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Vacuum Switching Valve (VSV) for EGR <--> [EGR Control Solenoid] > < EGR Vacuum Modulator <--> [EGR Backpressure Transducer]|Locations|Page 2377

T100 Pickup 4WD V6-180.5 2959cc 3.0L SOHC (3VZ-E) (1993)

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EGR Vacuum Modulator: Testing and Inspection

INSPECTION

1. Warm engine up to operating temperature. Turn engine off. Disconnect the vacuum hoses from ports P, Q and R of the Exhaust Gas Recirculation 

(EGR) Vacuum Modulator.

2. Plug ports P and R with your finger.

Testing The Exhaust Gas Recirculation Vacuum Modulator.

3. Blow air into port Q. Check that the air passes through to the air filter side freely.

Testing The Exhaust Gas Recirculation Vacuum Modulator.

4. Start the engine and maintain speed at 3,5OOrpm.
5. Repeat the above test. Check that there is a strong resistance to air flow.
6. Reconnect the vacuum hoses to the proper locations. If a problem is found, replace the EGR Vacuum Modulator.

Vacuum Switching Valve (VSV) for EGR <--> [EGR Control Solenoid] > < EGR Vacuum Modulator <--> [EGR Backpressure Transducer]|Locations|Page 2377