DiagElect246C.pdf

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INTERACTIVE SCHEMATIC

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Cover Page

Information

Schematic

Machine Views

Component Table

Tap Table

Fluid Power Symbols

Electrical Symbols

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Bookmarks X

EC-C3

EC-C2 E-C60

EC-C1

E-C61

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Electrical System

© 2012 Caterpillar, All Rights Reserved Printed in U.S.

Volume 2 of 2: Cab

Volume 1 of 2: Engine

246C, 256C, 262C, 262C2 and 272CSkid Steer Loaders277C, 277C2, 287C, 287C2 and 297CMulti-Terrain Loader 279C, 279C2, 289C, 289C2 and 299C

Compact Track Loader

UENR1753-0 August 20

246C:

JAY2116-UP

256C:

DWS1581-UP

262C:

MST3520-UP

272C:

RED2116-UP

277C:

JWF2336-UP

287C:

MAS1955-UP

297C:

GCP1657-UP

279C:

MBT1498-UP

289C:

JMP1344-UP

299C:

JSP1135-UP

262C2:

TMW1-UP

277C2:

MET1-UP

279C2:

KWB1-UP

287C2:

SSB1-UP

289C2:

RTD1-UP



Volume 1 of 2 - ENGINE

COMPONENT LOCATION

Component Schematic

Location

Machine

Location

12V Battery H-12 1

Alarm - Backup F-10 2

Alternator H-13 3

Relay - A/C Compressor H-1 4

Control - Product Link E-1 5

Fuse - Main Power I-8 6

Horn - Forward H-5 7

Indicator - Air Filter D-13 8

Motor - Condenser #1 H-1 5

Motor - Condenser #2 H-1 5

Motor - Fuel Priming Pump H-7 9

Motor - Starter H-12 10

Motor - Water Pump I-6 11

Plugs - Glow F-11 12

Radio - Product Link GPS E-3 5

Relay - Cold Start C-11 13

Relay - Condenser Fans G-1 14

Relay - Start G-12 15

Resistor - HVAC H-4 16

Sender - Fuel Level B-8 17

Sensor - Engine Coolant Temperature G-13 3

Sensor - Engine Speed C-11 18

Sensor - Hydraulic Temperature G-7 6

Sensor - Left Motor Speed G-11 19

Sensor - Right Motor Speed D-11 20

Sensor - Throttle Position H-5 21

Solenoid - 2 Speed E-11 22

Solenoid - A/C Compressor Clutch G-13 3

Solenoid - A1 G-5 21

Machine locations are repeated for components located close together.

