Chery A1 2009 Service Manual page 142

Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO.
15
34
79
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
P0016
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 the engine and warm it to normal operating temperature.
• With the scan tool, select view DTCs in the ECM.
• If the DTC is detected, the 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 :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
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-801 and E-802 mounting positions (See Vehicle Wiring Harness Layout - ECM
Control Harness in Section 16 Wiring).
Are the ground connections OK?
Yes >>
Go to the next step.
No >>
Repair or replace ground harness or connections.
Chery Automobile Co., Ltd.
DIAGNOSIS & TESTING
ITEM
Crankshaft Position (CKP)
sensor
Camshaft Position (CMP)
sensor
DTC DETECTION
DTC DEFINITION
Camshaft position-
Crankshaft position Engine is running
correlation error
CONDITION
• Ignition switch: ON
• Engine: Not cranking
• Ignition switch: ON
• Engine: Not cranking
DTC SET
CONDITION CONDITION
ECM detected that
the CMP sensor is
out of phase with
CKP sensor.
DATA (AVERAGE DC
VOLTAGE)
Approximately 3 V
Approximately 10 V
POSSIBLE CAUSE
• CMP sensor
• CKP sensor
• Harness or
connectors
• Camshaft signal
plate
• Crankshaft signal
plate
• Timing
misalignment
• ECM
35
03–
03