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Old 07-24-2012, 07:01 PM   #1 (permalink)
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Default jd 9600 won't start error 71E

john deere 9600 combine won't start at the beginning of the season. Fuel generally leaks down over the winter, but we've not been able to get it run this summer.

It will almost run if the key is held in "Start" position, smokes black and “pops” – some pretty hard ignitions, but as soon as returned to the "run" position it dies. We've bleed injector lines, used hand pump, changed both filters and the electric supply pump...etc. Runs on ether. Fuel valve shows "+" voltage in "start" and "run" positions actually jumped it to 12V with same results. Half a tank of fuel.

Only error code that comes up is 71E “DIAGNOSTIC CODES OUTPUT SIGNAL STUCK HIGH”
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Old 07-24-2012, 07:02 PM   #2 (permalink)
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just what does 71E “DIAGNOSTIC CODES OUTPUT SIGNAL STUCK HIGH” mean???
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Old 07-24-2012, 10:46 PM   #3 (permalink)
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The rail that lets fuel to the injectors is stuck. Might be open just enough to bleed lines but not enough to keep it running. Might be the coil on the end of the injection pump that moves the fuel rail.
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Old 07-24-2012, 10:56 PM   #4 (permalink)
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Solution Number: 5160
Solution Summary: HBI-HX-1895 SEP 22 1989 71E AND/OR 72E ERROR CODE BEING DISPLAYED ON DIGITAL TACHOMETER / 9500 AND 9600 MAXIMIZERS
Publication Date: Apr 5 2002
**Paper copies of solutions may not be the most current solutions**
COMPLAINT: ERROR CODE 71E IS BEING DISPLAYED ON DIGITAL TACHOMETER. PROBLEM: CTM 68 DIAGNOSTIC PROCEDURE LEADS TO A FAULTY ECU. THE PROBLEM IS A VOLTAGE BEING FED TO THE TACHOMETER THROUGH WIRE NO. 132 OR A DEFECTIVE TACHOMETER. SOLUTION: ADDITIONAL DIAGNOSIS SHOULD INCLUDE DISCONNECTING J1 CONNECTOR AT THE ECU AND TURNING ON THE KEY. ERROR CODE 72E SHOULD BE DISPLAYED. IF 71E IS STILL BEING DISPLAYED THE PROBLEM IS NOT IN THE ECU. PROBLEM IS A UNWANTED VOLTAGE BEING FED IN THROUGH WIRE 132. CHECK THIS WIRE FOR A SHORT BY EXTRACTING WIRE 132 AT THE CONNECTOR ON THE BACK OF THE TACH. IF TACH STILL HAS A 71E THEN REPLACE TACH. IF TACH HAS A 72E THEN TEST FOR A SHORT ON WIRE 132 TO PIN POINT WHAT HARNESS HAS THE SHORT. REFER TO TM-1402 SECTION 240 AND THE GROUP COVERING BOSCH OR NIPPONDENSO ENGINE CONTROL UNITS FOR WIRING DIAGRAMS. 9500SH, CTS, CTS II, 9510, 9510SH, 9610, 9500, 9600
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Old 07-24-2012, 11:03 PM   #5 (permalink)
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Thanks Tom. We got this information on newagtalk too and checked unplugged what we thought was J1...
ufduh. THANKS!

If the J1 is the 3 lead line just below the ECU, then the issue is the ECU, since unplugging the 3 wire connector brought up 72E.

So we have another 9600 combine 155 serial numbers earlier, still the same year, but a "corn" machine vs the "small grains" machine with the apparent bad ECU. Would we be alright swapping ECU's to confirm a bad ECU, or not? H09600X651460 vs H09600X651605 (bad ECU) both have BOSCH 0 281 001 058 RE 28320 ECU's.

THANKS again!!
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Old 07-24-2012, 11:49 PM   #6 (permalink)
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OK, we swapped ECU's and the combine started and ran about 100 yards, where we turned it off. When we turned the key back on and got a 72E. We were able to clear the 72E and then we restarted and ran for 30-60 seconds without throughing a code. Thoughts? THANKS!!
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Old 07-25-2012, 12:40 PM   #7 (permalink)
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Default ECU update

To the fellow who suggested unhooking and rehooking - did so, thanks. AND the sister ECU works, so it sure looks like ECU.

