Po660 means "Intake Manifold Tuning Valve Control Circuit/Open".it't means as same as "Engine Light ON (or Service Engine Soon Warning Light".The Intake Manifold Tuning Valve (IMTV) system is monitored for failure during continuous, key ON engine OFF or key ON engine running self-test. The test fails when the signal on the monitor pin is more or less than an the expected calibrated range
what is the reason?
1,IMTV signal circuit open, shorted to power or ground.
2, Damaged IMTV actuator.
3,Damaged PCM.
you may learn more definition about Diagnostic Trouble Code (DTC) at:
http://www.uobd2.com/upload/service/diagnostic-trouble-code-table.pdf
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