Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO. ITEM CONDITION X-431 DATA STREAM
46 Canister control valve Engine: Running 0 % - 99.9 %
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO. DTC DEFINITION
DTC DETECTION
CONDITION
DTC SET
CONDITION
POSSIBLE CAUSE
P0444
Evaporative (EVAP)
emission system
purge control valve
circuit open
Engine is running
ECM detected that
the improper voltage
signal is sent to
ECM.
• EVAP canister
control
• Harness or
connectors
• 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, 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.
DIAGNOSIS & TESTING
03–136
Chery Automobile Co., Ltd.
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