INTAKE MANIFOLD PRESSURE SENSOR
INTAKE MANIFOLD TEMPERATURE SENSOR
UENR0630-00
APRIL 2013
GLOW PLUG CONNECTION
Harness And Wire Electrical Schematic Symbols
Symbols
ALTERNATOR
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Circuit Breaker
Symbol
Flow
Symbol
Symbols and Definitions
WASTE GATE REGULATOR
Fuse: A component in an electrical circuit that will open the circuit if too much current flows
through it.
Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The
circle indicates that the component has screw terminals and a wire can be disconnected from it.
Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.).
No circle indicates that the wire cannot be disconnected from the component.
Ground (Wired): This indicates that the component is connected to a grounded wire. The
grounded wire is fastened to the machine.
COOLANT TEMPERATURE SENSOR
Ground (Case): This indicates that the component does not have a wire connected to ground.
It is grounded by being fastened to the machine.
FUEL TEMPERATURE SENSOR
SECONDARY SPEED/TIMING
SENSOR
ELECTRONIC CONTROL MODULE
ECM
Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the
contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
C7.1 Industrial Engine
Electrical System
Sender: A component that is used with a temperature or pressure gauge. The sender
measures the temperature or pressure. Its resistance changes to give an indication to
the gauge of the temperature or pressure.
T
Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity.
It has a coil that makes an electromagnet when current flows through it. The
electromagnet can open or close the switch part of the relay.
G9R 1-UP
STARTER MOTOR
Solenoid: A solenoid is an electrical component that is activated by electricity. It has a
coil that makes an electromagnet when current flows through it. The electromagnet
can open or close a valve or move a piece of metal that can do work.
REFRIGERANT COMPRESSOR
Magnetic Latch Solenoid: A magnetic latch solenoid is an electrical component that is
activated by electricity and held latched by a permanent magnet. It has two coils (latch and unlatch)
that make electromagnet when current flows through them. It also has an internal switch that places
the latch coil circuit open at the time the coil latches.
Harness and Wire Symbols
Wire,
Cable,
or
Harness
Assembly Identification: Includes
Harness Identification Letters and
Harness Connector Serialization
Codes (see sample).
SOLENOID FOR HIGH
PRESSURE FUEL PUMP
STARTER SOLENOID
Harness Identification Letter(s):
(A, B, C, ..., AA, AB, AC, ...)
L-C12
3E-5179
AG-C4
111-7898
PRIMERY SPEED/TIMING SENSOR
L-C12
3E-5179
Harness Connector Serialization Code:
The "C" stands for "Connector" and the
number indicates which connector in the
harness (C1, C2, C3, ...).
1
Part Number: for Connector Plug
OIL PRESSURE SENSOR
LOCATED UNDER ECM
Part Number: for Connector Receptacle
2
Plug
Receptacle
Pin or Socket Number
1
2
Deutsch connector: Typical representation
of a Deutsch connector. The plug contains all
sockets and the receptacle contains all pins.
1
2
Sure-Seal connector: Typical representation
of a Sure-Seal connector. The plug and receptacle
contain both pins and sockets.
5A
9X-1123
Fuse (5 Amps)
Component
Part Number
325-AG135 PK-14
Harness identification code:
This example indicates wire group 325,
wire 135 in harness "AG".
Wire Gauge
Wire Color
Printed in U.S.A.
