Voltage - Chery Tiggo 2009 Service Manual

Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO.
17
33
37
73
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
P0102
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 1.6L/1.8L Engine) in Section 16 Wiring).
Is ground connections OK?
Yes >>
Go to the next step.
No >>
Repair or replace ground connections.
58
03–
DIAGNOSIS & TESTING
ITEM
Sensor (GND)
Regulated sensor supply 1
Air flow sensor
Regulated sensor supply 1
DTC DEFINITION
Mass or Volume Air
Ignition switch on or
Flow (MAF) circuit
engine is running
low input
CONDITION
• Engine is running
• Warm-up condition:
78°C
• Idle: 795 RPM
• IAT: 36°C
• IAT signal voltage: 1.88
V
DTC DETECTION
CONDITION
ECM detected that
the input signal is
out of the
acceptable range.
DATA (AVERAGE DC

VOLTAGE)

Approximately 0 V
Approximately 322 kg/h
Approximately 1.39 V
DTC SET
POSSIBLE CAUSE
CONDITION
• MAF sensor
• Intake air leaks
• Harness or
connectors (The
sensor circuit is open
or shorted)
• ECM
Chery Automobile Co., Ltd.
5 V
5 V