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DTC C1658: EEPROM Calibration Malfunction

  1. Perform RTD diagnostic system check. See RTD DIAGNOSTIC SYSTEM CHECK . After performing RTD diagnostic system check, go to next step.
  2. Using scan tool, clear all DTCs. Cycle ignition off then on. Using scan tool, check for DTCs. If DTC C1658 is set, go to next step. If DTC C1658 is not set, system is functioning properly.
  3. Replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  4. Turn ignition off. Connect or install any connector or components that were disconnected or removed. Turn ignition on. Using scan tool, clear all DTCs. After repairs, perform RTD diagnostic system check.
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