Chery QQ6 (S21) / S12LHD. Manual - part 250
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