2005 NISSAN X-TRAIL brake light switch

EC-102
[QR (WITH EURO-OBD)]
TROUBLE DIAGNOSIS

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)101 P Stop lamp switch[Ignition switch: OFF]

Brake pedal: Fully releasedApproximately 0V
[Ignition switch: OFF]

Brake pedal: Slightly depressedBATTERY VOLTAGE
(11 - 14V)
102 G/OR PNP switch[Ignition switch: ON]

Shift lever: P or N (A/T), Neutral (M/T)Approximately 0V
[Ignition switch: ON]

Except above positionA/T models
BATTERY VOLTAGE
(11 - 14V)
M/T models
Approximately 5V
104 W/BThrottle control motor
relay[Ignition switch: OFF]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]0 - 1.0V
106 WAccelerator pedal position
sensor 1[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully released0.5 - 1.0V
[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully depressed3.9 - 4.7V
108*
1GY/L ASCD brake switch[Ignition switch: ON]

Brake pedal: Slightly depressed

Clutch pedal: Slightly depressed (M/T)Approximately 0V
[Ignition switch: ON]

Brake pedal: Fully released

Clutch pedal: Fully released (M/T)BATTERY VOLTAGE
(11 - 14V)
109 B/R Ignition switch[Ignition switch: OFF]0V
[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
111 G/WECM relay
(Self shut-off)[Engine is running]
[Ignition switch: OFF]

For a few seconds after turning ignition switch
OFF0 - 1.0V
[Ignition switch: OFF]

More than a few seconds after turning ignition
switch OFFBATTERY VOLTAGE
(11 - 14V)
114 B/OR Fuel pump relay[Ignition switch: ON]

For 1 second after turning ignition switch ON
[Engine is running]0 - 1.0V
[Ignition switch: ON]

More than 1 second after turning ignition
switch ONBATTERY VOLTAGE
(11 - 14V)
11 5
11 6B
BECM ground[Engine is running]

Idle speedBody ground
11 9
120SB
GYPower supply for ECM[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
121 W/LPower supply for ECM
(Back-up)[Ignition switch: OFF]BATTERY VOLTAGE
(11 - 14V) TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)

EC-108
[QR (WITH EURO-OBD)]
TROUBLE DIAGNOSIS

INT/A TEMP SE [°C]
or [°F]××
The intake air temperature (determined by the
signal voltage of the intake air temperature
sensor) is indicated.
START SIGNAL
[ON/OFF]××

Indicates start signal status [ON/OFF] com-
puted by the ECM according to the signals of
engine speed and battery voltage.
After starting the engine, [OFF] is
displayed regardless of the
starter signal.
CLSD THL POS
[ON/OFF]××

Indicates idle position [ON/OFF] computed by
the ECM according to the accelerator pedal
position sensor signal.
AIR COND SIG
[ON/OFF]××

Indicates [ON/OFF] condition of the air condi-
tioner switch as determined by the air condi-
tioner signal.
P/N POSI SW
[ON/OFF]××

Indicates [ON/OFF] condition from the park/
neutral position (PNP) switch signal.
PW/ST SIGNAL
[ON/OFF]××

[ON/OFF] condition of the power steering
pressure sensor as determined by the power
steering pressure sensor is indicated.
LOAD SIGNAL [ON/
OFF]××

Indicates [ON/OFF] condition from the electri-
cal load signal.
ON: Rear window defogger switch is ON and/
or lighting switch is in 2nd position (placed in
LOW position for models with Xenon head-
lamp).
OFF: Both rear window defogger switch and
lighting switch are OFF.
IGNITION SW
[ON/OFF]×

Indicates [ON/OFF] condition from ignition
switch.
HEATER FAN SW
[ON/OFF]×

Indicates [ON/OFF] condition from the heater
fan switch signal.
BRAKE SW
[ON/OFF]×

Indicates [ON/OFF] condition from the stop
lamp switch signal.
INJ PULSE-B1
[msec]×

Indicates the actual fuel injection pulse width
compensated by ECM according to the input
signals.
When the engine is stopped, a
certain computed value is indi-
cated.
IGN TIMING [BTDC]×

Indicates the ignition timing computed by ECM
according to the input signals.
When the engine is stopped, a
certain value is indicated.
CAL/LD VALUE [%]

“Calculated load value” indicates the value of
the current airflow divided by peak airflow.
MASS AIRFLOW
[g·m/s]

Indicates the mass airflow computed by ECM
according to the signal voltage of the mass air
flow sensor.
PURG VOL C/V [%]

Indicates the EVAP canister purge volume
control solenoid valve control value computed
by the ECM according to the input signals.

The opening becomes larger as the value
increases.
INT/V TIM (B1)
[°CA]

Indicates [°CA] of intake camshaft advanced
angle.
INT/V SOL (B1) [%]

The control value of the intake valve timing
control solenoid valve (determined by ECM
according to the input signal) is indicated.

