Nissan Maxima Service and Repair Manual: Variable induction air system

Description

Power Valves 1 and 2
The power valves 1 and 2 are installed in intake manifold collector and used to control the suction passage of the variable induction air control system. They are set in the fully closed or fully opened position by the power valve actuators 1 and 2 operated by the vacuum stored in the vacuum tank. The vacuum to power valve actuators is controlled by the VIAS control solenoid valves 1 and 2.

Component Function Check

1.CHECK OVERALL FUNCTION-I

With CONSULT

1. Start engine and warm it up to the normal operating temperature.
2. Perform "VIAS S/V-1" in "ACTIVE TEST" mode with CONSULT.
3. Turn VIAS control solenoid valve 1 "ON" and "OFF", and check that power valve actuator 1 rod moves.

1. Power valve actuator 1
2. Power valve actuator 1 rod
3. Power valve actuator 2 rod
4. Power valve actuator 2
   : Vehicle front

Without CONSULT

1. Start engine and warm it up to the normal operating temperature.
2. When revving engine up to 5,000 rpm quickly.
3. Check that power valve actuator 1 rod moves under the following conditions.

1. Power valve actuator 1
2. Power valve actuator 1 rod
3. Power valve actuator 2 rod
4. Power valve actuator 2
   : Vehicle front

2.CHECK OVERALL FUNCTION-II

With CONSULT

1. Perform "VIAS S/V-2" in "ACTIVE TEST" mode with CONSULT.
2. Turn VIAS control solenoid valve 2 "ON" and "OFF", and check that power valve actuator 2 rod moves.

1. Power valve actuator 1
2. Power valve actuator 1 rod
3. Power valve actuator 2 rod
4. Power valve actuator 2
   : Vehicle front

Without CONSULT

1. When revving engine up to 5,000 rpm quickly.
2. Check that power valve actuator 2 rod moves under the following conditions.

1. Power valve actuator 1
2. Power valve actuator 1 rod
3. Power valve actuator 2 rod
4. Power valve actuator 2
   : Vehicle front

Diagnosis Procedure

1.INSPECTION START

Confirm the malfunctioning system (power valve 1 or power valve 2).

2.CHECK VACUUM EXISTENCE-I

With CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator 1.
2. Start engine and let it idle.
3. Perform "VIAS S/V-1" in "ACTIVE TEST" mode with CONSULT.
4. Turn VIAS control solenoid valve 1 "ON" and "OFF", and check vacuum existence under the following conditions.

Without CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator 1.
2. Disconnect VIAS control solenoid valve 1 harness connector.
3. Start engine.
4. When revving engine up to 5,000 rpm quickly.
5. Check vacuum existence under the following conditions.

3.CHECK VACUUM TANK

1. Stop engine and disconnect vacuum hose connected to intake manifold collector.
2. Start engine and let it idle.
3. Check vacuum existence from intake manifold collector.

4.CHECK VACUUM HOSE

1. Stop engine.
2. Check vacuum hose for cracks, clogging, improper connection or disconnection.

5.CHECK VIAS CONTROL SOLENOID VALVE 1

6.CHECK VACUUM EXISTENCE-II

With CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator 2.
2. Start engine and let it idle.
3. Perform "VIAS S/V-2" in "ACTIVE TEST" mode with CONSULT.
4. Turn VIAS control solenoid valve 2 "ON" and "OFF", and check vacuum existence under the following conditions.

Without CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator 2.
2. Disconnect VIAS control solenoid valve 1 harness connector.
3. Start engine.
4. When revving engine up to 5,000 rpm quickly.
5. Check vacuum existence under the following conditions.

7.CHECK VACUUM HOSE

1. Stop engine.
2. Check vacuum hose for cracks, clogging, improper connection or disconnection.

8.CHECK VIAS CONTROL SOLENOID VALVE 2

9.CHECK INTERMITTENT INCIDENT