3126E Wiring Schmatic

ECM AMP Connectors

SENR9675 May 2002 6 HEUI Injectors

Engine Control Module

P ID -F MI

Cab Diagnostic Connector

- 12 V +

No D et ec te d F au lt s

1 1 1

Cy li n d er 1 F aul t

ECM Side

ECM Connector P1

B oo st P re ss S en so r S ho rt C ir cu it

25

Ex ce s s ive B oos t Pr es s u re

25

72

1 05 -0 3

I nl et M an if ol d A ir T em p S en so r O pe n C ir cu it

3 -1 1

C y l in de r 3 F au lt

73

1 05 -0 4

I nl et M an if ol d A ir T em p S en so r S ho rt C ir cu it

Cy li nd er 4 F au lt

73

1 08 -0 3

A tm os ph er ic P re ss S en so r O pe n C ir cu it

38 38 26

5 -1 1

Cy l in de r 5 F au lt

74

1 08 -0 4

A tm os ph er ic P re ss S en so r S ho rt C ir cu it

26

6 1 1

Cy li n d er 6 F aul t

7 4

1 10 0 0

Hi gh C oo l a nt T em p W ar n i ng

61

C he ck T im in g S en so r C al ib ra ti on

42

1 10 -0 3

C o ol an t T em p S en so r O pe n C ir cu it

3 0- 08 3 0- 13

Accelerator Pedal Position Sensor

F la sh Codes

1 02 -0 4 1 02 0 7

C y li nd er 2 F au lt

2 2- 13

Cruise Control On/Off & Set/Resume Switches

Harness Side

D es cr ip ti on

55 7 2

2 -1 1

4 -1 1 Batteries

Diagnostic Code Listing F la sh P ID -F MI Codes

D es cr ip ti on

0 -0 0

I n v al id P TO T hr ot tl e S ig na l

8 V ol t S up pl y A bo ve N or ma l

4 1- 04

8 V ol t S up pl y B el ow N or ma l

42-11

29

PT O T hr ot tl e S en so r C al ib ra ti on

4 1- 03

C oo la nt T em p S en so r S ho rt C ir cu it

27 27

1 10 -1 1

V er y H ig h C oo la nt T em p

61

1 11 -0 1

L ow C oo la nt L ev el W ar ni ng

62

21

Injection A ctuation Pres s

1 10 -0 4

29 21

18

1 11 -0 2 1 11- 11

Co ol an t L ev el S en so r F au lt V ery L o w C ool ant L e v el

12 6 2

Control Valve Driver Fault Injection Actuation Pressure Control Valve (IAPCV)

Ignition Key Switch

4 3- 02

I gn it io n K ey S wi tc h F au lt

64-02

Loss of Engine RPM Signal on Engine

71

1 64 -0 0

I n je ct io n A ct ua ti on P re ss O ut o f R an ge

17

34

1 6 4- 0 2

I n j e ct i on A c tu a ti o n P r es s S e ns o r E r ra t ic

15

34

1 6 4- 0 3

I n j ec t io n A c tu a ti o n P r es s O p en C i rc u it

15

Speed and Timing Sensor Number 2

Clutch and Service Brake Switches

64-11

No Pattern on Engine Speed and Timing Sensor Number 2

Top Camshaft Speed/Timing Sensor

7 0 -0 5 C a t e r p i l l a r

Harness Side

ECM Side ECM Connector P2

DT Co Conn nnec ecto tor r Re Recep cepta tacl cle e

Bottom Camshaft Speed/Timing Sensor

I n s t a l l e d

Injection Actuation Pressure Sensor

DT Co Conn nnec ector tor Pl Plug ug

7 0- 06

Coolant Level Sensor

7 1- 00 d e l l a t s n I

7 1- 01 Check Engine Lamp

M E O

3126E Truck Engine Electricall System Electrica

Warning Lamp

Speedometer & Tachometer 3

45

5

5

15

5

25

Boost Pressure Sensor

65

5

0

MPH

RPM X 1000

15 39

I nt er mi tt en t B at te ry P ow er t o t he E CM

51

1 90 -0 0

E ng in e O ve rs pe ed W ar ni ng

35

P T O S h ut d ow n O c cu r re n ce

47

1 9 0- 0 2

8 4 -0 0

V e h ic l e O v er s pe e d W a rn i ng

41

1 9 0- 1 1

8 4- 01

L os s o f V eh ic le S pe ed S ig na l

31

2 24 -1 1

T he ft D et er re nt E na bl ed

8 4 -0 2

I n v a li d V e hi c le S p ee d S i gn a l

36

2 2 4- 1 4

E n gi n e C r an k in g / T h ef t D e te r re n t E n ab l ed

8 4- 10

DPF1-UP Pressure Switch

I n je c ti o n A c tu a ti o n P r es s S h or t C i rc u it I nj ec ti on A ct ua ti on P re ss S ys te m

