Infiniti M35/M45 Y50. Manual - part 708

DTC P1800 VIAS CONTROL SOLENOID VALVE

EC-1305

[VK45DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

2. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E12, F3

●

Harness for open or short between VIAS control solenoid valve and IPDM E/R

>> Repair harness or connectors.

3. 

CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 29 and VIAS control solenoid valve terminal 2.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 4.

NG

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

4. 

CHECK VIAS CONTROL SOLENOID VALVE

Refer to 

EC-1305, "Component Inspection"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Replace VIAS control solenoid valve.

5. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

NBS005NK

VIAS CONTROL SOLENOID VALVE

 With CONSULT-II

1.

Reconnect harness connectors disconnected.

2.

Turn ignition switch ON.

3.

Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode.

4.

Check air passage continuity and operation delay time under the
following conditions.

Operation takes less than 1 second.

Continuity should exist.

Condition

VIAS SOL VALVE

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

ON

Yes

No

OFF

No

Yes

PBIB0177E

EC-1306

[VK45DE]

DTC P1800 VIAS CONTROL SOLENOID VALVE

 Without CONSULT-II

Check air passage continuity and operation delay time under the fol-
lowing conditions.

Operation takes less than 1 second.

Removal and Installation

NBS005NL

VIAS CONTROL SOLENOID VALVE

Refer to 

EM-179, "INTAKE MANIFOLD"

 .

Condition

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

12V direct current supply 
between terminals 1 and 2

Yes

No

No supply

No

Yes

SEF313Q

DTC P1805 BRAKE SWITCH

EC-1307

[VK45DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC P1805 BRAKE SWITCH

PFP:25320

Component Description

NBS005NM

Brake switch signal is applied to the ECM through the stop lamp
switch (1) when the brake pedal is depressed. This signal is used
mainly to decrease the engine speed when the vehicle is driving.

●

ICC brake switch (models with ICC) (2)

●

ASCD brake switch (models with ASCD) (2)

CONSULT-II Reference Value in Data Monitor Mode

NBS005NN

Specification data are reference values.

On Board Diagnosis Logic

NBS005NO

The MIL will not light up for this diagnosis.

FAIL-SAFE MODE

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

PBIB2705E

MONITOR ITEM

CONDITION

SPECIFICATION

BRAKE SW

●

Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1805
1805

Brake switch

A brake switch signal is not sent to ECM for 
extremely long time while the vehicle is driving.

●

Harness or connectors
(Stop lamp switch circuit is open or 
shorted.)

●

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

EC-1308

[VK45DE]

DTC P1805 BRAKE SWITCH

DTC Confirmation Procedure

NBS005NP

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Fully depress the brake pedal for at least 5 seconds.

3.

Erase the DTC with CONSULT-II.

4.

Select “DATA MONITOR” mode with CONSULT-II.

5.

If 1st trip DTC is detected, go to 

EC-1310, "Diagnostic Proce-

dure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

SEF058Y