Chery QQ6 (S21) / S12LHD. Manual — part 205

information record will be stored in memory after the identified failure disappears (after
troubleshooting).
When a failure is identified for the first time, Hz will be set as its initial value 40. If
failure status does not change, then this numerical value will maintain all along.
Once it is identified that this failure has disappeared and the state has held for a certain
time, whenever the engine starts with success (its engine speed has exceeded the value
at end of starting) once, Hz will decrease by 1. At this point, ECU will believe that this
failure has disappeared, but the failure information record still exists.
If a failure (for example, as a result of poor contact) frequently appears and disappears,
then Hz will increase by 1, but will not exceed its given upper limit value 100.
If value of Hz has been decreased to zero, the failure information records in this failure
memory will be completely cleared.

5. Limp Home

For some identified significant failures, when duration exceeds the given

stabilization time, ECU will take appropriate software countermeasures, for example,
closing some control functions such as closed loop control of oxygen sensor etc. and
setting substituted values for some data that are considered to be suspect and so forth.
At this point, though the working condition of the engine is comparatively poor, the
auto can still run. The purpose to do this is to enable the auto limply run home or to a
service station for overhaul, so as to avoid the embarrassment that the auto breaks down
on highway or afield. Once it is identified that the failure has disappeared and Hz has
fell to below 40, use of normal data will be resumed again.

6. Failure Alert

In the electric control system, when failure take places in any of such important

parts as ECU, absolute pressure sensor in intake manifold, throttle position sensor,
coolant temperature sensor, knock sensor, oxygen sensor, phase sensor, injector, two
driver stages of step motor of idle speed actuator, canister control valve, or fan relay at
corresponding failure location, ECU will give an alarm through lightening of failure
indicator lamp until this failure location restores.

7. Readout of Failure

The failure information records can be called out of ECU through a trouble diagnosis
tester. If the failure relates to the function of mixed air (fuel and air) proportional
regulator, then the engine must at least run for 4 minutes before reading out failure
information records; especially for failure in oxygen sensor, be sure not to detect data
until the engine runs and warms up.
- -



Figure 3-1 ISO 9141-2 Standard Diagnostic Connector

8. Clearing Failure Information Records

After the failure is removed, the failure information records in memory should be

cleared. The diagnostic trouble code can be cleared through the following approaches:
When the numerical value of frequency counter in ECU reaches zero, the failure
information records in failure memory will be automatically cleared.
Employing fault diagnostic tester to clear records of failure with the instruction of “reset
memory for records of failure”.
Pulling out connectors of ECU or disconnecting wires of battery to clear records of
failure in external ram.

9. Failure Locating

After obtaining failure information records through above means, only rough

location where the failure takes place is aware, but this does not mean that the failure
has been located; because the cause that triggers a piece of failure information may be
damage of electric element (such as sensor, actuator or ECU etc.), lead break, lead
short-circuit to ground or anode of battery, even may be mechanical failure.

The failure is intrinsic and the result of its extrinsic representations is a variety of

symptoms. After a symptom is found, first, check for failure information records with a
trouble diagnosis tester or based on the flash code, after that, remove the correlated
failure in accordance with the failure information, and then locate the failure based on
symptom of the engine.

10. Failure Code Table

No.

