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HOMESERVICE MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 3.1LDIAGNOSTIC TROUBLE CODESDTC P1662 - CRUISE CONTROL INHIBIT 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 cruise inhibit driver circuit terminal 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 cruise inhibit driver circuit terminal at PCM connector. Monitor reading for a minimum of 2 minutes. If current is .5 amp, go to step 11). If current is not .5 amp, go to next step.
  4. Disconnect Stepper Motor Cruise Control (SMCC) module connector. Using DVOM, check voltage between ground and cruise inhibit driver circuit at cruise inhibit 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 cruise inhibit driver circuit. After repairs, go to step 16).
  6. Remove and inspect fuse for SMCC module. 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 SMCC module. Replace fuse. After repair is completed, go to step 16).
  8. Disconnect SMCC module. Turn ignition on. Check voltage between ground and ignition feed circuit terminal at SMCC module 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 cruise inhibit driver circuit. Repair as necessary. After repairs, go to step 16). If circuit is okay, go to next step.
  10. Check cruise inhibit driver circuit and ignition feed circuit for poor terminal connection at SMCC module connector 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 connector. Disconnect SMCC module connector. Turn ignition on. Connect a test light between cruise inhibit driver circuit and ignition feed circuit terminals at SMCC module harness connector. Using scan tool, select OUTPUTS TEST function and cycle cruise inhibit on and off. If test light flashes, see DIAGNOSTIC AIDS. If test light does not flash, go to next step.
  12. Check cruise inhibit driver 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 SMCC module. After repairs, go to step 16).
  14. Replace SMCC module. After replacing module, 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 DTC P1655 until DTC P1655 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.