RENR1241
8 Page
1996 Caterpillar
All Rights Reserved
Printed in U.S.A.©
For Use In Challenger 75D and 85D Ag Tractors
RENR1241
September 1996
3176C And 3196 Engines
For Caterpillar Built Machines
6AR1-787
7ZR1-545
S e n s o r a n d C o n n e c t o r L o c a t i o n s
Conn ec to r P2 4/ J2 4
PTO Speed
Atmospheric
Pressure Sensor
Injector
Engine Cylinder
Head Gnd Stud
ECM Connector
J2/P2
ECM Connector
J1/P1
Engine Speed/Timing
Sensor Connector
P9/J9
Electronic Control
Module (ECM)
Coolant Temperature
Sensor Connector
J10/P10
Coolant Temperature
Sensor
Engine
Speed/Timing
Sensor
Inlet Manifold
Air Temperature
Sensor
Turbocharger Compressor Outlet
Pressure Sensor
Filtered Fuel Pressure
Sensor
Connector J5/P5
D72552
Conventional
Nozzle
Fuel
Tank
Cam
ECM
Cooling
Filter
Fuel Supply
(In Head)
Relief
Valve
Fuel
Tank
Spill
Valve
Solenoid
Rocker Arm
Pump
Signals\
To Fuel
Injectors
(From
Fuel
Injection
Control)
6
5
4
3
2
1
Injection
Pressure
Curve
Injector
Spill Valve
Travel
Electrical Current
To Injector
Solenoid
Speed/Timing
Sensor
Speed/Timing
Wheel
Fuel
Injection
Control
Electronic
Governor
FRC
MAPS
Torque
MAPS
Speed/Timing
Signal Logic
Fuel Position
Frc
Fuel
Pos
Rated
Fuel
Pos
6
5
4
3
2
1
Signals
To Fuel
Injectors
Engine RPM
Coolant Temp
Coolant
Temp
Sensor
Cold
Mode
Engine
Control
Logic
Fuel Temp
Desired Rpm
Throttle Position
Sensor
Closed
Open
Speed/Timing
Wheel
Turbo Outlet
Pressure Sensor
Atmospheric
Pressure Sensor
EUI Electronic Systems
Electronic Governor
EUI Fuel System
Example Of System Action
RPM Control Logic
D74036
RENR1241
8 Page
D74285
P9
J3
C
B
A
J22
P17
7
9
11
1
12
2
3
10
D789-WH-16
D790-OR-16
D791-YL-16
D788-BK-16
D788-BK-16
A751-YL-16
4
D787-GN-16
C967-BU-16
D786-BR-16
995-BU-16
D786-BR-16
D786-BR-16
994-GY-16
5
A701-GY-16
A702-PU-16
A747-GY-16
A
B
CWH
BK
997-OR-16
993-BR-16
SIGNAL
VS
GROUND
OR
A751-YL-16
FUEL TEMP
SENSOR
INLET AIR
TEMP
SENSOR
2
FILTERED FUEL
PRESS
SENSOR
1
UNUSED
A703-BR-16
A704-GN-16
UNUSED
D811-YL-16
D810-PU-16
PTO SPEED +/TDC+
PTO SPEED -/TDC-
UNUSED
UNUSED
ANALOG SENSOR COM
ANALOG SENSOR +V
P5
A746-PK-16
999-WH-16
998-BR-16
996-GN-16
D788-BK-16
D788-BK-16
8
6
UNUSED
TO ENGINE
RETARDER
SOLENOIDS
A705-BU-16
A706-GY-16
A746-PK-16
996-GN-16
998-BR-16
999-WH-16
3
P23
J17
A
B
CGN
YL
997-OR-16
993-BR-16
OR
SIGNAL
GROUND
VS
VS
GROUND
OR
994-GY-16
SIGNAL
YL
GN C
B
P21
OR
GROUND
VS
SIGNAL
BK
WH
997-OR-16
993-BR-16
C
B
A
A
C967-BU-16
ATMOSPHERIC
PRESS SENSOR
P22
J2
P2
INJECTOR SOLENOIDS
A706-GY-16
D791-YL-16
A704-GN-16
D790-OR-16
A702-PU-16
D789-WH-16
A705-BU-16
A703-BR-16
A701-GY-16
RETARDER SOL MED/HI
RETARDER SOL LOW/HI
UNUSED
D788-BK-16
RETARDER SOL COMM
D787-GN-16
D786-BR-16
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
COOLANT TEMP
SENSOR
J24
P24
SPEED/TIMING
SENSOR
995-BU-16
29
1
30
36
2
14
8
20
23
37
38
35
33
32
31
26
25
24
21
16
15
10
40
11
39
4
9
7
19
13
6
5
12
18
17
22
28
27
J10
OR
GROUND
VS
J21
SIGNAL
993-BR-16
997-OR-16
993-BR-16
997-OR-16
BK
WH
A
B
C
C
B
A
WH
BK
SIGNAL
+VS
GROUND
J23
+V TIMING
SPEED/TIMING
TDC SERVICE
PROBE ACCESS
COOLANT TEMP
SPEED/TIMING COM
ATMOSPHERIC PRESS
FLTRD FUEL PRESS
34
CYL NO.6
CYL COMMON 5&6
CYL NO.4
FUEL TEMP
CYL COMMON 3&4
CYL NO.2
CYL COMMON 1&2
UNUSED
CYL NO.5
CYL NO.3
TURBO OUTLET PRESS
OR
GN
YL
SIGNAL
VS
GROUND
OR
TURBO OUTLET
PRESS SENSOR
UNUSED
CYL NO.1
D791-YL-16
D791-YL-16
D790-OR-16
D790-OR-16
A747-GY-16
D789-WH-16
P10
J9
P3
993-BR-16
INLET AIR TEMP
997-OR-16
D789-WH-16
J5
997-OR-16
993-BR-16
THIS SCHEMATIC IS FOR THE CH75/CH85 D-SERIES
UPDATE (138-7462 CHG 00).
