Peterbilt C10, C12, 3176B, 3406E Schematic

CAT C10/C12, 3176B, 3406E Engine Schematic SK24807 D 01

508

A508

PTO
ON/OFF
SWITCH

(SEE NOTE 5)

SPS IDLE TIMER

YEL

BLK

RED

TO A239
SPARE CIRCUIT

(SEE NOTE 6)

IGN

BAT

12

IGNITION
SWITCH

CAT ECM
CONNECTOR
(40-PIN)

1

418

2

569

3

552
576

4

577

5

455

6

417

7
8

A508

9

551

10

579

11

581

12

239
225

13

464

14

463

15

578

16

580

17

197

18

224

19
20

461

21

-

22

419
568

23

465

24

462

25

660

26

468

27

522 522

28
29

457

30

-

31

-

32

-

661

33
34

-

582

35

567

36

458

37
38

-

662

39

466

40

NOTES:

1) SCHEMATIC FOR CATERPILLAR 3406E/3176 ENGINES IN CONVENTIONAL MODELS.

2) ALL PRESSURE SWITCHES SHOWN NOT PRESSURIZED.

3) ALL RELAYS SHOWN NOT ENERGIZED.

4) CLUTCH SWITCH SHOWN WITH CLUTCH ENGAGED (POWER TO THE DRIVE WHEELS.)

5) CONNECT PTO TOGGLE SWITCH IN SERIES WITH THE PARKING BRAKE SWITCH ONLY
WHEN SEPARATE SWITCH ON DASH OPTION TO ENGAGE PTO IS REQUIRED.

6) BRAKESAVER AND IDLE TIMER SHUTDOWN OPTIONS CANNOT
BE USED TOGETHER.

J1587
ATA
DATA
LINK AND
CAP

23

418

417

661

662

ABC

BAT
BAS

J1939
DATA
LINK AND
CAP

AUTOSHIFT
J1939
(OPTION)

CAT COLD
DASH SHUTDOWN
SWITCH

MARK IDLE TIMER

660

568

ABC
COOLANT
LEVEL

SENSOR

569

567

457

D

CBA

D

XA12 23

X

ENGINE HARNESS

5

6

7

6

7

0

GROUND TO
CYLINDER
HEAD STUD

PARKING BRAKE SW
(NC)
(OPENS AT 2-6 PSI)

4

4

6

5

5

7

A

BT
BS

A

CLUTCH SWITCH

(NO)

(SHOWN WITH
CLUTCH ENGAGED)

CONST PWR
MAIN CAB
HARN

239

197

BABAT

S

ROAD
SPEED
SENSOR

A508 457

(OPENS AT 2-6 PSI)

A464

(OPENS AT 2-6 PSI)

A464 464

BRAKESAVER
APPLICATION SWITCH

(OPENS AT 2-6 PSI)

19 19

FIREWALL
CONNECTOR

A

418 418

B

417

417

-

C

-

D

576

576

-

E

-

F

455

455

-

G

-

H

A508

A508

-

J

-

K

579

579

L

581

581

-

M

-

N

225

225

P

464

464

Q

463

463

R

578

578

S

580

580

T

457

457

U

224

224

V

461

461

W

419

419

X

552

552

Y

551

551

-

Z

-

a

462

462

b

466 466

c

468

468

d

522

-

e

-

f

582

582

g

458

458

THROTTLE
POSITION
SENSOR

CKT FUNCTION

CAT ELEC SYSTEM SHUTDOWN

12

CAT ELEC SYSTEM SHUTDOWN

A12

12V POWER (KEY ON)

23

VEHICLE SPEED IN (+)

197

ENGINE FAN

220

ENGINE BRAKE (FRONT)

224

ENGINE BRAKE (REAR)

225

SPARE 12V (KEY ON, FUSED)

226

(-) GROUND

239

DASH POWER (KEY ON, FUSED)

242

DASH ILLUMINATION

253

FUSED UNSWITCHED POWER

298

MAIN ACCESSORY POWER

304

CRUISE CONTROL "ON" LIGHT

354

417

418

CHECK ENGINE LIGHT

419

WARNING LIGHT

438

ENGINE POWER

453

PARKING BRAKE
SWITCH

(NC)

SERVICE BRAKE
SWITCH
(NC)

(NC)

DATA LINK (+)

DATA LINK (-)

457

SHUTDOWN RELAY

458

457

582

CBA

J11

ABC

P11

WHBKRD

SIGNAL

RETURN

POWER

(PWM)

