Cat 432E 434E 442E & 444E Backhoe Loader Electrical System Schematic Manual - PDF DOWNLOAD

Page 1

KENR8848 January 2010

Wire Description Wire Number

Description

Wire Color

Lighting Circuits Continued

101

RD

Bat (+) (Not Application Specific)

608

GN

102

RD

Head Lamp

610

OR

Head Lamp - Basic

103

RD

Power Batt (+) - Unswitched

611

PU

Head Lamp - High

104

YL

Auxilary Circuit

614

PU

Park/Tail/Dash/Lamp

105

RD

Key Switch

617

BR

Tail/Position Lamp - Left (Road Package)

106

WH

Auxilary Circuit

618

YL

Tail/Position Lamp - Right (Road Package)

111

YL

Rear Horn Relay

619

GN

Head Lamp - Low

620

WH

Flood Lamp - Front Fog Lamp

112

PU

PRM Module #1

115

RD

ACC Power Port

627

YL

116

BR

Rear Flood Lamp

630

GY

117

YL

Rear Flood Lamp (ATCH)

118

GY

Front Wiper

702

OR

AWD Switch to LH Brake Sw

119

PK

Rear Wiper

708

YL

XMSN Lock Switch

122

BU

Heater/AC Switch

720

PU

XMSN Brake Switch to AWD Relay

123

WH

Quick Coupler

751

GN

XMSN Speed Clutch Solenoid No. 1

124

GN

A/C Compressor

752

YL

XMSN Forward Low Solenoid

125

OR

Product Link

754

BU

XMSN Reverse Solenoid

126

PK

Laser Grade Check

762

YL

Bucket Positioner Solenoid Switch

133

OR

Advisory Display

766

GN

XMSN Disconnect Solenoid

136

GN

Differential Lock Relay

774

YL

Implement Disable Relay

143

BR

Ride Control Relay

779

WH

Coupler Engage Solenoid

144

GN

Beacon

C704

GY

Shuttle Forward Sw

146

GY

PRM Module #1

C707

PK

Shuttle Reverse Sw

157

YL

Front Flood Lamp (ATCH)

C720

BU

XMSN Lock Switch Parking Brake

158

BR

Front Flood Lamp

C743

PK

BU

Aux Ckt

E701

PK

Auto Ride Control Switch

161

RD

Aux Ckt

E727

BU

Diode - Parking Brake Relay

180

GN

Operator Seat

F711

GN

CAN Link + (J1939)

Ground Circuits

F712

GY

CAN Link - (J1939)

200

BK

Main Chassis

F738

WH

Active Ride Control Switch (N.C.)

202

BK

Ground Control

F739

GN

Active Ride Control Switch (N.O.)

207

BK

Starter Diagnostic

F748

WH

Ride Control Switch

218

BK

Start Relay

G703

GN

Load Check On

225

BK

Hydro Solenoid To Sensor

G760

WH

XMSN Speed Switch 2

265

BK

Electronic Pump Control

G761

YL

XMSN Speed Switch 3

A250

BK

MSS Indicator (Return)

G762

BR

XMSN Speed Switch 4

G763

PU

XMSN Neutral Switch

304

WH

Starter Relay No. 1 Output

G768

GN

XMSN Control Speed Switch 1

306

GN

Starter Relay Coil Or Key Switch

G795

OR

AWS Mode Switch To Rear Steer Switch

307

OR

Key Switch To VMIS Sensor Module

H705

BR

Pump Relay

308

BK

Main Power Relay Coil

H707

YL

Impl Cont Pump Torque Solenoid

309

GY

Alternator Regulator Terminal

H730

BR

Reverse Output - Shuttle Control

310

PU

Start Aid Switch To Start Aid Solenoid

H731

GY

Forward Output - Shuttle Control

320

OR

Horn Relay Coil To Switch

H764

GY

Rear Steering Position Sensor

321

BR

Backup Alarm Lamp Travel Alarm

H768

BR

AWS Solenoid Ground 2

322

GY

Warning Horn (Forward)

