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DTC P064D-00: Internal Control Module A/F Sensor Processor Performance Problem: Notes

DTC P064D:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC P064D:00 Internal control module A/F sensor processor performance problem
DETECTION CONDITION
  • The A/F sensor IC integrated in the PCM converts to the voltage value for the fuel control and for the diagnosis based on the A/F sensor signal current and sends to the CPU (integrated in the PCM). If there is a transmission format error from the A/F sensor IC to the PCM, the PCM will detect a transmission error.

    MONITORING CONDITIONS

    • Drive Mode 03 (EGR System, A/F Sensor Heater, HO2S Heater, A/F Sensor, HO2S and TWC Repair Verification Drive Mode)
    • Following conditions are met:
  • Engine is running or ignition switch is ON
    • A/F sensor signal voltage is 1.2 V-battery voltage -1.2 V (PCM terminals 2Z, 2AC, 2AD)

    Diagnostic support note

  • This is a continuous monitor (CCM).
  • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.
  • FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
  • The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION
  • Fixes the duty value of the A/F sensor heater.
  • Stops the fuel feedback control.
POSSIBLE CAUSE
  • PCM internal malfunction (between CPU and A/F sensor control IC communication line)
SYSTEM WIRING DIAGRAM -
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