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Home >> Jeep >> 1969 >> Commando 2.2L Eng >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Exhaust Gas RECIRCULATION >> Maintenance & Testing >> CTO Switch

CTO Switch

Check vacuum lines for leaks and correct routing.

NOTE: Engine coolant temperature must be below 100°F to perform test.

Disconnect vacuum line at EGR valve and connect vacuum gauge to line. Operate engine at approximately 1500 RPM; no vacuum should be indicated on gauge. If vacuum is indicated, replace CTO switch. Operate engine until coolant temperature exceeds 115°F. Accelerate engine to 1500 RPM; carburetor ported vacuum should be indicated on vacuum gauge. If not replace CTO switch.

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