Wire Description Wire Number
Wire Color
Wire Number
Description
Wire Color
CID
Component
0070 0168 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1228
Parking Brake Limit Switch Electrical System Voltage No. 1 Auxiliary Modulating Valve No. 2 Auxiliary Modulating Valve No. 1 High Flow Solenoid Valve No. 2 High Flow Solenoid Valve Auxiliary Solenoid Valve High Flow Solenoid Valve High Flow Switch Continuous Flow Switch Interlock Override Switch Auxiliary Switch Armrest/Seat Switch Attachment Lockout Switch
101
RD
Bat (+)
102
BU
Lighting Circuit
105
BR
109 110
C576
BU
Stop Lamp Relay
Key SW
603
PK
Beacon
OR
Alt Output (+) Term
604
OR
Stop Lamp
GN
Charger Pressure SW
605
YL
Turn Lamp Left
112
PU
Main Power Relay Output
606
GY
Turn Lamp Right
114
GN
Warning Horn (Forward)
608
GN
Flood Lamp Rear
118
GY
Wiper Power
610
OR
Flood Lamp Front
120
YL
Backup Alarm Power
614
PU
Dash Lamps
122
BU
Hour Meter Power
617
BR
Tail / Marker Left
123
WH
Fuel Level Gauge Power
618
YL
Tail / Marker Right
124
GN
Heater Power
619
GN
Roading Lamp Low
126
PK
Interlock Control Power
674
BU
Parking Brake Lamp Relay Coil
127
OR
Cold Start SW / Hyd Filter Lamp Relay Power
676
PU
Armrest Lamp Relay Coil
781
PK
C1 Relay Coil
782
GY
C2 Relay Coil
A751
YL
Tool SW Power
Lighting Circuits
128
PK
Aux Hyd Control Power
144
GN
Beacon SW / Rear Working Lamp SW Power
197
GN
4th Function Power
¹ The CID is a diagnostic code that indicates which component is faulty. 200
BK
Main Chassis
A752
BR
Tool Power
201
BK
Operator Interlock Control (-)
F780
PK
Parking Brake SW
202
BK
Relay Return
877
YL
Cold Start Relay Output
203
BK
Frame Ground
944
OR
Data Link (+)
945
BR
Data Link (-)
Basic Machine Circuits
Failure Mode Identifiers (FMI)¹ FMI No.
Failure Description
0
Data valid but above normal operational range
1
Data valid but below normal operational range
304
WH
Starter Relay Output
975
WH
Implement Detent Sol
306
GN
Starter Relay Coil
A958
WH
Parking Brake Sol
307
OR
Key SW To Interlock Control
E917
WH
Implement Lock Out SW
308
YL
Main Power Relay Coil
F905
YL
Auto Leveler Sol
321
BR
Backup Alarm / Backup Pressure SW
G982
PK
Interlock Override SW
322
GY
Warning Horn SW
G983
GN
Armrest SW N/O
327
PK
Fuel Shutdown Sol
G984
PK
Armrest SW N/C
A309
GY
Fuel Enable
G985
PU
Seat Switch
L987
WH
Start Aid SW
L998
OR
A Sol Source
Monitoring Circuits
2
Data erratic, intermittent, or incorrect
3
Voltage above normal or shorted high
403
4
Voltage below normal or shorted low
404
YL
Hyd Oil Temp SW
L999
GN
Hi Flow Sol Source
5
Current below normal or open circuit
405
GY
Engine Oil SW
M901
YL
Interlock Override Lamp
6
Current above normal or grounded circuit
7
Mechanical system not responding properly
406
PU
Coolant Temp SW
M903
GN
Not Used
8
Abnormal frequency, pulse width, or period
436
OR
Hyd Filter Lamp
M906
BU
C1 Relay Output
GN
Alternator (R) Term
9
Abnormal update
439
YL
Armrest Lamp
M907
GY
C2 Relay Output
10
Abnormal rate of change
442
GY
Hyd Filter Bypass SW
P978
GN
A1 Sol
11
Failure mode not identifiable
12
Bad device or component
13
Out of calibration
14
Parameter failures
15 16 17
Module not responding
447
PK
Fuel Level Sender
P979
YL
A2 Sol
C444
YL
Alternator Indicator Lamp
P980
OR
H1 Sol
C457
BU
Stop Pressure SW1 And SW2
P981
PU
H2 Sol
Parameter failures
H416
GN
Transmission Sol
P982
BU
Proportional SW
Parameter not available
H417
OR
Parking Brake
P983
GN
Control SW H1
P984
YL
Control SW H2
P988
OR
Implement Pilot Sol
18
Sensor supply fault
19
Condition not met
20
Parameter failures
Accessory Circuits 500
¹The FMI is a diagnostic code that indicates what type of failure has occurred.
