Nissan Sentra B18 (2020-2025) Service Manual: P1576 Ascd Brake Switch

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P1576 Ascd Brake Switch

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1576	ASCD BRAKE SW (ASCD brake switch)	Diagnosis condition	Park/neutral position (PNP) switch OFF Engine running at idle
		Signal (terminal)	Brake pedal position switch signal
		Threshold	Brake pedal position switch signal is "OFF" for accumulative 10 hours.
		Diagnosis delay time	—

POSSIBLE CAUSE

Harness or connectors
- Brake pedal position switch circuit is disconnected.
Brake pedal position switch
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

Confirmation Procedure

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure 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.
  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
BRAKE SW 1	Brake pedal	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	+	–
Connector	Terminal
E16	150	162	Brake pedal	Slightly depressed	0 V
E16	150	162	Brake pedal	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

DTC Diagnosis Procedure

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.

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
BRAKE SW1	Brake pedal	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	+	–
Connector	Terminal
E16	150	162	Brake pedal	Slightly depressed	0 V
E16	150	162	Brake pedal	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	Continuity
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.

P1575 Brake Switch

Dtc Description DTC Description DTC DETECTION LOGIC DTC CONSULT screen terms (Trouble ...

P1577 Ascd Brake Switch

Dtc Description DTC Description DTC DETECTION LOGIC DTC CONSULT screen terms (Trouble ...

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