2008 NISSAN LATIO engine

DTC P1574 ASCD VEHICLE SPEED SENSOR
EC-447
< SERVICE INFORMATION >
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DTC P1574 ASCD VEHICLE SPEED SENSOR
Component DescriptionINFOID:0000000001702965
The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from combina-
tion meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD
control. Refer to EC-28
for ASCD functions.
On Board Diagnosis LogicINFOID:0000000001702966
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
•If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-143
.
•If DTC P1574 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer
to EC-145
.
•If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
to EC-391
.
•If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-397
.
DTC Confirmation ProcedureINFOID:0000000001702967
CAUTION:
Always drive vehicle at a safe speed.
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.
TESTING CONDITION:
Step 3 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.
WITH CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Drive the vehicle at more than 40 km/h (25MPH).
4. If DTC is detected, go to EC-448, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC No.Trouble Diagnosis
NameDTC Detecting Condition Possible Cause
P1574
1574ASCD vehicle speed
sensorECM detects a difference between two vehicle
speed signals is out of the specified range.• Harness or connectors
(CAN communication line is open or shorted.)
• Harness or connectors
(Combination meter circuit is open or shorted.)
• TCM (A/T and CVT models)
• Combination meter
• Wheel sensor
•ECM
SEF058Y

DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)
EC-449
< SERVICE INFORMATION >
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DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)
DescriptionINFOID:0000000001702969
ECM receives turbine revolution sensor signal from TCM through CAN communication line. ECM uses this
signal for engine control.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000001702970
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001702971
NOTE:
•If DTC P1715 is displayed with DTC U1000, U1001 first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-143
.
•If DTC P1715 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer
to EC-145
.
•If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335. Refer
to EC-295
.
•If DTC P1715 is displayed with DTC P0340 first perform the trouble diagnosis for DTC P0340.
Refer to EC-302
.
•If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-397
.
The MIL will not lights up for this diagnosis.
Diagnosis ProcedureINFOID:0000000001702972
1.CHECK DTC WITH TCM
Check DTC with TCM. Refer to AT- 3 6
.
OK or NG
OK >> GO TO 2.
NG >> Perform trouble shooting relevant to DTC indicated.
2.REPLACE TCM
Replace TCM. Refer to AT- 3 9
.
>>INSPECTION END
MONITOR ITEM CONDITION SPECIFICATION
I/P PULLY SPD • Vehicle speed: More than 20 km/h (12MPH)Almost the same speed as the
tachometer indication
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1715
1715Input speed sensor
(Turbine revolution sen-
sor)
(TCM output)Turbine revolution sensor signal is differ-
ent from the theoretical value calculated
by ECM from revolution sensor signal and
engine rpm signal.• Harness or connectors
(CAN communication line is open or shorted)
• Harness or connectors
(Turbine revolution sensor circuit is open or
shorted)
•TCM

EC-450
< SERVICE INFORMATION >
DTC P1715 INPUT SPEED SENSOR (PRIMARY SPEED SENSOR)
DTC P1715 INPUT SPEED SENSOR (PRIMARY SPEED SENSOR)
DescriptionINFOID:0000000001702973
ECM receives primary speed sensor signal from TCM through CAN communication line.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000001702974
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001702975
NOTE:
•If DTC P1715 is displayed with DTC U1000 or U1001 first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-143
.
•If DTC P1715 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer
to EC-145
.
•If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335. Refer
to EC-295
.
•If DTC P1715 is displayed with DTC P0340 first perform the trouble diagnosis for DTC P0340.
Refer to EC-302
.
•If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-397
.
The MIL will not light up for this diagnosis.
DTC Confirmation ProcedureINFOID:0000000001702976
CAUTION:
Always drive vehicle at a safe speed.
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.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine.
4. Drive vehicle at a speed of more than 50 km/h (31 MPH) for at
least 5 seconds.
5. If 1st trip DTC is detected, go to EC-451, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-II” above.
MONITOR ITEM CONDITION SPECIFICATION
I/P PULLY SPD • Vehicle speed: More than 20 km/h (12MPH)Almost the same speed as the
tachometer indication
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1715
1715Input speed sensor
(Primary speed sensor)
(TCM output)Primary speed sensor signal is different
from the theoretical value calculated by
ECM from secondary speed sensor signal
and engine rpm signal.• Harness or connectors
(CAN communication line is open or shorted)
• Harness or connectors
(Primary speed sensor circuit is open or short-
ed)
•TCM
PBIB2673E

