DTC P064D:00 [L5]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSES

DTC P064D:00	Internal control module A/F sensor processor performance problem
DETECTION CONDITION	The A/F sensor IC integrated in PCM converts to voltage value for fuel control and for diagnosis based on the A/F sensor signal current and sends to CPU (integrated in PCM). The CPU switches the voltage value for the fuel control and for the diagnosis in the fuel control once during one drive cycle, and compares the voltage values. If the difference of compared value is below threshold, the PCM determines that the signal circuit between CPU and A/F sensor control IC has malfunction. MONITORING CONDITIONS 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 1.2V-battery voltage-1.2 V (PCM terminals 2Z, 2AC, 2AD) Diagnostic support note This is a continuous monitor (A/F sensor, HO2S). The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle FREEZE FRAME DATA is available The DTC is stored in PCM memory
POSSIBLE CAUSE	PCM internal malfunction (between CPU and A/F sensor control IC communication line)

DTC P064D:00

Internal control module A/F sensor processor performance problem

DETECTION CONDITION

The A/F sensor IC integrated in PCM converts to voltage value for fuel control and for diagnosis based on the A/F sensor signal current and sends to CPU (integrated in PCM). The CPU switches the voltage value for the fuel control and for the diagnosis in the fuel control once during one drive cycle, and compares the voltage values. If the difference of compared value is below threshold, the PCM determines that the signal circuit between CPU and A/F sensor control IC has malfunction.

MONITORING CONDITIONS

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 1.2V-battery voltage-1.2 V (PCM terminals 2Z, 2AC, 2AD)

Diagnostic support note

This is a continuous monitor (A/F sensor, HO2S).
The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle
FREEZE FRAME DATA is available
The DTC is stored in PCM memory

POSSIBLE CAUSE

PCM internal malfunction (between CPU and A/F sensor control IC communication line)