DTC P064D [L3]: Notes

DTC P064D (L3) DETECTION CONDITION & POSSIBLE CAUSES

DTC P064D	Internal control module A/F sensor processor performance
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 verification drive mode Following conditions are met Engine is running or ignition switch is ON position All A/F sensor (PCM terminals 2Z, 2AD, 2AC) signal voltage is 1.2V - battery voltage-1.2 V Diagnostic support note This is a continuous monitor (A/F sensor, HO2S). The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycle or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA is available. DTC is stored in PCM memory.
POSSIBLE CAUSE	PCM internal malfunction (between CPU and A/F sensor control IC communication line)

DTC P064D

Internal control module A/F sensor processor performance

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 verification drive mode
Following conditions are met
- Engine is running or ignition switch is ON position
- All A/F sensor (PCM terminals 2Z, 2AD, 2AC) signal voltage is 1.2V - battery voltage-1.2 V

Diagnostic support note

This is a continuous monitor (A/F sensor, HO2S).
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycle or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
FREEZE FRAME DATA is available.
DTC is stored in PCM memory.

POSSIBLE CAUSE

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