Infiniti Q45 (FY33). Manual - part 35

SAT559I

Throttle Position Sensor

DESCRIPTION

Throttle position sensor
The throttle position sensor detects the throttle valve position
and sends a signal to the TCM.

Throttle position switch
Consists of a wide open throttle position switch and a closed
throttle position switch.
The wide open throttle position switch sends a signal to the
TCM when the throttle valve is open at least 1/2 of the full
throttle position. The closed throttle position switch sends a
signal to the TCM when the throttle valve is fully closed.

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE

Remarks: Specification data are reference values.

Monitor item

Condition

Specification

Throttle position sensor

Fully-closed throttle

Approximately 0.5V

Fully-open throttle

Approximately 4V

TCM TERMINALS AND REFERENCE VALUE

Remarks: Specification data are reference values.

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

GY/L

Closed throttle
position switch
(in throttle posi-
tion switch)

When releasing accelerator pedal
after warming up engine. (Refer to
“Preparation”, “TCM SELF-DIAG-
NOSTIC PROCEDURE (No Tools)”,
AT-49.)

Battery voltage

When depressing accelerator pedal
after warming up engine. (Refer to
“Preparation”, “TCM SELF-DIAG-
NOSTIC PROCEDURE (No Tools)”,
AT-49.)

W/R

Wide open
throttle position
switch
(in throttle posi-
tion switch)

When depressing accelerator pedal
more than half-way after warming up
engine.

Battery voltage

When releasing accelerator pedal
after warming up engine.

BR/W

Throttle position
sensor
(Power source)

Ignition switch: ON

4.5 - 5.5V

Ignition switch: OFF

L/B

Throttle position
sensor

When depressing accelerator pedal
slowly after warming up engine.
(Voltage rises gradually in response
to throttle position.)

Fully-closed
throttle:

0.5V

Fully-open
throttle:

Throttle position
sensor
(Ground)

—

IDX

TROUBLE DIAGNOSIS FOR DTC P1705

AT-137

ON BOARD DIAGNOSIS LOGIC

Diagnostic trouble code

Malfunction is detected when ...

Check item (Possible cause)

: TP SEN/CIRC A/T

TCM receives an excessively low or
high voltage from the sensor.

Harness or connectors
(The sensor circuit is open or
shorted.)

Throttle position sensor

Throttle position switch

: P1705

TROUBLE DIAGNOSIS FOR DTC P1705

Throttle Position Sensor (Cont’d)

AT-138

SAT014K

SAT971J

SAT014K

SEF949Y

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMA-
TION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.
NOTE
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.

Turn ignition switch “ON” and select “DATA MONITOR”
mode for “A/T” with CONSULT-II.

Apply vacuum to the throttle opener, then check the fol-
lowing. Refer to steps 1 and 2 of “Preparation”, “TCM
SELF-DIAGNOSTIC PROCEDURE (No Tools)”, AT-49.

Accelerator pedal

THRTL POS SEN CLOSED THL/SW

W/O THRL/P

⋅

Fully released

Less than 4.7V

OFF

Partially

depressed

0.1 - 4.6V

OFF

Fully depressed

1.9 - 4.6V

OFF

If the check result is NG, go to “DIAGNOSTIC
PROCEDURE”, AT-140.
If the check result is OK, go to following step.

Turn ignition switch “ON” and select “DATA MONITOR”
mode for “ENGINE” with CONSULT-II.

Start engine and maintain the following conditions for at
least 3 consecutive seconds. Then release accelerator
pedal completely.
VHCL SPEED SE: 10 km/h (6 MPH) or more
THRTL POS SEN: Approximately 3V or less
Selector lever: D position (OD “ON”)

If the check result is NG, go to “DIAGNOSTIC
PROCEDURE”, AT-140.
If the check result is OK, go to following step.

Maintain the following conditions for at least 3 consecu-
tive seconds. Then release accelerator pedal com-
pletely.
VHCL SPEED SE: 10 km/h (6 MPH) or more
Accelerator pedal: Wide open throttle
Selector lever: D position (OD “ON”)

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Follow the procedure “With CONSULT-II”.

IDX

TROUBLE DIAGNOSIS FOR DTC P1705

Throttle Position Sensor (Cont’d)

AT-139

SAT738J

SAT940IA

DIAGNOSTIC PROCEDURE

INSPECTION START

Perform diagnostic test mode II (self-
diagnostic results) for engine control.
Refer to EC section [“Malfunction Indicator
Lamp (MIL)”, “ON BOARD DIAGNOSTIC
SYSTEM DESCRIPTION”].

Check throttle position sen-
sor circuit for engine con-
trol. Refer to EC section
[“Throttle Position Sensor
(DTC: 0403)”, “TROUBLE
DIAGNOSIS FOR DTC
P0120”].

CHECK INPUT SIGNAL.

1. Turn ignition switch to “ON”

position.
(Do not start engine.)

2. Select “TCM INPUT SIGNALS”

in “DATA MONITOR” mode for
“A/T” with CONSULT-II.

3. Read out the value of “THRTL

POS SEN”.
Voltage:

Fully-closed throttle:

Approximately 0.5V

Fully-open throttle:

Approximately 4V

-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------

1. Turn ignition switch to “ON”

position. (Do not start engine.)

2. Check voltage between TCM

terminals

and

while accel-

erator pedal is depressed
slowly.
Voltage:

Fully-closed throttle valve:

Approximately 0.5V

Fully-open throttle valve:

Approximately 4V

(Voltage rises gradually in
response to throttle position.)

Check harness for short or
open between ECM and
TCM regarding throttle
position sensor circuit.
(Main harness)

(Go to next page.)

TROUBLE DIAGNOSIS FOR DTC P1705

Throttle Position Sensor (Cont’d)

AT-140

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