1 68 -0 2

47

7 1 -1 4

8 4- 08

30

Plug Wedge

A/C High

1 6 4- 0 4 1 64 -1 1

01

L o ss o f R P M S i gn a l o n E n gi n e S p ee d

N o P a tt e rn o n E n gi n e S p ee d

34

34

and Timing Sensor Number 1

ReceptacleWedge

Atmospheric Pressure Sensor

49

I dl e S hu td ow n O cc ur re nc e

and Timing Sensor Number 1

25

5

85

49

I nl et A ir H ea te r S ho rt C ir cu it I d le S hu td ow n O ve rr id e

00

20

10

75

15

I n l e t A i r H e at e r O p en C i rc u it

Cooling Fan

Ve hi cl e S pe ed O ut o f R an ge

36

J 19 39 D at a L in k F au lt

00 58

2 32 -0 3

5 V ol t S up pl y A bo ve N or ma l

21

In va li d T hr ot tl e S ig na l In

32

2 32 -0 4

5 V ol t S up pl y B el ow N or ma l

21

9 1- 13

T hr ot tl e S en so r C al ib ra ti on

28

2 46 -1 1

S er vi ce B ra ke S wi tc h N um be r 1 F au lt

00

1 0 0- 0 3

V e hi cl e S pe ed R at e o f C ha ng e

2 31 -1 1

36

9 1- 08

O il P r es s S e ns o r O p en C i rc u it

24

2 4 7- 1 1

S er v ic e B r ak e S w it c h N u mb e r 2 F a ul t

00

Receptacle Wedge

1 00 -0 4

(Specific Ratings Only)

Plug Wedge

Vehicle Speed Sensor Oil Pressure Sensor

24

2 52 -1 1

I nc or re ct E ng in e S of tw ar e

59

V er y L ow O il P re ss

46

2 53 -0 2

C he ck C us to me r o r S ys te m P ar am et er s

56

1 0 2- 0 3

B o os t P r es s S e ns o r O p en C i rc u it

25

2 5 3- 1 4

T r uc k M a nu f . P a ra m et e r N o t P r og r am m ed

56

PTO Accelerator Position Sensor

Receptacle Wedge Plug Wedge

(Optional)

HD Connector Receptacle

O il P re ss S en so r S ho rt C ir cu it

1 00 -1 1

Fast Idle Enabled Lamp Or Wait To Start Lamp

HD Connector Plug

PTO Switch On

Lamp

Oil Temperature Sensor

(Optional)

Socket Contact

PTO On/Off & PTO Set/Resume Switches

Fast Idle Enable Switch

Coolant Temperature Sensor Pin Contact

Transmission Neutral Switch

Sealing Plug

Interface Relay (Engine Derate)

AT/MT/HT Transmission Relay

Inlet Air Temperature Sensor

Speed/Timing Sensor Connectors

IAPCV Connector

150 Series Receptacle

150 Series Plug

Intake Air Heater Relay

Exhaust Brake Exhaust Brake On/Off Switch

Intake Air Heater Lamp

Intake Air Heater A

©2002 Caterpillar All Rights Reserved

Printed in U.S.A.

