Nissan Maxima. Manual - part 490

EC-444

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1800 VIAS CONTROL SOLENOID VALVE 1

4. Check air passage continuity and operation delay time under the

following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace VIAS control solenoid valve 1. Refer to 

EM-25,

"Removal and Installation"

.

Condition

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

12 V direct current supply be-
tween terminals 1 and 2

Existed

Not existed

No supply

Not existed

Existed

PBIB2532E

P1801 VIAS CONTROL SOLENOID VALVE 2

EC-445

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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P1801 VIAS CONTROL SOLENOID VALVE 2

Description

INFOID:0000000010095146

The VIAS control solenoid valve 2 cuts the intake manifold vacuum signal for power valve 2 control. It

responds to ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum signal from the intake

manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and sends the vac-

uum signal to the power valve actuator 2.

DTC Logic

INFOID:0000000010095147

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 let it idle for at least 5 seconds.

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

YES

>> Go to 

EC-445, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010095148

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

1.

CHECK VIAS CONTROL SOLENOID VALVE 2 POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect VIAS control solenoid valve 2 harness connector.

3. Turn ignition switch ON.

4. Check the voltage between VIAS control solenoid valve 2 har-

ness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

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

harness or connectors.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1801

VIAS control solenoid valve 2 
circuit

An excessively low or high voltage signal 
is sent to ECM via the VIAS control sole-
noid valve 2.

• Harness or connectors

(The solenoid valve 2 circuit is open or 
shorted.)

• VIAS control solenoid valve 2

VIAS control solenoid valve 2

Ground

Voltage

Connector

Terminal

F65

1

Ground

Battery voltage

PBIB0080E

EC-446

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1801 VIAS CONTROL SOLENOID VALVE 2

2.

CHECK VIAS CONTROL SOLENOID VALVE 2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between VIAS control solenoid valve 2 harness connector and ECM harness con-

nector.

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

YES

>> GO TO 3.

NO

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

3.

CHECK VIAS CONTROL SOLENOID VALVE 2

Refer to 

EC-446, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace VIAS control solenoid valve 2.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000010095149

1.

CHECK VIAS CONTROL SOLENOID VALVE 2

With CONSULT

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Disconnect vacuum hoses connected to VIAS control solenoid valve 2.

4. Turn ignition switch ON.

5. Select “VIAS S/V-2” in “ACTIVE TEST” mode with CONSULT.

6. Check air passage continuity and operation delay time under the

following conditions.

Without CONSULT

1. Turn ignition switch OFF.

2. Disconnect VIAS control solenoid valve 2 harness connector.

3. Disconnect vacuum hoses connected to VIAS volume control solenoid valve 2.

VIAS control solenoid valve 2

ECM

Continuity

Connector

Terminal

Connector

Terminal

F65

2

F14

26

Existed

Condition

(VIAS S/V 2)

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

ON

Existed

Not existed

OFF

Not existed

Existed

JMBIA0180ZZ

P1801 VIAS CONTROL SOLENOID VALVE 2

EC-447

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4. Check air passage continuity and operation delay time under the

following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace VIAS control solenoid valve 2

Condition

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

12 V direct current supply be-
tween terminals 1 and 2

Existed

Not existed

No supply

Not existed

Existed

PBIB2532E