2008 INFINITI FX35 Service Manual

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Page 2361 of 3924

INFINITI FX35 2008 Service Manual
DTC P2135 TP SENSOREC-1121
< SERVICE INFORMATION > [VK45DE]
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5. Check voltage between ECM terminals 50 (TP sensor 1 signal),
69 (TP sensor 2 signal) and ground under th

Page 2362 of 3924

INFINITI FX35 2008 Service Manual
EC-1122
< SERVICE INFORMATION >[VK45DE]
DTC P2138 APP SENSOR
DTC P2138 APP SENSOR
Component DescriptionINFOID:0000000001327024
The accelerator pedal position sensor is installed on the upper end
of t

EC-1122
< SERVICE INFORMATION >[VK45DE]
DTC P2138 APP SENSOR
DTC P2138 APP SENSOR
Component DescriptionINFOID:0000000001327024
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 accelerato
r pedal is determined by the ECM
receiving the signal from the accelerator pedal positi on sensor. The ECM uses this signal for the engine oper-
ation such as fuel cut.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001327025
Specification data are reference values.
*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage.
On Board Diagn osis LogicINFOID:0000000001327026
This self-diagnosis has the one trip detection logic.
NOTE:
If DTC P2138 is displayed with DTC P0643, first pe rform the trouble diagnosis for DTC P0643. Refer to
EC-1009
.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
PBIB1741E
MONITOR ITEM CONDITION SPECIFICATION
ACCEL SEN 1 Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.5 - 1.0V
Accelerator pedal: Fully depressed 4.0 - 4.8V
ACCEL SEN 2* Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.3 - 1.2V
Accelerator pedal: Fully depressed 3.9 - 4.8V
CLSD THL POS Ignition switch: ON
(Engine stopped) Accelerator pedal:
Fully released ON
Accelerator pedal: Slightly depressed OFF
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2138
2138 Accelerator pedal posi-
tion sensor circuit range/
performance Rationally incorrect voltage is sent to ECM
compared with the sign
als from APP sensor 1
and APP sensor 2. Harness or connector
(APP sensor 1 and 2 circuit is open or
shorted.)
(TP sensor circuit is shorted.)
Accelerator pedal position sensor
(APP sensor 1 and 2)
Electric throttle control actuator (TP sensor 1 and 2)
Engine operating condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10
degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.
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Page 2363 of 3924

INFINITI FX35 2008 Service Manual
DTC P2138 APP SENSOREC-1123
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DTC Confirmation ProcedureINFOID:0000000001327027
NOTE:
If DTC Confirmation Procedure has been previously

Page 2364 of 3924

INFINITI FX35 2008 Service Manual
EC-1124
< SERVICE INFORMATION >[VK45DE]
DTC P2138 APP SENSOR
Wiring Diagram
INFOID:0000000001327028
Specification data are reference values and are measured between each terminal and ground.
CAUTION:

Page 2365 of 3924

INFINITI FX35 2008 Service Manual
DTC P2138 APP SENSOREC-1125
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Diagnosis ProcedureINFOID:0000000001327029
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loos

Page 2366 of 3924

INFINITI FX35 2008 Service Manual
EC-1126
< SERVICE INFORMATION >[VK45DE]
DTC P2138 APP SENSOR
1. Disconnect accelerator pedal position (APP) sensor harness
connector.
2. Turn ignition switch ON.
3. Check voltage between APP sensor t

Page 2367 of 3924

INFINITI FX35 2008 Service Manual
DTC P2138 APP SENSOREC-1127
< SERVICE INFORMATION > [VK45DE]
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Harness connectors E211, M41
Harness for open or short between ECM
and accelerator pedal position sen

DTC P2138 APP SENSOREC-1127
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Harness connectors E211, M41
Harness for open or short between ECM
and accelerator pedal position sensor
>> Repair open circuit.
7.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals.
OK or NG
OK >> GO TO 8.
NG >> Repair short to ground or short to power in harness or connectors.
8.CHECK THROTTLE POSITION SENSOR
Refer to EC-1120, "
Component Inspection".
OK or NG
OK >> GO TO 16.
NG >> GO TO 9.
9.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. Perform EC-663, "
Throttle Valve Closed Position Learning".
3. Perform EC-663, "
Idle Air Volume Learning".
>> INSPECTION END
10.CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor termi nal 3 and ECM terminal 82, APP sensor terminal 1
and ECM terminal 83.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 .DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E211, M41
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.
12.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 106 and APP sensor terminal 5, ECM terminal 98 and APP sensor terminal 2.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
ECM terminal Sensor terminal Reference Wiring Diagram 91 APP sensor terminal 4 EC-1124
47 Electric throttle control actuator terminal 6 E C - 111 7
Continuity should exist.
Continuity should exist.
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3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 2368 of 3924

INFINITI FX35 2008 Service Manual
EC-1128
< SERVICE INFORMATION >[VK45DE]
DTC P2138 APP SENSOR
OK or NG
OK >> GO TO 14.
NG >> GO TO 13.
13.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E211, M41
Harness for o

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