Chery Tiggo 2009 Service Manual page 608

Diagnostic Procedure
1.
CHECK GROUND CONNECTIONS
• Turn ignition switch off.
• Loosen and retighten ground screws on the body (See Ground Inspection in Section 03 Electronic Engine Con-
trols).
• Inspect ground connections E-207 and E-208 mounting position (See Vehicle Wiring Harness Layout - Engine
Room Harness (With 2.0L Engine) in Section 16 Wiring).
Are the ground connections OK?
Yes >>
Go to the next step.
No >>
Repair or replace ground harness or connections.
2.
CHECK O SENSOR ELECTRICAL CONNECTOR
2
• Disconnect the O
sensor (1) electrical connector.
2
• Inspect the electrical connector for damage.
Is the electrical connector OK?
Yes >>
Go to the next step.
No >>
Repair or replace the electrical connector
as necessary.
3.
CHECK O SENSOR GROUND CIRCUIT
2
• Disconnect ECM harness connector.
• Check harness continuity between ECM terminal 18 and O
• Continuity should exist.
• Check harness for an open and short to power supply circuit.
Is the check result normal?
Yes >>
Go to the next step.
No >>
Repair or replace circuit for an open or short to power in harness or connectors.
4.
CHECK O SENSOR INPUT SIGNAL CIRCUIT FOR AN OPEN AND SHORT
2
• Check harness continuity between ECM terminal and O
COMPONENT
TERMINAL
324
03–
DIAGNOSIS & TESTING
sensor terminal 4.
2
sensor terminal as follows.
2
ECM
18
UPSTREAM O SENSOR
2
4
Chery Automobile Co., Ltd.
BESM030017