Chery Tiggo 2009 Service Manual page 810

Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO.
10
23
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
44
DTC Confirmation Procedure:
Before performing the following procedure, confirm that battery voltage is more than 12 V.
• Turn ignition switch off.
• Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available.
• Turn ignition switch on.
• With the scan tool, record and erase stored DTCs in the ECM.
• Start engine and warm it to normal operating temperature then select view DTC.
• If DTC is detected, go to Diagnostic Procedure - Step 1.
• If the DTC is not detected, the DTC condition is intermittent (See Diagnosis & Testing Diagnostic Help in Sec-
tion 03 Electronic Engine Controls).
NOTE :
Before performing the following procedure, make sure that the ECM ground connection is in good condition.
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
Diagnostic Procedure
1.
CHECK GROUND CONNECTION
• Turn ignition switch off.
• Loosen and retighten ground screws on the body (See Ground Inspection in Section 03 Electronic Engine Con-
trols).
• Inspect the ground connections E-207 and E-208 (See Vehicle Wiring Harness Layout - Engine Room Harness
(With Mitsubishi 2.4L Engine) in Section 16 Wiring).
Is the ground connections OK?
Yes >>
Go to the next step.
No >>
Repair or replace ground connection.
526
03–
DIAGNOSIS & TESTING
ITEM
Ignition coil 1
Ignition coil 2
DTC DETECTION
DTC DEFINITION
• Engine speed: 50
- 4000 RPM
• Except decelerate
Ignition signal
and accelerate
suddenly or
decelerate suddenly
CONDITION
Engine: 3000 RPM
CONDITION CONDITION
The misfire times of
No.1 and No.4 or
No.2 and No.3 is
more than the reset
misfire times of per
1000 RPM.
DATA (DC VOLTAGE)
0.3 - 3.0 V
0.3 - 3.0 V
DTC SET
POSSIBLE CAUSE
• Ignition coil
• Ignition primary
harness or
connectors
• Spark plug and
tension cable
• Cylinder pressure
• ECM
Chery Automobile Co., Ltd.