Geely JL481Q, Manual

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4. Examine the VSV valve’s working condition
(1) Check whether the air flows smoothly from the gas port E to the
gas port F (See Fig. 262).
(2) Connect the positive and negative poles of the battery respec-
tively to the two terminals of the VSV valve; and then examine the
airflow from the gas port E to the gas port F(See. 263).
If performance does not accord with the specified requirements, you
shall replace VSV.
5. Reinstall the VSV valve and connect the hose for evaporative
emission.
Common cause of fault:
1. With abnormal high voltage or reversal high current.
2. Vacuum unit is damaged in service.
It’s forbidden to impulse vacuum unit with high voltage
gas: Inspect whether the alternator output voltage or
current is normal when you replace sensor in finding
fault
VII. Examination of Intake pressure & temperature sensor
Pressure sensor(see Fig 264), intake pressure & temperature sensor performance curve(see Fig. 265)
Symptom of fault: flame out, poor idle.
Fig. 261 Examine the grounding of VSV valve
Fig. 263 Examine the air flow after being powered on Fig. 262 Examine the airflow
Ohmmeter
No trgger
Fig.265 Intake pressure & temperature sensor performance curve.
1.Seal ring
2.Stainess steel bush
3.PCB board
4.Sensor unit
5.Case
6.Pressure bracket
7.Welding connection
8.Adhesion connection
Pressure sensor characteristic curve
Temperature sensor characteristic curve
Temperature T
Absolute pressure
Resistance w
Output voltage
Fig .264 Sectional of DS-S/TF pressure sensor
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