Chery Tiggo 2009 Service Manual page 406

Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO.
6
7
27
47
ECM TERMINAL NO.
17
33
37
73
ECM TERMINAL NO.
37
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
P0171
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.
122
03–
DIAGNOSIS & TESTING
ITEM
Injector 2
Injector 3
Injector 1
Injector 4
ITEM
Sensor (GND)
Regulated sensor supply 1
Air flow sensor (1.8L)
Regulated sensor supply 1
ITEM
Manifold Absolute
Pressure (MAP) sensor
(1.6L)
DTC DEFINITION
Fuel trim system too
lean
CONDITION
• Idle
• Engine is running
• Warm-up condition
• Accelerate suddenly
CONDITION
• Engine is running
• Warm-up condition:
78°C
• Idle: 795 RPM
• IAT: 36°C
• IAT signal voltage: 1.88
V
CONDITION
• Engine running: Idle
• Press accelerator pedal
slowly
• Engine running: 2000
RPM
• Press accelerator pedal
quickly
DTC DETECTION
CONDITION
Engine is running compensation is too
large (The mixture
ratio is too lean).
DATA (AVERAGE DC
VOLTAGE)
Voltage: 11 - 14 V
DATA (AVERAGE DC
VOLTAGE)
Approximately 322 kg/h
Approximately 1.39 V
DATA (AVERAGE DC
VOLTAGE)
Approximately 1.3 V
Approximately 1.5 V
Up to Approximately 4 V
(instantaneous)
DTC SET
POSSIBLE CAUSE
CONDITION
• Intake air leaks
• Air flow sensor
• Fuel injector
• Exhaust gas leaks
The amount of
• Incorrect fuel
mixture ratio
pressure
• lack of fuel
• Incorrect PCV
hose connection
• Upstream O
sensor
• ECM
Chery Automobile Co., Ltd.
0 V
5 V
5 V
2