K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
PROM - Programmable Read Only Memory: Technical Service Bulletins
PROM - More Than Normal Black Smoke At Idle
GMC NUMBER:
89-T-71
GROUP:
6E - Engine Emission
DATE:
June, 1989
CORPORATE
NUMBER:
936503R
SUBJECT:
MORE THAN NORMAL BLACK SMOKE AT IDLE
MODELS:
1988 AND EARLY 1989 C/K/R/V/G TRUCKS W/6.2L (VIN C) DIESEL
Comments have, been received of more than normal black smoke at idle on the above mentioned vehicles. To correct this black smoke condition, the
Engine Control Module (ECM) calibration has been modified to enhance the regulation of the Exhaust Gas Recirculation circuit at idle. Listed below are
the replacement PROM's required to service the 1988-89 model vehicles.
Replacement
Broadcast
Scanner
PROM
Code
I.D.
P/N
Model
1988
APYC
Visual
16133376
R/V C/K/G ALL MODELS
Inspection
1989
APXY
3381
16133879
R/V 1 AND MD8
G2 AND MY6
APXZ
3391
16141815
C/K 1, 2 AND M20
C1 AND MD8
APYA
3401
16133888
C2 AND MD8
K1, 2 AND MD8 G2 AND MD8
Parts are currently available from GMSPO. 1988 vehicles require visual inspection of the PROM Broadcast label for ECM identification (I.D.). Tech I
Scan tool may be used to identify ECM calibration on 1989 vehicles. Current service procedure for PROM replacement should be used.
Labor Operation Number:
T0500
Labor Time:
.6 Hr
