QWS System Malfunction

QWS System Malfunction










INSPECTION

1. Exhaust Throttle Valve
Working
Actuate the exhaust brake with the engine idling and make sure that you hear the valve strike on the stopper.

Unit
apply a negative pressure of -53.3 kPa - -93.3 kPa {-400 mmHg - -700 mmHg} to the power chamber by means of a vacuum pump and make sure of the smooth opening/closing of the exhaust brake valve.







Apply a negative pressure of -86.7 - -93.3 kPa {-650 - -700 mmHg} to the power chamber using a vacuum pump and make sure the average of measurements at Point A and Point B of the clearance between valve and body is as follows:
0.4 mm - 0.6 mm (Minimum: 0.4 mm)
If the clearance is out of this range adjust with the adjusting bolt.







2. Intake Throttle Valve
Working
Disconnect the vacuum hose from the actuator and try to move the rod by hand making sure of the smooth move of the rod.







3. Exhaust Brake Magnetic Valve
Inspection
Connect the magnetic valve connector terminal No.1 and No.2 to (+) terminal and (-) terminal of battery respectively and check the continuity between the ports.







4. Accelerator Switch (2-pole connector type)
Inspection
1. Check the continuity between the switch connector terminals.
2. Check the smooth move of the push rod. If the check result is abnormal, repair or replace the pushrod.

CAUTION: When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.







Removal
1. Accelerator Switch
Disconnect the connector.
Loosen the lock nut.
Turn the switch to remove.

Reinstallation
To install, follow the removal procedure in reverse order:
1. Drive the threaded part of the switch until its end surface becomes flush with that of the bracket side of nut
2. Tighten the lock nut.

Tightening torque: 1.3 N.m {130 kg.cm}

5. Thermosensor (ECT)
Soak the temperature sensitive part of a thermosensor in the water, and while changing the water temperature, make sure the resistance is changed as the following graph shows:










6. Vacuum Switching Valve; Intake Throttle
Inspection
Connect the vacuum switching valve connector terminals No.1 and No.2 to (+) terminal and (-) terminals of battery respectively, and check the continuity between the ports.
If the check result is abnormal, repair or replace the valve.







CAUTION: When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.