H769

BR

AWS Solenoid Ground 3

324

BU

Differential Lock Solenoid

H770

BR

AWS Solenoid Ground

327

PK

Shutdown Solenoid

H771

BR

Side Shift Lock Solenoid

331

OR

Backup Alarm Relay Coil

J764

BR

Switch/Sensor Return (8v)

WH

Stick Extend Solenoid +

Basic Machine Circuits

3 14

D 13 16

1

9

10

15

6 7

2

333

GN

Scraper Key Switch 'R' Terminal

K764

367

BU

Warning Horn - Rear

K766

PK

Stick Retract Solenoid +

384

BU

Relay To Glow Plugs

L740

BR

Analog Sensor Return (+5V)

A305

YL

Horn Power From Relay

M719

GN

Sideshift Left Switch

A346

BU

MSS Start Relay Interrupt

M720

BU

Sideshift Left Relay

A347

GN

Diode Ass’y - Start Relay Interrupt (MSS)

M721

WH

Sideshift Right Switch

P789

PK

Alarm Horn Output

GY

Pattern Change Solenoid On

Monitoring Circuits 403

GN

Alternator (R) Terminal

R762

404

YL

Opr Mon Hydraulic Oil Temperature

R763

BU

Pattern Change Solenoid Return

GY

Opr Mon Oil Pressure (Low)

U763

BU

Circle Drive Control (Signal)

406

PU

Opr Mon Coolant Temp

X750

OR

Fwd/Rev Solenoid Return From Controller

420

OR

Opr Mon Fuel Filter/Low Accum Pressure

852

GN

Continuous Flow Sw - NO to Ground

432

PK

Opr Mon Brake Pressure (Oil)

892

BR

VMIS Start Mod Right (-) Port/CDL (-)

439

YL

Water In Fuel Sensor

893

GN

VMIS Start Mod Right (+) Port/CDL (+)

441

OR

Engine Coolant Temp Gage

A884

WH

AWS Diode to Differential Lock Relay

442

GY

Hydraulic System Temperature Gage

E803

YL

Right Ind Steer Solenoid

BU

Left Ind Steer Solenoid

405

447

PK

Fuel Level Gage

E804

450

YL

Tach Sender (+)

E885

OR

AWS Parity Signal

452

PU

Torque Converter

F846

PU

MSS Indicator LED Driver #1 (Red)

E455

BR

Hydraulic Oil Filter

G848

GN

MSS Indicator LED Driver #2

E479

YL

Overload Warning Press Switch

X800

OR

+8V Sensor Power

F420

GN

Warning Lamp (General)

900

PU

XMSN Shift Sol No. 5 Or 4

F443

GN

Stability Warning Press Sw Out

902

BR

XMSN Shift Sol No. 7

F444

PU

Stability Warning Sw to Press Sw

903

GY

XMSN Shift Sol No. 8

G423

PK

High Pressure Implement Filter - Rear

911

YL

AWD Mode Switch Jumper

922

BR

XMSN Forward Solenoid Return

Accessory Circuits

14 16

10

9 7

A

13 6

17 1

15

3

500

BR

Wiper - Front (Park)

923

GY

XMSN Reverse Solenoid Return

501

GN

Wiper - Front (Low)

973

BR

CST Autoshift- Auto/Manual Switch 2

502

OR

Wiper - Front (Hi)

975

WH

CST Autoshift- Sol Return

503

BR

Wiper - Rear (Park)

976

OR

Ride Control Solenoid #1

506

PU

Washer - Front

977

YL

CST Autoshift- Auto/Manual Switch #1

507

WH

Washer - Rear

985

GY

Crab Steer Solenoid

508

PU

Radio Speaker - Left

E900

WH

ECPC Trans Output Speed +

509

WH

Radio Speaker - Left (Commom)

E901

GN

ECPC Trans Output Speed -

WH

Implement Lockout Switch To Ground (N.O.)

