Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Knock Sensor Circuit - DTC 43 Chart Revision

File In Section: 6E Engine Fuel & Emission

Bulletin No.: 51-65-19

Date: April, 1995

Subject:
Section 3A - Control Module System (PCM) Driveability and Emissions - Revised DTC 43 Knock Sensor (KS) Circuit (Dual Knock Sensors)

Models:
1994 Chevrolet and GMC Truck S/T; M/L, C/K Models with 4.3L Engine (VINs W, Z - RPOs L35, LB4)





This bulletin advises of a revision to the DTC 43 Knock Sensor (KS) Circuit (Dual Knock Sensor System) chart in the following service manuals:

1994 S/T Driveability Emissions and Electrical Diagnosis Manual, page 3A-119

1994 M/L Driveability Emissions and Electrical Diagnosis Manual, page 3A-75

1994 C/K Driveability Emissions and Electrical Diagnosis Manual, page 3A-69