2005 NISSAN X-TRAIL ignition

EC-1544
[YD (WITHOUT EURO-OBD)]
DTC P0504 ASCD BRAKE SWITCH

DTC P0504 ASCD BRAKE SWITCHPFP:25320
Component DescriptionEBS01FDM
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-1690, "
AUTOMATIC SPEED CONTROL DEVICE
(ASCD)" for the ASCD function.
CONSULT-II Reference Value in Data Monitor ModeEBS01FDN
Specification data are reference values.
On Board Diagnosis LogicEBS01FDO
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

DTC P0504 ASCD BRAKE SWITCH
EC-1545
[YD (WITHOUT EURO-OBD)]
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DTC confirmation ProcedureEBS01FDP
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-1548, "
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-1548, "
Diagnostic Procedure" .
Overall Function CheckEBS01FEH
Use this procedure to check the overall function of the ASCD brake switch circuit. During this check, a DTC
might not be confirmed.
WITHOUT CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 101 (ASCD brake switch
signal) and ground under the following conditions.
3. If NG, go to EC-1548, "
Diagnostic Procedure" .
If OK, go to next step.
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
CONDITION VOLTAGE
Clutch pedal and brake pedal: Fully released Battery voltage
Clutch pedal and/or brake pedal: Slightly depressed Approximately 0V
PBIB1677E

EC-1548
[YD (WITHOUT EURO-OBD)]
DTC P0504 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 ProcedureEBS01FDR
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

DTC P0504 ASCD BRAKE SWITCH
EC-1549
[YD (WITHOUT EURO-OBD)]
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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 slightly depressed ON
When brake pedal and clutch pedal are fully 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

EC-1550
[YD (WITHOUT EURO-OBD)]
DTC P0504 ASCD BRAKE SWITCH

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-1552, "
Component Inspection"
OK or NG
OK >> GO TO 14.
NG >> Replace stop lamp switch.
PBIB2878E
Voltage: Battery voltage
PBIB0117E
Continuity should exist.

DTC P0504 ASCD BRAKE SWITCH
EC-1551
[YD (WITHOUT EURO-OBD)]
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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

EC-1552
[YD (WITHOUT EURO-OBD)]
DTC P0504 ASCD BRAKE SWITCH

9. DETECT MALFUNCTIONING PART
Check the following.

Fuse block (J/B) connector M2

10A fuse

Harness for open or short between ASCD clutch switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
10. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between ASCD clutch switch terminal 2 and ASCD brake switch terminal 1.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 11.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
11 . CHECK ASCD CLUTCH SWITCH
Refer to EC-1552, "
Component Inspection"
OK or NG
OK >> GO TO 14.
NG >> Replace ASCD clutch switch.
12. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 101 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 13.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
13. CHECK ASCD BRAKE SWITCH
Refer to EC-1552, "
Component Inspection"
OK or NG
OK >> GO TO 14.
NG >> Replace ASCD brake switch.
14. CHECK INTERMITTENT INCIDENT
Refer to EC-1414, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS01FDS
ASCD BRAKE SWITCH
1. Turn ignition switch OFF.Continuity should exist.
Continuity should exist.

DTC P0504 ASCD BRAKE SWITCH
EC-1553
[YD (WITHOUT EURO-OBD)]
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2. Disconnect ASCD brake switch harness connector.
3. Check continuity between ASCD brake switch terminals 1 and 2
under the following conditions.
If NG, adjust ASCD brake switch installation, refer to BR-6,
"BRAKE PEDAL" , and perform step 3 again.
ASCD CLUTCH SWITCH
1. Turn ignition switch OFF.
2. Disconnect ASCD clutch switch harness connector.
3. Check harness continuity between ASCD clutch switch terminals 1 and 2 under the following conditions.
If NG, adjust ASCD clutch switch installation, refer to CL-5,
"CLUTCH PEDAL" , and perform step 3 again.
STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals 1
and 2 under the following conditions.
If NG, adjust stop lamp switch installation, refer to BR-6,
"BRAKE PEDAL" , and perform step 3 again.
Condition Continuity
When brake pedal is fully released. Should exist.
When brake pedal is slightly depressed. Should not exist.
SEC023D
Condition Continuity
When clutch pedal is fully released. Should exist.
When clutch pedal is slightly depressed. Should not exist.
SEC024D
Condition Continuity
When brake pedal is fully released. Should not exist.
When brake pedal is slightly depressed. Should exist.
PBIB0118E