511

BR

Radio Speaker - Right

E917

512

GN

Radio Speaker - Right (Common)

E918

GN

Implement Lockout Switch To Ground (N.C.)

513

OR

A/C Compressor/Refrigerant Pressure Sw.

E991

GY

Multi-Function Output #3

515

GY

Blower Motor (HI)

G962

OR

Implement Lockout Solenoid / Diode

516

GN

Blower Motor (MEDIUM)

G981

PU

Travel Alarm Disable

517

BU

Blower Motor (Low)

L998

OR

Auxiliary Hydraulic Solenoid B

518

OR

Hazard Flasher To Switch

L999

GN

Auxiliary Hydraulic Solenoid C

521

YL

A/C Switch To Refrigerant Switch

M936

BR

Flow Control Switch

WH

A/C Clutch To Thermostat Switch

M937

GN

Flow Control Prox Sw #1

537

GN

Turn Signal Switch To Flasher

M952

BU

LH Joystick

552

WH

Four Wheel Drive Solenoid

M965

GN

RH Joystick

564

GY

Rear Wiper Interrupt Switch To Wiper Sw.

M968

BU

Coupler Switch Interconnect

568

GN

Park Brake Warning Buzzer

M969

YL

Coupler Switch Interconnect

522

B D 2

MACHINE CONNECTOR AND COMPONENT LOCATIONS

Flood Lamp Rear (ATCH) Control Circuits

159

B

17

Flood Lamp - Rear

569

PK

A/C Switch Jumper #2

N939

GN

Ride Control Solenoid #2 (On)

578

BU

Auxiliary Washer

N945

OR

AWD Sw to AWD Relay

585

YL

Aux Hydraulic - Open

N957

PK

RS-232 RXD - COMM #1

OR

RS-232 TXD - COMM #1

586

BR

Aux Hydraulic - Closed

N960

590

GY

Intermittent Wiper

N970

YL

RS-232 DTR - COMM #1

C511

WH

Relay Power

N973

BR

RS-232 DCD - COMM #1

C568

WH

Blower Motor

N979

GN

RS-232 Signal Ground - COMM #1

E528

PU

HVAC On/Off Switch To Blower Switch

N997

WH

PWM - Freq In #1

E529

YL

Blower Switch Jumper

P993

OR

Auxiliary Hydraulic Select

E540

PK

Aux Hydraulic Interlock

R912

OR

Hydraulic Pedal Lock Solenoid

E543

WH

Aux Hydraulic Return Solenoid - Close

T904

BU

RH Stabilizer Up - Switch To Solenoid

E544

GN

Aux Hydraulic Return Solenoid - Open

T907

GN

LH Stabilizer Down - Switch To Solenoid

Lighting Circuits

T969

YL

Aux Circuit 1

601

GY

Dash Lamp (Hi)

T970

GY

Stick Extend Solenoid (+)

603

PK

Rotary Beacon

T971

OR

Aux Circuit 3

604

OR

Stop Lamp

T972

GN

Stick Extend Solenoid (+)

605

YL

Turn Lamp - Left

X977

YL

Fuel Pump +V Supply

606

GY

Turn Lamp - Right

607

PK

Flood Lamp - Front

432E, 434E, 442E, and 444E Backhoe Loader Electrical System 432E: JBA1-UP

434E: SJL1-UP

442E: EME1-UP

444E: NBA1-UP

Volume 1 of 2: Cab and Chassis © 2010 Caterpillar, All Rights Reserved

Printed in U.S.A.

Harness And Wire Electrical Schematic Symbols Symbols

T

Pressure Symbol

Temperature Symbol

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. 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. 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. 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).

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

L-C12 3E-5179

AG-C4 111-7898

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

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 Component Part Number

9X-1123

Fuse (5 Amps)

325-AG135 PK-14 Harness identification code: This example indicates wire group 325, wire 135 in harness "AG".