This AM we put old ECU back in and it immediately came up 71E. Tried to clear codes and briefly got "00", but then reverted to 71E. So looks like $1700 ECU and $600 new wire harness to go with it)) Sure hope that cures it

thanks, Chuck
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Old 07-25-2012, 04:10 PM   #8 (permalink)
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Wowza!!! $1700 for an ECU and $600 for a harness? I'm in the wrong occupation!

What I would do... [don't we hate it when someone says that? ] is:

If you've written off the old faulty ECU, I would open the cover of the ECU unit and check each circuit on the board, especially around where wire #132 enters the box. Check for cracked solder joints, or a bridged circuit where solder has jumped the tracks and is possibly causing voltage leak onto 132's circuit. Also look for obviously burned capacitors or resistors. It could also be a dirty circuit board that a blast of compressed air and a spray with contact cleaner could clean.

A $10 Home Hardware soldering iron, [they're GREAT!!!] and a good set of glasses or magnifying glass, or a jeweler's loup, and you can reflow the solder tracks and connections to components. The fine point on the Home Hardware soldering iron is ideal for melting and reflowing the solder. Check actual ECU chip pin connections for proper seating.

One worthy preliminary step might be to try the faulty ECU box in your second machine with known good harness and good ECU, with the objective of determining if your faulty ecu box OR the Harness shorting [wire #132] is the actual problem. It might just be the harness itself with a chaffed harness from rubbing friction somewhere. The voltage backfeeding into wire #132 may have burned a small capacitor or something in the ECU box and maybe easy to replace. The replacement uf value capacitor probably costs $1.25 or less at any electronic hobby shop or on-line at Digi-key. Digi-key has an account with Revenue Canada that allows them to collect GST or HST so there is no delay on cross border shipments. Next day shipping to Canada, as in you'll get the next day if anywhere near a metro area.

If the harness is at fault with a short somewhere, I'd strip the harness and look for the bad wire, paint with liquid latex, and tape up good after drying the latex. Harness loom outer cover available aftermarket cheap. Purdy, too!

$1700 for an ECU?...I'm still shaking my head!!! I bet they sealed the cover on the box with Phenolic resin or something. You may have to take a small cutting wheel on a dremel to cut the resin joint open. Manufacturer's don't like us prying eyes with soldering irons and electronic parts catalogues readily available.

Parts prices on some of these farming machines seem to mimic bushel prices on product. If the parts supplier sees high grain prices, the parts price inflation rises exponentially. Bastids!

Anyway, good luck and approach with determination and careful execution for a greater chance of success.

Should the problem be something simple inside the ECU box, and cheap, then while you're in there, buy an aftermarket or factory performance chip for it and wake it up a bit! A treat for your efforts!

Link to Digi-key: http://www.digikey.ca/?adpos=1t1&WT....AD3BcslsNBv9mN

Last edited by RVH Wet Coaster; 07-25-2012 at 04:37 PM.
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Old 07-25-2012, 09:06 PM   #9 (permalink)
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Quote:
Originally Posted by chuckmerja View Post
To the fellow who suggested unhooking and rehooking - did so, thanks. AND the sister ECU works, so it sure looks like ECU.

This AM we put old ECU back in and it immediately came up 71E. Tried to clear codes and briefly got "00", but then reverted to 71E. So looks like $1700 ECU and $600 new wire harness to go with it)) Sure hope that cures it

thanks, Chuck
That is great, nice to help somebody far away, you will have to have the dealer install the ECU program software for your SN combine, it will come with no software, can use a combine or tractor at there dealership or at your farm.
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Old 07-29-2012, 09:43 AM   #10 (permalink)
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Here's an update - THANKS to all who helped! Using info rec'd here and newagtalk.com, we ascertained that we had a bad ECU. Local dealer ordered one and tried to program it at dealership...spent a day and a half doing that and on tech support to JD. Finally decided to bring it out, place it on our machine and do the programming. That worked, and the machine finally made it to the field yesterday! Woohoo!!

Until now I hadn't thought of our machines as "old", but dealer and JD had trouble finding someone old enough to work on our machine...the senior tech who came out yesterday had a junior tech with him who was just out of diapers when this combine was new...hmmm. We pride ourselves in being able to fix virtually all that we run...but this was a major frustration and needed JD "special sauce" -

Thanks AGAIN for all the help!!
Chuck
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