2007 INFINITI QX56 Factory Service Manual

steering keyless entry reset audio catalytic converter mirror controls

Page 1649 of 3061

INFINITI QX56 2007 Factory Service Manual EC-566
< SERVICE INFORMATION >
DTC P2122, P2123 APP SENSOR
>>INSPECTION END
7.CHECK INTERMITTENT INCIDENT
Refer to EC-138
.
>>INSPECTION END
Component InspectionINFOID:0000000003532115
ACCELERATOR PE

Page 1650 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P2127, P2128 APP SENSOR
EC-567
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DTC P2127, P2128 APP SENSOR
Component DescriptionINFOID:0000000003532117
The accelerator pedal position senso

DTC P2127, P2128 APP SENSOR
EC-567
< SERVICE INFORMATION >
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DTC P2127, P2128 APP SENSOR
Component DescriptionINFOID:0000000003532117
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 ModeINFOID:0000000003532118
Specification data are reference values.
*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differ from ECM terminal voltage.
On Board Diagnosis LogicINFOID:0000000003532119
These self-diagnoses have the one trip detection logic.
FA I L - S A F E M O D E
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation ProcedureINFOID:0000000003532120
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.
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 4.2 - 4.8V
ACCEL SEN 2*• Ignition switch: ON
(Engine stopped)Accelerator pedal: Fully released 0.5 - 1.0V
Accelerator pedal: Fully depressed 4.2 - 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 position
sensor 2 circuit low inputAn excessively low voltage from the APP
sensor 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) P2128
2128Accelerator pedal position
sensor 2 circuit high inputAn excessively high voltage from the APP
sensor 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.

Page 1651 of 3061

INFINITI QX56 2007 Factory Service Manual EC-568
< SERVICE INFORMATION >
DTC P2127, P2128 APP SENSOR
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8V at idle.
WITH CONSULT-II
1. Turn

Page 1652 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P2127, P2128 APP SENSOR
EC-569
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Wiring DiagramINFOID:0000000003532121
Specification data are reference values and are measured between each t

Page 1653 of 3061

INFINITI QX56 2007 Factory Service Manual EC-570
< SERVICE INFORMATION >
DTC P2127, P2128 APP SENSOR
Diagnosis Procedure
INFOID:0000000003532122
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground scre

Page 1654 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P2127, P2128 APP SENSOR
EC-571
< SERVICE INFORMATION >
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1. Disconnect accelerator pedal position (APP) sensor harness
connector.
2. Turn ignition switch ON.
3. Check

Page 1655 of 3061

INFINITI QX56 2007 Factory Service Manual EC-572
< SERVICE INFORMATION >
DTC P2127, P2128 APP SENSOR
>>INSPECTION END
7.CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3.

Page 1656 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P2127, P2128 APP SENSOR
EC-573
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3. Check voltage between ECM terminals 106 (APP sensor 1 sig-
nal), 98 (APP sensor 2 signal) and ground under

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