Nissan Sentra B18 (2020-2025) Service Manual: P1577 Ascd Brake Switch
Dtc Description
DTC DETECTION LOGIC
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DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
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P1577 |
ASCD BRAKE SW (ASCD brake switch) |
Diagnosis condition |
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Signal (terminal) |
Brake pedal position switch signal |
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Threshold |
Brake pedal position switch signal is "ON" for accumulative 10 hours. |
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Diagnosis delay time |
— |
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POSSIBLE CAUSE
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Harness or connectors
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Brake pedal position switch circuit is shorted.
-
-
Brake pedal position switch
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Incorrect brake pedal position switch installation
-
ECM
FAIL-SAFE
Engine Control System
Not applicable
Idle Start/Stop System
When a DTC is detected, the start/stop indicator lamp blinks slowly and the idle start/stop system operation is prohibited.
When ECM detects error while operating the idle start/stop system, ECM restarts the engine.
Confirmation Procedure
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PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
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Turn ignition switch OFF and wait at least 10 seconds.
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Turn ignition switch ON.
-
Turn ignition switch OFF and wait at least 10 seconds.
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.
GO TO 2.
-
-
CHECK BRAKE PEDAL POSITION SWITCH FUNCTION
With CONSULT-
Turn ignition switch ON.
-
Select “BRAKE SW” in “DATA MONITOR” mode of “ENGINE” with CONSULT.
- Check “BRAKE SW”
indication as per the following conditions.
Monitor item
Condition
Indication
BRAKE SW 1
Brake pedal
Slightly depressed
OFF
Fully released
ON
Without CONSULT-
Turn ignition switch ON.
- Check the voltage between ECM harness
connector terminals as per the following.
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
E16
150
162
Brake pedal
Slightly depressed
0 V
Fully released
Battery voltage
Is the inspection result normal?
YES-1 >>To check malfunction symptom before repair: Refer to Intermittent Incident.
YES-2 >>Confirmation after repair: INSPECTION END
NO >>Refer to DTC Diagnosis Procedure.
-
Dtc Diagnosis Procedure
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PERFORM BCM DIAGNOSIS
Perform BCM diagnosis. Refer to DTC Index.
Is the inspection result normal?
YES >>GO TO 2.
NO >>Repair or replace error-detected parts.
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CHECK BRAKE PEDAL POSITION SWITCH CIRCUIT
With CONSULT-
Turn ignition switch ON.
-
Select “BRAKE SW1” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
-
Check “BRAKE SW1” indication as per the following conditions.
Monitor item
Condition
Indication
BRAKE SW1
Brake pedal
Slightly depressed
OFF
Fully released
ON
Without CONSULT-
Turn ignition switch ON.
-
Check the voltage between ECM harness connector terminals as per the following.
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
E16
150
162
Brake pedal
Slightly depressed
0 V
Fully released
Battery voltage
Is the inspection result normal?
YES >>INSPECTION END
NO >>GO TO 3.
-
-
CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY CIRCUIT
-
Turn ignition switch OFF.
-
Disconnect brake pedal position switch harness connector.
-
Turn ignition switch ON.
-
Check the voltage between brake pedal position switch harness connector and ground.
+
−
Voltage
Brake pedal position switch
Connector
Terminal
E84
1
Ground
Battery voltage
Is the inspection result normal?
YES >>GO TO 4.
NO >>Perform the trouble diagnosis for power supply circuit.
-
-
CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT
-
Disconnect ECM harness connector.
-
Check the continuity between brake pedal position switch harness connector and ECM harness connector.
Brake pedal position switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E84
2
E16
150
Existed
-
Also check harness for short to ground and to power.
Is the inspection result normal?
YES >>GO TO 5.
NO >>Repair or replace malfunctioning part.
-
-
CHECK BRAKE PEDAL POSITION SWITCH
Check the brake pedal position switch. Refer to Component Inspection.
Is the inspection result normal?
YES >>INSPECTION END
NO >>Replace brake pedal position switch. Refer to Removal and Installation.
P1576 Ascd Brake Switch
Dtc Description
DTC Description
DTC DETECTION LOGIC
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CONSULT screen terms
(Trouble ...
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Dtc Description
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Active grille shutter normally stops within zone which
is defined by zone (90°±20°).
If the active grille shutter stops within ...
Other materials:
Starting System
System Description
System Description
SYSTEM DIAGRAM
System Description
“B” terminal is constantly supplied with 12V battery
power.
When starter operating condition is satisfied,
IPDM E/R turns starter relay ON by starter relay control sign ...
System description
Component parts
Component parts location
Ipdm e/r (contains ignition relay-1)
Bcm (view with instrument panel removed)
Fuse block (j/b) (front)
Fuse block (j/b) (back)
Blower relay
Ignition relay-2
Accessory relay-1
Push-button ignition switch
Component description
...
Parking brake control
Exploded View
Parking brake lever assembly
Adjusting nut
Parking brake switch
Front parking brake cable
Rear parking brake cable (LH)
Rear parking brake cable (RH)
Front
Removal and Installation
REMOVAL
Parking Brake Control
Remove rear wheels and t ...
