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EGRC-BPT Valve And System:

OPERATION
The EGRC-BPT valve monitors exhaust pressure to activate the diaphragm, controlling throttle body vacuum applied to the EGR valve. In other words, recirculated exhaust gas is controlled in response to positioning of the EGR valve or to engine operation.

ON-BOARD DIAGNOSIS LOGIC
If the excess EGR flow exists due to the EGRC-BPT valve malfunction, the engine roughness will be increased. If the roughness is large, then the vacuum to the EGR valve is interrupted through the EGR & canister control solenoid valve. If the engine roughness is reduced at that time, the EGRC-BPT valve malfunction is indicated.