SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 8 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 5.7L)SELF-DIAGNOSTIC SYSTEMON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECKCORVETTE
2001 Chevrolet Cavalier LS, 2.4 T

On-Board Diagnostic (OBD) System Check: Corvette

2001 Chevrolet Cavalier LS, 2.4 TSECTION Corvette
WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Check for applicable Technical Service Bulletins (TSBs) before proceeding. DO NOT turn ignition off during the following procedure unless instructed to do so.
  1. Connect scan tool. Turn ignition on, with engine off. If scan tool powers up, go to next step. If scan tool does not power up, go to DLC DIAGNOSIS OR NO SCAN TOOL DATA .
  2. If scan tool displays PCM data, go to step  4. If scan tool does not display PCM data, go to next step.
  3. Using scan tool, select DIAGNOSTIC CIRCUIT CHECK and CLASS 2 MESSAGE MONITOR. If scan tool indicates any other modules as ACTIVE, go to DLC DIAGNOSIS OR NO SCAN TOOL DATA . If scan tool does not indicate any other modules as ACTIVE, check scan tool connection. Check circuits between DLC and control module which does not communicate with scan tool. See WIRING DIAGRAMS article. Repair as necessary.
  4. Attempt to start engine. If engine starts and continues to run, go to step  6. If engine does not start or starts and then stalls, go to next step.
  5. Using scan tool, check for DTCs. If DTC P1626 or P1631 is present, diagnose using appropriate test for DTC P1626 or P1631. See DIAGNOSTIC TESTS . If no DTCs are present, go to NO START DIAGNOSIS in appropriate BASIC DIAGNOSTIC PROCEDURES article.
  6. Using scan tool, monitor COLUMN LOCK parameters: FUEL DISABLE-BCM DTC, PCM-BCM COM and FUEL DISABLE-ABS DTC. If any of the listed parameters indicate a problem with column lock system, diagnose body control system and/or anti-lock brake system. If no problem is indicated, go to next step.
  7. Using scan tool, observe DTC status for MIL REQUEST, FAIL THIS IGN, LAST TEST FAIL and HISTORY. If any DTC is stored, save freeze frame and failure records information using scan tool CAPTURE INFO feature. Diagnose DTCs. See DIAGNOSTIC TESTS . If DTCs are not present, go to next step.
  8. Compare scan tool engine data with typical control system data values. If data values are within limits, see appropriate TROUBLE SHOOTING - NO CODES article. If data values are not within limits, see appropriate SYSTEM & COMPONENT TESTING article.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.