EGR Vacuum Modulator Test
WARNING: This page is about a different car, the 1990 Toyota Land Cruiser and 1989 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
- EGR vacuum modulator may be a 2-port or 3-port depending on application. On 2 port models, disconnect hoses from vacuum modulator. Plug one end of vacuum hose connection on EGR vacuum modulator.
- Apply air pressure through remaining port. Air should pass freely through air filter side of modulator. On 3-port models, disconnect all hoses. Block ports "P" and "R". Apply air pressure to port "Q". See Fig 1. Air should pass through the air filter side of modulator freely.
- On all models, operate engine at 2500 RPM. Repeat previous test procedure in steps 1) and 2). Strong resistance of airflow should be felt. Replace EGR vacuum modulator if resistance is not felt. Reconnect vacuum hoses to proper locations
EGR VACUUM MODULATOR SPECIFICATIONS
| Application | Engine RPM | |
|---|---|---|
| 3-Port Type | ||
| Land Cruiser | 2500 | |