Nissan Murano: Dtc/circuit Diagnosis / P1800 Vias Control Solenoid Valve 1

DTC Description

DTC DETECTION LOGIC

An excessively low or high voltage signal is sent to ECM through the VIAS control solenoid valve 1.

POSSIBLE CAUSE

• Harness or connectors

  (Input speed sensor circuit is open or shorted)

• VIAS control solenoid valve 1

FAIL-SAFE

Not applicable

CONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting 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.

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?

Proceed to Diagnosis Procedure.

To check malfunction symptom before repair: Refer to Intermittent Incident.

Confirmation after repair: INSPECTION END

CHECK VIAS CONTROL SOLENOID VALVE 1 POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect VIAS control solenoid valve 1 harness connector.

3. Turn ignition switch ON.

4. Check the voltage between VIAS control solenoid valve 1 harness connector and ground.

   VIAS control solenoid valve 1		Ground	Voltage
   Connector	Terminal
   F63	1	Ground	Battery voltage

Is the inspection result normal?

GO TO 2.

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

CHECK VIAS CONTROL SOLENOID VALVE 1 OUTPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between VIAS control solenoid valve 1 harness connector and ECM harness connector.

   VIAS control solenoid valve 1		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F63	2	F79	108	Existed

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

Is the inspection result normal?

GO TO 3.

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

CHECK VIAS CONTROL SOLENOID VALVE 1

Check VIAS control solenoid valve 1. Refer to Component Inspection.

Is the inspection result normal?

INSPECTION END

Replace VIAS control solenoid valve 1. Refer to Component Parts Location.

CHECK VIAS CONTROL SOLENOID VALVE 1

With CONSULT

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Disconnect vacuum hoses connected to VIAS control solenoid valve 1.

4. Turn ignition switch ON.

5. Select “VIAS S/V-1” in “ACTIVE TEST” mode with CONSULT.

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

Condition (VIAS S/V-1)	Air passage continuity between and	Air passage continuity between and
ON	Existed	Not existed
OFF	Not existed	Existed

Without CONSULT

1. Turn ignition switch OFF.

2. Disconnect VIAS control solenoid valve 1 harness connector.

3. Disconnect vacuum hoses connected to VIAS volume control solenoid valve 1.

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

   

Condition	Air passage continuity between and	Air passage continuity between and
12 V direct current supply between terminals 1 and 2	Existed	Not existed
No supply	Not existed	Existed

Is the inspection result normal?

INSPECTION END

Replace VIAS control solenoid valve 1. Refer to Component Parts Location.