Maintenance Manual for Chery·Windcloud Marelli EFI System
Check the resistance between Pin 1 and Pin 2 of
carbon canister control valve with a multimeter to
see if it is between 17.5-23.5Ω at 20℃.
No
Replace
control valve
Yes
Diagnosis
Instruction
5
Check the voltage between Pin 2 of carbon canister
control valve connector and cathode of power
supply with a multimeter to see if it is around 3.7V.
No Go to next step
Yes
Repair or
replace wire
harness
6
Check the connection between Pin 2 of carbon
canister control valve connector and Pin 52 of ECU
to see if short circuit to ground occurs.
No
Diagnosis
Instruction
Failure: too high driver stage control circuit voltage of carbon canister
control valve
Step Operation Result Solution
1
Connect scanner and commutator, and then turn
ignition switch to “ON”.
Go to next step
Yes Go to Step 4
2
Unplug carbon canister control valve connector
from wire harness, check the voltage between Pin 1
of connector and cathode of power supply with a
multimeter to see if it is around 12V.
No Go to next step
Yes
Repair or
replace wire
harness
3
Check power supply terminal wiring of carbon
canister control valve to see if open circuit or short
circuit to ground occurs.
No Go to Step 2
Yes Go to next step
4
Check the resistance between Pin 1 and Pin 2 of
carbon canister control valve with a multimeter to
see if it is between 22-30Ω at 20℃.
No
Replace
control valve
Yes
Diagnosis
Instruction
5
Check the voltage between Pin 2 of carbon canister
control valve connector and cathode of power
supply with a multimeter to see if it is around 3.7V.
No Go to next step
Yes
Repair or
replace wire
harness
6
Check the connection between Pin 2 of carbon
canister control valve connector and Pin 52 of ECU
to see if short circuit occurs.
No
Diagnosis
Instruction
Failure: lower idling speed than target value
Step Operation Result Solution
1 Connect scanner and commutator, and then turn Go to next step
28
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