The advance angle becomes larger as the
value increases Monitored item
[Unit]ECM
INPUT
SIGNALSMAIN
SIG-
NALSDescription Remarks

EC-116
[QR (WITH EURO-OBD)]
TROUBLE DIAGNOSIS

LOAD SIGNAL
Ignition switch: ONRear window defogger switch is ON
and/or lighting switch is in 2nd (placed
in LOW position for models with
Xenon headlamp).ON
Rear window defogger switch is OFF
and lighting switch is OFF.OFF
IGNITION SW

Ignition switch: ON → OFF → ON ON → OFF → ON
HEATER FAN SW

Ignition switch: ONHeater fan is operating. ON
Heater fan is not operating OFF
BRAKE SW

Ignition switch: ONBrake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
INJ PULSE-B1

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle 2.0 - 3.0 msec
2,000 rpm 1.9 - 2.9 msec
IGN TIMING

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle 13° - 17° BTDC
2,000 rpm 25° - 45° BTDC
CAL/LD VALUE

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle 10% - 35%
2,500 rpm 10% - 35%
MASS AIRFLOW

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle 1.0 - 4.0 g·m/s
2,500 rpm 4.0 - 10.0 g·m/s
PURG VOL C/V

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle 0%
2,000 rpm 20 - 30%
INT/V TIM (B1)

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle−5° - 5°CA
2,000 rpm Approx. 0° - 20°CA
INT/V SOL (B1)

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle 0% - 2%
2,000 rpm Approx. 0% - 50%
VIAS S/V*
2
Engine: After warming upIdle OFF
More than 5,000 rpm ON MONITOR ITEM CONDITION SPECIFICATION

TROUBLE DIAGNOSIS
EC-117
[QR (WITH EURO-OBD)]
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EC

AIR COND RLY
Engine: After warming up, idle
the engineAir conditioner switch: OFF OFF
Air conditioner switch: ON
(Compressor operates)ON
FUEL PUMP RLY

For 1 second after turning ignition switch ON

Engine running or crankingON

Except above conditions OFF
THRTL RELAY

Ignition switch: ON ON
COOLING FAN

Engine: After warming up, idle
the engine

Air conditioner switch: OFFEngine coolant temperature is 94°C
(201°F) or lessOFF
Engine coolant temperature is
between 95°C (203°F) and 99°C
(210°F)LOW
Engine coolant temperature is 100°C
(212°F) or moreHIGH
HO2S1 HTR (B1)

Engine: After warming up

Engine speed: Below 3,600 rpmON

Engine speed: Above 3,600 rpm OFF
HO2S2 HTR (B1)

Engine speed is below 3,600 rpm after the following conditions are met.
–Engine: After warming up
–Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute
and at idle for 1 minute under no load.ON

Engine speed: Above 3,600 rpm OFF
TRVL AFTER MIL

Ignition switch: ONVehicle has traveled after MI has
turned ON.0 - 65,535 km
(0 - 40,723 mile)
O2SEN HTR DTY

Engine coolant temperature when engine started: More than 80°C
(176°F)

Engine speed: below 3,600 rpmApprox. 50%
AC PRESS SEN

Engine: Idle

Air conditioner switch: ON (Compressor operates)1.0 - 4.0V
VEH SPEED SE

Turn drive wheels and compare CONSULT-II value with the speedome-
ter indication.Almost the same speed as the
speedometer indication
SET VHCL SPD*
2
Engine: Running ASCD: Operating.The preset vehicle speed is dis-
played.
MAIN SW*
2
Ignition switch: ONMAIN switch: Pressed ON
MAIN switch: Released OFF
CANCEL SW*
2
Ignition switch: ONCANCEL switch: Pressed ON
CANCEL switch: Released OFF
RESUME/ACC SW*
2
Ignition switch: ONRESUME/ACCELERATE switch:
PressedON
RESUME/ACCELERATE switch:
ReleasedOFF
SET SW*
2
Ignition switch: ONSET/COAST switch: Pressed ON
SET/COAST switch: Released OFF
BRAKE SW1*
2
Ignition switch: ONBoth clutch pedal (M/T) and brake
pedal: Fully releasedON
Clutch pedal (M/T) and/or brake
pedal: Slightly depressedOFF
BRAKE SW2*
2
Ignition switch: ONBrake pedal: Fully released OFF
Brake pedal: Slightly depressed ON MONITOR ITEM CONDITION SPECIFICATION

DTC P1572 ASCD BRAKE SWITCH
EC-387
[QR (WITH EURO-OBD)]
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DTC P1572 ASCD BRAKE SWITCHPFP:25320
Component DescriptionEBS01FAB
When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp switch is turned ON. ECM detects the state of
the brake pedal by this input of two kinds (ON/OFF signal).
Refer to EC-529, "
AUTOMATIC SPEED CONTROL DEVICE
(ASCD)" for the ASCD function.
CONSULT-II Reference Value in Data Monitor ModeEBS01FAC
Specification data are reference values.
On Board Diagnosis LogicEBS01FAD
This self-diagnosis has the one trip detection logic.
The MI will not light up for this diagnosis.
NOTE:

If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to EC-283, "
DTC P0605 ECM".

