Nissan Sentra B18 (2020-2025) Service Manual: P1805 Brake Switch
Dtc Description
DTC Description
DTC DETECTION LOGIC
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DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
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P1805 |
BRAKE SW/CIRCUIT (Brake switch circuit) |
Diagnosis condition |
— |
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Signal (terminal) |
Brake pedal position switch signal |
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Threshold |
A brake pedal position switch signal is not sent to ECM while the Nissan Sentra vehicle is driving |
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Diagnosis delay time |
— |
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POSSIBLE CAUSE
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Harness or connectors (Brake pedal position switch circuit is open or shorted.)
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Brake pedal position switch
FAIL-SAFE
Engine Control System
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Engine operating condition in fail-safe mode |
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|---|---|---|---|
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Fail safe mode |
Nissan Sentra Vehicle behavior |
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Others |
ECM controls the electric throttle control actuator by regulating the throttle opening to a small range. Therefore, acceleration will be poor. |
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Nissan Sentra Vehicle condition |
Driving condition |
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When engine is idling |
Normal |
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When accelerating |
Poor acceleration |
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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
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PERFORM COMPONENT FUNCTION CHECK
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Turn ignition switch ON.
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Fully depress the brake pedal for at least 5 seconds.
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Erase the DTC. Refer to Diagnosis Description.
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Check 1st trip DTC.
Is 1st trip DTC detected?
YES >>Refer to DTC Diagnosis Procedure.
NO-1 >>To check malfunction symptom before repair: Refer to Intermittent Incident.
NO-2 >>Confirmation after repair: INSPECTION END
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Dtc Diagnosis Procedure
DTC Diagnosis Procedure
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CHECK BRAKE PEDAL POSITION SWITCH CIRCUIT
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Turn ignition switch OFF.
-
Depress the brake pedal and check the stop lamp when releasing.
Brake pedal
Stop lamp
Fully released
Not illuminated
Slightly depressed
Illuminated
Is the inspection result normal?
YES >>GO TO 3.
NO >>GO TO 2.
-
-
CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY
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Disconnect brake pedal position switch harness connector.
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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 3.
NO >>Perform the trouble diagnosis for power supply circuit.
-
-
CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT
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Disconnect brake pedal position switch harness connector.
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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 4.
NO >>Repair or replace malfunctioning part.
-
-
CHECK BRAKE PEDAL POSITION SWITCH
Check brake pedal position switch. Refer to Component Inspection.
Is the inspection result normal?
YES >>INSPECTION END
NO >>Replace brake pedal position switch. Refer to Exploded View.
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Dtc Description
DTC Description
DTC DETECTION LOGIC
DTC
CONSULT screen terms
(Trouble diagnosis
content)
DTC detection
...
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Dtc Description
DTC Description
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between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage
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time.
MALFUNCTION A
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Dtc Description
DTC Description
DTC DETECTION LOGIC
DTC
CONSULT screen terms
(Trouble diagnosis
content)
DTC detection
condition
...