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 MANUALSCHEVROLET2001EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSDESCRIPTION AND OPERATION
2001 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Information Bus: Description and Operation
2001 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Description and Operation
[1][2]DATA LINK COMMUNICATIONS CIRCUIT DESCRIPTION AND OPERATION
The Class 2 serial data link allows modules to transmit, receive, or exchange data.
^ Electronic Brake Control Module (EBCM)
^ Powertrain Control Module (PCM)
^ Radio (IRC)
^ Vehicle Theft Deterrent (VTD)
^ Vehicle Immobilizer Module (VIM)
^ Inflatable Restraint Sensing and Diagnostic Module (SDM)
Circuit Description
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. In addition to this, Node Alive messages are transmitted by each module on the class 2 serial data circuit about once every 2 seconds. When the module detects the class 2 serial data circuit shorted, the setting of all other class 2 serial communication DTCs is inhibited and a U1305 DTC will set.
The Class 2 serial data link allows modules to transmit, receive, or exchange data.
^ Electronic Brake Control Module (EBCM)
^ Powertrain Control Module (PCM)
^ Radio (IRC)
^ Vehicle Theft Deterrent (VTD)
^ Vehicle Immobilizer Module (VIM)
^ Inflatable Restraint Sensing and Diagnostic Module (SDM)
Circuit Description
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. In addition to this, Node Alive messages are transmitted by each module on the class 2 serial data circuit about once every 2 seconds. When the module detects the class 2 serial data circuit shorted, the setting of all other class 2 serial communication DTCs is inhibited and a U1305 DTC will set.
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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.