Chery automobile Service Manual page 171

PROCEDURES FOR FAULT DIAGNOSIS ACCORDING TO THE
A preliminary inspection should be carried out before implementing the steps of fault
diagnosis according to the symptoms of engine:
(1) Verify that there is no abnormal behavior with the ECU and malfunction indicator
light (not applicable for car models without setting of malfunction indicator light).
(2) Inspect with the diagnostic tester or flashing light to verify that there is no
malfunction information record.
(3) Inspect the idle speed data of warmed up engine in the electronic control system
with the diagnostic tester and verify that they are normal.
(4) Verify that the malfunction symptom complained by the car owner exists and
locate the exact position of the symptom.
Then carry out the visual inspection: Verify that the grounding point of the wiring
harness is clean and firm.
Verify that the vacuum pipelines have any ruptures or twists together, and whether its
connections are correct.
Verify that the pipeline has any symptom of blockage.
Verify that the air inlet pipeline is flattened or damaged.
Verify that the sealing between the throttle body and the air intake manifold is in a
good condition.
Verify that the high voltage cable of ignition system has any rupture or ageing, and
whether the wire routing is correct.
Verify that the connection of conducting wire is correct and whether the connector is
loose or poorly contacted.
SYMPTOMS OF THE ENGINE
G-62