Canister Control Valve Driving Stage - Lifan 620 Maintenance Manual

9. Canister control valve driving stage (see Table 1-11)
Diagnostic Trouble Code (DTC)
P0444
P0445
S/N
Start the engine, keep idle speed until the coolant
1
reaches normal temperature.
Disconnect the canister control valve from the
2 harness. Measure the voltage between the two pins
with a multimeter. Is the voltage about 12V?
Connect the canister control valve, increase the
engine rotation speed to 1500r/m, touch the valve with
3
your hand, and check the valve for slight vibration and
shock.
Measure the resistance between pin (1) and pin (2)
4 with a multimeter. Is the resistance between 22 and
30?
Check for open or short circuit between pin J1-02 of
5 the main relay and the pin (1) of the canister control
valve with a multimeter.
6 Repari or replace the main relay and its circuit.
Stop the engine. Check for open or short circuit
7 between pin J1-63 of the ECU and the pin (2) of the
canister control valve with a multimeter.
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Table 1-11
Evaporative emission control system, canister control valve
circuit open
Evaporative emission control system, canister control valve
circuit short
Operation
43
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Trouble Location or Type
Test Results Actions
Next step
Yes Next step
No 5 (check hot wire)
Yes Next step
No 7 (check ground wire)
Yes Replace ECU
No Check canister control valve
Yes Repair or replace harness
No Next step
Yes Repair or replace harness
No Replace ECU