Operation CHARM: Car repair manuals for everyone.
Home >> Chevrolet >> 1993 >> Beretta L4-138 2.3L DOHC QUAD 4 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Knock Sensor >> Technical Service Bulletins >> Engine Controls - Revised OBD System Check, DTC 43 (KS) >> Update Description
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

Update Description


This bulletin updates Section 6E3 of the 1993 1993 "L" body with the 2.3L (VIN A) Engine. The updated pages reprosent engineering changes in the Knock Sensor (KS) System. Included with these pages are enhanced diagnostic charts. The pages are as follows:

1993 Chevrolet "L" body

- A-10 On-board Diagnostic (OBD) System Check, Tech 1 Data
- A-68 DTC 43 Knock Sensor (KS) Circuit Facing Page
- A-69 DTC 43 Knock Sensor (KS) Circuit Chart
- C5-2 Chart C-5 Knock Sensor (KS) System Check Facing Page
- C5-3 Chart C-5 Knock Sensor (KS) System Check

Please update your Service Manuals accordingly.

pro multis · About Operation CHARM