169 

No.127 Weak with poor performance while accelerating   

General malfunction part:1. fuel containing water; 2. intake pressure sensor and throttle valve 
position sensor;3. spark plug;4. ignition coil; 5. throttle valve body and idling speed bypass air 
duct; 6. intake duct;7、idling speed regulator; 8 oil injector; 9. ignition timing; 10. exhaust pipe. 
General diagnosis flowchart: 

Serial No. 

Operation steps 

Results   

Follow-ups   

Yes Repair 

 

1 

Check there are malfunctions such as clutch skidding, low tire 
pressure, braking dragging, incorrect tire dimension, incorrect 
positioning of four wheels, etc. 

No Next 

step 

Yes 

Repair air intake 
system 

2 

Check air filter is blocked. 

No Next 

step 

Yes Next 

step 

3 

Connect fuel pressure gauge (access point is front end of oil sucker 
of fuel distribution pipe assembly), and start the engine, and check 
fuel pressure is around 350kPa during accelerating.   

No 

Repair oil supply 
system 

Yes Next 

step 

4 

Take out line of one cylinder, and connect spark plug, making spark 
plug electrode about 5mm away from engine body. Startup the 
engine and check strength of high pressure spark is normal. 

No Repair 

ignition 

system 

Yes Next 

step 

5 

Check spark plug of each cylinder, and observe its type and 
clearance conform to the specifications. 

No 

Adjust or replace 

Yes 

Clean concerned parts

6 

Remove idling speed regulator, and check throttle valve body, idling 
speed regulator and idling speed bypass air duct are with carbon 
deposit. 

No Next 

step 

Yes Next 

step 

7 

Check intake pressure sensor, throttle valve position sensor and its 
lines are normal.   

No 

Repair lines or replace 
sensor 

Yes 

Replace malfunction 

8 

Remove oil injector, and check it is leaking or blocked with special 
cleaning and analysis instrument. 

No Next 

step 

Yes Replace 

fuel 

9 

Check fuel condition and observe malfunction is caused just after 
refueling.  

No Next 

step 

Yes Next 

step 

10 

Check ignition sequence and ignition timing of the engine conform to 
the specifications. 

No Repair 

ignition 

timing 

Yes Next 

step 

11 

Check exhaust pipe is smoothly exhausted. 

No 

Repair or replace 
exhaust pipe     

Yes  

Diagnosis help 

12 

Connect commutator of electric injection system, and open ignition 
switch, and check power supply of 12#, 13#, 44#,    45#, ,63# pins 
are normal; check bonding of 3#, 51#, 53#, 61#, 80# pins are 
normal. 

No  

Repair corresponding 
lines 

 

 
 

 

 

170 

No.128 Malfunction code with EOBD system   

NO Malfunction 

code 

Description 

Malfunction 

level 

1 

P0030 

Open-circuit of heating control circuit of upstream oxygen sensor 

3 

2 

P0031 

Short-circuit to earth of heating control circuit of upstream oxygen sensor 

3 

3 P0032 

Short-circuit to power source of heating control circuit of upstream oxygen 
sensor 

3 

4 

P0036 

Open-circuit of heating control circuit of downstream oxygen sensor 

3 

5 

P0037 

Short-circuit to earth of heating control circuit for downstream oxygen sensor 

3 

6 P0038 

Short-circuit to power source of heating control circuit for downstream oxygen 
sensor 

3 

7 P0053 

Unreasonable heating internal resistance, upstream oxygen sensor 

3 

8 

P0054 

Unreasonable heating internal resistance, downstream oxygen sensor 

3 

9 

P0105 

Unchanged signal (icing) of intake pressure sensor 

3 

10 

P0106 

Intake pressure sensor unreasonable 

3 

11 

P0107 

Intake pressure sensor short circuit to earth 

3 

12 

P0108 

Intake pressure sensor short circuit to power source 

3 

13 

P0112 

Too low signal voltage of intake temperature sensor 

3 

14 

P0113 

Too high signal voltage of intake temperature sensor 

3 

15 

P0116 

Unreasonable temperature signal of engine coolant 

3 

16 

P0117 

Too low circuit voltage of temperature sensor of engine coolant 

3 

17 

P0118 

Too high circuit voltage of temperature sensor of engine coolant 

3 

18 

P0122 

Circuit voltage exceeding minimum value, throttle position sensor 

3 

19 

P0123 

Circuit voltage exceeding maximum value, throttle position sensor 

3 

20 

P0130 

Unreasonable signal upstream oxygen sensor   

3 

21 

P0132 

Circuit voltage too high, upstream oxygen sensor signal 

3 

22 

P0133 

Upstream oxygen sensor aging (signal slows down) 

