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