Infiniti G37 Coupe. Manual — part 570
P2122, P2123 APP SENSOR
EC-461
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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>> GO TO 2.
2.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
EC-18, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
>> GO TO 3.
3.
PERFORM IDLE AIR VOLUME LEARNING
EC-19, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
>> END
EC-462
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P2127, P2128 APP SENSOR
P2127, P2128 APP SENSOR
Description
INFOID:0000000001911130
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometers which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the accelerator pedal and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the accelerator pedal from
these signals and controls the throttle control motor based on these
signals.
Idle position of the accelerator pedal is determined by the ECM
receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-
ation such as fuel cut.
DTC Logic
INFOID:0000000001734285
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and let it idle for 1 second.
2.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
PBIB1741E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P2127
Accelerator pedal posi-
tion sensor 2 circuit low
input
An excessively low voltage from the APP sen-
sor 2 is sent to ECM.
• Harness or connectors
(APP sensor 2 circuit is open or shorted.)
[CKP sensor (POS) circuit is shorted.]
(EVAP control system pressure sensor
circuit is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
• Accelerator pedal position sensor (APP
sensor 2)
(Brake booster pressure sensor circuit is
shorted)
• Crankshaft position sensor (POS)
• EVAP control system pressure sensor
• Refrigerant pressure sensor
• Brake booster pressure sensor
P2128
Accelerator pedal posi-
tion sensor 2 circuit high
input
An excessively high voltage from the APP sen-
sor 2 is sent to ECM.
P2127, P2128 APP SENSOR
EC-463
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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Diagnosis Procedure
INFOID:0000000001734286
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection M95. Refer to Ground Inspection in
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1.
Disconnect accelerator pedal position (APP) sensor harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between APP sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 3.
3.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between APP sensor harness connector and ECM harness connector.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M6, E106
• Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit.
5.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal?
YES
>> GO TO 6.
APP sensor
Ground
Voltage
Connector
Terminal
E112
6
Ground
Approx. 5V
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E112
6
M107
103
Existed
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F101
45
Brake booster pressure sensor
E48
1
46
CKP sensor (POS)
F2
1
M107
103
APP sensor
E112
6
107
EVAP control system pressure sensor
B30
3
111
Refrigerant pressure sensor
E77
3
EC-464
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P2127, P2128 APP SENSOR
NO
>> Repair short to ground or short to power in harness or connectors.
6.
CHECK COMPONENTS
Check the following.
• Crankshaft position sensor (POS) (Refer to
EC-267, "Component Inspection"
• Brake booster pressure sensor (Refer to
EC-352, "Component Inspection"
• EVAP control system pressure sensor (Refer to
EC-306, "Component Inspection"
.)
• Refrigerant pressure sensor (Refer to
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace malfunctioning component.
7.
CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between APP sensor harness connector and ECM harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M6, E106
• Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check the continuity between APP sensor harness connector and ECM harness connector.
2.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M6, E106
• Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
11.
CHECK APP SENSOR
EC-465, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> GO TO 12.
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E112
2
M107
104
Existed
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E112
1
M107
98
Existed
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