DTC P0638:00 [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 P0638:00	Throttle valve actuator control circuit range/performance problem
DETECTION CONDITION	The PCM compares the actual TP with the target TP when the engine is running If the difference is more than the specification, the PCM determines that there is a throttle valve actuator control circuit range/performance problem. Diagnostic support note This is a continuous monitor (CCM). 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 the PCM memory.
POSSIBLE CAUSE	Throttle valve actuator malfunction PCM malfunction

DTC P0638:00

Throttle valve actuator control circuit range/performance problem

DETECTION CONDITION

The PCM compares the actual TP with the target TP when the engine is running If the difference is more than the specification, the PCM determines that there is a throttle valve actuator control circuit range/performance problem.

Diagnostic support note

This is a continuous monitor (CCM).
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 the PCM memory.

POSSIBLE CAUSE

Throttle valve actuator malfunction
PCM malfunction