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Home >> Chevrolet >> 1998 >> Cavalier RS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.2L >> Diagnostic Trouble Codes >> DTC P1621 - Pcm Memory Performance >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  3. Using scan tool, CLEAR INFO or CLEAR DTCS function to clear DTC. Start and warm engine to normal operating temperature. Operate vehicle within the conditions foe setting DTC. If scan tool indicates that diagnostic ran and passed, go to next step. If scan tool does not indicate that diagnostic ran and passed, repeat step 2).
  4. Check if any additional DTC(s) are present. If additional DTCs are present, diagnose affected DTC(s) first. If no other DTCs are present, system is okay.
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