2005 INFINITI QX4 Factory Service Manual

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Page 1777 of 3419

INFINITI QX4 2005 Factory Service Manual EC-586Revision: October 2005
DTC P1805 BRAKE SWITCH
2005 QX56
DTC P1805 BRAKE SWITCHPFP:25320
DescriptionUBS00HBX
Brake switch signal is applied to the ECM through the stop lamp switch when the brake

Page 1778 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1805 BRAKE SWITCH
EC-587
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Revision: October 20052005 QX56
Wiring DiagramUBS00HC1
BBWA1705E

Page 1779 of 3419

INFINITI QX4 2005 Factory Service Manual EC-588Revision: October 2005
DTC P1805 BRAKE SWITCH
2005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when m

Page 1780 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1805 BRAKE SWITCH
EC-589
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Revision: October 20052005 QX56
3. DETECT MALFUNCTIONING PART
Check the following.
Harness connectors M31, E152
Fuse block (J/B) connector M60

Page 1781 of 3419

INFINITI QX4 2005 Factory Service Manual EC-590Revision: October 2005
DTC P1805 BRAKE SWITCH
2005 QX56
Component InspectionUBS00HC3
STOP LAMP SWITCH
1. Disconnect stop lamp switch harness connector.
2. Check continuity between stop lamp swit

Page 1782 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P2122, P2123 APP SENSOR
EC-591
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Revision: October 20052005 QX56
DTC P2122, P2123 APP SENSORPFP:18002
Component DescriptionUBS00HC4
The accelerator pedal position sensor is

DTC P2122, P2123 APP SENSOR
EC-591
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Revision: October 20052005 QX56
DTC P2122, P2123 APP SENSORPFP:18002
Component DescriptionUBS00HC4
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 ModeUBS00HC5
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 LogicUBS00HC6
These self-diagnoses have the one trip detection logic.
NOTE:
If DTC P2122 or P2123 is displayed with DTC P1229, first perform the trouble diagnosis for DTC P1229.
Refer to EC-454, "
DTC P1229 SENSOR POWER SUPPLY" .
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 4.2 - 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
P2122
2122Accelerator pedal position
sensor 1 circuit low inputAn excessively low voltage from the APP sen-
sor 1 is sent to ECM.
Harness or connectors
(The APP sensor 1 circuit is open or
shorted.)
Accelerator pedal position sensor
(Accelerator pedal position sensor 1) P2123
2123Accelerator pedal position
sensor 1 circuit high inputAn excessively high voltage from the APP sen-
sor 1 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 1783 of 3419

INFINITI QX4 2005 Factory Service Manual EC-592Revision: October 2005
DTC P2122, P2123 APP SENSOR
2005 QX56
DTC Confirmation ProcedureUBS00HC7
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF

Page 1784 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P2122, P2123 APP SENSOR
EC-593
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Revision: October 20052005 QX56
Wiring DiagramUBS00HC8
BBWA1706E

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