FUEL INJECTION
Page 3B-32 90-883728 JULY 2001
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Detonation Control System Test (200 Models Only)
a
a
58893
a-Knock Sensor
Purpose: Determines whether the detonation sensor and circuit located in the ECM is functioning.
1. Place outboard in water, connect Digital Diagnostic Terminal (DDT) to engine.
NOTE: If either knock sensor is not functioning, #4 LED indicator light on DDT will be illumi-
nated.
2. Start engine, allow to warm up. Using SPECIAL FUNCTIONS portion of DDT, access
KNOCK OUTPUT LOAD TEST.
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.
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