Nissan Sentra. Manual - part 428

EC-408

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P1800 INTAKE MANIFOLD TUNING VALVE

P1800 INTAKE MANIFOLD TUNING VALVE 

DTC Logic

INFOID:0000000009758665

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing 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.

TESTING CONDITION:

Before performing the following procedure, confirm battery voltage is more than 11 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and warm it up to the normal operating temperature. [more than 60

°C (140°F)]

2. Let it idle for at least 10 seconds. (engine speed: less than 1,000 rpm)

3. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-408, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009758666

1.

CHECK INTAKE MANIFOLD TUNING VALVE MOTOR POWER SUPPLY

1. Turn ignition switch ON.

2. Check the voltage between ECM harness connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK INTAKE MANIFOLD TUNING VALVE MOTOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect IPDM E/R harness connector.

4. Check the continuity between ECM harness connector and IPDM E/R harness connector.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1800

VIAS S/V-1
(Variable intake air system con-
trol solenoid valve-1)

An excessively low or high voltage signal 
is sent to ECM through the intake manifold 
tuning valve.

• Harness or connectors

(The solenoid valve 1 circuit is open or 
shorted.)

• Intake manifold tuning valve

ECM

Voltage

+

-

Connector

Terminal

Connector

Terminal

F24

6

E16

128

Battery voltage

P1800 INTAKE MANIFOLD TUNING VALVE

EC-409

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

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5. Also check harness for short to ground.
Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

3.

CHECK INTAKE MANIFOLD TUNING VALVE MOTOR OUTPUT SIGNAL CIRCUIT

1. Disconnect intake manifold tuning valve motor harness connector.

2. Check the continuity between intake manifold tuning valve motor harness connector and ECM harness

connector.

3. Also check harness for short to ground and to power.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK INTAKE MANIFOLD TUNING VALVE MOTOR

Check the intake manifold tuning valve motor. Refer to 

EC-409, "Component Inspection (Intake Manifold Tun-

ing Valve)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Replace intake manifold assembly. Refer to 

EM-27, "Removal and Installation"

.

Component Inspection (Intake Manifold Tuning Valve)

INFOID:0000000009758667

1.

CHECK INTAKE MANIFOLD TUNING VALVE MOTOR

1. Turn ignition switch OFF.

2. Disconnect intake manifold tuning valve motor harness connector.

3. Check the resistance between intake manifold tuning valve motor terminals as per the following.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace intake manifold. Refer to 

EM-27, "Removal and Installation"

.

+

−

Continuity

ECM

IPDM E/R

Connector

Terminal

Connector

Terminal

F24

6

E45

26

Existed

+

−

Continuity

Intake manifold tuning valve 

motor

ECM

Connector

Terminal

Connector

Terminal

F56

1

F24

5

Existed

7

Not existed

2

5

Not existed

7

Existed

IMT valve motor

Resistance

(Approx.)

+

−

Terminals

1

2

3 - 8 

Ω [at 25°C (77°F)]

EC-410

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P1805 BRAKE SWITCH

P1805 BRAKE SWITCH

DTC Logic

INFOID:0000000009758668

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

NOTE:

Since this DTC is difficult to be confirmed, check component function to judge the normality.

>> Proceed to 

EC-410, "Component Function Check"

.

Component Function Check

INFOID:0000000009758669

1.

CHECK BRAKE SWITCH FUNCTION

With CONSULT

1. On the CONSULT screen, select “ENGINE” >> “DATA MONITOR” >> “BRAKE SW 2”.

2. Check “STOP LAMP SW” indication under the following conditions.

Without CONSULT

1. Turn ignition switch ON.

2. Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-410, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009758670

1.

CHECK STOP LAMP SWITCH OPERATION

1. Turn power switch OFF.

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

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1805

BRAKE SW/CIRCUIT
(Brake switch circuit)

Stop lamp signal is not sent to ECM for ex-
tremely long time while the vehicle is driving.

• Harness or connectors

(Stop lamp switch circuit is open or 
shorted.)

• Stop lamp switch

Monitor item

Condition

Indication

STOP LAMP SW

Brake pedal

Slightly depressed

ON

Fully released

OFF

ECM

Condition

Voltage

(Approx.)

Connector

+

–

Terminal

Terminal

E16

115

128

Brake pedal

Slightly depressed

Battery voltage

Fully released

0 V

Brake pedal

Stop lamp

Fully released

Not illuminated

Slightly depressed

Illuminated

P1805 BRAKE SWITCH

EC-411

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

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Is the inspection result normal?

YES

>> GO TO 5. 

NO

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH POWER SUPPLY

1. Disconnect stop lamp switch harness connector.

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

3. Also check harness for short to ground.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1. Pull out #30 fuse.

2. Check that the fuse is not fusing.

3. Check the continuity between stop lamp switch harness connector and fuse terminal.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> Check power supply circuit for 12V battery power supply.

NO

>> Repair or replace error-detected parts.

4.

CHECK STOP LAMP SWITCH 

Check stop lamp switch. Refer to 

EC-412, "Component Inspection (Stop Lamp Switch)"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace stop lamp switch. Refer to 

BR-22, "Exploded View"

.

5.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT

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.
Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

+

−

Voltage

Stop lamp switch

Connector

Terminal

E60

1

Ground

Battery voltage

+

−

Continuity

Stop lamp switch

Connector

Terminal

E60

1

#30 fuse ter-

minal

Existed

+

−

Continuity

Stop lamp switch

ECM

Connector

Terminal

Connector

Terminal

E60

2

E16

115

Existed