This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not
stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when ignition switch OFF. And even when malfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
SEC009D
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW1
(ASCD brake switch)

Ignition switch: ONClutch pedal (M/T) and brake pedal:
Fully releasedON
Clutch pedal (M/T) and/or brake pedal:
Slightly depressedOFF
BRAKE SW2
(Stop lamp switch)

Ignition switch: ONBrake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
DTC No.Trouble Diagnosis
NameDTC Detecting Condition Possible Cause
P1572
1572ASCD brake switchA)When the vehicle speed is above 30km/h
(19 MPH), ON signals from the stop lamp
switch and the ASCD brake switch are sent
to ECM at the same time.

Harness or connectors
(The stop lamp switch circuit is shorted.)

Harness or connectors
(The ASCD brake switch circuit is shorted.)

Harness or connectors
(The ASCD clutch switch circuit is shorted.)
(M/T models)

Stop lamp switch

ASCD brake switch

ASCD clutch switch
(M/T models)

Incorrect stop lamp switch installation

Incorrect ASCD brake switch installation

Incorrect ASCD clutch switch installation
(M/T models)

ECM B)ASCD brake switch signal is not sent to
ECM for extremely long time while the vehi-
cle is driving

EC-388
[QR (WITH EURO-OBD)]
DTC P1572 ASCD BRAKE SWITCH

DTC Confirmation ProcedureEBS01FAE
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.

Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for
malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be
detected.
TESTING CONDITION:
Steps 4 and 5 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 (EPS switch OFF).
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Press MAIN switch and make sure that CRUISE indicator lights
up.
4. Drive the vehicle for at least 5 consecutive seconds under the
following condition.
If 1st trip DTC is detected, go to EC-390, "
Diagnostic Procedure"
.
If 1st trip DTC is not detected, go to the following step.
5. Drive the vehicle for at least 5 consecutive seconds under the following condition.
6. If 1st trip DTC is detected, go to EC-390, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
VHCL SPEED SE More than 30 km/h (19 MPH)
Shift lever Suitable position
VHCL SPEED SE More than 30 km/h (19 MPH)
Shift lever Suitable position
Driving locationDepress the brake pedal for more than
five seconds so as not to come off from
the above-mentioned vehicle speed.
PBIB2386E

EC-390
[QR (WITH EURO-OBD)]
DTC P1572 ASCD BRAKE SWITCH

Specification data are reference values and are measured between each terminal and ground.
CAUTION:
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.
Diagnostic ProcedureEBS01FAH
1. CHECK OVERALL FUNCTION-I
With CONSULT-II
1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-II.
3. Check “BRAKE SW1” indication under the following conditions.
A/T models
M/T models
Without CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 108 and ground under the
following conditions.
A/T models
M/T models
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
101 P Stop lamp switch[Ignition switch: OFF]

Brake pedal: Fully releasedApproximately 0V
[Ignition switch: OFF]

Brake pedal: Slightly depressedBATTERY VOLTAGE
(11 - 14V)
108 GY/L ASCD brake switch[Ignition switch: ON]

Brake pedal and/or clutch pedal (M/T):
Slightly depressedApproximately 0V
[Ignition switch: ON]

Brake pedal and clutch pedal (M/T):
Fully releasedBATTERY VOLTAGE
(11 - 14V)
CONDITION INDICATION
Brake pedal: Slightly depressed OFF
Brake pedal: Fully released ON
CONDITION INDICATION
Clutch pedal and/or brake pedal: Slightly depressed OFF
Clutch pedal and brake pedal: Fully released ON
SEC011D
CONDITION VOLTAGE
Brake pedal: Slightly depressed Approximately 0V
Brake pedal: Fully released Battery voltage
CONDITION VOLTAGE
Clutch pedal and/or brake pedal: Slightly depressed Approximately 0V
Clutch pedal and brake pedal: Fully released Battery voltage
MBIB0061E

DTC P1572 ASCD BRAKE SWITCH
EC-391
[QR (WITH EURO-OBD)]
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2. CHECK OVERALL FUNCTION-II
With CONSULT-II
1. Select “BRAKE SW2” in “DATA MONITOR” mode with CONSULT-II.
2. Check “BRAKE SW2” indication under the following conditions.
Without CONSULT-II
Check voltage between ECM terminal 101 and ground under the fol-
lowing conditions.
OK or NG
OK >> GO TO 15.
NG >> GO TO 11.
3. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
4. Check voltage between ASCD brake switch terminal 1 and
ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 9.
NG (A/T models)>>GO TO 4.
NG (M/T models)>>GO TO 5.
CONDITION INDICATION
Brake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
SEC013D
CONDITION VOLTAGE
Brake pedal: Fully released Approximately 0V
Brake pedal: Slightly depressed Battery voltage
MBIB0060E
SEC009D
Voltage: Battery voltage
PBIB0857E