EGR Backpressure Transducer: Testing and Inspection

1. INSPECT AND CLEAN FILTER IN EGR VACUUM MODULATOR
- Remove the cap and filter.
- Check the filter for contamination or damage.
- Using compressed air, clean the filter
- Reinstall the filter and cap.

HINT: Install the filter with the coarser surface facing the atmospheric side (outward).





2. INSTALL VACUUM GAUGE
- Using a 3-way connector, connect a vacuum gauge to the hose between the EGR valve and EGR vacuum modulator.





3. CONNECT TOYOTA HAND-HELD TESTER OR OBD II SCAN TOOL
- Connect the TOYOTA hand-held tester or OBD II scan tool to the DLC3.

Please refer to the TOYOTA hand-held tester or OBD II scan tool operators manual for further details.

4. INSPECT OPERATION OF VSV AND EGR VACUUM MODULATOR
- Select the active test mode on the TOYOTA hand-held tester (VSV is closed.).





- If you have no TOYOTA hand-held tester, check these procedures:
(1) Remove the 3-way connector with the vacuum hose.
(2) Connect the vacuum hose (from port Q of EGR vacuum modulator) to the EGR valve.
(3) Plug the vacuum hose (from VSV for EGR).
- Check that the vacuum gauge indicates low vacuum at 3,000 rpm.
5. DISCONNECT TOYOTA HAND-HELD TESTER OR OBD II SCAN TOOL
6. REMOVE VACUUM GAUGE





7. INSPECT EGR VACUUM MODULATOR OPERATION
- Block ports P and R with your finger.
- Blow air into port Q, and check that the air passes through to the air filter side freely.
- Start the engine, and maintain speed at 3,000 rpm.
- Repeat the above test. Check that there is a strong resistance to air flow.
- If operation is not as specified, replace the EGR vacuum modulator.
8. RECONNECT VACUUM HOSES TO EGR VACUUM MODULATOR