3 

 
 

 

 

171 

23 

P0134 

Circuit signal malfunction, upstream oxygen sensor 

3 

24 

P0136 

Unreasonable signal of downstream oxygen sensor   

3 

25 

P0138 

Circuit voltage too high, downstream oxygen sensor signal 

3 

26 

P0140 

Circuit signal malfunction, downstream oxygen sensor 

3 

27 P0170 

Unreasonable self-learning of closed-loop control of air fuel ratio for off-line 
test 

7 

28 

P0171 

Over-thin of self-learning of closed-loop control of air fuel ratio for off-line test 

7 

29 

P0172 

Lower cable inspection air/fuel ratio closed circuit self-adaptation too thick 

7 

30 

P0201 

Open circuit of 1st cylinder fuel injector controlling circuit 

3 

31 

P0202 

Open circuit of 2nd cylinder fuel injector controlling circuit 

3 

32 

P0203 

3rd cylinder fuel injector controlling circuit open circuit 

3 

33 

P0204 

Open circuit of 4th cylinder fuel injector controlling l circuit 

3 

34 

P0261 

Short circuit to earth of 1st cylinder fuel injector controlling circuit 

3 

35 

P0262 

Short circuit to power supply of 1st cylinder fuel injector controlling circuit   

3 

36 

P0264 

  Short circuit to earth of 2nd cylinder fuel injector controlling circuit   

3 

37 

P0265 

Short circuit to power supply of 2nd cylinder fuel injector controlling t circuit   

3 

38 

P0267 

Short circuit to earth of 3rd cylinder fuel injector controlling circuit   

3 

39 

P0268 

Short circuit to power supply of 3rd cylinder fuel injector controlling circuit   

3 

40 

P0270 

Short circuit to earth of 4th cylinder fuel injector controlling circuit   

3 

41 

P0271 

Short circuit to power supply of    4th cylinder fuel injector controlling circuit   

3 

42 

P0300 

Several cylinders misfire 

2 

43 

P0301 

1st cylinder misfire 

2 

 
 

 

 

172 

44 

P0302 

2nd cylinder misfire 

2 

45 

P0303 

3rd cylinder misfire 

2 

46 

P0304 

4th cylinder misfire 

2 

47 

P0318 

Damaged circuit inspection accelerating sensor signal failure 

3 

48 

P0321 

Crankshaft signal error 

3 

49 

P0322 

No engine speed sensor pulse signal (open or short circuit) 

4 

50 

P0324 

Knock signal processing chip and other circuit malfunction 

6 

51 

P0327 

Knock sensor signal circuit voltage lower than normal value 

3 

52 

P0328 

Knock sensor signal circuit voltage over normal value 

3 

53 

P0340 

Improper phase sensor mounting position   

3 

54 

P0341 

Poor phase sensor conduction 

3 

55 

P0342 

Phase sensor short circuit with earth 

3 

56 

P0343 

Phase sensor short circuit with power supply 

3 

57 

P0420 

3 way catalytic converter ageing (emission over standard level) 

3 

58 

P0444 

Canister valve controlling circuit open circuit 

3 

59 

P0458 

Canister valve controlling circuit voltage lower than normal value 

3 

60 

P0459 

Canister valve controlling circuit voltage over normal value 

3 

61 

P0480 

Cooling fan relay controlling circuit open circuit (low speed) 

5 

62 

P0481 

Cooling fan relay controlling circuit open circuit (high speed) 

5 

63 

P0501 

Vehicle speed sensor signal unreasonable 

3