Chery Tiggo 2009 Service Manual page 783

Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO.
73
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
22
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 and data stream.
• If the DTC is detected, the DTC condition is current. Go to Diagnostic Procedure - Step 1.
• If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou-
bleshooting in Section 03 Electronic Engine Controls for more information.
NOTE :
Before performing the following procedure, make sure that the ECM 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 connection E-208 (See Vehicle Wiring Harness Layout - Engine Room Harness (With Mit-
subishi 2.4L Engine) in Section 16 Wiring).
Is the ground connections OK?
Yes >>
Go to the next step.
No >>
Repair or replace ground connection.
Chery Automobile Co., Ltd.
DIAGNOSIS & TESTING
ITEM
Crankshaft Position (CKP)
sensor
DTC DETECTION
DTC DEFINITION
CKP sensor
CONDITION
Ignition switch: ON
Engine: Not cranking
Engine: Cranking
Engine: Idle
CONDITION CONDITION
Signal output is no
variance for 4
Crank engine seconds
continuously (no
pulse signal).
DATA (DC Voltage)
4.8 - 5.2 V
0.4 - 4.0 V
1.5 - 2.5 V
DTC SET
POSSIBLE CAUSE
• CKP sensor
• Harness or
connectors
• Signal plate gear
tooth
• ECM
03
499
03–