Chery A1 2009 Service Manual page 634

On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
C1202
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 ABS module.
• Cycle the ignition switch from off to on.
• Start the engine and warm it to normal operating temperature.
• Turn the ignition switch off and wait for a few seconds.
• Start the engine. With the scan tool connected to the DLC, drive the vehicle over 40 km/h (25 mph).
NOTE :
Vehicle must be driven above 40 km/h (25 mph) for fault setting conditions to be met.
NOTE :
If a DTC concerning a wheel speed sensor circuit being open or shorted is present, that DTC must be repaired
before continuing.
• With the scan tool select: View ABS Data Stream and DTC.
• 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 12 Brakes for more information).
• Erase all codes and test drive the vehicle to verify the repair is complete.
• This DTC must be active for the results of this test to be valid.
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
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12–
DIAGNOSIS & TESTING
DTC DETECTION
DTC DEFINITION
Left front wheel With the vehicle
speed sensor gap speed above 40
error km/h (25 mph)
DTC SET
CONDITION CONDITION
When the Left Front
wheel speed sensor
input signal to the
Antilock Brake
System (ABS)
module is excessive
variation while
vehicle speed is
above 40 km/h (25
mph), or different
wheel speed signal
during acceleration,
or sensed wheel
speed is different
from other wheels.
Chery Automobile Co., Ltd.
POSSIBLE CAUSE
• Left Front wheel
speed sensor
• Bearing clearance
• ABS module