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Home >> Chevrolet >> 1998 >> Monte Carlo LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Controls - Tests W/Codes - 3.8L) >> Diagnostic Trouble Codes >> DTC P1676 - EVAP Canister Purge Solenoid Valve Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

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  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Using a DVOM, check voltage between engine ground and PCM harness connector EVAP purge valve control circuit. If battery voltage is present, go to next step. If battery voltage is not present, go to step 6).
  3. Using DVOM in 10 amp scale, check current between engine ground and EVAP vent solenoid driver circuit for 2 minutes. If current remains between .05-0.50 amp, go to step 11). If current does not remain between .05-.50 amp, go to next step.
  4. Turn ignition off. Leave PCM connector disconnected. Disconnect EVAP purge valve connector. Using DVOM, check voltage between engine ground and EVAP purge valve control circuit. If voltage reading is zero volts, go to step 10). If voltage is not zero volts, go to next step.
  5. Locate and repair short to voltage in EVAP purge valve control circuit. After repairs, go to step 16).
  6. Check ignition feed fuse to EVAP purge valve. If fuse is blown, go to next step. If fuse is okay, go to step 8).
  7. Locate and repair short to ground in EVAP purge valve ignition feed circuit. Replace fuse. After repairs, go to step 16).
  8. Disconnect EVAP purge valve connector. Turn ignition on. Check voltage between engine ground and EVAP purge valve ignition feed circuit. If battery voltage is present, go to next step. If battery voltage is not present, go to step 13).
  9. Check EVAP purge valve control circuit for open or short to ground. Repair as necessary. After repairs, go to step 16). If circuit is okay, go to next step.
  10. Check EVAP purge valve control circuit and ignition feed circuits for faulty connection at EVAP purge valve and PCM. Repair as necessary. After repairs, go to step 16). If connection is okay, go to step 14).
  11. Turn ignition off. Reconnect PCM connector. Disconnect EVAP purge valve connector. Turn ignition on. Connect a test light between EVAP purge valve control circuit and ignition feed circuit at EVAP purge valve harness connector. Using scan tool, cycle EVAP purge solenoid on and off. If test light flashes on and off, see DIAGNOSTIC AIDS. If test light does not flash on and off, go to next step.
  12. Check EVAP purge valve control circuit for faulty connection at PCM. Repair as necessary. After repairs, go to step 16). If connection is okay, go to step 15).
  13. Locate and repair open in EVAP purge valve ignition feed circuit. After repairs, go to step 16).
  14. Replace EVAP purge valve. After replacing EVAP purge valve, go to step 16).
  15. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  16. Using scan tool, read and record FAIL RECORDS DATA, and clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, select SPECIFIC DTC INFO for this DTC. If scan tool displays that this DTC FAILED THIS IGN, return to step 2). If scan tool does not display that this DTC FAILED THIS IGN, repair is complete.
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