JD X320 electronic control module

[bluemower]

are there any experts on the electronic control modules used on green tractors such as the JD X320? This apparently completes electrical circuits by controlling the ground. Examples include (1) inserting a relay in the starter circuit and (2) routing the engine magneto ground to the electronic control module instead of typical ground spade on the ignition switch.

What is the real purpose of this device?

[bgsengine]

What is the real purpose of this device?

making sure that owners take their tractors to the dealership that has the information and trained techs to do the diagnostics.

[RoyM]

[KE4AVB]

Not always grounding circuits as I found out on the Z830A and some of the circuits are bypassable too. On the Z830A I recently repaired the fuel solenoid was losing it positive voltage from the controller so I bypass the module for it to work as intended without the controller doing it.

The service is available for a reasonable outside the JD network. I probably download myself a copy soon when one my customers bring their X300 as the manual covers X300 X304 X320 X324 X340 X360.

[hanz63]

In short, if you work on enough of these- your life is made easier having one in stock. You replace less than before as the later ones fail at a lesser rate. The life of these modules are greatly affected by loose battery cables, careless jump starting etc. as they like nice steady current. More commonly the condition is a crank no start. I had an early one that somehow wanted to run the deck yet grounded the coil at the same time.
Group 20
Theory of Operation (SN -040000)
Power Circuit Operation
Function:
To provide unswitched and switched power to the primary
electrical components whenever the battery is properly
connected. The power circuits are divided among the
unswitched power circuit, switched power circuits (key
switch in on position), and secondary power circuits.
The secondary power circuit is energized when switched
power is supplied to the Al interlock module providing
current to the secondary circuit. The secondary power
circuit will not be energized if the Al interlock module fails.
Operating Conditions, Unswitched Circuits:
Voltage must be present at the following components with
the key switch in the off position.
• Gl battery positive terminal
• Ml starting motor - B terminal
• NI voltage regulator/rectifier - Blk wire
• FI and F2 fuses
• S4 key switch - B terminal
• Xl power port switch
The positive battery cable connects the battery to the
starting motor. The starting motor bolt is used as the 12
volt DC tie point for the rest of the electrical system. The
51 and 52 Red wires supply voltage the Fl and F2 fuses.
The Fl fuse protect the circuit to the key switch while the
F2 fuse protect the power port circuit. The battery cables
and the starting motor tie point connections must be
good for the machine's electrical system to work properly.
Proper starting motor operation depends on the battery
cables to carry high current. The ground cable connection
is equally as important as the positive cable connection in
maintaining electrical system integrity.
Operating Conditions, Switched Circuits:
With the key switch in on position, PTO/RIP switch off,
brake unlocked, transmission in neutral, and operator
TM2308 (08JAN14)
40-20-1
off the seat, switched voltage should be present at the
following components:
• Sl key switch - terminal "L"
• F3 and F4 fuses
• S5 light switch - 72B Red/Wht wire
• Sl brake switch - 71G Red/Wht wire
• S2 reverse switch - 71 H Red/Wht wire
• S3 seat switch - 71J Red/Wht wire
• Al interlock module - terminal E, 71G Red/Wht wire
• Al interlock module - terminal D, 204B Tan wire
• S6 PTO/RIP switch - 71C and 71F Red/Wht wires
• PI hour meter, 7 IG Red/Wht wire
These circuits are controlled by the key switch and are
protected by the F3 and F4 fuses and the unswitched
circuits.
With power now available at various locations on the
machine, the electrical system is ready to perform the
different functions of starting and running the engine,
engine monitoring lights, the PTO clutch and the PTO
system interlocks, and the headlights.
The ground circuit is equally important as the power circuit
connections. Proper systems operation depends on good
wires and connections in order to carry the current needed
to operate the various components.
Operating Conditions, Secondary Switched Circuits:
Secondary switched voltage must be present at the
following components during the following conditions: Key
switch in on position, transmission in neutral, PTO/RIP in
off position, brake unlocked, and operator off seat:
• Yl fuel shutoff solenoid - 129A Grn and Grn/Wht wires
This circuit is controlled by the Al interlock module and
is protected by the Fl and F4 fuses.
KN52281 -19-31.JUL12-1/1
N=473

[Arkie]

What is the real purpose of this device?

[size=150]making sure that owners take their tractors to the dealership that has the information and trained techs to do the diagnostics.[/size]

+1

[Arkie]

What is the real purpose of this device?

[size=150]making sure that owners take their tractors to the dealership that has the information and trained techs to do the diagnostics.[/size]

+1