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DTC P0503 ASCD VEHICLE SPEED SENSOR
EC-1205
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Diagnostic ProcedureEBS01FC8
1. CHECK DTC WITH ESP/TCS/ABS CONTROL UNIT (MODELS WITH ESP) OR ABS ACTUATOR AND
ELECTRIC UNIT (CONTROL UNIT) (MODELS WITHOUT ESP)
Refer to BRC-60, "
TROUBLE DIAGNOSIS" (models with ESP system) or BRC-12, "TROUBLE DIAGNOSIS"
(models without ESP system).
OK or NG
OK >> GO TO 2.
NG >> Repair or replace.
2. CHECK COMBINATION METER
Check combination meter function.
Refer to DI-4, "
COMBINATION METERS" .
>>INSPECTION END
Page 1610 of 4555
![NISSAN X-TRAIL 2005 Service Repair Manual EC-1206
[YD (WITH EURO-OBD)]
DTC P0504 ASCD BRAKE SWITCH
DTC P0504 ASCD BRAKE SWITCHPFP:25320
Component DescriptionEBS01FC9
When the brake pedal is depressed, ASCD brake switch (1) and
stop lamp swi NISSAN X-TRAIL 2005 Service Repair Manual EC-1206
[YD (WITH EURO-OBD)]
DTC P0504 ASCD BRAKE SWITCH
DTC P0504 ASCD BRAKE SWITCHPFP:25320
Component DescriptionEBS01FC9
When the brake pedal is depressed, ASCD brake switch (1) and
stop lamp swi](/manual-img/5/57403/w960_57403-1609.png)
EC-1206
[YD (WITH EURO-OBD)]
DTC P0504 ASCD BRAKE SWITCH
DTC P0504 ASCD BRAKE SWITCHPFP:25320
Component DescriptionEBS01FC9
When the brake pedal is depressed, ASCD brake switch (1) and
stop lamp switch (2) are turned ON. ECM detects the state of the
brake pedal by this input of two kinds (ON/OFF signal).
Refer to EC-1339, "
AUTOMATIC SPEED CONTROL DEVICE
(ASCD)" for the ASCD function.
CONSULT-II Reference Value in Data Monitor ModeEBS01FCA
Specification data are reference values.
On Board Diagnosis LogicEBS01FCC
This self-diagnosis has the one trip detection logic.
MI will not light up for this diagnosis.
PBIB2882E
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW
Ignition switch: ONBrake pedal: Fully released OFF
Brake pedal: Slightly
depressedON
BRAKE SW2
Ignition switch: ONBrake pedal and clutch pedal:
Fully releasedOFF
Brake pedal and/or clutch
pedal: Slightly depressedON
DTC No.Trouble Diagnosis
NameDTC Detecting Condition Possible Cause
P0504
0504ASCD brake switch
When the vehicle speed is above 5 km/h (3
MPH), ON signal from the stop lamp switch
and OFF signal from the ASCD brake
switch are sent to the ECM at the same
time.
Harness or connectors
(The stop lamp switch circuit is open or
shorted.)
Harness or connectors
(The ASCD brake switch circuit is open or
shorted.)
Harness or connectors
(The ASCD clutch switch circuit is open or
shorted.)
Stop lamp switch
ASCD brake switch
ASCD clutch switch
Incorrect stop lamp switch installation
Incorrect ASCD brake switch installation
Incorrect ASCD clutch switch installation
ECM
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![NISSAN X-TRAIL 2005 Service Repair Manual DTC P0504 ASCD BRAKE SWITCH
EC-1207
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DTC confirmation ProcedureEBS01FCD
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedu NISSAN X-TRAIL 2005 Service Repair Manual DTC P0504 ASCD BRAKE SWITCH
EC-1207
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DTC confirmation ProcedureEBS01FCD
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedu](/manual-img/5/57403/w960_57403-1610.png)
DTC P0504 ASCD BRAKE SWITCH
EC-1207
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DTC confirmation ProcedureEBS01FCD
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:
Steps 3 and 4 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 (ESP switch OFF).
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Drive the vehicle for at least 5 consecutive seconds under the
following condition.
If DTC is detected, go to EC-1209, "
Diagnostic Procedure" .
If DTC is not detected, go to the following step.
4. Drive the vehicle for at least 5 consecutive seconds under the
following condition.
