90-823225--1 10965E-126 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
LACK OF POWER, SLUGGISH OR SPONGY
(continued)
CHECK SENSORS AND CONTROLS FOR:
1. Possible open in Engine Coolant Temperature (ECT) and Manifold Absolute Pressure (MAP)
sensors (Ground CKT 814). Also could have and set a DTC 14 and/or 33.
2. Throttle Position (TP) sensor circuit if DTC 21 set for open or grounds.
3. Using a scan tool and/or voltmeter record Throttle Position (TP) sensor voltage. It should read
less than .7 volt with throttle closed or at idle position. A sticky throttle shaft or binding linkage
causes a high voltage.
4. Power reduction mode activated.
5. Diagnostic test CKT 451 for being grounded, (maximum RPMs be will lower).
CHECK ENGINE FOR:
1. Restricted exhaust system.
2. Proper cylinder compression.
3. Proper valve timing and worn camshaft.
ADDITIONAL CHECKS:
1. Proper alternator output voltage.
2. Clean, tight and properly located ECM grounds.
3. Excessive resistance on bottom of boat (dirt, barnacles, etc.).
4. Proper size and pitch propeller for application.
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