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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0449: EVAP Canister Vent Solenoid Valve Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

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.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Warm engine to normal operating temperature. Operate engine at idle. Using scan tool, command solenoid on and off. If solenoid turns on and off as commanded, go to next step. If solenoid does not turn on or off when commanded, go to step  5.
  3. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Using DVOM, set DVOM to 10-amp scale. Check current from solenoid control circuit in PCM harness connector to ground for 2 minutes. If current draw is less than 0.75 amp (but not zero), see DIAGNOSTIC AIDS . If current draw is not less than 0.75 amp, go to next step.
  4. Turn ignition off. Disconnect solenoid connector. Using DVOM, check resistance from solenoid control circuit in PCM harness connector and ground. If resistance is infinite, go to step  12. If resistance is not infinite, go to step  10.
  5. Turn ignition off. Disconnect solenoid connector. Connect test light between solenoid harness connectors. Turn ignition on. Using scan tool, command solenoid on and off. If test light turns on and off with each command, go to step  8. If test light does not turn on and off with each command, go to next step.
  6. Connect test light ground and probe ignition feed circuit in solenoid harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  11.
  7. Turn ignition off. Reconnect solenoid harness connector. Disconnect PCM harness connector. Turn ignition on. Connect a fused jumper wire between ground and PCM harness connector, solenoid control circuit. If solenoid operates, go to step  9. If solenoid does not operate when energized, go to step  10.
  8. Check connections at solenoid. Repair as necessary. After repairs, go to step  14. If connections are okay, go to step  12.
  9. Check connections at PCM. Repair as necessary. After repairs, go to step  14. If connections are okay, go to step  13.
  10. Repair faulty solenoid control circuit. After repairs, go to step  14.
  11. Repair faulty solenoid ignition feed circuit. After repairs, go to step  14.
  12. Replace solenoid. After replacing solenoid, go to step  14.
  13. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  14. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTCs are displayed, system is okay.
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