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF
AND XMSN SHIFTER IN NEUTRAL.
UNLESS OTHERWISE SPECIFIED: ALL WIRE IS 18 GAUGE.
PTO SPEED
SENSOR
(OPTIONAL 85D ONLY)
WH
BK 2
1
D811-YL-16
D810-PU-16
D74284
LAMP FLASH SW
2
3
4
9
10
11
12
13
14
16
17
18
20
21
23
15
37
22
24
25
26
27
28
30
29
8
19
6
32
33
34
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
35
UNUSED
UNUSED
UNUSED
NR/F SW (N.C.)
5
36
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
38
39
UNUSED
G788-YL
G787-GN
L996-WH
710-GN
G737-WH
NR/F SW (N.O.)
XMSN OUTPUT SPD
UNUSED
123-WH-14
SPEEDOMETER
UNUSED
123-WH-14
A430-OR
C912-GN
C980-YL
ECAP
ENGINE DATA
LINE
J8
P8
J1
P1
XMSN OUTPUT SPD
UNUSED
UNUSED
UNUSED
40
1
UNUSED
UNUSED
L997-BU
B793-YL
B792-BU
229-BK
UNUSED
UNUSED
A
C
B
D
ATA DATA LINK+
31
ATA DATA LINK-
+ BATTERY
- BATTERY
UNUSED
ECM GND STRAP
E
F
G
H
J
DIAGNOSTIC LAMP
THROTTLE INPUT
7
229-BK
UNUSED
DIGITAL SENSOR COM
710-GN
G737-WH
2
1
L997-BU
1
2
J30 P30
XMSN
SPEED
SENDER
710-GN
201-BK
BK
WH
NEUTRAL SW
NOTE A
2
3
G788-YL
1
G787-GN
L996-WH
GOV CONTROL
POSITION
SENSOR
SIGNAL
+V
GROUND
C
B 229-BK
C912-GN
123-WH-14
WH
BK
RD
A
123-WH
477-BK
449-WH
450-YL
710-GN
J34
P34
SIG
SW IN
+
477-BK
449-WH
SPEED/TACH
HOUR METER
6
4
3
1
5
2
201-BK
123-WH
614-PU
201-BK
710-GN
201-BK
-
PTO ATTACHMENT (CHALLENGER 85D ONLY)
C980-YL
229-BK
ENGINE DIAGNOSTIC
A430-OR
229-BK
ENG
CYL HEAD
DIAGNOSTIC LAMP
THIS SCHEMATIC IS FOR THE CH75/CH85 D-SERIES
UPDATE (138-7462 CHG 00).
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF
AND XMSN SHIFTER IN NEUTRAL.
UNLESS OTHER SPECIFIED: ALL WIRE IS 18 GAUGE.
NOTE A: PTO SENSOR AND NEUTRAL SWITCH ARE OPTIONAL ATTACHMENTS
FOR CHALLENGER 85D ONLY.
P11 J11
1
3
4
5
6
7
10
9
11
12
8
2
NOTE A
ABBREV COLOR
RD RED
WH WHITE
OR ORANGE
YL YELLOW
PK PINK
BK BLACK
GY GRAY
PU PURPLE
BR BROWN
GN GREEN
BU BLUE
COLOR ABBREVIATIONS
SYMBOL DESCRIPTION
BLADE, SPADE, RING OR SCREW
TERMINAL
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ELECTRICAL CONNECTION TO
MACHINE STRUCTURE
INTERNAL ELECTRICAL CONNECTION
TO SURFACE OF COMPONENT
CONNECTOR
ATCH WIRE, CABLE, COMPONENT
CIRCUIT CONNECTED
SPLICE
CIRCUIT GROUPING DESIGNATION
H#
