DTC P1443 VENT CONTROL SOLENOID VALVE FUNCTION PROBLEM

DTC P1443 VENT CONTROL SOLENOID VALVE FUNCTION PROBLEM

(1)	Bobbin	(8)	Magnetic plate	(15)	Diaphragm
(2)	Coil	(9)	Shaft	(16)	Movable core
(3)	Diode	(10)	Plate	(17)	Spring
(4)	Stator core	(11)	Valve	(18)	Cover
(5)	End plate	(12)	Housing	(19)	O-ring
(6)	Body	(13)	Filter
(7)	Yoke	(14)	Retainer

ENABLE CONDITION

Secondary Parameter	Enable Condition
Drain valve	Open
Battery voltage	≥10.9 V
Atmospheric pressure	≥75.0 kPa (563 mmHg, 22.17 inHg)
Tank pressure when starter ON → OFF	−0.7←→1.4 kPa (−5 ←→10.7 mmHg, −0.20 ←→ 0.42 inHg)

GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

DIAGNOSTIC METHOD

Abnormality Judgment

Judge NG when the continuous time of completing the malfunction criteria below becomes more than 3 seconds.

Judgment Value

Malfunction Criteria	Threshold Value
Tank pressure	−4.0 kPa (−30 mmHg, −1.18 inHg)

Time Needed for Diagnosis: 3 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as the malfunction occurs.

Normality Judgment

Judge OK and clear the NG when the malfunction criteria below are completed.

Judgment Value

Malfunction Criteria	Threshold Value
Tank pressure	−4.0 kPa (−30 mmHg, −1.18 inHg)
Cumulative time when the malfunction criteria below are completed	≥ 30 seconds
Duty ratio of purge control solenoid valve	Except 0
Fuel temperature	−10 ←→ 45°C (14 ←→ 113°F)
Relative ratio of intake manifold	−26.7 kPa (−200 mmHg, −7.87 inHg)

DTC CLEAR CONDITION

•	When the OK idling cycle was completed 40 times in a row

•	When “Clear Memory” was performed

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION

•	When the OK driving cycle was completed 3 times in a row

•	When “Clear Memory” was performed

FAIL SAFE

PCV control: Open the PCV solenoid.

ECM OPERATION AT DTC SETTING

Memorize the freeze frame data. (For test mode $02)