2009 NISSAN LATIO light

DTC P1572 ASCD BRAKE SWITCH
EC-1437
< SERVICE INFOMATION >
[MR TYPE 2] C
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3. Check continuity between ASCD clutch switch terminals 1 and 2
under the following conditions.
If NG, adjust ASCD clutch switch installation, refer to CL-5 , and
perform step 3 again.
STOP LAMP SWITCH 1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.
If NG, adjust stop lamp switch installation, refer to BR-6 , and perform step 3 again.
Condition Continuity
Clutch pedal: Fully released. Should exist.
Clutch pedal: Slightly depressed. Should not exist. SEC023D
Condition Continuity
Brake pedal: Fully released. Should not exist.
Brake pedal: Slightly depressed. Should exist. PBIB3318E

for ASCD functions.
On Board Diagn osis Logic INFOID:0000000004500316
NOTE:
• If DTC P1574 is displayed with DTC UXXXX, first perform the tr ouble diagnosis for DTC UXXXX.
• If DTC P1574 is displayed with DTC P0500, first pe rform the trouble diagnosis for DTC P0500. Refer
to EC-1387 .
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
DTC Confirmation Procedure INFOID:0000000004500317
CAUTION:
Always drive vehicle at a safe speed.
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:
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.
1. Start engine.
2. Drive the vehicle at more than 40 km/h (25MPH).
3. Check DTC.
4. If DTC is detected, go to EC-1438, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004500318 (A/T) or
CVT-209 (CVT).
OK or NG OK >> GO TO 2.
NG >> Perform trouble shooting relevant to DTC indicated. .
OK or NG OK >> GO TO 3.DTC No.
Trouble diagnosis
name DTC detecting condition Possible cause
P1574
1574 ASCD vehicle speed
sensor ECM 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
• ABS actuator and electric unit (control unit)
• Combination meter
• ECM

.
• If DTC P1715 is displayed with DTC P0340 first perform the trouble diagnosis for DTC P0340.
Refer to EC-1299 .
• If DTC P1715 is displayed with DTC P0605, first pe rform the trouble diagnosis for DTC P0605. Refer
to EC-1393 .
• If DTC P1715 is displayed with DTC P0607, first pe rform the trouble diagnosis for DTC P0607. Refer
to EC-1395 .
The MIL will not lights up for this diagnosis.
Diagnosis Procedure INFOID:0000000004500322.
OK or NG OK >> GO TO 2.
NG >> Perform trouble shooting relevant to DTC indicated. .
>> 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
1715 Input 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

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DTC P1715 INPUT SPEED SENS
OR (PRIMARY SPEED SENSOR)
Description INFOID:0000000004500323
ECM receives primary speed sensor signal from TCM through CAN communication line.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004500324
Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004500325
NOTE:
• If DTC P1715 is displayed with DTC UXXXX, first perform the tr ouble diagnosis for DTC UXXXX.
• If DTC P1715 is displayed with DT C P0335, first perform the trouble diagnosis for DTC P0335. Refer
to EC-1293 .
• If DTC P1715 is displayed with DTC P0340 firs t perform the trouble diagnosis for DTC P0340.
Refer to EC-1299 .
• If DTC P1715 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-1393 .
• If DTC P1715 is displayed with DT C P0607, first perform the trouble diagnosis for DTC P0607. Refer
to EC-1395 .
The MIL will not lights up for this diagnosis.
DTC Confirmation Procedure INFOID:0000000004500326
CAUTION:
Always drive vehicle at a safe speed.
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.
1. Start engine.
2. Drive vehicle at a speed of more than 50 km/h (31 MPH) for at least 5 seconds.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to EC-1441, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004500327.
OK or NG OK >> GO TO 2.
NG >> Perform trouble shooting relevant to DTC indicated. Removal and Installation " .
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
1715 Input 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

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DTC P1805 BRAKE SWITCH
Description INFOID:0000000004500328
Brake switch signal is applied to the ECM through t he 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-III Reference Val ue in Data Monitor Mode INFOID:0000000004500329
Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004500330
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 Procedure INFOID:0000000004500331
1. Turn ignition switch ON.
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the DTC.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to EC-1445, " Diagnosis Procedure " .
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW • Ignition switch: ON Brake pedal: Fully released OFF
Brake pedal: Slightly depressed ON DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1805
1805 Brake switch A 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 NormalAccelerating Poor acceleration

DTC P1805 BRAKE SWITCH
EC-1445
< SERVICE INFOMATION >
[MR TYPE 2] C
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Diagnosis Procedure
INFOID:00000000045003331.
CHECK STOP LAMP SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Check the stop lamp when depressing and releasing the brake pedal.
OK or NG OK >> GO TO 4.
NG >> GO TO 2. 2.
CHECK STOP LAMP SWIT CH POWER SUPPLY CIRCUIT
1. Disconnect stop lamp switch (1) harness connector.
- Brake pedal (2)
2. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-III or tester.
OK or NG OK >> GO TO 4.
NG >> GO TO 3. 3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M69, E7
• 10A fuse
• Harness for open and short between stop lamp switch and battery TERMI-
NAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
99 R Stop lamp switch [Ignition switch: OFF]
• Brake pedal: Fully released Approximately 0V
[Ignition switch: OFF]
• Brake pedal: Slightly depressed BATTERY VOLTAGE
(11 - 14V) Brake pedal Stop lamp
Fully released Not illuminated
Slightly depressed Illuminated BBIA0710E
Voltage: Battery voltage PBIB3317E

EC-1446< SERVICE INFOMATION >
[MR TYPE 2]
DTC P1805 BRAKE SWITCH
>> Repair open circuit or short to ground or short to power in harness or connectors. 4.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect stop lamp switch (1) harness connector.
2. Disconnect ECM harness connector.
3. Check harness continuity between stop lamp switch terminal 2 and ECM terminal 99.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness connectors. 5.
CHECK STOP LAMP SWITCH
Refer to EC-1446, " Component Inspection " .
OK or NG OK >> GO TO 6.
NG >> Replace stop lamp switch. 6.
CHECK INTERMITTENT INCIDENT
Refer to EC-1138 .
>> INSPECTION END
Component Inspection INFOID:0000000004500334
STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.
If NG, adjust stop lamp switch installation, refer to BR-6 , and perform step 3 again.
Continuity should exist.
Condition Continuity
Brake pedal: Fully released. Should not exist.
Brake pedal: Slightly depressed. Should exist. PBIB3318E

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DTC P2100, P2103 THROTTLE
CONTROL MOTOR RELAY
Component Description INFOID:0000000004500335
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 batte ry 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-III Reference Val ue in Data Monitor Mode INFOID:0000000004500336
Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004500337
These self-diagnoses have one trip detection logic.
FAIL-SAFE MODE When the malfunction is detected, ECM ent ers fail-safe mode and the MIL lights up.
DTC Confirmation Procedure INFOID:0000000004500338
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.
PROCEDURE FOR DTC P2100 1. Turn ignition switch ON and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check 1st trip DTC.
4. If DTC is detected, go to EC-1449, " Diagnosis Procedure " .
PROCEDURE FOR DTC P2103 TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
1. Turn ignition switch ON and wait at least 1 second.
2. Check DTC.
3. If DTC is detected, go to EC-1449, " Diagnosis Procedure " .
MONITOR ITEM CONDITION SPECIFICATION
THRTL RELAY • Ignition switch: ON ON DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2100
2100 Throttle control motor
relay circuit open ECM 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
2103 Throttle control motor
relay circuit short ECM 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) b y the return
spring.