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 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESSCAN TOOL DOES NOT POWER UP
2001 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Scan Tool Does Not Power Up
2001 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Scan Tool Does Not Power Up
CIRCUIT DESCRIPTION
The DLC provides battery positive voltage for the scan tool at terminal 16 and ground at terminal 4. The DLC provides the class 2 signal at terminal 2 and signal ground at terminal 5. The scan tool will power up with the ignition OFF.
TEST DESCRIPTION
Step numbers below refer to the same step numbers in the Diagnostic Table.
1. The AUX PWR fuse supplies power to the DLC terminal 16.
4. The DLC battery positive voltage and ground circuits are functioning properly. The malfunction must be due to the scan tool.
The DLC provides battery positive voltage for the scan tool at terminal 16 and ground at terminal 4. The DLC provides the class 2 signal at terminal 2 and signal ground at terminal 5. The scan tool will power up with the ignition OFF.
TEST DESCRIPTION
Steps 1-4:
Step numbers below refer to the same step numbers in the Diagnostic Table.
1. The AUX PWR fuse supplies power to the DLC terminal 16.
4. The DLC battery positive voltage and ground circuits are functioning properly. The malfunction must be due to the scan tool.
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.