Chery A1 2009 Service Manual page 271

Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL
NO.
16
32
33
35
36
40
73
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
P2138
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.
• 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.
164
03–
DIAGNOSIS & TESTING
ITEM
Accelerator pedal
position sensor
Regulated sensor
supply 2
Regulated sensor
supply 1
Ignition switch: ON
Sensor (GND)
Sensor (GND)
Accelerator Pedal
Position Sensor
Regulated sensor
supply 3
DTC DETECTION
DTC DEFINITION
Accelerator pedal Ignition switch ON
position sensor or after engine is
performance started
CONDITION
Engine: Stopped
Accelerator pedal:
Fully released
Engine: Stopped
Accelerator pedal:
Fully depressed
Engine: Stopped
Accelerator pedal:
Fully released
Engine: Stopped
Accelerator pedal:
Fully depressed
DTC SET
CONDITION CONDITION
Rationally incorrect
voltage is sent to
ECM compared with
the signals from
APPS1 and APPS2.
Chery Automobile Co., Ltd.
DATA
(DC VOLTAGE)
0.72 - 0.74 V
3.95 V
- Approximately 5 V
- Approximately 5 V
- Approximately 0 V
- Approximately 0 V
0.36 - 0.37 V
1.97 V
- Approximately 5 V
POSSIBLE CAUSE
• Accelerator pedal
position sensor 1
and 2
• Harness or
connectors
• Electronic throttle
control actuator
(TPS1 and TPS2)
• ECM