Chery A1 2009 - Page 898

On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO. DTC DEFINITION
DTC DETECTION
CONDITION
DTC SET
CONDITION
POSSIBLE CAUSE
B3042
W-line short circuit
to ground
Ignition switch: ON
The Immobilizer
control module
detects a short
ground condition on
the W-Line for at
least 3 seconds.
• Harness or
connectors
• Immobilizer control
module
• ECM
B3043
W-Line short circuit
to battery
The Immobilizer
control module
detects a short
battery condition on
the W-Line for at
least 3 seconds.
• Harness or
connectors
• Immobilizer control
module
• ECM
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, view and erase stored DTCs in Immobilizer control module.
• Try to start the engine.
• Turn ignition switch off, and wait a few seconds, then turn the ignition switch on.
• With the scan tool, view active DTCs in the Immobilizer control module.
• 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 15 Body & Accessories 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 15 Body & Accessories).
• Inspect ground connection C-202 mounting position (See Vehicle Wiring Harness Layout - Main Harness in
Section 16 Wiring).
Is the ground connection OK?
Yes
>> Go to the next step.
No
>> Repair or replace ground harness or connections.
2.
CHECK IMMOBILIZER CONTROL MODULE DTC
• With the scan tool, view DTCs in the Immobilizer control module.
• Refer to DTC confirmation procedure.
Is the warning light flashing and DTC B3042 or B3043 present?
Yes
>> Go to the next step.
No
>> The conditions that caused this code to set are not present at this time (See Diagnostic Help in Sec-
tion 15 Body & Accessories).
DIAGNOSIS & TESTING
15
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Chery Automobile Co., Ltd.