Solenoid - Bucket (Lower) G-5 21

Solenoid - Bucket (Raise) G-5 21

Solenoid - Bucket (Tilt Down) F-5 21

Solenoid - Bucket (Tilt Up) F-5 21

Solenoid - Cold Start Advance C-13 23

Solenoid - Demand Fan B-7 24

Solenoid - Fuel Shutdown C-13 23

Solenoid - High Flow (C Minus) F-3 21

Solenoid - High Flow (C Plus) F-3 21

Solenoid - High Flow (LSR) F-3 21

Solenoid - Implement Shutoff G-5 21

Solenoid - LH Forward Pump F-11 25

Solenoid - LH Rev Pump F-11 26

Solenoid - Parking Brake E-11 27

Solenoid - Quick Coupler Valve E-5 17

Solenoid - RH Forward Pump F-11 28

Solenoid - RH Rev Pump F-11 27

Solenoid - Ride Control #1 B-5 21



Solenoid - Self Level D-5 21

Suppressor - Arc Solenoid Self Level D-5 21

Switch - A/C G-4 16

Switch - Engine Oil Pressure G-11 10

Switch - HVAC Blower G-2 16

Switch - HVAC High Pressure Cutout G-1 29

Switch - HVAC Low Pressure G-1 1

Switch - Hydraulic Filter Bypass F-10 8

Switch - Temperature Control H-4 16

Switch - Thermostat F-4 30

Component Schematic

Location

Machi

Locati

Solenoid - A2 G-5 21



Volume 2 of 2 - CAB

COMPONENT LOCATION

ComponentSchematic

Location

Machine

LocationComponent

Schematic

Location

Machi

Locat

Alarm - Action G-3 Resistor - 120 OHM C-2

Block - Fuse #1 H-9 Resistor - Accugrade D-1

Block - Fuse #2 G-9 Socket As - Beacon H-8

Control Gp - LH Joystick G-6 Switch As - Air Seat F-6

Control Gp - Machine I-14 Switch As - Auxiliary Bleed Off J-4

Control Gp - Monitor G-3 Switch As - Beacon D-4

Control Gp - MSS F-3 Switch As - Creeper Control E-4

Control Gp - RH Joystick E-6 Switch As - Front Work Lamps I-4

Flasher As - Stop Light D-9 Switch As - Hazard D-4

Fuse - Roading J-14 Switch As - Hydraulic Quick Coupler H-4

Ground - Cab J-14 Switch As - Implement Lockout B-6

Motor As - Front Wiper B-6 Switch As - Keystart F-3

Relay As - Cold Start E-10

Switch As - Limit Armbar G-8Receiver Gp - Laser C-3

Switch As - Operator Implement Lockout J-4Receptacle As - Power Supply F-3

Switch As - Parking Brake F-4

Relay As - Backup Alarm F-10 Switch As - Pattern Change G-4

Relay As - Fuel Pump F-10 Switch As - Rear Work Lamps I-4

Relay As - High Flow (C-Minus) G-10 Switch As - Ride Control E-4

Relay As - High Flow (C-Plus) H-10 Switch As - Roading Lamp D-4

Relay As - Level Ride F-10 Switch As - Seat F-6

Relay As - Stop Lamp G-10 Switch As - Self Level H-4

Relay As - Work Tool #1 H-10 Switch As - Turn Signal C-4

Relay As - Work Tool #2 H-10 Switch As - Wiper Washer B-6

Relay As - Work Tool Trigger G-10 Switch As - Work Tool #1 H-4

Relay Gp - Main Power #1 E-9 Switch As - Work Tool #2 H-4

Relay Gp - Main Power #2 E-9 Tank As - Window Washer C-7

Resister - Can J-14

Machine locations are repeated for components located close together.

A = Located inside cab.

B = Located inside right console.

C = Located inside left console.

35

A

A

36 37

37 C

B

B

39 C

B

A C

43

A C

A

44

CC

C

A C

A C

A B

A B

A 37

A C

A B

A 43

A C

A C

A 43

A

38

C

40

41

42

42

42

41



Volume 1 of 2- ENGINE

CONNECTOR LOCATION

Connector Number Schematic

Location

Machine

Location

CONN 1 E-11 6

CONN 2 E-7 6

CONN 3 C-7 31

CONN 4 B-13, D-11, G-11 20

CONN 5 C-10, G-8 11

CONN 6 B-9, D-9 32

CONN 7 C-9, G-9 32

CONN 8 I-7 11

CONN 9 I-5 11

CONN 10 C-5 21

CONN 11 E-5 17

CONN 12 F-5 6

CONN 13 H-4, I-4 29

CONN 14 D-3 5

CONN 15 D-2 5

CONN 16 E-2 5

CONN 17 G-3, I-3 30

CONN 18 H-3, J-3 16

CONN 19 Work Tool Connector J-6 33

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.



Volume 2 of 2 - CAB

CONNECTOR LOCATION

Connector Number Schematic

Location

Machine

Location

CONN 1 C-14 45

CONN 2 A-14 45

CONN 3 D-14 46

CONN 14 J-14 47

CONN 20 C-1, D-9 48

CONN 21 I-10 A

CONN 22 Service Tool Connector I-10 A

CONN 23 A-8 47

CONN 24 J-8 43

CONN 25 C-6 39

CONN 26 D-7 8

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.

CONN 13 D-9 48

CONN 27 G-2 44



CID / MID / FMI

Component Identifiers (CID¹)

Module Identifier (MID²)Machine Control System

(MID No. 039)CID Component

0041 8 Volt DC Supply

0070 Parking Brake Switch

0091 Throttle Position Sensor

0096 Fuel Level Sensor

0110 Engine Coolant Temperature

0190 Engine Speed Sensor

0262 5 Volt DC Sensor Power Supply

0354 Bucket Raise Solenoid

0355 Bucket Lower Solenoid

0357 Rackback Solenoid

0358 Implement Pilot Pressure Supply

0367 Ride Control Switch

0490 Implement Lockout Switch

0600 Hydraulic Oil Temperature Sensor

0681 Parking Brake Solenoid

1007 Linkage Control Joyst ick Mapping Switch

1182 High Flow Solenoid

1189 Auxiliary Hydraulics Lever

1190 Armrest/Seat Switch

1482 10 Volt DC Power Supply

1551 Engine Demand Fan System

1703 Left Drive Pump Forward Solenoid

1704 Left Drive Pump Reverse Solenoid

1705 Right Drive Pump Forward Solenoid

1706 Right Drive Pump Reverse Solenoid

1960 Ignition Key Reader

2211 Auxiliary Valve #1

2212 Auxiliary Valve #2

2471 Cab Door Position Switch

2474 Left Joystick Forward/Reverse Position Sensor

2475 Right Joystick Forward/Reverse Position Sensor

2476 Left Joyst ick Left/Right Position Sensor

2477 Right Joystick Left/Right Position Sensor 2669 Creeper Mode Switch

2685 Left Drive Motor Speed Sensor #1

2686 Left Drive Motor Speed Sensor #2

2687 Right Drive Motor Speed Sensor #1

2688 Right Drive Motor Speed Sensor #2

The CID is a diagnostic code that indicates which circuit is faulty.

The MID is a diagnostic code that indicates which electronic control module

diagnosed the fault.

