Chery Tiggo 2009 Service Manual page 376

Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL
NO.
17
39
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
P0117
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 engine and warm it to normal operating temperature, then select view DTC and data stream.
• 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 03 Electronic Engine Controls for more information.
NOTE :
• Before performing this DTC diagnostic procedure, verify that the engine coolant temperature is normal.
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
92
03–
DIAGNOSIS & TESTING
ITEM
Sensor (GND)
Engine Coolant
Ignition switch: ON
Temperature (ECT)
sensor
DTC DETECTION
DTC DEFINITION
Engine Coolant
Ignition switch on or
Temperature (ECT)
circuit low input
CONDITION
CONDITION
Signal output is
below minimum
acceptable range for
after engine start
a few seconds
continuously.
VOLTAGE)
- Approximately 0 V
ECT: 59°C
ECT: 78°C
ECT: 90°C
DTC SET
POSSIBLE CAUSE
CONDITION
• ECT sensor
• Harness or
connectors
• ECM
Chery Automobile Co., Ltd.
DATA (DC
1.89 V
1.25 V
0.94 V