DTC

Explanation

Failure

class

1

P0016

Improper relative installation position between camshaft and crankshaft

class5

2

P0030

Failure in heating control circuit of upstream oxygen sensor

class31

3

P0031

Too low voltage in heating control circuit of upstream oxygen sensor

class31

4

P0032

Too high voltage in heating control circuit of upstream oxygen sensor

class31

5

P0105

Signal failure of intake air pressure sensor

class31

6

P0106

Improper signal from intake air pressure sensor

class31

7

P0107

Too low voltage in signal circuit of intake air pressure sensor

class31

8

P0108

Too high voltage in signal circuit of intake air pressure sensor

class31

9

P0112

Too low voltage in signal circuit of intake air temperature sensor

class5

10

P0113

Too high voltage in signal circuit of intake air temperature sensor

class5

11

P0117

Too low voltage in signal circuit of engine coolant temperature sensor

class31

12

P0118

Too high voltage in signal circuit of engine coolant temperature sensor

class31

13

P0121

Improper signal from electronic throttle position sensor 1

class34

14

P0122

Too low voltage in signal circuit of electronic throttle position sensor 1

class34

15

P0123

Too high voltage in signal circuit of electronic throttle position sensor 1

class34

16

P0130

Improper signal from upstream oxygen sensor

class31

17

P0131

Too low voltage in signal circuit of upstream oxygen sensor

class31

18

P0132

Too high voltage in signal circuit of upstream oxygen sensor

class31

19

P0134

Failure in signal circuit of upstream oxygen sensor

class31

20

P0201

Failure in 1# cylinder injector control circuit

class5

21

P0202

Failure in 2# cylinder injector control circuit

class5

22

P0203

Failure in 3# cylinder injector control circuit

class5

23

P0204

Failure in 4# cylinder injector control circuit

class5

24

P0219

Engine revolution exceeds the maximum revolution limit

class5

25

P0221

Improper signal from electronic throttle position sensor 2

class34

26

P0222

Too low voltage in signal circuit of electronic throttle position sensor 2

class34

27

P0223

Too high voltage in signal circuit of electronic throttle position sensor 2

class34

28

P0261

Too low voltage in 1# cylinder injector control circuit

class5

29

P0262

Too high voltage in 1# cylinder injector control circuit

class5

30

P0264

Too low voltage in 2# cylinder injector control circuit

class5

31

P0265

Too high voltage in 2# cylinder injector control circuit

class5

32

P0267

Too low voltage in 3# cylinder injector control circuit

class5

33

P0268

Too high voltage in 3# cylinder injector control circuit

class5

34

P0270

Too low voltage in 4# cylinder injector control circuit

class5

35

P0271

Too high voltage in 4# cylinder injector control circuit

class5

36

P0321

Improper signal of crankshaft top dead center

class33

37

P0322

Engine speed signal failure

class33

38

P0324

Failure in knock signal processing chip and its circuit

class5

39

P0327

Too low voltage in signal circuit of knock sensor

class31

40

P0328

Too high voltage in signal circuit of knock sensor

class31

41

P0340

Failure in signal circuit of phase sensor

class5

42

P0341

Improper signal from phase sensor

class5

43

P0342

Too low voltage in signal circuit of phase sensor

class5

44

P0343

Too high voltage in signal circuit of phase sensor

class5

45

P0444

Failure in control circuit of canister control valve

class31

46

P0458

Too low voltage in control circuit of canister control valve

class31

47

P0459

Too high voltage in control circuit of canister control valve

class31

48

P0480

Failure in relay control circuit of electronic cooling fan (low speed)

class5

49

P0481

Failure in relay control circuit of electronic cooling fan (high speed)

class5

50

P0501

Improper speed signal

class5

51

P0504

Improper signal of brake pedal A/B

class5

52

P0506

Engine speed under idle speed control is below the target idle speed

class5

53

P0507

Engine speed under idle speed control is above the target idle speed

class5

54

P0537

Too low voltage in signal circuit of evaporator temperature sensor

class5

55

P0538

Too high voltage in signal circuit of evaporator temperature sensor

class5

56

P0560

Improper system voltage signal

class33

57

P0562

Too low system voltage signal

class33

58

P0563

Too high system voltage signal

class33

59

P0571

Failure in signal circuit of brake pedal

class5

60

P0601

Failure in EEPROM of ECU

class33

61

P0602

Unprogrammed failure in ECU

class33

62

P0604

Failure in RAM of ECU

class34

63

P0605

Failure in ROM of ECU

class34

64

P0606

Safety monitoring function failure of electronic throttle

class34

65

P0627

Failure in control circuit of fuel pump relay

class33

66

P0628

Too low voltage in control circuit of fuel pump relay

class33

67

P0629

Too high voltage in control circuit of fuel pump relay

class33

68

P0645

Failure in control circuit of A/C compressor relay

class5

69

P0646

Too low voltage in control circuit of A/C compressor relay

class5

70

P0647

Too high voltage in control circuit of A/C compressor relay

class5

71

P0688

Improper output voltage of main relay

class33

72

P0689

Too low output voltage of main relay

class33

73

P0690

Too high output voltage of main relay

class33

74

P0691

Too low voltage in relay control circuit of electronic cooling fan (low speed)

class5

75

P0692

Too high voltage in relay control circuit of electronic cooling fan (low

speed)

class5

76

P0693

Too low voltage in relay control circuit of electronic cooling fan (high

speed)

class5