Chery Tiggo 2009 Service Manual page 590

Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL
NO.
39
17
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
P0118
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 :
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-207 and E-208 mounting position (See Vehicle Wiring Harness Layout - Engine
Room Harness (With 2.0L Engine) in Section 16 Wiring).
Are the ground connections OK?
Yes >>
Go to the next step.
No >>
Repair or replace ground connections.
306
03–
DIAGNOSIS & TESTING
ITEM
Engine Coolant
Temperature (ECT)
Ignition switch: ON
sensor
Sensor (GND)
DTC DETECTION
DTC DEFINITION
• Ignition switch:
Engine coolant
temperature circuit ON
• Engine: Running
high input
CONDITION
ECT: 59°C
ECT: 78°C
ECT: 90°C
CONDITION CONDITION
Signal output is
above maximum
acceptable range for
a few seconds
continuously.
DATA (DC
VOLTAGE)
Approximately
Approximately
Approximately
- Approximately 0 V
DTC SET
POSSIBLE CAUSE
• ECT
• Harness or
connectors
• ECM
Chery Automobile Co., Ltd.
1.89 V
1.25 V
0.94 V