sensor INFINITI FX35 2004 Service Manual

DTC P2122, P2123 APP SENSOR
EC-1229
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Revision: 2004 November 2004 FX35/FX45
2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness
connector.
2. Turn ignition switch ON.
3. Check voltage between APP sensor terminal 6 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. 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.
4. CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor terminal 3 and ECM terminal 82.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. 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.
PBIB1548E
Voltage: Approximately 5V
PBIB0914E
Continuity should exist.

EC-1230
[VK45DE]
DTC P2122, P2123 APP SENSOR
Revision: 2004 November 2004 FX35/FX45
6. CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 106 and APP sensor terminal 5.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7. 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.
8. CHECK APP SENSOR
Refer to EC-1253, "
Component Inspection" .
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
9. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform EC-698, "
Accelerator Pedal Released Position Learning" .
3. Perform EC-698, "
Throttle Valve Closed Position Learning" .
4. Perform EC-698, "
Idle Air Volume Learning" .
>>INSPECTION END
10. CHECK INTERMITTENT INCIDENT
Refer to EC-784, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionABS00CDN
ACCELERATOR PEDAL POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 106 (APP sensor 1 sig-
nal), 98 (APP sensor 2 signal) and ground under the following
conditions.Continuity should exist.
Terminal Accelerator pedal Voltage
106
(Accelerator pedal position
sensor 1)Fully released 0.5 - 1.0V
Fully depressed 3.9 - 4.7V
98
(Accelerator pedal position
sensor 2)Fully released 0.15 - 0.60V
Fully depressed 1.95 - 2.40V
MBIB0023E

DTC P2122, P2123 APP SENSOR
EC-1231
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Revision: 2004 November 2004 FX35/FX45
4. If NG, replace accelerator pedal assembly and go to next step.
5. Perform EC-698, "
Accelerator Pedal Released Position Learning" .
6. Perform EC-698, "
Throttle Valve Closed Position Learning" .
7. Perform EC-698, "
Idle Air Volume Learning" .
Removal and InstallationABS00CDO
ACCELERATOR PEDAL
Refer to ACC-3, "ACCELERATOR CONTROL SYSTEM" .

EC-1232
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DTC P2127, P2128 APP SENSOR
Revision: 2004 November 2004 FX35/FX45
DTC P2127, P2128 APP SENSORPFP:18002
Component DescriptionABS00CDP
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.
CONSULT-II Reference Value in Data Monitor ModeABS00CDQ
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 Diagnosis LogicABS00CDR
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
PBIB1741E
MONITOR ITEM CONDITION SPECIFICATION
ACCEL SEN1

Ignition switch: ON
(Engine stopped)Accelerator pedal: Fully released 0.5 - 1.0V
Accelerator pedal: Fully depressed 4.0 - 4.7V
ACCEL SEN2*

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
P2127
2127Accelerator pedal posi-
tion sensor 2 circuit low
inputAn excessively low voltage from the APP sen-
sor 2 is sent to ECM.

Harness or connectors
(APP sensor 2 circuit is open or
shorted.)
(TP sensor circuit is shorted.)

Accelerator pedal position sensor
(Accelerator pedal position sensor 2)

Electric throttle control actuator
(TP sensor 1 and 2) P2128
2128Accelerator pedal posi-
tion sensor 2 circuit high
inputAn excessively high voltage from the APP sen-
sor 2 is sent to ECM.
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.

DTC P2127, P2128 APP SENSOR
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Revision: 2004 November 2004 FX35/FX45
DTC Confirmation ProcedureABS00CDS
NOTE:
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 10V at idle.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 1 second.
4. If DTC is detected, go to EC-1235, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
SEF058Y

EC-1234
[VK45DE]
DTC P2127, P2128 APP SENSOR
Revision: 2004 November 2004 FX35/FX45
Wiring DiagramABS00CDT
TBWM0508E

