Map Sensor Test; Throttle Position Sensor (Tps) - Mercury 25 EFI Service Manual

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MAP Sensor Test

The testing of the MAP sensor when it is not mounted on the engine cannot be performed with accuracy. Use the CDS to check

the functioning of the MAP sensor.

NOTE: A defective (failed) or disconnected engine coolant temperature sensor or manifold absolute pressure sensor will

activate the warning horn and warning light.

The throttle position sensor (TPS) transmits throttle angle information to the ECM. The ECM uses this information to vary the

injector pulse width and ignition timing accordingly. The TPS is non‑serviceable. Replace the throttle body with the TPS if the

sensor is not within specifications.

90-8M0105568 eng MARCH 2016

ECM engine harness

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