FUSE/RELAY
HARNESS

19 19

239A466

CHASSIS GND

418

417

BAT
BAS

J1587
ATA
DATA
LINK AND
CAP

455

457

458

461

462

463

464

465

466

468

508

A508

522

551

552

A554

B554

KEY

23

CONST PWR
ROOF HARN

418

417

699

552

551

ABCDEF

BAT
BAS

DIAGNOSTIC
CONNECTOR

(AND CAP)
J1922
ATA
DATA

LINK AND
CAP

DIAGNOSTICS POWER454

ECM POWER

GROUND-SENSORS

THROTTLE SENSOR OUTPUT

CRUISE - ON

CRUISE - SET

CRUISE - RESUME

SERVICE BRAKE SWITCH

CLUTCH SWITCH

ENGINE BRAKE ENABLE

WARNING BEEPER

PTO ON/OFF SWITCH

PTO VALIDATION SIGNAL

ENGINE FAN DISABLE

J1922 DATA LINK (+)

J1922 DATA LINK (-)

BRAKESAVER POWER

BRAKESAVER POWER

23

A23

SHUTDOWN CONNECTION

BRAKESAVER FUSE

226

10 AMP

A466

A466

239

CKT FUNCTIONCKT FUNCTION

C554

554

557

567

568

569

576

577

578

579

580

581

582

660

661

662

699

700

ENGINE POWER RELAY

700

A23

BRAKESAVER/
SHUTDOWN RELAY
(SEE NOTE 6)

A12

C554

466

A466

ENGINE FAN RELAY

226

522

700

454

455

12

B

12

5

B

7

A

6

R

T

E

T

C

E

O

5

R

R

A

Y

D

M

E

E

P

V

R

E
N
T

2
9
8

CONNECT AT MAIN
CAB CIRCUIT
BREAKER

123456789

700

454

455

7
0
0

F

P

U

O

S

2

W

E

0

/

E

R

A

R

E

M

L

P

A
Y

2
9
8

457

457

A12

A

A12

BRAKESAVER POWER

BRAKESAVER POWER

BRAKESAVER ON/OFF

+5V LOW COOLANT SENSOR

COOLANT LEVEL LOW

COOLANT LEVEL NORMAL

BATTERY EVENT RECORDER

ECM GROUND STUD

SPEEDOMETER (+)

SPEEDOMETER (-)

TACHOMETER (+)

TACHOMETER (-)

+8V THROTTLE PEDAL

J1939 DATA LINK (SHIELD)

J1939 DATA LINK (+)

J1939 DATA LINK (-)

DIAGNOSTIC POWER

FUSE/RELAY POWER

ECM FUSE

455453

-

-

CAB
HARNESS

226

CONNECT TO SPARE
POWER CONNECTION #3
USE 20 AMP FUSE

15 AMP

DIAGNOSTICS FUSE

FAN FUSE

10 AMP

10 AMP

220A220

454453

220

226

239

ABC

220

226

239

242

239

C0NNECT TO SPEEDO
HARNESS SPARE

457

454

JAKE BRAKE
ON/OFF
SWITCH

CHASSIS GND
(SHUTDOWN
OPTION)

+

WARNING

BEEPER

354

461

CRUISE
ON/OFF
SWITCH

ABS

OFF
ON

CONNECTOR

554 A554

-

438
468

OFF
ON

242

457 457

438

419419

438

4
1
9

WARNING LIGHT BAR
CONNECTORS
(MAIN CAB HARNESS)

JAKE BRAKE
RANGE SWITCH

BRAKESAVER

AUTO/MAN

SWITCH

OFF
ON

557

239

CYLINDER HEAD

GROUND STUD

CRUISE SWITCH ILLUMINATION

A508A508A508

SERVICE ONLY

E.C.N. NO.

DATE

BY

LOW
MED

HIGH

B554554

460

460

BRAKESAVER

AUTO/MANUAL

SOLENOID

SET
NONE
RES

462

463

CRUISE
SWITCH
SET/RESUME

354

2
2
0

2
2
0

4

354354

220

3
8

9801586

12-21-98

J.M.WATSON REM

224

225

B554

239253

220

TO ENGINE
HARNESS

453

239

12

554

557

A220

239

A508

464

466

522

554

557

-

101112

A508

464

466

522

554

557

-

6
9
9

D

I

P

A

O

1

G

0

W

N

A

O

E

M

R

S

P

T
I

C

2
9
8

SK24807.FM