Chery QQ6 (S21) / S12LHD. Manual — part 110
11.14 Double Brake Switch
Failure codes: P0571, P0504
No.
Operating steps
Result
Follow up steps
1
Put the ignition switch to “ON”.
Next step
Yes
Next step
2
Pull out brake switch joint on harness, and then
use a multimeter to check if it is short or break
circuit between 1#, 2# pins of this joint and 21#,
58# pins of ECU.
No
Check the circuit
Yes
Next step
3
Close the ignition switch, and then check if an
around 12V battery voltage is present on 3# pin of
the switch joint.
No
Check the circuit
Yes
Next step
4
Open the ignition switch, and then check if an
around 12V battery voltage is present on 4# pin of
the switch joint.
No
Check the circuit
Yes
Next step
5
Release brake pedal, disconnect sensor connector,
and then check if 1# and 3# pins cut off.
No
Replace the brake
switch
Yes
Next step
6
Release brake pedal, disconnect sensor connector,
and then check if 2# and 3# pins conducts.
No
Replace the brake
switch
Yes
Next step
7
Apply brake pedal, disconnect sensor connector,
and then check if 1# and 3# pins conducts.
No
Replace the brake
switch
Yes
Check other part
8
Apply brake pedal, disconnect sensor connector,
and then check if 2# and 4# pins cut off.
No
Replace the brake
switch
11.15 Theft-proof Control System Failure
No.
Operating steps
Result
Follow up steps
1
Insert the ignition key into the ignition lock.
Next step
Yes
Check other part
2
Put the ignition switch to ON position, and then
observe if engine failure indicator lamp or EPC
lamp works normally (quick flash of failure
indicator lamp or EPC lamp indicates a abnormal
condition).
No
Next step
Yes
Remove the failure
and clear the DTC
3
Connect a diagnostic tester to the system, and then
enter corresponding diagnostic program unit to
check if DTC exists in the system.
No
Next step
Yes
Next step
4
Pull out theft-proof module joint on harness, and
then use a multimeter to check if an around 12V
operating voltage is present on A1#, A4# pins of
the joint when ignition switch is under ON state.
No
Check the circuit
Yes
Check the circuit
5
Pull out theft-proof module joint on harness, and
then use a multimeter to check if such electric and
circuit failures as short circuit and break circuit
exist in the circuit between A5#, A8# pins of this
joint and 31# and 71# pins of ECU.
No
Next step
Yes
Check the circuit
6
Pull out theft-proof module joint on harness, and
then use a multimeter to check if poor contact
exists between A2# pin of this joint and ground
wire of the vehicle.
No
Next step
Yes
Check the circuit
7
Pull out theft-proof module joint on harness, and
then use Ohm Shift of the multimeter to check if
the circuit between B1#, B2#, B3# pins of this
joint and the coil exists.
No
Replace
the
theft-proof module
12. Steps for Implementation of Failure Diagnosis by Engine
Symptom
12.1 Perform Preliminary Inspection First before Following the Steps for
Implementation of Failure Diagnosis by Engine Symptom.
(1) Make sure that ECU and failure indicator lamp (or EPC lamp) have no off-normal
phenomenon (excluding the models that have no failure indicator lamp).
(2) Use a failure diagnostic tester to check and make sure no failure information record
exists.
(3) Employ failure diagnostic tester to check that hot idle data from electronic control
system fall within normal scope.
Hot idle speed parameter table:
Name
Parameter
Air intake temperature
20-70℃
Battery voltage
12-14V (affected by engine revolution)
Temperature of engine coolant
80-90
(normal operating temperature)
℃
Position of accelerator pedal
0%~99.00%
Air-fuel ratio control integrator
5%-5%
Ignition advance angle
5-10
° (
may change with fluctuation of
engine revolution)
Outer corner of throttle
0%~99.61%
Fuel injection time
2-7ms (has a strong relation with engine
revolution)
Engine revolution n
Expected idle speed ± 50rpm
Duty cycle of canister control valve
0%~99.9%
Self-adapting value of air-fuel ratio
control
0.95-1.05
Self-adapting value of air-fuel ratio
control
120-140
Intake manifold absolute pressure
350-650hPa
Voltage of oxygen sensor
Quickly fluctuates at 0.1-0.9V
Air intake pressure
(4) Validate that the failure effect the owner complained exists and then locate the exact
position of the symptom. Please note that the information provided by the customer is
very important, especially the failure symptoms, occurrence time, position and if any
other failure symptoms occurred before; these information can help technical personnel
rapidly and effectively judge the failure, thus increasing maintenance speed and
improving maintenance quality.
Then check the appearance:
Check that grounding of wire harness is clean and firm.
Check that vacuum pipeline is unbroken, twisted and in right connection.
Check that there is no obstruction in pipe.
Check that air intake pipe is not squashed or damaged.
Check that the seal between throttle body and intake manifold is perfect.
Check that ignition cable of ignition system is unbroken, no ageing and in right wiring.
Check that wires are in right connection, no loosing or poor connection for connectors.
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