Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Exhaust Gas Recirculation: Testing and Inspection





1. Disconnect the vacuum hose (green-striped) from the EGR valve, and connect the hand vacuum pump through the three-way terminal.
2. Regarding cold condition [coolant temperature: 20°C (68°F) or less] and warm condition [coolant temperature: 70°C (68°F) or more] of the engine, check the following two points:

















3. Disconnect the three-way terminal, and connect the hand vacuum pump to the EGR valve.
4. When a negative pressure of 215 mmHg (8.5 in.Hg.) is applied during idling, check that the engine stops or idles unstably.