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 MANUALSCHEVROLET1998EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIRPASSWORD LEARN PROCEDUREUSING A TECH 2 SCAN TOOL
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Using A Tech 2 Scan Tool
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Using A Tech 2 Scan Tool
IMPORTANT: Refer to DTC P1631 Theft Deterrent Password Incorrect if the Passlock Learn Procedure cannot be completed successfully. Testing and Inspection
IMPORTANT: Performing the following procedures will cause a DTC P1630 to set when they are completed. This is the intended functionality. Once it is set, turn the ignition OFF for 30 seconds, then turn the ignition ON and P1630 will clear. If P1630 does not clear, go to DTC P163O Theft Deterrent VCM in Learn Mode. Testing and Inspection
PROCEDURE
1. Using a Tech 2 enter the Service Programming System (SPS).
2. After entering the vehicle information, choose the Request Info soft key on the Tech 2.
3. Select Done and follow the instructions on the Vehicle Set-up screen
4. Disconnect the Tech 2 from the vehicle and connect the Tech 2 to a Techline terminal.
5. At the Techline terminal, select Service Programming System (SPS), select the Terminal to Scan Tool Programming method and then select Done.
6. Follow the instructions on the remaining screens.
7. Select Vehicle Theft Re-learn.
8. Select Program at the summary screen. The terminal will download the information to the Tech 2.
9. Return the Tech 2 to the vehicle and connect the Tech 2 to the Diagnostic Link Connector (DLC).
10. Select Service Programming from the Tech 2 main menu. Answer the prompts regarding the model year and vehicle type. Press the Theft Re-learn soft key on the Tech 2.
11. Follow the instructions on the remaining screens.
^ The VCM and the Passlock control module will prepare for re-learn.
^ A security timer will be on for approximately 10 minutes or until DTC P1630 sets.
^ When the VCM and the Passlock control module are prepared to re-learn, turn the ignition OFF for 30 seconds and then start the engine.
IMPORTANT: Performing the following procedures will cause a DTC P1630 to set when they are completed. This is the intended functionality. Once it is set, turn the ignition OFF for 30 seconds, then turn the ignition ON and P1630 will clear. If P1630 does not clear, go to DTC P163O Theft Deterrent VCM in Learn Mode. Testing and Inspection
PROCEDURE
1. Using a Tech 2 enter the Service Programming System (SPS).
2. After entering the vehicle information, choose the Request Info soft key on the Tech 2.
3. Select Done and follow the instructions on the Vehicle Set-up screen
4. Disconnect the Tech 2 from the vehicle and connect the Tech 2 to a Techline terminal.
5. At the Techline terminal, select Service Programming System (SPS), select the Terminal to Scan Tool Programming method and then select Done.
6. Follow the instructions on the remaining screens.
7. Select Vehicle Theft Re-learn.
8. Select Program at the summary screen. The terminal will download the information to the Tech 2.
9. Return the Tech 2 to the vehicle and connect the Tech 2 to the Diagnostic Link Connector (DLC).
10. Select Service Programming from the Tech 2 main menu. Answer the prompts regarding the model year and vehicle type. Press the Theft Re-learn soft key on the Tech 2.
11. Follow the instructions on the remaining screens.
^ The VCM and the Passlock control module will prepare for re-learn.
^ A security timer will be on for approximately 10 minutes or until DTC P1630 sets.
^ When the VCM and the Passlock control module are prepared to re-learn, turn the ignition OFF for 30 seconds and then start the engine.
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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.