SENR9675-00

3126E 3126E ENGINE ENGINE HARNES HARNESS S WIRING WIRING DIAGRA DIAGRAM M

INJECTOR HARNESS GROMMET

L983-WH

12 L983-WH

10 L984-OR

J303 P303

J302 P302

B A

B A

J305 P305

J304 P304

B A

B A

P2 J2

9 8 7

L983-WH

44

INJECTOR COMMON CYLINDERS 1 & 2

L985-YL

L984-OR

45


L985-YL

46


A706-GY

6

A706-GY A705-BU

55 54

INJECTOR CYLINDER 6 INJECTOR CYLINDER 5

4 3

A704-GN

39

INJECTOR CYLINDER 4

A703-BR

38

INJECTOR CYLINDER 3

2

A702-PU

37

INJECTOR CYLINDER 2

1

A701-GY

36 47

INJECTOR CYLINDER 1

L985-YL

J301 P301

ENGINE HARNESS CONNECTOR

11 L984-OR

J306 P306

B A

5

B A

INJECTOR

INJECTOR

INJECTOR

INJECTOR

INJECTOR

INJECTOR

CYLINDER

CYLINDER

CYLINDER

CYLINDER

CYLINDER

CYLINDER

NO.1

NO.2

NO.3

NO.4

NO.5

NO.6

P300 J300

67 68

A705-BU

1

A704-GN

63 64

A703-BR A702-PU

4

A701-GY

5 INJECTION ACTUATION PRESSURE CONTROL VALVE (IAPCV)

A

G854-PK

61

B

G855-PU

62 70

J500 P500

IAP CONTROL VALVE IAP CONTROL VALVE COMMON

ENGINE BOOST

ENGINE BOOST PRESSURE

GN

C

A746-PK

A746-PK

40

ENGINE BOOST PRESSURE

PRESSURE SENSOR

ENGINE PRESSURE SENSOR COMMON

YL

B

27

ENGINE INJECTION ACTUATION PRESSURE

OR

A

G829-GN G828-WH

G849-BR

ENGINE PRESSURE SENSOR +5V

6 7

J200 P200

ENGINE INJECTION ACTUATION PRESSURE SENSOR

A747-GY

3

G828-WH G849-BR

2 15

ENGINE PRESSURE SENSOR COMMON

C B

G829-GN

16

ENGINE PRESSURE SENSOR +5V

0R

A

G828-WH 994-GY G827-BU G826-BR

P204 J204

ENGINE ATMOSPHERIC

ENGINE ATMOSPHERIC PRESSURE

PRESSURE SENSOR NOTE A

GN YL

C B

A747-GY

ENGINE PRESSURE SENSOR COMMON ENGINE PRESSURE SENSOR +5V

OR

A

G828-WH

ENGINE OIL

ENGINE OIL PRESSURE SENSOR

42


41

ENGINE OIL PRESSURE SENSOR +5V

995-BU C967-BU

INPUT #16

TO ECM

34 32

ENGINE OIL TEMPERATURE

MOUNTING

ENGINE COOLANT TEMPERATURE

BOLT

35

INLET AIR TEMPERATURE

C

994-GY

YL

B

G827-BU

9

G826-BR

33

P201 J201 NOTE B

ENGINE OIL TEMPERATURE ENGINE TEMPERATURE SENSOR COMMON

26 18

G833-PK

ENGINE OIL TEMPERATURE SENSOR NOTE A

1

TOP CAMSHAFT ENGINE

10

SPEED/TIMING SENSOR

11

2

TOP CAMSHAFT SPEED/TIMING-

A

E963-BK

49

TOP CAMSHAFT SPEED/TIMING-

B

E964-WH

48

TOP CAMSHAFT SPEED/TIMING+

TOP CAMSHAFT SPEED/TIMING+

13 50

J401 P401

ENGINE COOLANT TEMPERATURE ENGINE TEMPERATURE SENSOR COMMON

BOTTOM CAMSHAFT SPEED/TIMINGBOTTOM CAMSHAFT SPEED/TIMING+

995-BU

1 2

ENGINE TEMPERATURE SENSOR COMMON

12

G846-YL G829-GN

J101 P101

ENGINE COOLANT TEMPERATURE SENSOR

ECM GROUND STRAP

60

GN

A

COMMON

53 G883-GN G846-YL


OR

ENGINE PRESSURE SENSOR COMMON ENGINE PRESSURE SENSOR +5V

17 24

ENGINE OIL PRESSURE SENSOR COMMON ENGINE OIL PRESSURE SENSOR +5V

ENGINE ATMOSPHERIC PRESSURE

25 51 52

G829-GN

P203 J203 NOTE B

PRESSURE SENSOR NOTE A

14

G829-GN GN YL

ENGINE INJECTION ACTUATION PRESS.

A

19 59

BOTTOM CAMSHAFT SPEED/TIMING-

58

BOTTOM CAMSHAFT SPEED/TIMING+

28

J402 P402

BOTTOM CAMSHAFT ENGINE

J100 P100

E965-BU E966-YL

B

G833-PK

29 30 31

SPEED/TIMING SENSOR

43

INLET AIR TEMPERATURE SENSOR

INLET AIR TEMPERATURE ENGINE TEMPERATURE SENSOR COMMON

1

C967-BU

22

2

G833-PK

23 56

J103 P103

57 65 E N G I N E

66

(+) BATTERY SUPPLY WIRES

K995-OR

69 20

J501 P501

INPUT SIGNAL WIRES TO ECM OUTPUT SIGNAL WIRES FROM ECM TO ENGINE CYLINDER HEAD

SENSOR SUPPLY VOLTAGE

1

C987-RD

2

G850-BU

C O N T R O L

21 G850-BU

8

INTAKE AIR HEATER RELAY

N/O

M O D U L E

RELAY

(NOT CYLINDER HEAD GROUND STUD)

SIGNAL PLUS

INTAKE AIR HEATER

COMPONENTS ARE SHOWN WITH THE KEY OFF

P648

SIGNAL MINUS

UNLESS OTHERWISE SPECIFIED: ALL WIRES TO BE 18 AWG OR LARGER SAE J1560 TYPE TXL

B

(-) BATTERY / SENSOR RETURN

OR EQUIVALENT. FOR TWISTED PAIR SPECIFICATION SEE J1708.

