Nissan Teana J32. Manual - part 438

EC-290

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

P1801 VIAS CONTROL SOLENOID VALVE 2

NO

>> Replace VIAS control solenoid valve 2

P1805 BRAKE SWITCH

EC-291

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

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P1805 BRAKE SWITCH

Description

INFOID:0000000003856776

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 driver.

DTC Logic

INFOID:0000000003856777

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Fully depress the brake pedal for at least 5 seconds.

3.

Erase the DTC.

4.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-291, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003856778

1.

CHECK STOP LAMP SWITCH CIRCUIT

1.

Turn ignition switch OFF.

2.

Check the stop lamp when depressing and releasing the brake pedal.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Disconnect stop lamp switch harness connector.

2.

Check the voltage between stop lamp switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E103
• 10A fuse (No.7)

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1805

Brake switch

A brake switch signal is not sent to ECM for ex-
tremely long time while the vehicle is being driv-
er.

• Harness or connectors

(Stop lamp switch circuit is open or short-
ed.)

• Stop lamp switch

Brake pedal

Stop lamp

Fully released

Not illuminated

Slightly depressed

Illuminated

Stop lamp switch

Ground

Voltage

Connector

Terminal

E115

1

Ground

Battery voltage

EC-292

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

P1805 BRAKE SWITCH

• Harness for open or short between battery and stop lamp switch

>> Repair open circuit, 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 stop lamp switch harness connector.

2.

Disconnect ECM harness connector.

3.

Check the continuity between stop lamp switch harness connector and ECM harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E103
• Harness for open or short between ECM and stop lamp switch

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

6.

CHECK STOP LAMP SWITCH 

Refer to 

EC-292, "Component Inspection (Stop Lamp Switch)"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace stop lamp switch.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-35, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (Stop Lamp Switch)

INFOID:0000000003858144

1.

CHECK STOP LAMP SWITCH-I

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

3.

Check harness continuity between stop lamp switch terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH-II

1.

Adjust stop lamp switch installation. Refer to 

BR-6, "Inspection and Adjustment"

.

2.

Check harness continuity between stop lamp switch terminals under the following conditions.

Stop lamp switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E115

2

E16

106

Existed

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

P1805 BRAKE SWITCH

EC-293

< COMPONENT DIAGNOSIS >

[VQ25DE, VQ35DE]

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Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace stop lamp switch.

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Not existed

Slightly depressed

Existed