Wire Gauge Wire Color

Component Location Volume 1 Schematic Location

Machine Location

Schematic Location

Machine Location

Alarm - Action

C-14

B

Solenoid - (1) Hoe Aux Valve 2

F-14

10

Cluster - Gauge

D-14

B

Solenoid - (2) Hoe Aux Valve 2

F-14

10

Control FNR Automatic

F-8

A

Switch - Auto Manual

F-7

A

Control - FNR Manual

G-8

A

Switch - AWD

H-7

A

Control - Machine

I-6

7

Switch - AWD (Italy)

H-7

A

Diode - Fuel Lift Pump

C-4

D

Switch - Beacon

D-13

B

Component

Connector Location Volume 1 Schematic Location

Machine Location

CONN 1

D-14

B

CONN 2

F-13, G-13

1

CONN 3

G-12

1

Connector Number

CONN 5

H-12

1

CONN 6

B-11

B

CONN 7

B-11

B

CONN 8

B-11

B

CONN 9

C-11

B

CONN 10

C-11

B

CONN 11

D-11

3

CONN 12

E-11

3

CONN 13

E-11

3

CONN 14

D-8

D

CONN 15

B-7

6

CONN 16

C-7

2

CONN 17

C-4

6

CONN 18

B-4

6

CONN 19

B-4

6

CONN 21

F-13, G-13

6

CONN 22

G-12

6

CONN 23

G-12

7

CONN 24

H-1

7

CONN 25

H-1

7

CONN 26

I-1

6

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.

Component

Ground - Control

D-6

6

Switch - Brake (LH)

H-8

A

Ground - Lower Cab

D-6

6

Switch - Brake (RH)

H-8

A

Handle - Machine Right

F-13

17

Switch - Column Multi Function

E-8

A

Loader Joystick

B-7

B

Switch - Continuous Flow 7-8

E-13

B

Loader Joystick Base

C-7

B

Switch - Control Pattern

I-8

17

Module - PRM 1

I-3

D

Switch - Differential Lock

H-8

16

Module - PRM 2

I-3

D

Switch - Front Work Lamp (ATCH)

D-13

B

Module - PRM (HVAC)

I-2

D

Switch - Hazard

E-8

A

Motor - Seat Group

F-1

13

Switch - Implement Lockout

B-12

B

E-11

B

Switch - Key

C-14

B

Port - Power 1 Port - Power 2

I-8

14

Switch - Loader Lock

G-7

A

Relay - AWD

F-3

D

Switch - neutral xmsn handle

F-1

B

Relay - Backup Alarm

G-3

D

Switch - Park Brake

D-11

B

Relay - Differential Lock

D-3

D

Switch - Power Side Shift

E-14

B

Relay - Flasher

I-1

D

Switch - Pressure (Hyd Oil Filter Bypass)

G-1

9

Relay - Fuel Lift Pump

C-3

D

Switch - Rear Fog Lamp

C-13

B

Relay - Horn (Fwd)

G-3

D

Switch - Rear Wiper

C-13

B

Relay - Horn (Rear)

G-3

D

Switch - Rear Work Lamp (ATCH)

D-13

B

Relay - Implement Disable

D-3

D

Switch - Ride Control

G-7

A

Relay - Neutral Start

C-3

D

Switch - Ride Control (LL)

G-7

A

Relay - Ride Control

F-3

D

Switch - Roading

F-7

A

I-12

D

Switch - Side Shift Lock

E-13

B

Relay - Torque Limiter

I-1

D

Switch - Start Aid

C-13

B

Resistor - CAN Terminating 1

C-8

D

Switch - STD Front Work Lamp

E-14

B

Resistor - CAN Terminating 2

G-13

D

Switch - STD Rear Work Lamp

E-14

B

Sensor - Temperature (Hydraulic Oil)

G-1

9

Switch - Transmisson Lock

H-7

A

Relay - Stabilizer Timer

(ATCH)

Valve - Stabilizer Machine locations are repeated for components located close together. A = Located inside front console. B = Located inside right console. D = Located in or near relay panel.

(ATCH)

I-14

10

Component Identifiers (CID¹) Module Identifier (MID²) Machine ECM (MID No. 039) CID

Component

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.