DTC P2127, P2128 APP SENSOR
EC-1235
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Revision: 2004 November 2004 FX35/FX45
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic ProcedureABS00CDU
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
Refer to EC-791, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
47 LSensor power supply
(Throttle position sensor)[Ignition switch: ON]Approximately 5V
82 B/WSensor ground
(APP sensor 1 / Steering
switch)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
83 G/ORSensor ground
(APP sensor 2)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
90 L/BSensor power supply
(APP sensor 1)[Ignition switch: ON]Approximately 5V
91 GSensor power supply
(APP sensor 2)[Ignition switch: ON]Approximately 5V
98 B/PAccelerator pedal position
sensor 2[Ignition switch: ON]

Engine stopped

Accelerator pedal is fully released0.15 - 0.60V
[Ignition switch: ON]

Engine stopped

Accelerator pedal is fully depressed1.95 - 2.40V
106 R/BAccelerator pedal position
sensor 1[Ignition switch: ON]

Engine stopped

Accelerator pedal is fully released0.5 - 1.0V
[Ignition switch: ON]

Engine stopped

Accelerator pedal is fully depressed3.9 - 4.7V
PBIB2195E

EC-1236
[VK45DE]
DTC P2127, P2128 APP SENSOR
Revision: 2004 November 2004 FX35/FX45
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 voltage between APP sensor terminal 4 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 8.
NG >> GO TO 3.
3. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor terminal 4 and ECM terminal 91.
Refer to Wiring Diagram.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors E211, M41

Harness for open or short between ECM and accelerator pedal position sensor
>> Repair or replace 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.
OK or NG
OK >> GO TO 6.
NG >> Repair short to ground or short to power in harness or connectors.
PBIB1548E
Voltage: Approximately 5V
PBIB0915E
Continuity should exist.
ECM terminal Sensor terminal Reference Wiring Diagram
91 APP sensor terminal 4EC-1234
47 Electric throttle control actuator terminal 1EC-850

DTC P2127, P2128 APP SENSOR
EC-1237
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Revision: 2004 November 2004 FX35/FX45
6. CHECK THROTTLE POSITION SENSOR
Refer to EC-854, "
Component Inspection" .
OK or NG
OK >> GO TO 14.
NG >> GO TO 7.
7. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. Perform EC-698, "
Throttle Valve Closed Position Learning" .
3. Perform EC-698, "
Idle Air Volume Learning" .
>>INSPECTION END
8. CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between 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 10.
NG >> GO TO 9.
9. 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.
10. CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 98 and APP sensor terminal 2.
Refer to Wiring Diagram.
2. 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. Continuity should exist.
Continuity should exist.

EC-1238
[VK45DE]
DTC P2127, P2128 APP SENSOR
Revision: 2004 November 2004 FX35/FX45
12. CHECK APP SENSOR
Refer to EC-1253, "
Component Inspection" .
OK or NG
OK >> GO TO 14.
NG >> GO TO 13.
13. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform EC-698, "
Accelerator Pedal Released Position Learning" .
3. Perform EC-698, "
Throttle Valve Closed Position Learning" .
4. Perform EC-698, "
Idle Air Volume Learning" .
>>INSPECTION END
14. CHECK INTERMITTENT INCIDENT
Refer to EC-784, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionABS00CDV
ACCELERATOR PEDAL POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 106 (APP sensor 1 sig-
nal), 98 (APP sensor 2 signal) and ground under the following
conditions.
4. If NG, replace accelerator pedal assembly and go to next step.
5. Perform EC-698, "
Accelerator Pedal Released Position Learning" .
6. Perform EC-698, "
Throttle Valve Closed Position Learning" .
7. Perform EC-698, "
Idle Air Volume Learning" .
Removal and InstallationABS00CDW
ACCELERATOR PEDAL
Refer to ACC-3, "ACCELERATOR CONTROL SYSTEM" .
Terminal Accelerator pedal Voltage
106
(Accelerator pedal position
sensor 1)Fully released 0.5 - 1.0V
Fully depressed 3.9 - 4.7V
98
(Accelerator pedal position
sensor 2)Fully released 0.15 - 0.60V
Fully depressed 1.95 - 2.40V
MBIB0023E