2009 NISSAN LATIO Service Repair Manual

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Page 2553 of 4331

NISSAN LATIO 2009 Service Repair Manual DTC P0122, P
0123 TP SENSOR
EC-1197
< SERVICE INFOMATION >
[MR TYPE 2] C
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DTC P0122, P0123 TP SENSOR
Component Description INFOID:0000000004500029
Electric throttle cont

DTC P0122, P
0123 TP SENSOR
EC-1197
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DTC P0122, P0123 TP SENSOR
Component Description INFOID:0000000004500029
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometers which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. In addition,
these sensors detect the opening and closing speed of the throttle
valve and feed the voltage signals to the ECM. The ECM judges the
current opening angle of the throttle valve from these signals and the
ECM controls the throttle control motor to make the throttle valve
opening angle properly in response to driving condition.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004500030
Specification data are reference values.
*: Throttle position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.
On Board Diagnosis Logic INFOID:0000000004500031
These self-diagnoses have the on e trip detection logic.
NOTE:
If DTC P0122 or P0123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to EC-1396 .
FAIL-SAFE MODE When the malfunction is detected, ECM ent ers fail-safe mode and the MIL lights up.
DTC Confirmation Procedure INFOID:0000000004500032
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, 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 8V at idle.
1. Start engine and let it idle for 1 second.
2. Check DTC.
3. If DTC is detected, go to EC-1199, " Diagnosis Procedure " . PBIB0145E
MONITOR ITEM CONDITION SPECIFICATION
TP SEN 1-B1
TP SEN 2-B1* • Ignition switch: ON
(Engine stopped)
• Shift lever: D (A/T, CVT),
1st (M/T) Accelerator pedal: Fully released More than 0.36V
Accelerator pedal: Fully depressed Less than 4.75V DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0122
0122 Throttle position sensor
2 circuit low input An excessively low voltage from the TP sensor
2 is sent to ECM. • Harness or connectors
(TP sensor 2 circuit is open or shorted.)
• Electric throttle control actuator (TP sensor 2)
P0123
0123 Throttle position sensor
2 circuit high input An excessively high voltage from the TP sensor
2 is sent to ECM. Engine operation 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 2554 of 4331

NISSAN LATIO 2009 Service Repair Manual EC-1198< SERVICE INFOMATION >
[MR TYPE 2]
DTC P0122, P0123 TP SENSOR
Wiring Diagram INFOID:0000000004500033
Specification data are reference values and are measured between each terminal and ground.
C

Page 2555 of 4331

NISSAN LATIO 2009 Service Repair Manual DTC P0122, P
0123 TP SENSOR
EC-1199
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[MR TYPE 2] C
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Diagnosis Procedure
INFOID:00000000045000341.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OF

Page 2556 of 4331

NISSAN LATIO 2009 Service Repair Manual EC-1200< SERVICE INFOMATION >
[MR TYPE 2]
DTC P0122, P0123 TP SENSOR
1. Disconnect electric throttle control actuator (1) harness connec- tor.
- : Vehicle front
2. Turn ignition switch ON.
3. Check vo

Page 2557 of 4331

NISSAN LATIO 2009 Service Repair Manual DTC P0122, P
0123 TP SENSOR
EC-1201
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>>
INSPECTION END 7.
CHECK INTERMITTENT INCIDENT
Refer to EC-1138 .
>> INSPECTION END
Component

Page 2558 of 4331

NISSAN LATIO 2009 Service Repair Manual EC-1202< SERVICE INFOMATION >
[MR TYPE 2]
DTC P0125 ECT SENSOR
DTC P0125 ECT SENSOR
Component Description INFOID:0000000004501093
The engine coolant temperature sensor is used to detect the engine
coo

EC-1202< SERVICE INFOMATION >
[MR TYPE 2]
DTC P0125 ECT SENSOR
DTC P0125 ECT SENSOR
Component Description INFOID:0000000004501093
The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The elec trical resistance of the ther-
mistor decreases as temperature increases.

*: This data is reference value and is measured between ECM terminal 38 (Engine
coolant temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring in put/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground ot her than ECM terminals, such as the ground.
On Board Diagn osis Logic INFOID:0000000004500038
NOTE:
• If DTC P0125 is displayed with P0117 or P0118, firs t perform the trouble diagnosis for DTC P0117 or P0118.
Refer to EC-1193, " DTC Confirmation Procedure " .
• If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to EC-1202," DTC Confirmation Procedure " .
DTC Confirmation Procedure INFOID:0000000004500039
CAUTION:
Be careful not to overheat engine.
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-III.
3. Check that “COOLAN TEMP/S” is above 10 °C (50 °F). SEF594K
Engine coolant temperature
°C ( °F) Voltage* V Resistance k
Ω
–10 (14) 4.4 7.0 - 11.4 20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260 SEF012P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0125
0125 Insufficient engine cool-
ant temperature for
closed loop fuel control • Voltage sent to ECM from the sensor is not
practical, even when some time has passed
after starting the engine.
• Engine coolant temperature is insufficient for closed loop fuel control. • Harness or connectors
(High resistance in the circuit)
• Engine coolant temperature sensor
• Thermostat

Page 2559 of 4331

NISSAN LATIO 2009 Service Repair Manual DTC P0125 ECT SENSOR
EC-1203
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If it is above 10
°C (50 °F), the test result will be OK.
If it is below 10 °C (50 °F), go to follow

Page 2560 of 4331

NISSAN LATIO 2009 Service Repair Manual EC-1204< SERVICE INFOMATION >
[MR TYPE 2]
DTC P0125 ECT SENSOR
Component Inspection INFOID:0000000004501098
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperatur

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