Chery Tiggo 2009 Service Manual page 331

Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO.
18
28 (With EOBD)
4 (Without EOBD)
36
48 (With EOBD)
1 (Without EOBD)
55
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
P0031
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 and select record and erase data stream and DTC.
• Start engine and warm it up to the normal operating temperature.
• Turn ignition switch off and wait at least 10 seconds.
• Start engine and keep the engine speed 2000 RPM for at least 1 minute.
• Let engine idle for 2 minutes.
• With the scan tool, select view DTCs in the ECM.
• If DTC is detected, go to Diagnostic Procedure - Step 1.
• If the DTC is not detected, the DTC condition is intermittent (See Diagnosis & Testing Diagnostic Help in Sec-
tion 03 Electronic Engine Controls).
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
Chery Automobile Co., Ltd.
DIAGNOSIS & TESTING
ITEM
Upstream oxygen sensor
Downstream oxygen
sensor heating
Sensor (GND)
Upstream oxygen sensor
heating
Downstream oxygen
sensor
DTC DEFINITION
O sensor 1 heater control
2
circuit low
CONDITION
• Engine is running
• Warm-up condition
• Keep the engine speed
2000 RPM
-
• Warm-up condition
• Idle speed
-
• Engine is running
• Warm-up condition
• Keep the engine speed
2000 RPM
DTC DETECTION
CONDITION
Engine is running
DATA (DC VOLTAGE)
Approximately 0.1 V - 0.9
V (change 5 - 8 times in
10 seconds periodically)
-
Approximately 0 V
-
Approximately 100 mV
POSSIBLE CAUSE
• Oxygen sensor
• Harness or connectors
(The sensor circuit is open
or shorted)
• ECM
47
03–
03