2

Data erratic, intermittent, or incorrect. Voltage above normal or shorted high.

0041

8 VDC Sensor Power Supply

3

0168

Electrical System Voltage

4

Voltage below normal or shorted low.

0247

SAE J1939 Data Link

5

Current below normal or open circuit.

0262

5 Volt Sensor Power Supply

6

Current above normal or grounded circuit.

0367

Ride Control Switch

7

Mechanical system not responding properly.

0368

Transmission Auto/Manual Switch

8

Abnormal frequency, pulse width, or period.

0490

Implement Lockout Switch

9

Abnormal update.

0600

Hydraulic Oil Temperature Sensor

10

Abnormal rate of change.

0626

Neutral Trans Lock Switch

11

Failure mode not identifiable.

0629

Neutralizer Switch

12

Bad device or component.

0702

FNR Lever Diagnostics

13

Out of calibration.

1251

Alternator R-Terminal Signal

14

Parameter failures.

1401

Transmission Solenoid 1

15

Parameter failures.

1402

Transmission Solenoid 2

16

Parameter not available.

1403

Transmission Solenoid 3

17

Module not responding.

1404

Transmission Solenoid 4

18

Sensor supply fault.

1405

Transmission Solenoid 5

19

Condition not met.

1406

Transmission Solenoid 6

20

Parameter failures.

1529

Implement Front Aux Quick Coupler Flow Switch

2236

Hoe Aux Valve #1 Port A Solenoid

2237

Hoe Aux Valve #1 Port B Solenoid

2242

Loader Aux Valve Port A Solenoid

2243

Loader Aux Valve Port B Solenoid

2244

Hoe Aux Valve #2 Port A Solenoid

2245

Hoe Aux Valve #2 Port B Solenoid

2529

Implement Front Aux Slide 1 Sensor

2530

Left Joystick Slider

2531

Right Joystick Slider

2735

Implement Front Aux Continuous Flow Switch

2736

Implement Rear Aux Continuous Flow Switch

Related Electrical Service Manuals Title 143-0539

SENR3828

Machine Troubleshooting:

KENR8849

Engine Troubleshooting:

SENR9969

Resistor, Sender and Solenoid Specifications Part No. 134-2540

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

Form Number

Electric Starting Motor:

Component Description Resistor:

Resistance (Ohms)¹

CAN Terminating

120 54°C (130°F) - 560 to 716 110°C (230°F) - 72 to 82

244-3106

Sender:

Coolant Temperature

4W-9972

Sender:

Converter Temperature

321-1327

Sender:

Fuel Level (EST)

303-2933

Sender:

Fuel Level (Non-EST)

54°C (130°F) - 560 to 716 110°C (230°F) - 72 to 82 Empty - 246-252 Full - 27-33 Empty - 246-252 Full - 27-33

¹ At room temperature unless otherwise noted.

Event Codes Machine ECM EID 43

Off Machine Switch Specification

Description Low System Voltage Warning

50

High System Voltage Warning

¹ The CID is a diagnostic code that indicates which circuit is faulty.

153

High Speed Direction Shift

² The MID is a diagnostic code that indicates which electronic control module diagnosed the fault.

232

High Fuel/Water Separator Water Level

282

Implement Hydraulic Oil Filter Restricted

391

Air Filter Restriction

627

Machine Driven with Parking Brake On

797

Dash Brake Boost Low Pressure

861

Machine Synchronize Clock Manual Alignment

878

High Hydraulic Oil Temperature

979

Stabilizer Raised While Transmission in Gear

Part No. 311-7711

Function

Actuate

Boosted Brake Pressure

3000 kPa MAX @ -40 C (435.1 psi) to +121 C

Deactuate 2387 ± .345 kPa @ -40 C (346 ± 0.05 psi) to +121 C

Contact Position Normally Closed

(Dimensions: 48 inches x 35 inches)

Power Circuits

A

Description

36 Page,

Wire Color

KENR8848 VOL 1 of 2

Wire Number


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