A

G850-BU C987-RD

NOTE A: THIS IS AN OPTIONAL FEATURE NOT INSTALLED ON ALL VEHICLES. NOTE B: CONNECTOR GENDER MAY BE REVERSED ON SOME VEHICLES.

3126E 3126E OEM VEHICL VEHICLE E HARNES HARNESS S WIRING WIRING DIAGRA DIAGRAM M 100A WITH 130A PEAK AT 11V INTAKE AIR

B

HEATER LAMP

A

C987-RD

J648

CIRCUITS WITHIN THIS AREA ARE RECOMMENDATIONS CHECK ENGINE LAMP

N/O R O 5 9 9 K

RELAY

D R 7 8 9 C

L994-YL E N G I N E

WARNING LAMP 659-PK

KEY SWITCH

FAST IDLE ENABLED LAMP

OFF ON

OR

START

NOTE A

G880-PK

659-PK

29

L994-YL

28

CHECK ENGINE LAMP

K998-BU G880-PK

30 31

OUTPUT #1 OUTPUT #9

WAIT TO

48

START LAMP

61 E718-PK E991-GY FLYBACK DIODE

EXHAUST BRAKE SOLENOID

NOTE A

G836-WH

EXHAUST BRAKE ON/OFF SWITCH

ALTERNATOR

STARTER

C974-PU

SIGNAL+ SIGNAL-

C973-GN

NOTE A

-BAT. A

SIGNAL-

451-BR

J H - 12V +

BATTERY 2

EXHAUST BRAKE ON/OFF SWITCH

63 36

SPEEDOMETER POSITIVE

G

E793-BU

J1587 +

F

J1939 SHIELD J1939 J1939 +

E

E794-YL A249-BK

BATTERY 1

F713-OR 450-YL

17 38

INPUT #14 TACHOMETER POSITIVE

451-BR

39

TACHOMETER NEGATIVE

D K990-GN C K900-YL NOTE A

E793-BU E794-YL

9 8

A249-BK

42

14 AWG GXL 14 AWG GXL 14 AWG GXL

20A

14 AWG GXL

BLOCK

J1939 DATA LINK SHIELD

K990-GN

34

J1939 DATA LINK NEGATIVE

K900-YL

50

J1939 DATA LINK POSITIVE

NOTE A

C978-BR

H795-PK

C979-OR

SET/RESUME SWITCH

FAST IDLE ENABLE SWITCH

NOTE A

H795-PK H795-PK

N/O MOMENTARY SWITCH

L902-GN

C975-WH

CRUISE CONTROL ON/OFF SWITCH

SERVICE BRAKE PEDAL POSITION SWITCH N/C

H795-PK (PEDAL RELEASED POSITION)

C992-PU

UNSWITCHED +BATTERY

229-BK 229-BK

65

-BATTERY

67

-BATTERY

G838-BR

19

OUTPUT #6 OUTPUT #7

101-RD

G882-WH

H795-PK

NOTE A

C977-BU

G839-BU

20 51

C978-BR

35

C979-OR

44

RESUME

K999-GN

56 58

INPUT #1 (PTO ON/OFF SWITCH) INPUT #2

40

INPUT #18

K980-PK L902-GN

21

C975-WH

59

OUTPUT #8 CRUISE CONTROL ON/OFF SWITCH

K982-YL

60

INPUT #3

C992-PU

45

G842-GY G882-WH G843-OR

6

C977-BU

22

G879-OR

G844-PK

N/O MOMENTARY SWITCH

+BAT.

