Tacoma Extra Cab 2WD L4-2438cc 2.4L DOHC MFI (1997)
EGR Vacuum Modulator: Testing and Inspection
EGR VACUUM MODULATOR INSPECTION
1. DISCONNECT VACUUM HOSES FROM EGR VACUUM MODULATOR
2. INSPECT EGR VACUUM MODULATOR OPERATION
(a) Block ports P and R with your finger.
(b) Blow air into port Q, and check that the air passes through to the air filter side freely.
(d) Start the engine, and maintain speed at 3,000 rpm.
(e) 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.
3. RECONNECT VACUUM HOSES TO EGR VACUUM MODULATOR
