Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1994ASTRO VAN M V6-262 4.3L VIN ZREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSKNOCK SENSORTECHNICAL SERVICE BULLETINSKNOCK SENSOR CIRCUIT - DTC 43 CHART REVISION
1994 Chevrolet Astro Van M V6-262 4.3L VIN Z
Knock Sensor Circuit - DTC 43 Chart Revision
1994 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION 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
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
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.