G844-PK C983-WH

TRANSMISSION NEUTRAL SWITCH N/O (TRANSMISSION IN GEAR)

409-OR

A/C HIGH PRESSURE SWITCH N/C NOTE A

NOTE A

PASSIVE MAGNETIC VEHICLE SPEED

ACCELERATOR PEDAL POSITION

WH

B A C J 4 03

SENSOR ACCELERATOR

C984-YL 409-OR

2 46

CLUTCH PEDAL POSITION SWITCH +5V INPUT #7

49

ENGINE COOLANT LEVEL NORMAL

54 62

ENGINE COOLANT LEVEL LOW INPUT #12

E971-GN

41 69

G808-BU

1

G808-BU

32

G809-GN

2

G809-GN G845-PU

INPUT #11 VEHICLE SPEED IN POSITIVE

33

VEHICLE SPEED IN NEGATIVE

H795-PK

68 5

INPUT #8 (REMOTE ACCELERATOR) AP SENSOR/SWITCH SENSOR COMMON

C985-BU C986-BR

C985-BU

4

C986-BR

SENSOR BK RD

INPUT #13 INPUT #6

H795-PK

COMPONENTS WITHIN THIS AREA ARE CATERPILLAR PROVIDED ACCELERATOR PEDAL SENSOR/SWITCH SENSOR COMMON +8 V

SERVICE BRAKE PEDAL POSITION SWITCH INPUT #5

24

E971-GN

H795-PK

47 64

23

DIAGNOSTIC ENABLE SWITCH H795-PK

SET

G840-PU

(PEDAL RELEASED POSITION) NOTE A

UNSWITCHED +BATTERY

55

(PEDAL RELEASED POSITION)

CLUTCH PEDAL POSITION SWITCH N/C

IGNITION KEY SWITCH

52 53

SERVICE BRAKE PEDAL POSITION SWITCH #2 N/O +BAT.

70 25

101-RD

NOTE A NOTE A

J1587 DATA LINK NEGATIVE J1587 DATA LINK POSITIVE

1 14

MODULATOR FOR AUTOMATIC TRANSMISSIONS

INPUT SENSOR COMMON #2

57 43

NOTE A

TO ALLISON AT/MT/HT SHIFT

ENGINE

S E N R 9 6 7 5 0 0

SPEEDOMETER NEGATIVE

3

NOTE A

J1587 - 12V +

NOTE A

NOTE A

37 27

993-BR

J906-BR

NOTE A

OUTPUT #4

C974-PU NOTE A

450-YL

SIGNAL+

TACHOMETER

+BAT. B

BATTERY 3

OUTPUT #3

16

26 9 PIN CAB CONNECTOR

- 12V +

OUTPUT #2

12 13

C981-GY

C973-GN

NOTE A

MOTOR (12V)

GROUND

10

M O D U L E

15

NOTE A SPEEDOMETER

C O N T R O L

WARNING LAMP

P 4 03

COOLING FAN SOLENOID NOTE A

PEDAL POSITION

+8V

66

ACCELERATOR PEDAL POSITION

G837-YL

11

FLYBACK

G 84 11- GN

DIODE

L901-GY

7 18

OUTPUT #5 I NP UT # 4 INPUT SENSOR COMMON #1

NOTE A: THIS IS AN OPTIONAL FEATURE NOT INSTALLED ON ALL VEHICLES.

P1 J1 VEHICLE HARNESS CONNECTOR

TEMPERATURE SENSOR

+BATTERY SWITCHED

1 2 3 4

LAMP FLASHER TS1

AMBER LAMP

RED LAMP 4 3 2 1 +BATTERY UNSWITCHED

TS2

CRT TM DIAGNOSTIC MODULE tem S tatus yst Sys ure A larm ssu ress -Pre Over-P emp A larm Te r- T ver Ove lem obl m Pr ob tem Syste

S e C o r i a m m l D P o r a t a t

A l a r m


INJECTION ACTUATION PRESSURE SENSOR

TOP VIE VIEW W ATMOSPHERIC PRESSURE SENSOR

INLET AIR HEATER

BOOST PRESSURE SENSOR

INJECTOR HARNESS GROMMET

TYPICA TYPICAL L CRTTM DIAGNO DIAGNOSTI STIC C MODULE MODULE

ENGINE GROUND STUD CONNECTION

INJECTION ACTUATION PRESSURE CONTROL VALVE

INLET AIR HEATER RELAY

INLET AIR HEATER INJECTION ACTUATION PRESSURE SENSOR


ATMOSPHERIC PRESSURE SENSOR (SELECT RATINGS ONLY)

BOOST PRESSURE SENSOR

ENGINE HARNESS CONNECTOR J2/P2

INJECTOR HARNESS GROMMET ENGINE GROUND STUD CONNECTION

VEHICLE HARNESS CONNECTOR J1/P1

INJECTION ACTUATION PRESSURE CONTROL VALVE (IAPCV)

u t n p M M a a x I n I e H g ) r e r s u ( ( 2 2 0 0 " " s s I e s

P r 1 0 P S R e s e t

3126E Wiring Schmatic

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