Chery A1 2009 - Page 150

Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO. ITEM CONDITION DATA (DC VOLTAGE)
18 Upstream O
2
sensor
Engine is running
Warm-up condition
Keep the engine speed
2000 RPM
Approximately 0.1 V - 0.9
V (change 5 - 8 times in
10 seconds periodically)
28
Downstream O
2
sensor
heating
- -
36 Sensor (GND)
Warm-up condition
Idle speed
Approximately 0 V
48
Upstream O
2
sensor
heating
- -
55 Downstream O
2
sensor
Engine is running
Warm-up condition
Keep the engine speed
2000 RPM
Approximately 100 mV
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO. DTC DEFINITION
DTC DETECTION
CONDITION
POSSIBLE CAUSE
P0031
O
2
sensor 1 heater control
circuit low
Engine is running
• Oxygen sensor
• Harness or connectors
• ECM
P0032
O
2
sensor 1 heater control
circuit high
• Oxygen sensor
• 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.
• Turn ignition switch off and wait at least 10 seconds.
• Start the 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 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.
DIAGNOSIS & TESTING
03
03–43
Chery Automobile Co., Ltd.