Throttle Modulator Diaphragm Check
- Disconnect vacuum line from diaphragm. Connect external vacuum source to diaphragm. Apply and trap 19 in. Hg.
- If diaphragm does not respond, or will not hold vacuum, replace the diaphragm.
- Remove external vacuum source. If the diaphragm does not return within 5 seconds, replace the diaphragm. Reconnect vacuum line.