© 2013 Caterpillar
All Rights Reserved
P1
ELECTRONIC CONTROL MODULE
ECM
GLOW PLUG CONNECTION
HARNESS SIDE ON J2
1
INTAKE MANIFOLD TEMPERATURE SENSOR
25
40
64
SOLENOID FOR HIGH
PRESSURE FUEL PUMP
COOLANT SENSOR
WASTE GATE REGULATOR
OIL PRESSURE SENSOR
P2
INTAKE MANIFOLD TEMPERATURE SENSOR
ECM SIDE ON J2
25
1
RAIL PRESSURE SENSOR
STARTER MOTOR
STARTER SOLENOID
ALTERNATOR
REFRIGERANT COMPRESSOR
64
40
D
C
B
E
F
G
A
H
DIAGNOSTIC CONNECTOR
HARNESS WITHOUT DIAGNOSTIC CONNECTOR
SECONDARY SPEED/TIMING SENSOR
PRIMARY SPEED/TIMING SENSOR
J
8
7
6
5
4
ELECTRONIC CONTROL MODULE (ECM) J2
T962-H1 BK-16-GXL
T956-H2 BK-16-GXL
1
2
3
4
F
ENGINE INJECTOR 5 LS
ENGINE INJECTOR 4 LS
CRANK/CAM SPEED SENSOR SUPPLY
SMART WASTEGATE SOLENOID +
X931-E6 YL-18-GXL
X930-E7 GY-18-GXL
8
9
X929-E8 BU-18-GXL
10
11
12
13
14
966-E10 GN-18-GXL
18
19
CDL-
20
CDL+
21
22
23
24
25
26
27
28
E
ENGINE INJECTOR 3 LS
ENGINE INJECTOR 2 LS
ENGINE INJECTOR 1 LS
COOLANT TEMP/INTAKE AIR TEMP/AMBIENT TEMP RETURN
INTAKE AIR PRESSURE RETURN
OIL PRESSURE RETURN
FUEL RAIL PRESSURE RETURN
INTAKE AIR TEMPERATURE
COOLANT TEMPERATURE
DIAGNOSTIC CONNECTOR ONLY
INTAKE AIR PRESSURE +
OIL PRESSURE +
FUEL RAIL PRESSURE +
FUEL RAIL PRESSURE SIGNAL
CRANK/SPEED SIGNAL
CAM/SPEED SIGNAL
INTAKE AIR PRESSURE SIGNAL
OIL PRESSURE SIGNAL
ENGINE INJECTOR 1 HS
ENGINE INJECTOR 2 HS
ENGINE INJECTOR 3 HS
ENGINE INJECTOR 5 HS
ENGINE INJECTOR 4 HS
E-S1
E-S2
M795-E17 WH-18-GXL
29
30
31
32
33
34
35
36
37
38
L731-E66 BK-18-GXL
L731-E68 BK-18-GXL
X929-E8 BU-18-GXL
X923-E64 OR-18-GXL
X928-E33 GN-18-GXL
X922-E59 WH-18-GXL
F
X927-E34 YL-18-GXL
X921-E58 PK-18-GXL
X926-E35 GY-18-GXL
X920-E57 BR-18-GXL
T959-G3 BK-16-GXL
T953-G4 BK-16-GXL
INJECTOR 3
T958-F1 BK-16-GXL
T959-F1 BK-16-GXL
INJECTOR 2
2
3
4
1
2
3
4
1
2
3
4
T957-F3 BK-16-GXL
INJECTOR 1
T951-F4 BK-16-GXL
996-E69 GN-18-GXL
E965-E52 BU-18-GXL
X927-E34 YL-18-GXL
X928-E33 GN-18-GXL
X929-E8 BU-18-GXL
X930-E7 GY-18-GXL
X931-E6 YL-18-GXL
C967-E42 Bu-18-GXL
995-E43 BU-18
INJECTOR 4
E
X925-E62 PK-18-GXL
X926-E35 GY-18-GXL
N941-E38 BK-18-GXL
N941-E39 BK-18-GXL
N940-E40 BU-18-GXL
T960-G1 BK-16-GXL
T954-G2 BK-16-GXL
E-C14
P920-E53 BR-18-GXL
R746-E55 BU-18-GXL
X920-E57 BR-18-GXL
X921-E58 PK-18-GXL
X922-E59 WH-18-GXL
X923-E64 OR-18-GXL
X924-E63 BR-18-GXL
C246-E37 BK-18-GXL
1
E-C13
F712-E23 CN-18
L730-E47 BR-18-GXL