BR
T
Pressure Symbol
Temperature Symbol
Wiper - Front (Park)
501
GN
Wiper - Front (Low)
P993
OR
Continuous Flow SW
506
PU
Washer - Front
P994
BU
A2 Switch
536
WH
Hazard / Turn SW
P996
GN
Proportional Signal
537
GN
Turn Signal SW / Flasher
P997
BR
Proportional Sensor Return
Level Symbol
Circuit Breaker Symbol
Flow Symbol
Symbols and Definitions 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.
Control Circuits
Ground Circuits
² The MID is a diagnostic code that indicates which electronic control module diagnosed the fault.
Symbols
Accessory Circuits (Continued)
Power Circuits
Component Identifiers (CID¹) Module Identifier (MID²) Auxiliary Hydraulic Control (MID No. 106)
Harness And Wire Electrical Schematic Symbols
RENR2863-03 December 2008
Description
Ground (Wired): This indicates that the component is connected to a grounded wire. The grounded wire is fastened to the machine. Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine. 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.
216, 226, 228, 236, 246, and 248 Skid-Steer Loader Electrical System 216: 4NZ1-2499
226: 5FZ1-5199
228: 6BZ1-699
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. 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.
236: 4YZ1-3999
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.
246: 5SZ1-3999
248: 6LZ1-999
Harness and Wire Symbols 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.
1 2
Harness Identification Letter(s): (A, B, C, ..., AA, AB, AC, ...)
Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Letters and Harness Connector Serialization Codes
C-C4 130-6795
Part Number for Connector Plug
AG-C3 130-6795
Harness Connector Serialization Code: The "C" stands for "Connector" and the number indicates which connector in the harness. (C1, C2, C3, .....)
L-C12 3E-5179
AG-C4 111-7898
1
325-AG135 PK-14 Pin
Socket
Part Number For Connector Recepticle
5A
Receptacle Pin or Socket Number
Single Wire Connector
9X-1123
Fuse (5 Amps)
Component Part Number
Plug
2
Harness identification code: This example indicates wire 135 in harness "AG".
Ground Connection
200-L32 BK-14 Circuit Identification Number
Wire Color
Wire Gauge
Printed in U.S.A.
© 2008 Caterpillar All Rights Reserved
Component Location
16 10 1
31
12
8
Schematic Location A-7
30
CONN 2
B-7
1
D-7
1
CONN 4
E-7
31
CONN 5
E-6
10
CONN 6
A-6
3
CONN 7
Datalink
14
23 18
4
Machine Location
CONN 1 CONN 3
11 32
9
Connector Location Connector Number
19
A-6
20 34 5
27
24
21
7
6
28
29
13
3
26 25
30
2
17
15
33
22
3
Machine Location 1
B-7
5
Arc Suppressor
A-4
20
Relay - C1
A-5
1
Relay - C2
A-4
1
Battery
A-7
2
Relay - Cold Start
C-7
1
Beacon
D-4
34
Relay - Hyd Filter Lamp
A-5
1
Breaker - Lighting
C-7
1
Relay - Main Power
C-7
1
Breaker - Main
B-6
1
Relay - Parking Brake Lamp
A-5
1
Relay - Armrest Lamp
Control - Aux Hyd Hardware
C-2
28
Relay - Start
B-7
1
Control - Operator Interlock
C-5
20
Relay - Stop Lamp
A-6
1
Filter - Hour Meter
E-3
23
Resistor
C-2
28
Flasher
C-7
1
Sender - Fuel Level
E-6
12
Fuses - 10A, 15A, 20A
B-5
21
Solenoid - Auto Leveler
B-6
8
Gauge - Fuel Level
A-3
22
Solenoid - A1
D-6
14
Glow Plugs
C-7
9
Solenoid - A2
D-6
14
Ground - Cab
D-4
19
Solenoid - Fuel Shutdown
B-7
8
Ground - Engine
C-5
7
Solenoid - High Flow
D-6
14
Ground - Lower Frame
C-6
13
Solenoid - Implement Pilot
E-6
14
CONN 8
A-6
3
Ground - Lower Frame 2
D-6
13
Solenoid - Park Brake
E-6
14
CONN 9
B-6
13
Ground - Upper Frame
D-4
10
Solenoid - Pressure Rel
D-6
14
E-6
14
CONN 10
E-5
10
Ground - Upper Frame 2
D-6
10
Solenoid - Transmission
CONN 11
E-6
11
Handle - Horn LH
D-2
18
Starter
A-7
7
CONN 12
D-6
11
Handle - LH
D-2
10
Switch - Armrest
B-3
26
Handle - RH
B-2
17
Switch - Auto Leveler
D-3
23
Handle - RH Proportional
B-2
17
Switch - Backup Press
D-2
18
CONN 13
C-6
11
CONN 14
C-6
11
CONN 15
A-6
3
CONN 16
A-6
3
33 32
CONN 17
E-5
19
34
CONN 18
C-3
14
CONN 19
C-3
14
CONN 20
D-2
11
CONN 21
B-3
15
CONN 22
B-2
17
CONN 23
D-2
18
CONN 24
E-2
23
CONN 25
E-2
24
CONN 26 Tool E-1 16 The connectors shown in this chart are for harness to harness connectors. Connectors that join a harness to a component are generally located at or near the component. See the Component Location Chart.
