ECM Controlled VSV

An ECM controlled VSV is located in-line with the vacuum signal to the PAIR valve. It is a normally closed VSV that is switched on by the ECM during conditions when emission production is high and fresh air is needed to promote emission oxidation. A resonator is located at the air intake and is used to baffle air pulsation that normally occurs during system operation.

PAIR System Operating Strategy

PAIR operating strategy varies between different engine applications; therefore, refer to the Repair Manual for exact system operating parameters. An example of a typical program strategy (Truck with 22R-E engine) allows secondary air flow during the following conditions:

• Cold engine operation; when coolant temperature is below 86' F and engine speed is below 3600 rpm

• Deceleration; when either of the following conditions are met:

-coolant temperature above 140'F, IDL on, and vehicle speed above 2 mph -coolant temperature above 140'F, IDL on, vehicle speed below 2 mph, and engine speed above 2,500 rpm

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Responses

  • AGOSTINA ONIO
    How to test signal from ecm to vsv on 2000 toyota camry v6?
    3 months ago

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