Chery A1 2009 Service Manual page 630

On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
C1200 speed sensor circuit
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 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.
• 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.
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
Diagnostic Procedure
1.
CHECK ABS MODULE DTC
• With the scan tool select: View ABS Data Stream.
• With an assistant driving the vehicle, check the following data stream list items while driving the vehicle over 40
km/h (25 mph).
− Left Front Wheel Speed
− Right Front Wheel Speed
− Left Rear Wheel Speed
− Right Rear Wheel Speed
• With the scan tool, read active DTCs in the ABS module.
Is DTC C1200 present and the Left Front Wheel Speed signal abnormal?
Yes >>
Go to the next step.
No >>
The condition that caused this DTC to set is currently not present (See Diagnostic Help and Intermit-
tent DTC Troubleshooting in Section 12 Brakes for more information).
40
12–
DIAGNOSIS & TESTING
DTC DETECTION
DTC DEFINITION
Left front wheel • Ignition switch:
ON
open or shorted • Vehicle: Running
DTC SET
CONDITION CONDITION
ABS module
detected that the
Left Front wheel
speed sensor input
signal to ABS
module is open or
shorted.
Chery Automobile Co., Ltd.
POSSIBLE CAUSE
• Left Front wheel
speed sensor
• Harness is open or
shorted
• ABS module