Nissan Frontier D40. Manual - part 530

P1805 BRAKE SWITCH

EC-811

< COMPONENT DIAGNOSIS >

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P1805 BRAKE SWITCH

Description

INFOID:0000000005273819

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 being driven.

On Board Diagnosis Logic

INFOID:0000000005273820

The MIL will not illuminate for this diagnosis.

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode.

DTC Confirmation Procedure

INFOID:0000000005273821

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.
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 

EC-811, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005273822

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 being driv-
en.

• 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

Slightly depressed

Illuminated

EC-812

< COMPONENT DIAGNOSIS >

[VQ40DE]

P1805 BRAKE SWITCH

1.

Disconnect stop lamp switch harness connector.

2.

Check voltage between stop lamp switch terminal 1 and ground
with CONSULT-III or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• 10 A fuse (No.20)
• Fuse block (J/B) connector E160
• Harness for open and short between stop lamp switch and battery

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Disconnect stop lamp switch harness connector.

3.

Check harness continuity between ECM terminal 101 and stop
lamp 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 5.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

5.

CHECK STOP LAMP SWITCH 

Refer to 

EC-813, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> Replace stop lamp switch.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

>> INSPECTION END

BBIA0560E

Voltage: Battery voltage

PBIB1184E

Continuity should exist.

BBIA0560E

P1805 BRAKE SWITCH

EC-813

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Component Inspection

INFOID:0000000005273823

STOP LAMP SWITCH

1.

Disconnect stop lamp switch harness connector.

2.

Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.

3.

If NG, adjust stop lamp switch installation, refer to 

BR-19, "Inspection and Adjustment"

, and perform step

2 again.

BBIA0560E

Conditions

Continuity

Brake pedal: Fully released

Should not exist.

Brake pedal: Slightly depressed

Should exist.

PBIB2285E

EC-814

< COMPONENT DIAGNOSIS >

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P2100, P2103 THROTTLE CONTROL MOTOR RELAY

P2100, P2103 THROTTLE CONTROL MOTOR RELAY

Component Description

INFOID:0000000005273824

Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle
control motor relay is controlled ON/OFF by the ECM. When the ignition switch is turned ON, the ECM sends
an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition
switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not
provided to the ECM.

On Board Diagnosis Logic

INFOID:0000000005273825

These self-diagnoses have the one trip detection logic.

FAIL-SAFE MODE

When the malfunction is detected, ECM enters fail-safe mode and the MlL illuminates.

DTC Confirmation Procedure

INFOID:0000000005273826

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.

PROCEDURE FOR DTC P2100

1.

Turn ignition switch ON and wait at least 2 seconds.

2.

Start engine and let it idle for 5 seconds.

3.

Check 1st trip DTC.

4.

If DTC is detected, go to 

EC-814, "Diagnosis Procedure"

.

PROCEDURE FOR DTC P2103

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8V.
1.

Turn ignition switch ON and wait at least 1 second.

2.

Check DTC.

3.

If DTC is detected, go to 

EC-814, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005273827

1.

CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P2100
2100

Throttle control motor 
relay circuit open

ECM detects that the voltage of power source 
for throttle control motor is excessively low.

• Harness or connectors

(Throttle control motor relay circuit is 
open)

• Throttle control motor relay

P2103
2103

Throttle control motor 
relay circuit short

ECM detects that the throttle control motor relay 
is stuck ON.

• Harness or connectors

(Throttle control motor relay circuit is 
shorted)

• Throttle control motor relay

Engine operating condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return 
spring.