may appear as if the ECM/PCM were defective when it was shipped to the dealership, when
in fact it was damaged while being installed. In addition, this condition may also occur when installing an "updated" service MEM-CAL into the
vehicle's original equipment ECM/PCM.
CAUSE: Excessive vertical force may be applied to the MEM-CAL resulting in flexing of the circuit board and damage to the connections between the
circuit board and attached components. Excessive verticle force may be generated in two ways.
1.
Incorrect MEM-CAL installation procedure.
2.
Interference between MEM-CAL and cover.
CORRECTION:
Use the following service procedure.
Service Procedure:
! Important
This procedure supersedes any instructions regarding MEM-CAL installation dated prior to September 1990.
1.
Inspect the MEM-CAL to determine if a cork spacer is glued to the top side of the MEM-CAL assembly. If so, remove it prior to installation.
2.
Align small notches with matching notches in the ECM/PCM MEM-CAL socket.
3.
VERY GENTLY press down on the ends of the MEM-CAL until the locking levers are rotated toward the sides of the MEM-CAL. While
continuing light pressure on the ends of MEM-CAL, use your index fingers to press the locking levers inward until they are snapped into place.
Listen for click.
Notice: To avoid ECM/PCM damage, do not press on the ends of the MEM-CAL until the levers snap into place. Do not use any vertical force
beyond the minimum required to engage the MEM-CAL into its socket.
4.
Install MEM-CAL cover and install ECM/PCM in vehicle
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The Electronic Control Module (ECM), located in the passenger compartment, is the control center of the fuel injection system. The ECM continually
monitors and processes the input information and generates output commands to the various systems affecting vehicle performance.
A removable calibration unit (PROM) enables the ECM to recognize and adjust for vehicle variations (vehicle weight, axle ratio, etc.). There are specific
ECM/PROM combinations for each specific vehicle which are not interchangeable,
Fig. 4.
On V6 models, a CALPAK is also installed in the ECM. The CALPAK allows fuel delivery in the case that other parts of the ECM are damaged, Fig. 5.
possibly wrong ecm?
my car didnt have a calpak spot, but its 1990
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The ECM also performs the diagnostic function of the fuel injection system. When the ECM senses an operational problem, it will illuminate the "Check
Engine" or "Service Engine Soon" light and store the appropriate code(s) to identify the problem area
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Incorrect
PROM or
MEMCAL removal and replacement can create solder joint problems or aggravate an existing condition. See
PROM or
MEMCAL INSTALLATION for proper procedures.
If a solder joint problem results in a "hard" failure, normal test procedures will usually pinpoint a faulty control module. Many symptoms caused by poor
solder joints in the control module result in intermittent problems, but they may be hard to duplicate during troubleshooting. Control module's with
solder joint problems are sensitive to heat and vibration. You can check for these internal control module problems in either, or both, of the following
ways:
^
Remove the control module from its mounting bracket and extend it on the harness so that you can expose it to the vehicle heater ducts.
Alternatively, use flexible ducting to route air from the heater to the control module location. Then run the engine and operate the heater at
the "MAX HEAT" position. This exposes the control module to approximately 140°F.
^
With the engine running, tap on the control module several times with your hand or finger tips to simulate vehicle vibration.
If the engine stumbles or stalls, the "CHECK ENGINE" "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR" light flashes, or any of the
previous symptoms occur, the control module may have bad solder joints on the circuit board
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