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Home >> Pontiac >> 1996 >> Trans Sport >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1655 - EVAP Purge Solenoid Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform 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 connectors. Turn ignition on. Using a DVOM, check voltage between engine ground and PCM harness connector EVAP purge solenoid driver circuit. If voltage is 9-16 volts, go to next step. If voltage is not 9-16 volts, go to step 6).
  3. Using DVOM in 10 amp scale, check current between engine ground and EVAP purge solenoid driver circuit for 2 minutes. If current remains 0.1-1.5 amps, go to step 11). If current does not remain as specified, go to next step.
  4. Ignition off. With PCM connectors disconnected, disconnect EVAP purge solenoid connector. Ignition on. Using DVOM, check voltage between engine ground and EVAP purge solenoid driver circuit. If voltage reading is zero volts, go to step 10). If voltage reading is greater than zero volts, go to next step.
  5. Locate and repair short to voltage in EVAP purge solenoid driver circuit, and go to step 16).
  6. Check EVAP purge solenoid ignition feed fuse. 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 solenoid ignition feed circuit. Replace fuse and go to step 16).
  8. Disconnect EVAP purge solenoid connector. Turn ignition on. Check voltage between engine ground and EVAP purge solenoid ignition feed circuit. If voltage is 9-16 volts, go to next step. If voltage is not as specified, go to step 13).
  9. Check EVAP purge solenoid driver circuit for open or short to ground. If a problem is found, repair as necessary and go to step 16). If no problem is found, go to next step.
  10. Check EVAP purge solenoid driver and ignition feed circuits for faulty connection at EVAP purge solenoid and PCM. If faulty connection is found, repair as necessary and go to step 16). If connection is okay, go to step 14).
  11. Turn ignition off. Reconnect PCM connectors. Disconnect EVAP purge solenoid connector. Turn ignition on. Connect a test light between EVAP purge solenoid harness connector EVAP purge solenoid driver and ignition feed circuits. 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 solenoid driver circuit for faulty connection at PCM. If faulty connection is found, repair as necessary and go to step 16). If connection is okay, go to step 15).
  13. Locate and repair open EVAP purge solenoid ignition feed circuit, and go to step 16).
  14. Replace EVAP purge solenoid and go to step 16).
  15. Replace PCM. Program replacement PCM using required equipment. After repair is completed, 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 DTC P1655. If scan tool displays DTC P1655 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P1655 FAILED THIS IGN, repair is complete.
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