Chery QQ6 Service Manual download pdf (Page 30)

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

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 84 85

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Chery QQ6 Service Manual Page 30