Infiniti Q45 (FY33). Manual — part 155
SEF152P
COMPONENT INSPECTION
Engine coolant temperature sensor
Check resistance as shown in the figure.
SEF012P
<Reference data>
Temperature °C (°F)
Resistance k
Ω
20 (68)
2.1 - 2.9
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
If NG, replace engine coolant temperature sensor.
GI
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LC
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PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0115
Engine Coolant Temperature Sensor (ECTS)
(Cont’d)
EC-149
Throttle Position Sensor
NOTE: If DTC P0510 (0203) is displayed with DTC P0120, perform TROUBLE DIAGNOSIS FOR DTC
P0510 first (See EC-346.).
COMPONENT DESCRIPTION
The throttle position sensor responds to the accelerator pedal movement. This sensor is a kind of potentiom-
eter which transforms the throttle position into output voltage, and emits the voltage signal to the ECM. In
addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal
to the ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sen-
sor. This one controls engine operation such as fuel cut. The throttle position sensor unit has a built-in “Wide
open and closed throttle position switch”.
SEF121TA
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
THRTL POS SEN
I
Engine: After warming up
I
Ignition switch: ON
(Engine stopped)
I
More than −40.0 kPa (−300 mmHg,
−11.81 inHg) of vacuum is applied to
the throttle opener with a handy
vacuum pump.
Throttle valve: fully closed
0.15 - 0.85V
Throttle valve: fully opened
3.5 - 4.7V
ABSOL TH
⋅
P/S
I
Engine: After warming up
I
Ignition switch: ON
(Engine stopped)
I
More than −40.0 kPa (−300 mmHg,
−11.81 inHg) of vacuum is applied to
the throttle opener with a handy
vacuum pump.
Throttle valve fully closed
0.0%
Throttle valve fully opened
Approx. 88%
TROUBLE DIAGNOSIS FOR DTC P0120
EC-150
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
63
G
Throttle position sensor
signal
Ignition switch “ON” (Warmed-up condition)*
Accelerator pedal fully released
0.15 - 0.85V
Ignition switch “ON”
Accelerator pedal fully depressed
3.5 - 4.7V
98
BR/W
Sensor’s power supply
Ignition switch “ON”
Approximately 5V
129
B
Sensor’s ground
Engine is running. (Warmed-up condition)
Idle speed
0V
*: More than −40.0 kPa (−300 mmHg, −11.81 inHg) of vacuum is applied to the throttle opener with a handy vacuum pump
ON BOARD DIAGNOSIS LOGIC
Diagnostic
Trouble
Code No.
Malfunction is detected when ...
Check Items
(Possible Cause)
P0120
0403
A) An excessively low or high voltage from the sensor is
sent to ECM.*
I
Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I
Throttle position sensor
B) A high voltage from the sensor is sent to ECM under
light load driving condition.
I
Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I
Throttle position sensor
I
Fuel injector
I
Camshaft position sensor
I
Mass air flow sensor
C) A low voltage from the sensor is sent to ECM under
heavy load driving condition.
I
Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I
Intake air leaks
I
Throttle position sensor
*: When this malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
Engine operating condition in fail-safe mode
Condition
Driving condition
Throttle position will be determined based on the
amount of mass air flow and the engine speed.
Therefore, acceleration will be poor.
When engine is idling
Normal
When accelerating
Poor acceleration
Perform “Procedure for malfunction A” first. If the DTC cannot
be confirmed, perform “Procedure for malfunction B”. If there
is no problem on “Procedure for malfunction B”, perform
“Procedure for malfunction C”.
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
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.
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TROUBLE DIAGNOSIS FOR DTC P0120
Throttle Position Sensor (Cont’d)
EC-151
SEF264Y
Procedure for malfunction A
CAUTION:
Always drive vehicle at a safe speed.
TESTING CONDITION:
I
Before performing the following procedure, confirm that
battery voltage is more than 10V at idle.
I
This test may be conducted with the drive wheels lifted in
the shop or by driving the vehicle. If a road test is
expected to be easier, it is unnecessary to lift the vehicle.
1) Turn ignition switch “ON” and select “DATA MONITOR”
mode with CONSULT-II.
2) Start engine and maintain the following conditions for at
least 5 consecutive seconds.
VHCL SPEED SE: More than 4 km/h (2 MPH)
Selector lever: Suitable position except “P” or “N”
position
3) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-155.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
SEF261Y
Procedure for malfunction B
1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Start engine and let it idle for at least 10 seconds. If idle
speed is over 1,100 rpm, maintain the following condi-
tions for at least 10 seconds to keep engine speed
below 1,100 rpm.
Selector lever: Suitable position except “P” or “N”
Brake pedal: depressed
Vehicle speed: 0 km/h (0 MPH)
4) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-156.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
SEF177Y
Procedure for malfunction C
1) Start engine and warm it up to normal operating tem-
perature.
2) Turn ignition switch “OFF” and wait at least 5 seconds.
3) Turn ignition switch “ON”.
4) Select “MANU TRIG” in “DATA MONITOR” mode with
CONSULT-II.
5) Select “THRTL POS SEN” and “ABSOL TH
⋅
P/S” in
“DATA MONITOR” mode with CONSULT-II.
TROUBLE DIAGNOSIS FOR DTC P0120
Throttle Position Sensor (Cont’d)
EC-152
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