Cutlass Supreme FWD V6-189 3.1L (1989)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
PROM - Cold Start or Decel Stall or Tip-in Hesitation
SUBJECT:
DRIVEABILITY CONCERNS - 3.1L V-6 ENGINE DIAGNOSIS AND NEW MEMCALS)
MODELS/YEARS:
1989 CUTLASS SUPREME
NUMBER:
89-T-121
CORP. REF NO.: 936515
DATE:
August 1989
SECTION:
6E
Vehicles Affected:
Beginning VIN KD363140 through KD363859
Some customers may comment that they have experienced one or more of the following conditions:
-
a cold start stall or sag, - a decel stall, or
-
a tip-in hesitation.
These conditions may be attributed to a number of components/inter-actions. In the interest of simplifying diagnosis and repair, the following procedure
has been developed to reduce system sensitivity, thereby addressing a variety of potential causes simultaneously.
If a customer comment concerning an occasional engine stall or a drive hesitation is received, then complete the following procedure:
1.
Perform diagnostic checks, per Section 6E3 of the Service Manual and replace any defective components.
Proceed to Step # 2 only if diagnostic checks uncover no cause for the customer comments.
2.
Check the MEM-CAL scanner I.D. to determine if latest MEM-CAL is installed. If not, proceed to Step # 3. If so, the vehicle must be reinspected
for other possible causes for the problem.
3.
Install a new MEM-CAL into the Engine Control Module (ECM) per instructions below. The new MEM-CAL may be ordered from GMSPO. See
the attached service part number chart.
A )
Pull the under-hood ECM continuous power fuse or disconnect the battery and leave it
disconnected for at least 10 minutes.
B)
Remove current MEM-CAL and install a new service MEM-CAL.
C)
Restore the battery power and place air conditioning controls (if equipped) in the "off" position.
D)
Firmly apply the parking brake and block the drive wheels. Start the engine, and shift the transaxle to "drive" for automatics or "neutral"
for manuals.
E)
Allow the engine to run until the engine cooling fan has cycled once, or a maximum of 10 minutes.
F)
Turn the ignition key to the "off" position for at least 5 seconds.
G)
Start the engine, and shift the transaxle to "drive" for automatics or "neutral" for manuals.
H)
Allow engine to run for at least 5 minutes.
WARRANTY INFORMATION:
Labor Operation Number:
T1506
Labor Time:
.7 Hour
Trouble Code:
92
1989 CUTLASS SUPREME 3.1L ENGINE
MEM-CAL SELECTION CHART - SERVICE PART NUMBERS
BROAD-
MODEL
EMISSION
MEM-CAL
SCANNER
CAST
YEARS
TRANS.
CONFIG.
P/N
I.D.
CODE