EC-452
< SERVICE INFORMATION >
DTC P1805 BRAKE SWITCH
DTC P1805 BRAKE SWITCH
DescriptionINFOID:0000000001702978
Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed.
This signal is used mainly to decrease the engine speed when the vehicle is driving.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000001702979
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001702980
The MIL will not light up for this self-diagnosis.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters in fail-safe mode.
DTC Confirmation ProcedureINFOID:0000000001702981
WITH CONSULT-II
1. Turn ignition switch ON.
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the DTC with CONSULT-II.
4. Select “DATA MONITOR” mode with CONSULT-II.
5. If 1st trip DTC is detected, go to EC-454, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-II” above.
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW • Ignition switch: ONBrake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1805
1805Brake switchA brake switch signal is not sent to ECM for
extremely long time while the vehicle is driv-
ing.• Harness or connectors
(Stop lamp switch circuit is open or shorted.)
• Stop lamp switch
Engine operation condition in fail-fail safe mode
ECM controls the electric throttle control actuator by regulating the throttle opening to a small range.
Therefore, acceleration will be poor.
Vehicle condition Driving condition
Engine: Idling Normal
Accelerating Poor acceleration
PBIB1952E

EC-456
< SERVICE INFORMATION >
DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
Component DescriptionINFOID:0000000001702985
Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle
control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends
an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition
switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not
provided to the ECM.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000001702986
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001702987
These self-diagnoses have one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation ProcedureINFOID:0000000001702988
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.
PROCEDURE FOR DTC P2100
With CONSULT-II
1. Turn ignition switch ON and wait at least 2 seconds.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 5 seconds.
4. If DTC is detected, go to EC-459, "
Diagnosis Procedure".
MONITOR ITEM CONDITION SPECIFICATION
THRTL RELAY • Ignition switch: ON ON
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2100
2100Throttle control motor
relay circuit openECM detects a voltage of power source for
throttle control motor is excessively low.• Harness or connectors
(Throttle control motor relay circuit is
open)
• Throttle control motor relay
P2103
2103Throttle control motor
relay circuit shortECM detects the throttle control motor relay is
stuck ON.• Harness or connectors
(Throttle control motor relay circuit is
shorted)
• Throttle control motor relay
Engine operating condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return
spring.
SEF058Y

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
EC-459
< SERVICE INFORMATION >
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Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis ProcedureINFOID:0000000001702990
1.CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Check voltage between ECM terminal 15 and ground with CON-
SULT-II or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2.CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E46.
3. Check continuity between ECM terminal 15 and IPDM E/R terminal 46.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
1LThrottle control motor
(Open)[Ignition switch: ON]
• Engine stopped
• Shift lever: D (A/T, CVT), 1st (M/T)
• Accelerator pedal: Fully depressedApproximately 3.2V
2SBThrottle control motor power
supply[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
4 P Throttle control motor (Close)[Ignition switch: ON]
• Engine stopped
• Shift lever: D (A/T, CVT), 1st (M/T)
• Accelerator pedal: Fully releasedApproximately 1.8V
15 Y Throttle control motor relay[Ignition switch: OFF]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]0 - 1.0V
PBIA8150J
PBIA8149J
Voltage: Battery voltage
PBIA9569J
Continuity should exist.

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
EC-461
< SERVICE INFORMATION >
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DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
DescriptionINFOID:0000000001702991
NOTE:
If DTC P2101 is displayed with DTC P2100 or P2119, first perform the trouble diagnosis for DTC P2100
or P2119. Refer to EC-456
or EC-472.
Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc.
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feed-
back to the ECM to control the throttle control motor to make the throttle valve opening angle properly in
response to driving condition.
On Board Diagnosis LogicINFOID:0000000001702992
This self-diagnosis has the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation ProcedureINFOID:0000000001702993
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V when engine
is running.
WITH CONSULT-II
1. Turn ignition switch ON and wait at least 2 seconds.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 5 seconds.
4. If DTC is detected, go to EC-463, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2101
2101Electric throttle control
performanceElectric throttle control function does not oper-
ate properly.• Harness or connectors
(Throttle control motor circuit is open or
shorted)
• Electric throttle control actuator
Engine operating condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return
spring.
SEF058Y

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
EC-463
< SERVICE INFORMATION >
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Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis ProcedureINFOID:0000000001702995
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screw on the body.
Refer to EC-142, "
Ground Inspection".
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
1LThrottle control motor
(Open)[Ignition switch: ON]
• Engine stopped
• Shift lever: D (A/T, CVT), 1st (M/T)
• Accelerator pedal: Fully depressedApproximately 3.2V
2SBThrottle control motor power
supply[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
4 P Throttle control motor (Close)[Ignition switch: ON]
• Engine stopped
• Shift lever: D (A/T, CVT), 1st (M/T)
• Accelerator pedal: Fully releasedApproximately 1.8V
15 Y Throttle control motor relay[Ignition switch: OFF]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]0 - 1.0V
PBIA8150J
PBIA8149J
:Vehicle front
1. Body ground E24 2. Engine ground F9 3. Engine ground F16
4. Body ground E15
BBIA0698E