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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1554 - Cruise Control Status Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  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 on. Using scan tool, check DTCs. If DTC P1676 is set, diagnose DTC P1676 first. If DTC P1676 is not set, go to next step.
  3. Turn ignition off. Disconnect cruise control module connector. Turn ignition on. Using a DVOM, check voltage between engine ground and cruise status circuit at cruise control module connector. If voltage is greater than 7 volts, go to next step. If voltage is not greater than 7 volts, go to step 5).
  4. Turn ignition off. Reconnect cruise control module connector. Turn ignition on. Using test light connected to battery voltage, probe cruise control engaged status circuit at PCM connector. If test light illuminates, go to step 6). If test light does not illuminate, go to step 7).
  5. Turn ignition off. Disconnect PCM harness connector. Connect test light between battery voltage and cruise engaged status circuit at PCM connector. If test light illuminates, go to step 8). If test light does not illuminate, go to step 7).
  6. Replace cruise control module. After replacing module, go to step 9).
  7. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to step 14).
  8. Locate and repair short to ground in cruise engaged status circuit. After repairs, go to next step.
  9. Clear DTCs. Start engine and read DTCs. If DTC P1554 resets, return to step 2). If DTC does not reset, repair is complete.
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