FUEL INJECTION
90-884294 Page 3B-35OCTOBER 2001
Results: As throttle is advanced and engine is under load (in gear), numerical value on DDT display should
increase. As throttle is retarded, numerical value should decrease indicating knock sensor/circuit is
functioning. If numerical value does not change as throttle setting and load on engine varies, knock
sensor or knock circuit in ECM is defective.
Throttle Position Sensor Test
59030
a
a-Throttle Position Sensor
Purpose: Determines whether Throttle Position Sensor is functioning properly through the use of the Digital
Diagnostic Terminal (DDT). The Throttle Position Sensor is not adjustable.
1. Place outboard in water, connect Digital Diagnostic Terminal (DDT) to engine.
NOTE: If throttle position sensor is not functioning, #4 LED indicator light on DDT will be
illuminated.
2. Start engine, allow to warm up. Using DATA MONITOR portion of DDT, access TPI
VOLTS.
Results: As throttle is advanced, numerical value on DDT display should increase. As throttle is retarded,
numerical value should decrease.
HEAT TEST
With engine at idle, heat the TPS (with a hot air gun) below the electrical connection until
warm to the touch. Watch for any one or a combination of the following symptoms:
• RPM change
• Check engine light illumination
• Momentary warning horn signal
• TPS voltage value change (1/2 volt) on DDT
NOTE: Excessive heat will damage TPS.
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