2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 197Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 197

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THEORY OF OPERATION
Throttle Position Sensor (TPS)
Provides the ECM with throttle angle information which the ECM uses in determining optimal air-fuel ratio, fuel injection timing and fuel

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