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.
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HOMESERVICE MANUALSPONTIAC1997GRAND PRIX GTP, 4D SEDANREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 3.8LDIAGNOSTIC TROUBLE CODESDTC P1655 - EVAP EMISSION PURGE SOLENOID CONTROL CIRCUITDIAGNOSTIC PROCEDURES
1997 Pontiac Grand Prix GTP, 4D Sedan
Diagnostic Procedures
1997 Pontiac Grand Prix GTP, 4D SedanSECTION Diagnostic Procedures
- Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING - 3.8L article. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing PBD system check, go to next step.
- Turn ignition off. Disconnect PCM harness 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).
- Using DVOM in 10 amp scale, check current between engine ground and EVAP purge solenoid driver circuit for 2 minutes. If current remains .05-0.5 amp, go to step 11). If current does not remain .05-0.5 amp, go to next step.
- Turn ignition off. With PCM connectors still disconnected, disconnect EVAP purge solenoid connector. Turn 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.
- Locate and repair short to voltage in EVAP purge solenoid driver circuit. After repairs, go to step 16).
- Check EVAP purge solenoid ignition feed fuse. If fuse is blown, go to next step. If fuse is okay, go to step 8).
- Locate and repair short to ground in EVAP purge solenoid ignition feed circuit. Replace fuse. After repairs, go to step 16).
- Disconnect EVAP purge solenoid connector. Turn ignition on. Check voltage between engine ground and EVAP purge solenoid ignition feed circuit. If battery voltage is present, go to next step. If battery voltage is not present, go to step 13).
- Check EVAP purge solenoid driver circuit for open or short to ground. If a problem is found, repair as necessary. After repairs, go to step 16). If no problem is found, go to next step.
- 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. After repairs, go to step 16). If connection is okay, go to step 14).
- 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.
- Check EVAP purge solenoid driver circuit for faulty connection at PCM. If faulty connection is found, repair as necessary. After repairs, go to step 16). If connection is okay, go to step 15).
- Locate and repair open EVAP purge solenoid ignition feed circuit. After repairs, go to step 16).
- Replace EVAP purge solenoid. After replacing EVAP purge solenoid, go to step 16).
- Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
- 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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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.