22 23
19 26 31 20 21
30 1 8 5
16
25
9
17 18
6 29 3 7
11
24
27 15 14
4 10
12 2
28
Heater Unit
B-3
24
Switch - Beacon
A-3
22
Heater - Water Jacket
D-7
20
Switch - Charge Pressure
B-7
29
Horn - Front
E-5
4
Switch - Cold Start
D-2
23
Hour Meter
E-2
23
Switch - Continuous Flow
D-3
23
Function
90 °C MIN (194 °F)
Normally Open ¹
173-3837
Charger Pressure
1103 + 34.5 kPa 1103 - 69.0 kPa (160 + 5 psi) (160 - 10 psi)
827.5 kPa MIN (120 psi MIN)
Normally Open ¹
375.9 + 37.8 kPa 375.9 - 58.6 kPa (54.5 + 5.5 psi) (54.5 - 8.5 psi)
263 kPa MIN (38.1 psi MIN)
Normally Closed ¹
184-1564
Stop Pressure SW1 Stop Pressure SW2
192-0836
Backup Pressure
517.0 + 41.4 kPa 517.0 - 68.9 kPa (75.0 + 6.0 psi) (75.0 - 10.0 psi)
386.1 + 41.4 kPa 386.1 - 68.9 kPa (56.0 + 6.0 psi) (56.0 - 10.0 psi)
Normally Open ¹
7X-8549
Filter Bypass
110.3 to 137.9 kPa (16 to 20 psi)
86.2 to 103.4 kPa (12.5 to 15 psi)
Normally Open
¹ Contact position at the contacts of the harness connector.
Resistor, Sender and Solenoid Specifications Part No. 142-8824 (For 216, 226, 228)
B-7
5
152-1123
Switch - Engine Oil Pressure
B-7
4
Jumper - Rear RH
A-7
2
Switch - Filter Bypass
B-6
6
154-3988 (For 236, 246, 248)
Lamp - Dome
A-3
22
Switch - Front Working Lamp
A-2
22
A-3
22
Lamp - GP Fault
E-3
23
Switch - High Flow
E-2
23
Lamp - GP Function
B-3
22
Switch - Hyd Oil Temp
E-6
11
Lamp - LH Flood
E-2
23
Switch - Implement Lockout
A-3
22
Lamp - LH Head / Turn
D-1
23
Switch - Interlock Override
D-2
23
Lamp - LH Rear Flood
E-5
32
Switch - Key Start
D-3
23
Lamp - Rear LH
E-7
31
Switch - Parking Brake
D-2
23
Lamp - Rear RH
A-7
30
Switch - Rear Working Lamps
B-2
22
Lamp - Rear Stop / Tail / Turn LH
E-7
31
Switch - Roading Lamp
A-2
22
Lamp - Rear Stop / Tail / Turn RH
A-7
30
Switch - Seat
B-3
27
Lamp - RH Flood
B-2
22
Switch - Stop Press (SW1)
A-6
3
Lamp - RH Head / Turn
B-1
22
Switch - Stop Press (SW2)
A-6
3
Lamp - RH Rear Flood
A-5
33
Switch - Tool
D-3
23
Motor - Washer
E-1
24
Switch - Turn Signal
A-2
22
Motor - Wiper
E-1
24
Switch - Wiper / Washer
E-1
24
Power Junction
B-4
20
Valve - Implement Detent
B-2
17
B-7
1
Machine locations are repeated for components located close together.
Water Pump
E-6
5
Empty : 240 to 265 Full : 20 to 35
Solenoid - Valve Group Implement Detent
Switch - Coolant Temp
10
Resistance (Ohms)¹
Sender - Fuel Level Solenoid - High Flow Valve
23
Switch - Hazard
Component Description
144-1644
E-7
23
Contact Position
102 ± 3 °C (215.6 ± 37.4 °F)
E-3
E-3
Deactuate
Hydraulic Oil Temperature
Hour Meter Filter
Lamp - GP 2
Actuate
142-9804
Jumper - Rear LH
Relay - Fuel Shutdown
Machine Harness Connector And Components Locations
Off Machine Switch Specification Part No.
6.36 ± 0.4 9.4 Empty : 240 to 265 Full : 20 to 35
Sender - Fuel Level
159-0748
Solenoid - Implement Pilot Solenoid - Parking Brake Solenoid - Pressure Release Solenoid - Transmission
167-7801
Resistor
169-5778
Solenoid - A1 Solenoid - A2
10.5
390 ± 19.5 2.2 ± 0.2
¹ At room temperature unless otherwise noted.
Related Electrical Service Manuals Title
Form Number
Aux Hyd Control System
RENR2893
Operator Interlock Control System
RENR2864
(Dimensions: 34 inches x 24 inches)
Alternator
Alarm - Backup
Schematic Location A-5
Component
16 Page,
Machine Location 31
Component
RENR2863-03
Schematic Location E-7