K 1500 Truck 4WD V6-262 4.3L (1991)
Technical Service Bulletin # 91C236E
Date: 910901
Recall - TPS Inspection Replacement
Number: 91C23
Section: 6E
Date: Sept., 1991
Subject:
PRODUCT EMISSION CAMPAIGN 91C23
THROTTLE POSITION SENSOR
Model and Year:
1991 C/K, R/V & P TRUCKS AND G VANS
TO:
ALL CHEVROLET DEALERS
General Motors has determined that certain 1991 Chevrolet C/K, R/V & P trucks and G vans with 4.3L, 5.7L or 7.4L fuel-injected gasoline engines,
coupled with Hydra-Matic 4L80 electronic transmissions (MT1), may have a Throttle Position Sensor (TPS) which exhibits intermittent low output
voltage. This condition may cause the transmissions in these vehicles to have no upshift to 4th gear, no TCC, or harsh transmission shifts.
To correct this condition, dealers are to inspect and, if necessary, replace the TPS switch.
Vehicles Involved, Owner, Dealer, & Parts Info.
VEHICLES INVOLVED
Involved are certain 1991 Chevrolet C/K, R/V & P trucks and G vans with 4.3L, 5.7L or 7.4L fuel-injected gasoline engines, coupled with Hydra-Matic
4L80 electronic transmissions (MT1) built within the following VIN breakpoints:
PLANT
YEAR
MODEL
PLANT
CODE
FROM
THROUGH
1991
C/K
Oshawa
"1"
M1103084
M1215247
"
"
Fort Wayne
"Z"
MZ111026
MZ162490
"
"
Janesville
"J"
MJ100009
MJ109467
"
"
Pont. East
"E"
ME100001
ME189055
"
R/V
Flint
"F"
MF100003
MF137073
"
P30
Detroit
"3"
M3300001
M3310669
"
G
Lordstown
"7"
M7118501
M7127389
"
G
Scarborough
"4"
M4100019
M4133305
VEHICLES INVOLVED (Con't)
Involved vehicles have been identified by Vehicle Identification Number Computer Listings. Computer listings contain the complete Vehicle
Identification Number, owner name and address data, and are furnished to involved dealers with the campaign bulletin. Owner name and address data
furnished will enable dealers to follow-up with owners involved in this campaign.
These listings may contain owner names and addresses obtained from State Motor Vehicle Registration Records. The use of such motor vehicle
registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to the follow-up
necessary to complete this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently
assigned.
OWNER NOTIFICATION
Owners will be notified of this campaign on their vehicles by Chevrolet Motor Division (see copy of owner letter included with this bulletin).
DEALER CAMPAIGN RESPONSIBILITY