M795-E17 WH-18-GXL
N874-E22 BK-18
N940-E40 BU-18-GXL
N940-E46 OR-18-GXL
N941-E38 BK-18-GXL
N941-E39 BK-18-GXL
N941-E48 YL-18-GXL
X928-E33 GN-18-GXL
X927-E34 YL-18-GXL
X926-E35 GY-18-GXL
39
40
41
42
43
44
45
46
47
48
X931-E6 YL-18-GXL
X925-E62 PK-18-GXL
X930-E7 GY-18-GXL
X924-E63 BR-18-GXL
996-E70 GN-18-GXL
C967-E42 BU-18-GXL
E965-E52 BU-18-GXL
F711-E24 YL-18
101-E18 RD-18
C211-E19 BK-18-GXL
945-E20 BR-18
944-E21 OR-18
N874-E22 BK-18
F712-E23 CN-18
F711-E24 YL-18
Y950-E25 YL-18
Y951-E26 PU-18-GXL
1
CRANK SPEED SENSOR
2
996-E70GN-18-GXL
P920-E53 BR-18-GXL
Y946-E49 BU-18-GXL
1
CAM SPEED SENSOR
2
Y950-E25 YL-18
Y951-E26 PU-18-GXL
229-E4 BK-18
N940-E46 OR-18-GXL
L730-E47 BR-18-GXL
N941-E48 YL-18-GXL
49
50
Y946-E49 BU-18-GXL
M795-E17 WH-18-GXL
51
52
53
54
55
56
57
58
59
WASTEGATE
C211-E19 BK-18-GXL
E965-E52 BU-18-GXL
P920-E53 BR-18-GXL
D
R746-E55 BU-18-GXL
994-E56 GY-18-GXL
X920-E57 BR-18-GXL
X921-E58 PK-18-GXL
X922-E59 WH-18-GXL
60
61
ENGINE INJECTOR 6 HS
E-C12
996-E69 GN-18-GXL
1
INJECTOR 5
T955-H4 BK-16-GXL
101-E18 RD-18
229-E4 BK-18
944-E21 OR-18
945-E20 BR-18
966-E10 GN-18-GXL
994-E56 GY-18-GXL
995-E43 BU-18
C211-E19 BK-18-GXL
C246-E37 BK-18-GXL
15
16
17
DIAGNOSTIC CONNECTOR
DATA LINK
DATA LINK
PUMP SOLENOID
PUMP SOLENOID RETURN
D
6
7
2
INJECTOR 6
T961-H3 BK-16-GXL
5
ENGINE INJECTOR 6 LS
3
62
63
64
995-E43 BU-18
L731-E66 BK-18-GXL
1
SIGNAL
2
GROUND
C967-E42 BU-18-GXL
1
SIGNAL
L731-E68 BK-18-GXL
2
GROUND
COOLANT TEMP SENSOR
X925-E62 PK-18-GXL
X924-E63 BR-18-GXL
X923-E64 OR-18-GXL
INTAKE MANIFOLD AIR TEMPERATURE SENSOR
(+) BATTERY
(+) BATTERY SWITCHED
N940-E40 BU-18-GXL
Y946-E49 BU-18-GXL
N941-E48 YL-18-GXL
A
GROUND
B
SIGNAL
C
+5 VOLTS
STARTING CIRCUIT
FUEL RAIL PRESSURE SENSOR
(-) BATTERY / SENSOR RETURN
SENSOR / ACTUATOR SUPPLY
SIGNAL TO ECM
C
CONTROL (POSITIVE) FROM ECM
CONTROL (RETURN) FROM ECM
C
CAT DATA LINK
NOTE A
L730-E47 BR-18-GXL
N941-E39 BK-18-GXL
994-E56 GY-18-GXL
1
+5 VOLTS
2
GROUND
3
SIGNAL
N940-E46 OR-18-GXL
1
+5 VOLTS
N941-E38 BK-18-GXL
R746-E55 BU-18-GXL
2
GROUND
3
SIGNAL
KEYSWITCH
KEYSWITCH WITH
SOLENOID ACTIVE STARTER
Industrial Engine J1 Connections
KEYSWITCH
Y950-E25 YL-18
30
FUSE
M
B
FUEL PUMP SOLENOID
Y951-E26 PU-18-GXL
30
M
BATTERY
BATTERY
229-E4 BK-18
A
B
N874-E22 BK-18
C
101-E18 RD-18
31
31
944-E21 OR-18
D
945-E20 BR-18
F712-E23 CN-18
