Chery A11. Manual — part 112

4.3 Rough Idle

Check fault code

determine fault source upon fault

code

Check air intake system

vacuum leakage, air intake

valve dirt

1 Hose connection

2 throttle valve body air intake

valve

3 intake manifold mounting

Check air filter core

Wash or replace

Check ignition system fault

1 check if wire power leakage

2 check if ignition coil breakage

or damage

1 check high-tension

wire

2 check ignition coil

Watch firing of each

cylinder and check spark

plug and spark plug gap

Plug gap: 8mm

NOTE: if necessary,

check compression

pressure and air valve

gap

1 replace spark plug

2 cylinder compression

pressure

3 air valve gap

Throttle valve position

sensor and connection,

repair or replace as

necessary

Check throttle valve position

sensor

Check step motor fault

1 check mounting

screw

2 short vibration

should be felt when

ignition turned on

1 measure step motor coil

resistance

2 check step motor wire

3 replace or turn idle motor

mounting screw

Check fuel circuit fuel

pressure

1 check fuel pressure regulator

2 check fuel pump

3 check fuel filter, repair or replace as

necessary

Check fuel injector

Check fuel injector, injector

dirt, and repair or replace as

necessary.

Check coolant temperature

sensor

Check coolant temperature

sensor and connector, repair or

replace as necessary

Check intake air

temperature pressure

sensor

Check intake air temperature

pressure sensor

Check oxygen sensor

Check oxygen sensor, And

replace if damaged.

4.4 High Idle Speed

Check fault

codes

Determine fault sources

upon diagnostic codes.

Check air intake

system

Vacuum leakage

1 hose connection

2 throttle valve body

intake air valve

3 intake manifold

installation

Check throttle

position sensor

Throttle position sensor

and connection, repair and

replace when necessary.

Check step

motor fault

1 check step motor coil

resistance

2 when warming up and

engine idle, use scan tester

to read step motor total

steps, and adjust the idle

screw till total steps is

20-40

Check coolant

temperature

sensor

Check coolant temperature

sensor and connecting

wire, repair or replace as

necessary.

Check fuel

pressure

Check pressure regulator,

and fuel pressurea, repair

or replace as necessary.

Check fuel

injector

fuel injector, repair or

replace as necessary.

4.5 Low idle speed

If engine idle speed is low referring to each actuator and sensor mentioned above, check

following components:

Engine coolant temperature sensor fault: check engine coolant temperature sensor and

wire, repair or replace as necessary.

Air intake temperature sensor fault: check air intake temperature sensor and wire,repair or

replace as necessary.

Step motor fault or stuck

Throttle position sensor fault: check engine throttle position sensor and wire, repair or

replace when necessary.

Fuel pressure and injector

4.6 engines often stalls

Check step motor fault

1 check mount screw

2 short time vibration

should be felt when

ignition switch turned

on

1 repair or replace step motor

2 check step motor wire

3 replace or turn idle motor

mount screw

Check throttle position

sensor

Throttle position sensor and its

connection, repair or replace as

necessary.

Check throttle valve

gap; warm engine to

80℃, let engine idle,

cut off A/C. Use scan

tester to detect motor

steps. The total steps is

20-30.

1 If steps is not within

specification, adjust the initial

angle of throttle valve, ensuring a

correct total steps.

2 If there exists carbon or tar

deposits, please remove it.

Note: If reliable tool for testing

total idle steps is not available,

DO NOT adjust initial throttle

angle.

Watch each cylinder

firing check and ensure

spark plug and plug gap

is 8mm.

NOTE: Measure

compression pressure

and air valve gap

1 replace spark plug

2 cylinder compression pressure

3 valve gap

Check air intake

manifold pressure

sensor

Check air intake pressure sensor

and wire, repair or replace as

necessary .

Check circuit

connection

1 ECU voltage supply

fusible link

fuse

2 circuit wire test: using voltmeter

or ohmmeter measure voltage or

resistance

★ If engine stalls, check following components:

Air system leakage check