C 3500 Truck 2WD V8-379 6.2L DSL (1988)
PROM - Programmable Read Only Memory: Customer Interest
PROM - Excessive Black Smoke at Idle
Number:
89-181-6E
Section:
6E
Date:
June 1989
Subject:
MORE THAN NORMAL BLACK SMOKE AT IDLE
Model and Year:
1988-89 C, K, R, V, G TRUCKS WITH 6.2L (VIN C) DIESEL
TO:
ALL CHEVROLET DEALERS
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.
NEW
Replacement
Broadcast
Scanner
PROM
Code
I.D.
P/N
Model
1988
APYC
Visual
16133376
RN 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 Tlme:
.6 Hours All trucks except G .7 G trucks
