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Author Topic:   Reading ECU Data - 2003 140HP Johnson
de posted 05-14-2009 09:37 AM ET (US)   Profile for de   Send Email to de  
I have a 2003 Johnson 140HP 4-stroke (J140PX4ST) engine (white Suzuki) that I bought used 4 years ago. The seller said it had ~40-50 hours on the engine. I'm doing a complete rewire job on my boat and will be installing a new hour meter. I would like to query the computer (Engine Control Unit) to get a readout of the current running hours. Is this something I can do myself? Is there a special cable that needs to be purchased? The service manual makes no mention at all about doing this.



jimh posted 05-14-2009 02:03 PM ET (US)     Profile for jimh  Send Email to jimh     
I don't know if the Suzuki motors sold under the Johnson brand have the type of data you're looking for in their stored memory. If they did, you'd need some special interface cable to connect to the ECU, and you'd need some special software to communicate over that cable, and you'd need the appropriate hardware (such as a computer or diagnostic device) to execute the software. Can you do all that yourself? Yes, if you have the cable, the software, and device needed. For a one-time use, it is probably easier to get a dealer to retrieve the data, if it is indeed available.
seahorse posted 05-14-2009 04:51 PM ET (US)     Profile for seahorse  Send Email to seahorse     

You would need the special Johnson-Suzuki software disk which is different than the Suzuki software plus the special interface cable. Both items run into the hundreds of dollars.

It would benefit you to talk to an authorized Johnson-Evinrude dealer to just print out an engine report for you. Most places only charge about 1/2 hour for the procedure.

de posted 05-15-2009 10:14 AM ET (US)     Profile for de  Send Email to de     
Thanks for the info. I'll seek out an authorized service shop.
jd550 posted 05-17-2009 10:17 PM ET (US)     Profile for jd550  Send Email to jd550     
I'm not sure if the only difference between a Suzuki DF140 and your OMC is paint. If that is indeed the only difference, the Suzuki tachs have a built-in hourmeter, which reads from the ECU. During key-on self-test, the tach displays the number of hours on the motor, then returns to 0 after about 5 seconds.

I picked one of these up for about $130. You get the added benefit of 4 warning lights too - oil pressure, overtemp, overrev and check-engine. The check-engine lamp will blink diagnostics that you can look up by flash pattern, in the event that a code is thrown

This would give you hours, as well as some other benefits. It is a solid quality device, with full backlighting.

seahorse posted 05-17-2009 10:27 PM ET (US)     Profile for seahorse  Send Email to seahorse     


The Johnson-Suzuki 4-stroke uses the traditional Johnson-Evinrude control cables and wiring harness (SystemCheck).

This is not the same as the Suzuki wiring harness and they do not have some of the same features that Suzuki USA uses in their engines.

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