Failure Mode Identifiers (FMI)¹FMI No. Failure Description

0 Data valid but above normal operat ional range.

1 Data valid but below normal operational range.

2 Data erratic, intermittent, or incorrect.

3 Voltage above normal or shorted high.

4 Voltage below normal or shorted low.

5 Current below normal or open circuit.

6 Current above normal or grounded circuit.

7 Mechanical system not responding properly.

8 Abnormal frequency, pulse width, or period.

9 Abnormal update.

10 Abnormal rate of change.

11 Failure mode not identifiable.

12 Bad device or component.

13 Out of calibration.

14 Parameter failures.


16 Parameter not available.

17 Module not responding.

18 Sensor supply fault.

19 Condition not met.


¹The FMI is a diagnostic code that indicates what type of failure has occurre



Volume 1 of 2- ENGINE

SPECIFICATIONS AND RELATED MANUALS

Off Machine Switch Specification

Part No. Function Actuate Deactuate Contact Positio

134-0404 Hydraulic Filter Bypass276 kPa

(40.0 psi)

207 kPa

(30.0 psi)

Normally Open

236-6923 A/C Pressure Cutout (High)275 kPa Max ¹

(40 psi)

170 ± 55 kPa

(24.6 ± 8 psi)Normally Open ²

149-6371 A/C Pressure (Low)103.4 ± 13.8 kPa

(15 ± 2 psi)

34.5 ± 7 kPa

(5 ± 1 psi)Normally Open

With increasing pressure the closed condition can be maintained up to 2800 kpa (405 psi), with decreasing pressure the closed condition can be maintain

own to 170 kpa (25psi).

Contact postion at the contacts of the harness connector.

143-0539

Related Electrical Service Manuals

Title Form Number

K3A Alternator: 239-0772 SENR5841

Electric Starting Motor: SENR3828

Machine Control System: KENR5119

Resistor, Sender and Solenoid SpecificationsPart No. Component Description Resistance (Ohms)¹

185-4254 Solenoid: Auxiliary #1, Auxiliary #2,

Bucket (Raise, Lower, Tilt Up, Tilt Down)2.2 ± 0.2

195-9700 Solenoid: C- & C+ (High Flow) 10 ± 0.5

252-4734 Solenoid: Implement Shutoff 7.5 ± 0.4 @ 20 ± 5°C (68°F ± 41°F)

274-8044 Solenoid: Quick Coupler Valve 10.3 ± 0.6 @ 25 ± 5°C (77°F ± 41°F)

277-8862 Solenoid: Demand Fan 5 @ 20°C (68°F)

285-2195 Solenoid: Ride Control #1 & Ride Control #2 5.9 ± 0.5 @ 25 ± 5°C (77°F ± 41°F)

¹ At room temperature unless otherwise noted.



Volume 2 of 2 - CAB

SPECIFICATIONS AND RELATED MANUALS

143-0539

Related Electrical Service Manuals

Title Form Number

K3A Alternator: 239-0772 SENR5841

Electric Starting Motor: SENR3828

Machine Control System: KENR5119



HARNESS and WIREElectrical Schematic Symbols

1

2

AG-C4

111-7898

L-C12

3E-5179

9X-1123Component

Part Number

Pin or Socket Number

Part Number: for

Connector Receptacle

Part Number: for

Connector Plug

Harness Identification Letter(s): (A, B, C, ..., AA, AB, AC, ...)

Plug

325-AG135 PK-14

Wire Co

Wire Ga

Receptacle

PressureSymbol

T

TemperatureSymbol

LevelSymbol

FlowSymbol

Circuit Breaker Symbol

Harness and Wire Symbols

1

1

2

2

Sure-Seal c onnector: Typical representationof a Sure-Seal connector. The plug and receptacle

contain both pins and sockets.

Deutsch connector: Typical representation

of a Deutsch connector. The plug contains allsockets and the receptacle contains all pins.

Symbols

Symbols and Definitions

Fuse (5 Amps)

5A

T

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 ha

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.

Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to th

machine.

Reed Switch : A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch;

opens the contacts of a normally closed reed switch.

Sender: A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. It

resistance changes to give an indication to the gauge of the temperature or pressure.

Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagne

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 curren

flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work.

Magnetic Latch Solenoid: A magnetic latch solenoid is an electrical component that is activated by electricity and held latched by

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 id entification code:

This example indicates wire group 325,

wire 135 in harness "AG".

L-C123E-5179

Wire, Cable, or Harness Assembly Identification:

Includes Harness Identification Letters and Harness

Connector Serialization Codes (see sample).Harness Connector Serialization Code: The "C" stands

"Connector" and the number indicates which connector in

harness (C1, C2, C3, ...).



MACHINE COMPONENT AND CONNECTOR LOCATIONS - ENGINE

33

33

32

32

31

31

30

30

29

24

24

24

21 20

20

19

19

17

17

16

16

14

14

11

11

9

9

8

8

7

7

7

6

6

5

5 4

4

3

3

2

2

1

1

VIEW ALL CALL



MACHINE COMPONENT AND CONNECTOR LOCATIONS - CAB

C

C

B

B

A

A

48

48

47

47

46

46

45

45

44

44

43

43

42

42

41

41

40

40

39

39

38

38

37

37

36

36

35

35

VIEW ALL CALL



ENGINE COMPONENT LOCATIONS

28

27

26

25

23

22

20

19

18

15

13

12

10

8

3

VIEW ALL CALLO

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