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.
2001 Chevrolet MetroFACTORY OEM SERVICE PROCEDURE
Powertrain Control Module Diagnostic System Check
NOTE:
Check for applicable Technical Service Bulletins (TSBs) before proceeding. DO NOT perform the following procedure if driveability conditions are not present. DO NOT turn ignition off during the following procedure or clear DTCs unless instructed to do so.
- Check if MIL stays on when engine is running. Check for engine performance or driveability problem. Check if a suspected fault in a PCM controlled component or a PCM controlled system. If a problem is found, go to next step. If no problem is found, system is okay.
- Turn ignition switch to RUN position. Observe MIL. If MIL is illuminated, go to next step. If MIL is not illuminated, diagnose MIL indicator. See SELF-DIAGNOSTICS - 1.3L METRO article in ENGINE PERFORMANCE.
- Turn ignition switch to LOCK position. Install scan tool. Turn ignition switch to RUN position. If scan tool displays any PCM data, go to next step. If scan tool does not display any PCM data, diagnose Data Link Connector (DLC). See SELF-DIAGNOSTICS - 1.3L METRO article in ENGINE PERFORMANCE.
- Start engine. If engine starts and runs, go to next step. If engine does not start or starts but will not run, go to ENGINE CRANKS BUT DOES NOT RUN under NO-START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES article in ENGINE PERFORMANCE.
- Observe DTC data. Save any DTC, any FREEZE FRAME/FAILURE RECORD data. If no DTCs are set, go to next step. If any DTCs are set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
- If MIL is illuminated and no DTCs are set, diagnose MIL indicator. See SELF-DIAGNOSTICS - 1.3L METRO article in ENGINE PERFORMANCE. If MIL is not illuminated and no DTCs are set, go to next step.
- Compare scan tool data display with values shown in appropriate PID VALUE table in appropriate PID VALUE CHARTS article. If displayed values are normal or within the typical values range, problem is intermittent. See INTERMITTENTS in appropriate TROUBLE SHOOTING - NO CODES article in ENGINE PERFORMANCE. If displayed values are not within specified ranges, diagnose suspect components. See appropriate SYSTEM & COMPONENT TESTING article in ENGINE PERFORMANCE.
Factory Service Tools
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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.