Chery QQ6 (S21) / S12LHD. Manual — part 251

106

P2191

Self-study value of closed loop air fuel ratio control is above the upper limit

(heavy load zone)

class5

107

P2192

Self-study value of closed loop air fuel ratio control is below the lower limit

(heavy load zone)

class5

Electrical Schematic Diagram of Diagnostic Interface

Main power cord

Engine
theft-proof
module 1

11. The Steps for Implementation of Failure Diagnosis According to

Failure Information Records

11.1 Electronic Throttle Failure

Failure codes: P012, P0122, P0123, P022, P0222, P0223, P1336, P154, P1558, P1559, P1564,

P1565, P1568, P1579, P1604

No.

Operating steps

Result

Follow up steps

1

Put the ignition switch to “ON”.

Next step

Yes

Next step

2

Pull out the joint of throttle position sensor on

harness; use a multimeter to check if the

magnitude of voltage between its 3# and 5# pins

is around 12V and if a 5V voltage is present

between 6# and 2# pins.

No

5

Yes

Next step

3

Use a multimeter to check if the resistance

values between 1#, 4# and 6# pins of the sensor

are between 0.5kΩ and 1.6kΩ.

No

Replace the sensor

Yes

Replace the sensor

4

Meanwhile, use a multimeter to check if it is

break or short circuit between 1#, 4# and 6#

pins of throttle position sensor and ECU38#,

54#, 36#; or, turn blade of the throttle to observe

if its resistance value jumps and if the resistance

values between 1#, 4# and 6# change

accordingly with rotation of throttle.

No

Replace ECU

Yes

Repair or replace

wire harness

5

Connect an adaptor between ECU and harness,

use a multimeter respectively check if it is break

or short circuit between 1#, 2#, 6# and 4# pins

of the sensor and 10#, 32#, 36# and 54# pins of

ECU joint.

No

Replace ECU

Note: This auto adopts the electronic throttle body and has cancelled former step motor,
and the functions that were accomplished by the stop motor on a common throttle body
are now completely accomplished by the throttle driving motor. The electronic throttle
can not be repaired and failure rate of the throttle body is very low, if damaged,
replacing the assembly is the only choice to deal with the problem.

Special attention: The electronic throttle body can not be disassembled and repaired at
service station; in addition, after replacing electronic throttle body, be sure to let it carry
out self-study; otherwise, unsteady working at idle speed of engine may occur. See also
the section about electronic throttle for detailed study scheme. Maintenance of the
throttle body is analogous to that of the common valve body.

11.2 Knock Sensor failure

Failure codes: P0324, P0327, P0328

No.

Operating steps

Result

Follow up steps

1

Close the ignition switch, and the engine stops.

Next step

Yes

Next step

2

Pull out the joint of knock sensor on harness, use a

multimeter to check if both resistance values

between 1# and 2# pins and between 1# pin and

shielded wire (sensor shield) pin of knock sensor

are more than 1MΩ.

No

Replace with a new

sensor

Yes

Next step

3

Knock on the edge of knock sensor with a small

hammer and check with multimeter if there is

communicating signal output between sensor pin

1# and 2#.

No

Replace the sensor

4

Turn on the ignition switch but do not start the

engine.

Next step

Yes

Repair or replace

wires

5

Connect an adaptor between ECU and harness, use

a multimeter respectively check if it is break or

short circuit between 19#, 20# pins of ECU and

1#, 2# pins of sensor joint.

No

Replace ECU

Note: Generally, knock sensor is not liable to damage. When disassembling and installing the knock

sensor, be careful not to leave dirt on the contact surface of the sensor and the engine body and do

not add any gasket. If the sensor is damaged, it will have an comparatively great effect on

economical efficiency and emission of the engine. After the knock sensor is damaged, the electric

control system of the engine will lock ignition advance angle of the engine at a fixed ignition angle,

so, the acceleration performance of the engine will fall and economical efficiency and emission of

the engine will also be greatly affected.

11.3 Air Pressure Sensor Failure

Failure codes: P0102, P0103, P0112, P0113

No.

Operating steps

Result

Follow up steps

1

Put the ignition switch to “ON”.

Next step

Yes

4

2

Pull out joint of intake air pressure sensor on

harness; use a multimeter to check if a 5V

voltage is present between 2# and 3# pins of the

joint.

No

Next step

Yes

Repair or replace

harness

3

Between ECU and harness, use a multimeter to

respectively check if it is break or short circuit

between 42# and 33# pins of ECU and 1#, 2#,

3#, 4# pins of sensor joint.

No

Next step

4

Replace the intake air temperature pressure

sensor.

Next step

Note: In case the sensor shorts to 5V or 12V power supply or ground, the engine may not start up or

stop running.