F711-E24 YL-18
E
F
G
SEE NOTE A
H
J
KEYSWITCH WITH IMS ACTIVE
STARTER SEPARATE GROUND
IMS
A
FUSE
1
2
3
BATTERY -
33
WATER IN FUEL RETURN
BATTERY BATTERY -
4
5
6
AUX TEMPERATURE 1
ATTAC TEMPERATURE
34
35
36
SENSOR 0 RETURN
SWG RETURN
INTERMEDIATE SPEED SWITCH
OVERSPEED VERIFY SWITCH
AIR FILTER RESTRICTION
7
8
9
10
RESERVED
BATTERY +
BATTERY +
BATTERY BATTERY -
11
12
FAN SPEED INPUT
13
FAN SPEED INPUT
14
15
RESERVED
BATTERY +
16
17
BATTERY +
-
18
19
20
CAN A+
21
22
23
24
25
26
ETHER DRIVE RETURN
HYDRAULIC FAN SOLENOID RESERVED
27
DIAGNOSTIC CONNECTOR
KEYSWITCH
HIGHWAYS
INTAKE MANIFOLD AIR PRESSURE SENSOR
50
FUSE
CATERPILLAR RECOMMEND THAT TWISTED PAIR CABLE AND
THE CABLE IS SHIELDED FOR ALL INDUSTRIAL APPLICATIONS.
OIL PRESSURE SENSOR
50e
KEYSWITCH WITH IMS ACTIVE
STARTER COMMON GROUND
J1939 DATA LINK
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
MODE SWITCH 1
IGNITION SWITCH INPUT
SENSOR 5V SUPPLY
SENSOR 5V SUPPLY
PWM THROTTLE SENSOR 8V SUPPLY AND WATER IN FUEL SENSOR POWER
THROTTLE 2 IVS OR WATER IN FUEL SENSOR
THROTTLE 1 IVS
MODE SWITCH 2
USER DEFINED SHUTDOWN OR PTO SPEED 1 AND 2 SELECTION
MPTS 1 OR PTO MODE DISENGAGE
MPTS 2 OR PTO RAISE/RESUME
52
CAN ACAN A SHIELD
53
THROTTLE 1 PWM INPUT
54
CDL+
CDL-
55
56
57
THROTTLE 1 ANALOGUE INPUT
THROTTLE 2 ANALOGUE INPUT
AMBIENT AIR TEMPERATURE
GLOW PLUG RELAY CONTROL
MAINTENANCE LAMP
WARNING LAMP
28
RESERVED
29
ETHER DRIVE
30
RESERVED
31
32
RESERVED
HYDRAULIC FAN SOLENOID +
DESCRIPTION
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ELECTRICAL CONNECTION TO
MACHINE STRUCTURE
INTERNAL ELECTRICAL CONNECTION
TO SURFACE OF COMPONENT
CONNECTOR
H#
CIRCUIT GROUPING DESIGNATION
ATCH WIRE, CABLE, COMPONENT
B
SPLICE
BLADE, SPADE, RING OR SCREW
TERMINAL
COOLANT LEVEL SWITCH OR THROTTLE ARBITRATION
MPTS 3 OR PTO SET/LOWER OR INTERMEDIATE SPEED
MPTS 4 OR PTO MODE ON/OFF
58
59
SYMBOL
60
61
SHUTDOWN LAMP
62
63
64
LOW OIL PRESSURE WARNING LAMP
WAIT TO START LAMP
FAN REVERSING SOLENOID CONTROL
PTO ENGAGED INDICATOR LAMP
ABBREV
COLOR
RD
WH
OR
YL
PK
BK
GY
PU
BR
GN
BU
RED
WHITE
ORANGE
YELLOW
PINK
BLACK
GRAY
PURPLE
BROWN
GREEN
BLUE
50e
30
M
A
BATTERY
31
THIS SCHEMATIC IS FOR THE C7.1 (G9R)
INDUSTRIAL ENGINE ELECTRICAL SYSTEM
MEDIA NUMBER: UENR0630-00
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
8
7
6
5
4
3
2
1