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EGR vacuum solenoid circuit fault
Exhaust gas recirculation valve fault
Code 16 Air temperature sensor fault
Evaporative canister purge control valve circuit fault
coolant temp sensor fault
a problem with the throttle potentiometer
mass air flow bad
Evaporative canister purge control valve circuit fault
P1775 is oxygen senson open circuit. Craig
Idle speed control valve coil 1 fault. Off voltage not less than 0.85 volts or on voltage not exceeding 12.25 volts.
Trouble code P1621 means: Engine control module engine immobilization input circuit malfunction
{| |- | Idle air control valve. Looks for stepper wildly out with hot or cold(<30degC) engine. Probably a sticky stepper motor, but cleaning mmay help. Chris, www.kwecars.com |}