DTC Advanced Diagnostics: P0443 (K20C1) - Honda Civic FC/FK 2016-2021

DTC Advanced Diagnostics: P0443

DTC P0443:Evaporative Emission (EVAP) Canister Purge Valve Circuit Malfunction

General Description

The evaporative emission (EVAP) canister purge valve is attached to the vacuum port between the intake manifold and the EVAP canister. The powertrain control module (PCM) does not turn on the EVAP canister purge valve when the engine coolant temperature is less than a specified value. The PCM adjusts the amount of fuel vapor sent to the engine by controlling the EVAP canister purge valve duty cycle. The EVAP canister purge valve output current and voltage are monitored by the PCM. When the monitoring circuit detects other than normal range for a specified time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	0.5 second or more
DTC Type	Two drive cycles, MIL on

Enable Conditions

Condition	Minimum	Maximum
Engine speed [Engine Speed]	80 rpm	–
12 volt battery voltage [Battery]	8 V	16 V
Other	EVAP canister purge valve power stage on*
Other	EVAP canister purge valve power stage off**

*: Short circuit to power detection
**: Open circuit and short circuit to ground detections
[ ]: HDS Parameter

Malfunction Threshold

	Short circuit to power The EVAP canister purge valve output current is 6 A or more for at least 0.5 second.
	Short circuit to ground The EVAP canister purge valve output voltage is 2.74 V or less for at least 0.5 second.
	Open circuit The EVAP canister purge valve output voltage is higher than 3.26 V, or 4.7 V or less for at least 0.5 second.

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.

	EVAP canister purge valve PCS line short to power
	EVAP canister purge valve PCS line short to ground
	EVAP canister purge valve PCS line open
	PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

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.