DTC Advanced Diagnostics: P0344 (K20C1) - Honda Civic FC/FK 2016-2021

DTC Advanced Diagnostics: P0344

DTC P0344:Camshaft Position (CMP) Sensor A Circuit Intermittent Interruption

General Description

The camshaft position sensoring operates based on pulse detection and counting. The fundamental components are a pulse plate mounted on the end of the shaft (rotary part) and camshaft position (CMP) sensor A mounted in line with the pulse plate including electronic circuitry (stationary part). Around the circumference of the pulse plate, there are teeth distributed evenly and additional reference markers. This makes it possible to generate an electric pulse pattern when the shaft rotates and the teeth are passing by CMP sensor A. The camshaft position can be determined by counting the number of pulses and deriving the pulse pattern of the electrical signal from CMP sensor A. The PCM compares the generated pulse pattern with a stored calibrated pulse pattern. If the compared pulse pattern does not match, a malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	0.5 second or more
DTC Type	One drive cycle, MIL on

Enable Conditions

Condition
State of the engine	Running

Malfunction Threshold

Any of the conditions is met at least 12 times:

	Camshaft signal has wrong segment length.
	Signal table and reference table have many similar entries but no unique matching was found.
	The latest segment is not in the reference table or it is out of the sequence.
	Too many edge failures are detected.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

	Pulse plate defection
	CMP sensor A failure
	PCM internal circuit failure

Confirmation Procedure

Operating Condition

Start the engine, and let it idle.

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.