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Author Topic:   Analog Trim Gauge Calibration on E-TEC 90
edvb posted 12-17-2006 01:02 AM ET (US)   Profile for edvb   Send Email to edvb  
I have a 2007 E-TEC 90-HP and installed an analog trim gauge. With the rod in the third hole per instructions from manual, I tried to adjust the sensor to get the gauge pointer to read in the center of the scale. I have a hard time getting the gauge pointer to the center of the gauge. I was able to set [the sensor] so [the gauge] shows that [the gauge pointer] is on the bottom line when [the engine] is trimmed all the way down.

When I trim up [the gauge pointer] will go to the center. At low [engine speed] if I trim higher the gauge pointer will only go about 3/4-scale and stop. I can trim [the engine] higher but the gauge pointer will not go to full-scale.

I was able to have the mechanic hook up his laptop to a another boat he had in his shop, and he let me play with the program. I do electronics for a living, so it only took a few minutes to see how the program was laid out. After connecting and going in motor setup there was a tab to set the high and low trim points and also the tilt point.

Does this [?] just let you set how far the motor tucks in and how far the motor can trim out once you reach a certain RPM with the trim switch? This [?] would make sense as you would be able to set the full trim up angle to match the particular propeller for WOT speed without blowing out the prop.

Does this have anything to do with the analog trim gauge? I did not think so as why would you have a adjustment on the sensor if it can be done on the laptop.

The wiring drawing shows the white/tan sender wire going directly from the sender to the gauge. What is the resistance range on the sensor from full up to full down?

Is this [?] normal for this gauge? Both motor and OEM gauge are brand new and the gauge is the correct BRP part for this motor.

Any help on this sure would help me out. Thanks.

jimh posted 12-17-2006 12:55 PM ET (US)     Profile for jimh  Send Email to jimh     
If by "analog trim gauge" you mean you have a conventional trim gauge which consists of a milliammeter connected to a variable resistor and supplied with unregulated current from the boat's battery, I cannot imagine how any manipulation of the software contained in the Engine Control Module could affect the reading you see on such a gauge.

The general technique for calibration of such an analogue gauge is to physically manipulate the position of the sender and how it interacts with the actuating tab on the engine tilt mount so as to produce a range of meter readings most useful for your installation.

ratherwhalering posted 12-17-2006 01:15 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
Perhaps you are putting the horse before the cart? Try tilting the motor up and checking the function of the tilt sensor by manually manipulating the arm of the sensor mechanism.

jimh posted 12-17-2006 02:17 PM ET (US)     Profile for jimh  Send Email to jimh     
Usually there are instructions in the service manual or possibly in the owner's manual for the recommended procedure for calibration of the trim sensor position on the engine tilt mechanism.

Advice to verify the mechanical operation of the system is good advice. In an earlier discussion many electrical remedies were offered, but the real source of the problem was entirely mechanical: the sender arm was mechanically stuck in position.

Another prior discussion has more information on the mechanical aspect of calibrating the gauge, as well as some of the electrical influences.

edvb posted 12-17-2006 03:32 PM ET (US)     Profile for edvb  Send Email to edvb     
I took the sensor off and moved it stop to stop and I still have the same reading.

Has anyone seen a Etec with the trim gauge installed and checked the movement of the dial with the motor trimmed all the way down and all the way up?

No one around here has so I do not know if this is normal or not.

edvb posted 12-17-2006 04:15 PM ET (US)     Profile for edvb  Send Email to edvb     
Ok I checked it to ground. I have 15-ohm with the motor trimmed all the way up and no pressure on the sensor.

I have 48-ohm with the drive all the way down.

Shorting the the white/tan to black on the gauge shows full deflection.

I need to remove the sender and check the resistance but how far on the harness and what location are the connectors?

ratherwhalering posted 12-17-2006 04:50 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
The trim sender Deutsch connector in located inside the cowling, on the port side of the engine block. It is integrated into the main wiring harness, and if I remember correctly, it's a triangular, three wire connector. My 2004 E-TEC 90 uses a OMC Tech series analog trim gauge, and has full range at any speed, even at dockside with the engine off (but the key in the on position.)

If the sender is mechanically and electrically functional, I would next check the function of the gauge itself. I have ruined my share of gauges by wiring them incorrectly, but this is impossible with the E-TEC Deutsch connector system. I still suspect that the gauge is the culprit. Do you have access to another "system matched" trim gauge? Are you currently using an OMC/BRP gauge?

P.S. Cart before the horse ;-)

edvb posted 12-17-2006 06:18 PM ET (US)     Profile for edvb  Send Email to edvb     
Well having 15-ohm resistance instead of 0-ohm is what is making the difference. At 0-ohm when I short across the terminals at the gauge it shows full reading. I will call tomorrow and see what the resistance is suppose to be on a new gauge. If it is 0- to 48-ohm then that is my problem. Will let everyone know. Thanks a bunch guys for getting me on track.

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