Content .. 252 253 254 255 ..

Chery QQ6 (S21) / S12LHD. Manual - part 254

11.10 Failure in Driver Stage of 1#, 2# Coils of Step Motor

Failure codes: P1682, 1683

No.

Operating steps

Result

Follow up steps

Turn on the ignition switch but do not start the

engine.

Next step

Yes

Next step

Pull out connector of the electronic throttle, and

then check if the resistance value between 5# and

3# pins of the connector is around 6.1Ω.

Replace the

electronic throttle

body

Yes

Next step

Pull out the connector, and then use a multimeter

to check if a 12V alternate voltage is present

between 5# and 3# connectors of the electronic

throttle.

Check the circuit

Yes

Replace the idle

speed actuator

Use a multimeter to check if a 12V voltage is

present between the connector of the harness and

ground when the key is ON.

Next step

Yes

Repair or replace

the harness

Between ECU and harness, use a multimeter

respectively to check if it is break or short circuit

between 67#, 65# pins of ECU and 5# pin of the

connector and between 66#, 64# pins of ECU and

3# pin of the connector.

Replace ECU

Note: Much about failure diagnosis for other parts has been involved above.

11.11 Crankshaft Position Sensor Failure

Failure code: P0016

No.

Operating steps

Result

Follow up steps

Put the ignition switch to “ON”.

Next step

Yes

Next step

Pull out camshaft position sensor joint on harness,

and then use a multimeter to check if the voltage

between 1# pin of this joint and ground wire is

around 12V (battery voltage).

Check circuit and

main power supply

Yes

Next step

Pull out camshaft position sensor joint on harness,

and then use a multimeter to check if the voltage

between 2# pin of this joint and ground wire is

around 11.5V (power supply from ECU and the

voltage is below the battery voltage).

Check circuit and

ECU

Yes

Repair or replace

the harness

Use a multimeter to check if it is break or short

circuit between 79# pin of ECU and 2# pin of

sensor joint.

Next step

Yes

Next step

Pull out camshaft position sensor joint on harness,

and then use a multimeter to check if it is

conducting between 3# pin of this joint and

ground wire.

Replace the sensor

Connect the sensor connector and start the engine.

Next step

Yes

Check other part

Use a oscillometer to check if an around 6V

square wave signal output is present in 2# signal

cable.

Replace the sensor

Note: The camshaft position sensor is an auxiliary sensor and has great effect on emission of the system.

When failure occurs in this sensor, the vehicle will be difficult to start; though the vehicle will be

basically normal after startup, driving restrictive practice will be found on the engine and the maximum

revolution of engine can not exceed 4000rpm.

11.12 Craftshaft Position Sensor Failure

Failure codes: P0321, P0322, P0219

No.

Operating steps

Result

Follow up steps

Put the ignition switch to “ON”.

Next step

Yes

Check the circuit

Pull out crankshaft position sensor joint on

harness, use a multimeter to check if it is short or

break circuit between 1# pin of this joint and 34#

pin of ECU.

Next step

Yes

Next step

Pull out crankshaft position sensor joint on

harness, use a multimeter to check if it is short or

break circuit between 3# pin of this joint and 15#

pin of ECU.

Check circuit and

ECU

Yes

Repair or replace

the harness

Use a multimeter to check if it is break or short

circuit between 79# pin of ECU and 2# pin of

sensor joint.

Next step

Yes

Next step

Pull out crankshaft position sensor joint on

harness, and then use a multimeter to check if the

two signal cables on the sensor has a resistance

value of around 1000Ω.

Replace the sensor

Connect the sensor connector and start the engine.

Next step

Yes

Check other part

Use an oscillometer to check if signal waveform

output is present in signal cable.

Replace the sensor

Note: Crankshaft position sensor is the main sensor of electronic control unit of engine. If crankshaft

position sensor failure occurs, the engine will be difficult to start; acceleration performance of the engine

will be greatly restricted after startup; the maximum revolution of the engine can not exceed 3800rpm;

meanwhile, emission of the engine will deteriorate.

11.12 Ignition Coil Failure

No.

Operating steps

Result

Follow up steps

Put the ignition switch to “ON”.

Next step

Yes

Next step

Pull out ignition coil joint on harness, and then use

a multimeter to check if the voltage between 3#

pin of this joint and ground wire is an around 12V

battery voltage.

Check the circuit

Yes

Check circuit and

ECU

Pull out ignition coil joint on harness, and then use

a multimeter to check if it is short or break circuit

between 1# pin of this joint and 5# pin of ECU.

Next step

Yes

Check circuit and

ECU

Pull out ignition coil joint on harness, and then use

a multimeter to check if it is short or break circuit

between 2# pin of this joint and 2# pin of ECU.

Next step

Yes

Next step

Check if the resistance of primary coil of the

sensor is around 0.9Ω.

Replace the ignition

coil

Yes

Next step

Check if the resistance of secondary coil of the

sensor is around 14.5kΩ.

Replace the ignition

coil

Yes

Check other part

Use an oscillometer to check if secondary ignition

waveform of ignition cable of ignition system is

normal.

Replace the ignition

coil

Note: The ignition coil is mainly used to provide ignition system of engine with ignition energy. The

failure rate of the coil itself is very low, but its failure probability can not be completely excluded. When

failure occurs in ignition coil, the ignition energy of engine will be deficient, which may further lead to

such failures as unsteady idle speed of engine and emission deterioration.

Content .. 252 253 254 255 ..