Nissan Pathfinder (2008 year). Manual — part 337
P1572 ASCD BRAKE SWITCH
EC-813
< COMPONENT DIAGNOSIS >
[VK56DE]
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P1572 ASCD BRAKE SWITCH
Component Description
INFOID:0000000001537932
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
On Board Diagnosis Logic
INFOID:0000000001537933
• This self-diagnosis has the one trip detection logic.
• The MIL will not light up for this self-diagnosis.
NOTE:
• If DTC P 1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
• 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.
DTC Confirmation Procedure
INFOID:0000000001537934
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
• 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.
• If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
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-III
1.
Start engine (VDC switch OFF).
2.
Select “DATA MONITOR” mode with CONSULT-III.
3.
Press MAIN switch and make sure that CRUISE indicator lights up.
BBIA0560E
DTC No.
Trouble Diagnosis
Name
DTC Detecting Condition
Possible Cause
P1572
1572
ASCD brake switch
A)
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.)
• Stop lamp switch
• ASCD brake switch
• Incorrect stop lamp switch installation
• Incorrect ASCD brake switch installation
• ECM
B)
ASCD brake switch signal is not sent to ECM
for extremely long time while the vehicle is
driving
EC-814
< COMPONENT DIAGNOSIS >
[VK56DE]
P1572 ASCD BRAKE SWITCH
4.
Drive the vehicle for at least 5 consecutive seconds under the following condition.
5.
Check 1st trip DTC.
If 1st trip DTC is detected, go to
If 1st trip DTC is not detected, go to the following step.
6.
Drive the vehicle for at least 5 consecutive seconds under the following condition.
7.
Check 1st trip DTC.
8.
If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis Procedure
INFOID:0000000001537935
1.
CHECK OVERALL FUNCTION-I
With CONSULT-III
1.
Turn ignition switch ON.
2.
Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.
3.
Check “BRAKE SW1” indication under the following conditions.
Without CONSULT-III
1.
Turn ignition switch ON.
2.
Check voltage between ECM terminal 108 and ground under the
following conditions.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 3.
2.
CHECK OVERALL FUNCTION-II
With CONSULT-III
Check “BRAKE SW2” indication in “DATA MONITOR” mode.
Without CONSULT-III
VHCL SPEED SE
More than 30 km/h (19 MPH)
Selector lever
Suitable position
VHCL SPEED SE
More than 30 km/h (19 MPH)
Selector lever
Suitable position
Driving location
Depress the brake pedal for more than
five seconds so as not to come off from
the above-mentioned condition.
CONDITION
INDICATION
Brake pedal: Slightly depressed
OFF
Brake pedal: Fully released
ON
CONDITION
VOLTAGE
Brake pedal: Slightly depressed
Approximately 0V
Brake pedal: Fully released
Battery voltage
MBIB0061E
CONDITION
INDICATION
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
P1572 ASCD BRAKE SWITCH
EC-815
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[VK56DE]
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Check voltage between ECM terminal 101 and ground under the following conditions.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 7.
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-III 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 E160
• 10A fuse
• Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
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 108 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 6.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
CONDITION
VOLTAGE
Brake pedal: Fully released
Approximately 0V
Brake pedal: Slightly depressed
Battery voltage
PBIB1537E
BBIA0560E
Voltage: Battery voltage
PBIB0857E
Continuity should exist.
EC-816
< COMPONENT DIAGNOSIS >
[VK56DE]
P1572 ASCD BRAKE SWITCH
6.
CHECK ASCD BRAKE SWITCH
EC-817, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> Replace ASCD brake switch.
7.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp switch harness connector.
3.
Check voltage between stop lamp switch terminal 1 and ground
with CONSULT-III or tester.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E160
• 10A 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.
9.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminal 101 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 10.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK STOP LAMP SWITCH
EC-817, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> Replace stop lamp switch.
BBIA0560E
Voltage: Battery voltage
PBIB1184E
Continuity should exist.
P1572 ASCD BRAKE SWITCH
EC-817
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[VK56DE]
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11.
CHECK INTERMITTENT INCIDENT
GI-51, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000001537936
ASCD BRAKE SWITCH
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Check harness continuity between ASCD brake switch terminals
1 and 2 under the following conditions.
If NG, adjust ASCD brake switch installation, refer to
, 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
, and perform step 3 again.
Condition
Continuity
Brake pedal: Fully released
Should exist.
Brake pedal: Slightly depressed
Should not exist.
SEC023D
Condition
Continuity
Brake pedal: Fully released
Should not exist.
Brake pedal: Slightly depressed
Should exist.
PBIB1185E
EC-818
< COMPONENT DIAGNOSIS >
[VK56DE]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
Component Description
INFOID:0000000001537937
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
for ASCD functions.
On Board Diagnosis Logic
INFOID:0000000001537938
• This self-diagnosis has the one trip detection logic.
• The MIL will not light up for this self-diagnosis.
NOTE:
• If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to
• If DTC P1574 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer
.
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
.
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
DTC Confirmation Procedure
INFOID:0000000001537939
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
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 (VDC switch OFF).
2.
Drive the vehicle at more than 40 km/h (25 MPH).
3.
Check DTC.
4.
If DTC is detected, go to
.
Diagnosis Procedure
INFOID:0000000001537940
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-33, "OBD-II Diagnostic Trouble Code (DTC)"
OK or NG
OK
>> GO TO 2.
NG
>> Perform trouble shooting relevant to DTC indicated.
2.
CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
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
(The CAN communication line is open or
shorted.)
• Combination meter
• ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM
• ECM
P1574 ASCD VEHICLE SPEED SENSOR
EC-819
< COMPONENT DIAGNOSIS >
[VK56DE]
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BRC-21, "CONSULT-III Function (ABS)"
or
BRC-141, "CONSULT-III Function (ABS)"
.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
3.
CHECK COMBINATION METER FUNCTION
Check combination meter function.
Refer to
MWI-24, "CONSULT-III Function (METER/M&A)"
.
>> INSPECTION END
EC-820
< COMPONENT DIAGNOSIS >
[VK56DE]
P1805 BRAKE SWITCH
P1805 BRAKE SWITCH
Description
INFOID:0000000001537941
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.
On Board Diagnosis Logic
INFOID:0000000001537942
The MIL will not light up for this self-diagnosis.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode.
DTC Confirmation Procedure
INFOID:0000000001537943
WITH CONSULT-III
1.
Turn ignition switch ON.
2.
Fully depress the brake pedal for at least 5 seconds.
3.
Erase the DTC with CONSULT-III.
4.
Check 1st trip DTC.
5.
If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis Procedure
INFOID:0000000001537944
1.
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 SWITCH POWER SUPPLY CIRCUIT
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1805
1805
Brake switch
A brake switch signal is not sent to ECM for ex-
tremely long time while the vehicle is driving.
• Harness or connectors
(Stop lamp switch circuit is open or short-
ed.)
• Stop lamp switch
Engine operating condition in 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
When engine is idling
Normal
When accelerating
Poor acceleration
Brake pedal
Stop lamp
Fully released
Not illuminated
Depressed
Illuminated
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