Infiniti EX35. Manual — part 672
EC-430
< COMPONENT DIAGNOSIS >
[VQ35HR]
P2138 APP SENSOR
P2138 APP SENSOR
Description
INFOID:0000000003133609
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:0000000003133610
DTC DETECTION LOGIC
NOTE:
If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
PBIB1741E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P2138
Accelerator pedal posi-
tion sensor circuit range/
performance
Rationally incorrect voltage is sent to ECM
compared with the signals from APP sensor 1
and APP sensor 2.
• Harness or connectors
(APP sensor 2 circuit is open or shorted.)
[CKP sensor (POS) circuit is shorted.]
[CMP sensor (PHASE) (bank 2) circuit is
shorted.]
[EVT control position sensor (bank 2) cir-
cuit is shorted.]
(Battery current sensor circuit is shorted.)
(EVAP control system pressure sensor
circuit is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
• Accelerator pedal position sensor (APP
sensor 2)
• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE)
(bank 2)
• Exhaust valve timing control position sen-
sor (bank 2)
• Battery current sensor
• EVAP control system pressure sensor
• Refrigerant pressure sensor
P2138 APP SENSOR
EC-431
< COMPONENT DIAGNOSIS >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
1.
Start engine and let it idle for 1 second.
2.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000003133611
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 1 POWER SUPPLY CIRCUIT
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 4.
NO
>> GO TO 3.
3.
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.
4.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch ON.
2.
Check the voltage between APP sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 5.
5.
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?
APP sensor
Ground
Voltage (V)
Connector
Terminal
E112
5
Ground
Approx. 5
APP sensor
Ground
Voltage (V)
Connector
Terminal
E112
6
Ground
Approx. 5
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E112
6
M107
103
Existed
EC-432
< COMPONENT DIAGNOSIS >
[VQ35HR]
P2138 APP SENSOR
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
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.
7.
CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair short to ground or short to power in harness or connectors.
8.
CHECK COMPONENTS
Check the following.
• Crankshaft position sensor (POS) (Refer to
EC-255, "Component Inspection"
• Camshaft position sensor (PHASE) (bank 2) (Refer to
EC-260, "Component Inspection"
• Exhaust valve timing control position sensor (bank 2) (Refer to
EC-348, "Component Inspection"
.)
• Battery current sensor (Refer to
EC-379, "Component Inspection"
.)
• EVAP control system pressure sensor (Refer to
EC-296, "Component Inspection"
.)
• Refrigerant pressure sensor (Refer to
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace malfunctioning component.
9.
CHECK APP SENSOR 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 11.
NO
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F101
46
CKP sensor (POS)
F2
1
F102
64
CMP sensor (PHASE) (bank 2)
F18
1
EVT control position sensor (bank 2)
F19
1
Battery current sensor
E21
1
M107
103
APP sensor
E112
6
107
EVAP control system pressure sensor
B252
3
111
Refrigerant pressure sensor
E77
3
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E112
4
M107
100
Existed
2
104
P2138 APP SENSOR
EC-433
< COMPONENT DIAGNOSIS >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
• 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 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 13.
NO
>> GO TO 12.
12.
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.
13.
CHECK APP SENSOR
EC-433, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> GO TO 14.
14.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace accelerator pedal assembly.
2.
Go to
EC-434, "Special Repair Requirement"
.
>> INSPECTION END
15.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000003133612
1.
CHECK ACCELERATOR PEDAL POSITION SENSOR
1.
Turn ignition switch OFF.
2.
Reconnect all harness connectors disconnected.
3.
Turn ignition switch ON.
4.
Check the voltage ECM harness connector terminals as follows.
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E112
3
M107
97
Existed
1
98
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