Cat 3176 Diesel Truck Engine Electrical System Schematic Manual - PDF DOWNLOAD

SENR3912-04 May 1991

3176 Diesel Truck Engine Electrical System 2YG3454-UP

© 1991 Caterpillar

All Rights Reserved

Printed in U.S.A.

CATERPILLAR RESPONSIBILITY

OEM RESPONSIBILITY

BATTERY 1

CONTROL GROUP (3176)

SENSOR SPEED/TIMING

+V TIMING TIMING RETURN SPEED/TIMING

SENSOR COOLANT TEMP

+V COOLANT COOLANT RETURN COOLANT

+V

SENSOR FUEL PRESSURE

PRESS. RETURN FUEL PRESS.

37 27 35

6800-BR 6817-GN 6818-PK 6801-YL 6802-GY 6803-WH 6804-PU 6805-OR 6806-BU

OR BK WH

P9 J9 A B C

OR BK GN

J10 P10 A B C

6791-OR 6789-GY 6441-BR

OR YL GN

P16 J16 A B C

6794-PK 6789-GY 6795-BU

PRESS. RETURN OIL PRESS.

14 4

12 21 1 11

7

9 19 5 15 25

10A

J4

A E D B F G H J C

- 12V +

1

ALTERNATOR

6202-BK 6202-BK 6121-GN 6121-GN

C G J H F D E

ENGINE CYLINDER HEAD (GND STUD)

A J8

B

100 mA 100 mA

DASH DATA LINK

4

NOTE G

S

ON

B

ST

R KEY SWITCH S

G MTR BAT

STARTER MOTOR

P8

6740-PU 6790-PK 6788-YL

C OFF 5 2 3

6

P7 J7

+ 12V -

GND

6776-YL 6737-PU 6739-BU 6738-OR 6741-GY 6797-WH 6793-PU

6702-BR 6704-YL 6701-GN 6706-WH 6707-PU 6708-OR 6709-BU 6798-GY

6796-OR 6464-YL 6789-GY

J5 P5 A B C D E F G H J

J20

+V

8 18 17 36 26 16 6

15A

RELAY (OPTIONAL)

SERIES PAR. SW P4

NOTE B

SENSOR OIL PRESSURE

38 29

SENSOR FUSE

12 AWG 25FT MAX LENGTH

10 39

ECM FUSE

14 AWG 10FT MAX LENGTH

30 20

-BATTERY -BATTERY +BATTERY +BATTERY

24 40 28

RETARDER ENABLE DIAGNOSTIC LAMP ATA DATA LINK+ ATA DATA LINKWARNING BUZZER SPARE SW IN 1 SPARE SW IN 2

+V OIL PRESS. OIL PRESSURE SENSOR RETURN ANLG

31 22 34 2 23 3 33 32 13

THROTTLE VEHICAL SPEED PARK BK SWITCH CRUISE CONT ON/OFF CLUTCH RESUME/DCLR SET/ACCEL BRAKE SWITCH

+V FUEL PRESSURE FUEL PRESSURE

CYL NO.1

6794-PK 6795-BU

CYL NO.2

+V COOLANT COOLANT

CYL NO.3

6791-OR 6441-BR

CYL NO.4

6740-PU 6790-PK 6788-YL

CYL NO.5

6800-BR 6817-GN 6818-PK 6801-YL 6802-GY 6803-WH 6804-PU 6805-OR 6806-BU

CYL NO.6

1 2 3 4 5

ECM GND STRAP

+V TIMING TIMING RETURN SPEED/TIMING

+V BOOST BOOST RETURN

ECM

CYL COMMON 1&2 CYL COMMON 3&4 CYL COMMON 5&6 CYL NO. 1 CYL NO. 2 CYL NO. 3 CYL NO. 4 CYL NO. 5 CYL NO. 6

TRANSDUCER

BATTERY 2

J12 A B C F D H J E G

A B C

P20

OR YL GN

P17 J17 A B C

6796-OR 6789-GY 6464-YL

0.3A CURRENT LIMIT

NOTE H

WARNING BUZZER 0.3A CURRENT LIMIT DIAGNOSTIC LAMP

SENSOR THROTTLE POSITION

RD BK WH

+ BATTERY THROTTLE RETURN THROTTLE

P11 J11 A B C

5mA 5mA

40mA 5mA

5mA

VEHICLE SPEED BUFFER

RD BK GN OR BR

+ BATTERY - BATTERY OUT(SPEEDOMETER)(*) OUT(ENGINE CONT)(*) IN

P14 J14 A B C D E

(BRAKE APPLIED) PARKING N/C

SET/RESUME (BRAKE APPLIED POSITION)

40mA 5mA 5mA

CLUTCH N/C

IN

(PEDAL RELEASED POSITION)

5mA

WH WH CATERPILLAR RESPONSIBILITY

OEM RESPONSIBILITY

VEHICLE SPEED SENSOR

(PEDAL RELEASED POSITION) 5mA

BRAKE N/C DASH DATA LINK

CRUISE ON/OFF

20mA

GN BR

0.3A CURRENT LIMIT SPEEDOMETER (NOTE F) BAT. SIGNAL GND

NOTE A:

A DASHED OUTLINE SPECIFIES A COMPONENT REQUIRED ONLY FOR OPTIONAL FEATURES

NOTE B:

APPROPRIATE PERSONALITY MODULE REQUIRED FOR OIL PRESSURE SENSOR OPERATION.

NOTE C:

SPEEDOMETER SHOWN HAS INTERNAL SIGNAL (-) AND GROUND CONNECTION. IF INTERNAL CONNECTION IS NOT PRESENT. WIRE AS SHOWN BELOW

NOTE C

NOTE D

NOTE G:

NOTE H:

THE CYLINDER HEAD GROUND STUD MUST HAVE A DIRECT WIRE CONNECTION TO BATTERY(-). THIS CONNECTION CAN BE MADE AT THE STARTER(-) TERMINAL OR MAIN FRAME GROUND LUG. THIS WIRE MUST HANDLE FULL ALTERNATOR CHARGING CURRENT (6 AWG WIRE MINIMUM) NO ADDITIONAL CONNECTIONS ARE ALLOWED TO ANY WIRES TO THE LEFT OF LINE WITHOUT ENGINEERING APPROVAL

NOTE F:

TO VEHICLE SPEED BUFFER

VEHICLE SPEED BUFFER IS DESIGNED TO OPERATE WITH SPEEDOMETERS WITH THE FOLLOWING SIGNAL CHARACTERISTICS. VEHICLE SPEED BUFFER MAXIMUM SPEEDOMETER VOLTAGE

SIGNAL LOAD CURRENT

±6 VDC ±3 VDC ±1 VDC

0.0mA 1.0mA 10.0mA

OUTPUT VOLTAGE OF THE VEHICLE SPEED BUFFER IS A SQUARE WAVE WITH THE SAME FREQUENCY AS THE MAGNETIC PICKUP SENSOR SIGNAL AND THE AMPLITUDE WILL DEPEND UPON SPEEDOMETER LOAD CURRENT

PIN C PIN B

BAT.

RETARDER BRAKE CONTROL MODULE

SPEEDOMETER

SIGNAL

TO CYLINDER HEAD GROUND STUD

GND

NOTE D:

SINGLE POINT GROUND CONNECTION AT SPEEDOMETER REQUIRED FOR VEHICLE SPEED BUFFER AND SPEEDOMETER

NOTE E:

"SINGLE" WINDING MAGNETIC PICKUP SENSOR REQUIRED.

D66619