Chery A11 2003 User Manual

Maintenance Manual for Chery·Windcloud Marelli EFI System
Yes Go to next step
2
Unplug oxygen sensor connector from wire harness,
and check the voltage between Pin C
(corresponding to white wire of oxygen sensor) and
Pin D (corresponding to white wire of oxygen
sensor, two thick wires on ECU wire harness) of the
connector with a multimeter to see if it is around
12V.
No Go to Step 4
Yes Go to next step
3
Check the resistance between Pin C (white) and Pin
D (white) of oxygen sensor with a multimeter to see
if it is around 4.5Ω (23 ± 5°C).
No Replace sensor
Yes Replace fuse
4
Check the 10A fuse in oxygen sensor heating circuit
to see if it is blown.
No Go to next step
Yes
Repair or
replace wire
harness
5
Check respectively the connections between Pin 28
of ECU and Pin C (corresponding to white wire of
oxygen sensor) of sensor connector, Pin 87 of main
relay and Pin D (corresponding to white wire of
oxygen sensor) of sensor connector to see if open or
short circuit to power/ground occurs.
No
Diagnosis
Instruction
Failure: self-adaptation of air fuel ratio closed-loop control exceeds upper
limit
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 100mV 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 they are short circuit to
ground.
No Go to next step
21

Chery A11 2003 Specifications

General

Brand	Chery
Model	A11 2003
Category	Automobile
Language	English