Service Manual 75-90 HP E-TEC Trim And Tilt [Electrical Circuit Tests]

Relay Testing

When the trim-UP button is pressed, the UP relay is energized and connects the blue trim motor wire to the battery positive (+) terminal. The green trim motor wire remains grounded. When the button is released, the blue trim motor wire returns to a grounded position.

When the trim-DOWN button is pressed, the DOWN relay is energized and connects the green trim motor wire to the battery positive (+) terminal. The blue motor wire remains grounded. When the button is released, the green trim motor wire returns to a grounded position.

Refer to TILT/TRIM RELAY TEST on p. 135 for relay testing procedure.

Trim and Tilt Motor Current Draw Tests

Careful analysis of the electric motor's current draw and trim/tilt unit operating speed aids evaluation of the electric motor and certain mechanical components.

Use a battery rated at 360 CCA (50 Ah) or higher that is in good condition and fully charged to per form this test.

IMPORTANT: Specifications are for static hydraulic tests. DO NOT attempt to perform the following tests while the boat is moving.

Connect a 0 to 100 A DC ammeter in series between the battery side of the starter solenoid and the red lead to the trim/tilt relay module.

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1. Red lead

Observe ammeter and a stopwatch while running hydraulic unit through several complete cycles.

Compare test results to the values listed:

Test results include three basic possibilities:

A. Low current draw – Check for:

• Valves leaking
• Relief valve springs weak
• Pump damaged
• O-rings leaking
• Check valves fouled or damaged
• Manual release valve damaged

B. High current draw – Check for:

• Pump binding
• Motor binding
• Cylinder binding
• Valves sticking

C. Normal current draw, slow operating speed – Check for:

• Impact valves damaged
• Check valve or shuttle valve malfunctioning
• Manual release valve damaged

Trim and Tilt Motor No Load Test

IMPORTANT: Securely fasten motor in a suit able fixture before proceeding with this test.

Use a battery rated at 360 CCA (50 Ah) or higher that is in good condition and fully charged to per form this test.

Connect a 0 to 50 A ammeter in series with the battery positive (+) terminal, ammeter red lead toward battery.

Attach or hold a vibration or mechanical tachometer to the motor while performing this test. Monitor motor RPM and current draw.

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The motor shaft must rotate clockwise, as viewed from the pump end, when positive (+) is applied to the blue lead, and negative (–) is connected to green lead.

The motor shaft must rotate counterclockwise, as viewed from the pump end, when positive (+) is applied to the green lead, and negative (–) is applied to the blue lead.

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If test results vary, replace the motor.

Trim Gauge Test

STEP 1

Turn key switch ON. Using a voltmeter, check for voltage between the trim gauge “I” and “G” terminals.

• If no voltage, check condition of instrument harness, key switch, and engine 20 A fuse.

• If voltage, go to STEP 2.

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STEP 2

Remove the white/tan lead from the trim gauge “S” terminal. With key switch ON, gauge should indicate full-trim DOWN position. Now connect a jumper wire between terminals “S” and “G.” Gauge should indicate full-trim UP position.

• If results are different, replace the trim gauge.

• If results agree, refer to Trim Sender Test on p. 292

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Trim Sender Test

IMPORTANT: To avoid immediate meter dam age, never apply a multimeter to an electrical circuit where voltage is present.

Disconnect the 3-pin Deutsch connector between the instrument harness and engine trim harness. Connect an ohmmeter between the white/tan wire, terminal “C,” of the engine harness and a clean engine ground.

With the outboard fully DOWN, meter must show a reading above 80 Ω.

With the outboard fully UP, meter must show a reading below 10 Ω.

• If results agree, refer to Trim Gauge Test on p. 291.

• If results are different, replace trim sender.

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Removal

Remove lower engine cover and disconnect the trim/tilt connectors.
Refer to LOWER COVER SERVICE on p. 82.

Remove the rubber grommet from the blue/green trim/tilt cable connector.

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Remove the terminals from the connector by using a suitable tool to depress the tab. While the tab is depressed, pull on the wire from the rear of the connector to release it from the connector.