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HOMESERVICE MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 3.1LDIAGNOSTIC TROUBLE CODESDTC P1665 - EVAP VENT SOLENOID CONTROL CIRCUITDIAGNOSTIC PROCEDURES
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4

Diagnostic Procedures

1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Diagnostic Procedures
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  , then go to next step.
  2. Turn ignition off. Disconnect PCM connector. Turn ignition on. Using DVOM, check voltage between ground and EVAP canister vent valve control circuit at PCM connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step 6).
  3. Set ammeter to 10-amp range. Check current between ground and EVAP canister vent valve control circuit at PCM connector. Monitor reading for a minimum of 2 minutes. If current is .1-.8 amp, go to step 11). If current is not .1-.8 amp, go to next step.
  4. Disconnect EVAP canister vent valve connector. Using DVOM, check voltage between ground and EVAP vent valve solenoid control circuit at harness connector. If voltage reading is zero volts, go to step 14). If voltage reading is not zero volts, go to next step.
  5. Locate and repair short to voltage in EVAP canister vent valve control circuit. After repairs, go to step 16).
  6. Turn ignition off. Remove and inspect fuse for EVAP canister vent 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 ignition feed circuit for EVAP canister vent valve. Replace fuse. After repairs, go to step 16).
  8. Disconnect EVAP canister vent valve. Turn ignition on. Check voltage between ground and ignition feed circuit for EVAP canister vent valve harness connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step 13).
  9. Check for an open or short to ground in EVAP canister vent valve control circuit. Repair as necessary. After repairs, go to step 16). If circuit is okay, go to next step.
  10. Check EVAP canister control circuit and ignition feed circuit for poor terminal connection at EVAP canister vent and at PCM connector. Repair as necessary. After repairs, go to step 16). If connections are okay, go to step 14).
  11. Turn ignition off. Reconnect PCM harness connector. Disconnect EVAP canister vent valve connector. Turn ignition on. Connect a test light between EVAP canister vent valve control circuit and ignition feed circuit terminals at EVAP canister vent valve connector. Using scan tool, select OUTPUTS TEST function and cycle EVAP vent solenoid on and off. If test light flashes on and off, see DIAGNOSTIC AIDS. If test light does not flash, go to next step.
  12. Check EVAP canister vent valve control circuit for poor terminal 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 ignition feed circuit to EVAP canister vent valve. After repairs, go to step 16).
  14. Replace EVAP canister vent valve. After replacing vent 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, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for this DTC until this DTC test runs. If scan tool indicates FAILED THIS IGN, repeat step 2). If scan tool does not indicate 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.