The T-630 is equipped with a digital readout located in the “Gray Box” on the right side of the engine compartment. This diagnostic gauge gives hours, temperature, RPM, and a number of other items of regular information. In the event of a shut down or failure to start, service codes will be displayed. Before turning the key off, read the displays service codes which can be looked up in the John Deere manual received in the T-630 owner’s manual.
The “Gray Box” serves as the junction box between John Deere and the shut down devices external to the John Deere installed on the T-630 as well as the key on/off and engine start signal.
The battery lead to the ECU on the John Deere is fused. Fuses are located in the Deere wiring harness on the right side of the engine down in the engine compartment. Within the Gray Box, terminal B should have 12v power at all times. Check fuses if not.
The fault code received if a T-630 sensor shuts down the engine is: SPN 970 – FMI 31 – Auxiliary Engine Shutdown Switch Active. Three functions on the T-630 will give this code:
The E-Stop
Low Water (radiator) level sensor
Low Hydraulic level sensor
All other codes are originated from John Deere and your nearest John Dealer is the best resource for trouble shooting.
In the event of an ECU shut down, re-set the ECU by turning the key off for 20 seconds after recording fault codes or the engine will not re-start.
Frequently asked questions:
|
Symptom: |
Check: |
|
Diagnostic Gauge lights do not come on when switch is turned on |
Check in-line fuses in John Deere Wiring Harness. (right side of engine, low in compartment) |
|
No power on terminal B of Gray Box |
Check in-line fuses in John Deere Wiring Harness. (right side of engine, low in compartment) |
|
Engine Diagnostic lights, but engine does not even try to start (starter does not engage at all) |
|
|
Engine starts and runs for about 30 seconds, but then quits. |
|
|
Engine tries to shut down when turning left |
Water low in radiator or overflow bottle is empty. Must be water in overflow bottle. |
|
Engine tries to shut down going straight over bumpy surface |
Probably low Hydraulic level. |
|
Engine starts and runs for 30 seconds with E-Stop in |
This is normal. |
Tuckerbilt T-630 Electronic Engine Controls wiring: Gray junction box to John Deere Harness.
|
23 Pin Connector (lower of the 2 connectors from the Gray Box to JD harness) |
|||||
|
Pin |
Circuit No. |
Color |
Wire Gauge |
Description |
Comments |
|
A |
n/a |
|
|
Not used |
|
|
B |
n/a |
|
|
Not used |
|
|
C |
n/a |
|
|
Not used |
|
|
D |
n/a |
|
|
Not used |
|
|
E |
n/a |
|
|
Not used |
|
|
F |
n/a |
|
|
Not used |
|
|
G |
n/a |
|
|
Not used |
|
|
H |
n/a |
|
|
Not used |
|
|
J |
n/a |
|
|
Not used |
|
|
K |
941 |
Brown |
16 |
External shutdown input |
Input from T-630 Auxiliary functions to the John Deere ECU to shut down. 3 functions on the T-630 complete this circuit. Low Water Level – is water in the overflow bottle? This can be unplugged to test. Low Hydraulic Level – disconnect K or Q of the oil sensor leads on the bottom terminal strip to test. The E-Stop – disconnect either wire on the E-Stop Contact to test. All T-630 Auxiliary signals can be removed from the circuit temporarily for testing by disconnecting the 23 pin connector. (it is the lower of the two connectors) |
|
L |
n/a |
|
|
Not used |
|
|
M |
n/a |
|
|
Not used |
|
|
N |
n/a |
|
|
Not used |
|
|
O |
n/a |
|
|
Not used |
|
|
P |
n/a |
|
|
Not used |
|
|
Q |
012 |
Red |
16 |
Switched Power (12v) |
Only active when switch is on. Power connection for the External Shutdown (Pin K) circuits. |
|
R |
n/a |
|
|
Not used |
|
|
S |
n/a |
|
|
Not used |
|
|
T |
n/a |
|
|
Not used |
|
|
U |
n/a |
|
|
Not used |
|
|
V |
n/a |
|
|
Not used |
|
|
W |
n/a |
|
|
Not used |
|
|
X |
050 |
Black |
16 |
System Ground |
General system ground. Not for sensor return. |
|
21 Pin Connector (upper of the 2 connectors from the Gray Box to JD harness) |
|||||||
|
Pin |
Circuit No. |
Color |
Wire Gauge |
Description |
Comments |
||
|
Std. |
Ext. |
||||||
|
A |
n/a |
|
|
Not used |
|
||
|
B |
022 |
032 |
Red |
12 |
Fused Un-switched Battery Power |
To “B” terminal of gray box. In-Line Fuse in JD harness hanging low. |
|
|
C |
n/a |
|
|
Not used |
|
||
|
D |
422 |
422 |
Red |
12 |
Starter Relay |
To “Start Button”. When start button pushed, 12v must flow through terminal 4, through Neutral Start on Pump to Terminal D into ECU harness. |
|
|
E |
050 |
050 |
Black |
18 |
Ground |
Grounded on the engine side of the battery. |
|
|
F |
020 |
020 |
Black |
18 |
CAN Shield |
To any CAN connectors including the diagnostic gauge. |
|
|
G |
012 |
012 |
Red |
12 |
Battery Power to ECU (Switched) |
Wired to the “Ignition” terminal of the Key Switch. |
|
|
H |
n/a |
|
|
Not used |
|
||
|
J |
412 |
412 |
Red |
18 |
Alternator ignition |
Under terminal “G” (Switched Power) |
|
|
K |
n/a |
|
|
Not used |
|
||
|
L |
n/a |
|
|
Not used |
|
||
|
M |
n/a |
|
|
Not used |
|
||
|
N |
n/a |
|
|
Not used |
|
||
|
O |
n/a |
|
|
Not used |
|
||
|
P |
n/a |
|
|
Not used |
|
||
|
R |
947 |
947 |
Violet |
18 |
Throttle Switch |
Throttle common |
|
|
S |
914 |
914 |
Yellow |
18 |
Sensor Return |
Throttle Sensor Return |
|
|
T |
Plug |
936 |
Blue |
18 |
Bump Speed Down |
Not currently used |
|
|
U |
905 |
905 |
Green |
18 |
CAN Low |
Diagnostic Gauge |
|
|
V |
904 |
904 |
Yellow |
18 |
CAN High |
Diagnostic Gauge |
|
|
W |
Plug |
955 |
Green |
18 |
Bump Speed Up |
Not currently used |
|
|
X |
Plug |
923 |
Orange |
18 |
Bump Enable |
Not currently used |
|
Tier II Wiring Diagram Starting T-630 Serial 04272
SPN/FMI code listing available on FW Murphy website at: http://www.fwmurphy.com/pdf/0710170.pdf
Last updated: June 07, 2008
Email Tucker Sales
Organization Name
P.O. Box 492810
Leesburg, FL 34749
Shipping:
Phone: (352) 787-3157
Fax: (352) 365-1732
Copyright © 2008
Organization Name All rights
reserved.