POWER TRIM - DESIGN II
Page 5B-64 90-884294 OCTOBER 2001
Troubleshooting Digital Trim Sender
Trim sender requires a 5 vdc reference signal from ECU. With the ignition switch in the
RUN position and using an appropriate probe (paper clip, etc.) inserted in parallel at the
trim sender bullet connectors, this voltage can be checked as follows:
Voltmeter Sender Harness Voltage
RED BLUE
4 – 5 vdc
BLACK BLACK
NOTE: 5vdc reference voltage at the ECU can be monitored by the Digital Diagnostic Ter-
minal. Voltage should be 5 vdc
±
0.1 v. Any other voltage indicates a defective ECU. If ECU
reference voltage is correct, but voltage at trim sender is low or not existent, inspect send-
er wiring and connections.
Voltage at trim sender should rise and fall smoothly as outboard is raised or lowered. Volt-
age at the full UP position should be 4 vdc ±0.5v. Voltage at the full DOWN position should
be 1.5 vdc ± 0.5 v. With the ignition switch in the RUN position and using an appropriate
probe (paper clip, etc.) inserted in parallel at the trim sender bullet connectors, this voltage
can be checked as follows:
Voltmeter
Sender Harness FULL UP FULL DOWN
RED YELLOW
4 vdc ± 0.5v 1.5 vdc ± 0.5v
BLACK BLACK
If voltage is not as indicated or voltage rise and fall is erratic, trim sender is defective.
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