5. If DTC is detected, go to EC-1209, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
VHCL SPEED SE More than 5 km/h (3 MPH)
Selector lever Suitable position
VHCL SPEED SE More than 5 km/h (3 MPH)
Selector lever Suitable position
Driving locationDepress the brake pedal for more than
five seconds so as not to come off from
the above-mentioned condition.
MBIB1085E
Page 1612 of 4555
EC-1208
[YD (WITH EURO-OBD)]
DTC P0504 ASCD BRAKE SWITCH
Wiring Diagram EBS01FCE
TBWB0477E
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![NISSAN X-TRAIL 2005 Service Repair Manual DTC P0504 ASCD BRAKE SWITCH
EC-1209
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Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM NISSAN X-TRAIL 2005 Service Repair Manual DTC P0504 ASCD BRAKE SWITCH
EC-1209
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Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM](/manual-img/5/57403/w960_57403-1612.png)
DTC P0504 ASCD BRAKE SWITCH
EC-1209
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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 ProcedureEBS01FCO
1. CHECK OVERALL FUNCTION-I
With CONSULT-II
1. Turn ignition switch ON.
2. Select “BRAKE SW” in “DATA MONITOR” mode with CON-
SULT-II.
3. Check “BRAKE SW” indication under the following conditions.
Without CONSULT-II
Check voltage between ECM terminal 100 and ground under the fol-
lowing conditions.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
100 P Stop lamp switch[Ignition switch OFF]
Brake pedal: Fully releasedApproximately 0V
[Ignition switch OFF]
Brake pedal: Slightly depressedBATTERY VOLTAGE
(11 - 14V)
101 GY/L ASCD brake switch[Ignition switch ON]
Brake pedal and clutch pedal: Fully releasedBATTERY VOLTAGE
(11 - 14V)
[Ignition switch ON]
Brake pedal and/or clutch pedal: Slightly
depressedApproximately 0V
CONDITION INDICATION
When brake pedal is slightly depressed ON
When brake pedal is fully released OFF
PBIB0472E
Condition Voltage
When brake pedal is slightly depressed battery voltage
When brake pedal is fully released Approximately 0V
MBIB1097E
Page 1614 of 4555
EC-1210
[YD (WITH EURO-OBD)]
DTC P0504 ASCD BRAKE SWITCH
2. CHECK OVERALL FUNCTION-II
With CONSULT-II
Check “BRAKE SW2” indication in “DATA MONITOR” mode.
Without CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 101 and ground under the
following conditions.
OK or NG
OK >> GO TO 14.
NG >> GO TO 7.
CONDITION INDICATION
When brake pedal and/or clutch pedal is fully depressed ON
When brake pedal and clutch pedal are slightly released OFF
SEC013D
Condition Voltage
When brake pedal and/or clutch pedal is slightly depressed Approximately 0V
When brake pedal and clutch pedal are fully released Battery voltage
PBIB1677E
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![NISSAN X-TRAIL 2005 Service Repair Manual DTC P0504 ASCD BRAKE SWITCH
EC-1211
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3. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness NISSAN X-TRAIL 2005 Service Repair Manual DTC P0504 ASCD BRAKE SWITCH
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3. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness](/manual-img/5/57403/w960_57403-1614.png)
DTC P0504 ASCD BRAKE SWITCH
EC-1211
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3. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector (1).
–ASCD brake switch harness connector (2)
–ASCD clutch switch harness connector (3)
3. Check voltage between stop lamp switch terminal 1 and ground
with CONSULT -II or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following.
Fuse block (J/B) connector M2
15A fuse
Harness for open or short between stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 100 and stop lamp switch terminal 2.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK STOP LAMP SWITCH
Refer to EC-1213, "
Component Inspection"
OK or NG
OK >> GO TO 14.
NG >> Replace stop lamp switch.
PBIB2878E
Voltage: Battery voltage
PBIB0117E
Continuity should exist.
Page 1616 of 4555
EC-1212
[YD (WITH EURO-OBD)]
DTC P0504 ASCD BRAKE SWITCH
7. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch (2) harness connector.
–Stop lamp switch (1)
–ASCD clutch switch (3)
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 12.
NG >> GO TO 8.
8. CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD clutch switch harness connector (3).
–Stop lamp switch harness connector (1)
–ASCD brake switch harness connector (2)
3. Turn ignition switch ON.
4. Check voltage between ASCD clutch switch terminal 1 and
ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
PBIB2878E
Voltage: Battery voltage
PBIB0857E
PBIB2878E
Voltage: Battery voltage
PBIB0799E