Maintenance Manual for Chery·Windcloud Marelli EFI System
5
A. Check intake system for severe air leakage;
B. Check injectors for blockage;
C. Check spark plug to see if clearance is proper;
D. Check sub live wire to see if resistance is too
high;
E. Check valve clearance to see if it is proper, etc.
Yes
Repair as per
diagnosis
Failure: self-adaptation of air fuel ratio closed-loop control exceeds lower
limit (too thin)
Step Operation Result Solution
1
Connect scanner and commutator, and then turn
ignition switch to “ON”.
Go to next step
Yes Go to next step
2
Start engine and idle it until coolant temperature is
normal. Observe Oxygen Sensor Voltage on scanner
under all working conditions to see if the value
indication maintains stable around 900mV under
some working conditions for a long time.
No
Diagnosis
Instruction
Yes Go to next step
3
Connect a fuel pressure gauge to fuel inlet pipe of
fuel system and observe fuel pressure under all
working conditions to see if it is around 350kPa.
No
Check and
repair fuel
system
Yes
Repair or
replace wire
harness
4
Check respectively the connections between Pin 20
of ECU and Pin A of sensor connector, Pin 9 of
ECU and Pin B of sensor connector (two thin wires
on ECU wire harness, the two thick wires are
heating coils) to see if short circuit occurs.
No Go to next step
Yes
Repair as per
diagnosis
5
A. Check injector for leakage;
B. Check exhaust pipe for leakage;
C. Check ignition timing to see if it is proper;
D. Check intake conduit to see if it is worn out;
E. Check valve clearance to see if it is proper; etc.
No
Diagnosis
Instruction
Failure: injector circuit error in Cylinder 1
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 Cylinder 1 injector connector from wire
harness, check the voltage between Pin 1 of the
connector and cathode of power supply with a
multimeter to see if it is around 12V.
No Go to next step
22
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