C15 Engine

C15 Engine

CAT

Engine Wiring Diagrams

(MXS, NXS, RKS)

Version #3 | 9-09-19Revision #1 | 5-01-19

How to Read This Diagram

ABBREVIATION COLOR

RDWHOR

YL/YEPKBKGY

PU/VTBR/BN

GNBU/BL

REDWHITEORANGEYELLOWPINKBLACKGRAYPURPLEBROWNGREENBLUE

Capital Abbreviation’s Represent Wire Main ColorLower Case Abbreviation’s Represent Secondary Color

ABBREVIATION COLOR

RDWHOR

YL/YEPKBKGY

PU/VTBR/BN

GNBU/BL


Capital Abbreviation’s Represent Wire Main ColorLower Case Abbreviation’s Represent Secondary Color Part

Number

Component Name

Component

Component Connection

1

2

1

2

1

2

CRS Combustion Air Control Valve 298-6410

M67GA 18-OR

N67DA 18-GN

Circuit Number

GaugeColor

Part Number

Component Name

Component


1

2


M67GA 18-OR

N67DA 18-GN

Circuit Number

GaugeColor

A+12V Battery

B

C

D

Ignition

J1708(-)

J1708(+)

Trip Master (5927)

Connector Name

Pin Label

Pin Connection

A+12V Battery

B

C

D

Ignition

J1708(-)

J1708(+)

Trip Master (5927)

Connector Name

Pin Label

Pin Connection

A (See Page 1)

Reference

Reference Destination

A (See Page 1)

Reference


A+12V Battery

B

C

D

Ignition

J1708(-)

J1708(+)

Trip Master (5927)

Connector Name

Pin Label

Pin Connection

A (See Page 1)

Reference


SYMBOLS

Splice

Ground

Fuse

Twisted Pair

Diode

Passthrough Connector

Circuit Breaker

+++ Power

>>>>

A Reference

How to Read This Diagram

ABBREVIATION COLOR

RDWHOR

YL/YEPKBKGY

PU/VTBR/BN

GNBU/BL


Capital Abbreviation’s Represent Wire Main ColorLower Case Abbreviation’s Represent Secondary Color Part

Number

Component Name

Component


1

2


M67GA 18-OR

N67DA 18-GN

Circuit Number

GaugeColor

A+12V Battery

B

C

D

Ignition

J1708(-)

J1708(+)

Trip Master (5927)

Connector Name

Pin Label

Pin Connection

A (See Page 1)

Reference


SYMBOLS

Splice

Ground

Fuse

Twisted Pair

Diode

Passthrough Connector

Circuit Breaker

+ Power

>>

A Reference

Page 1 of 9

120 PIN ECM Connector

H807-A53 18-YE

T852-A32 18-GY

G826-A21 18-BN

G827-A50 18-BU

IVA OIL PRESSURE SENSOR +5V

IVA OIL SENSOR COMMON

Intake Valve Actuation Pressure Sensor(223-0099)

INTAKE VALVE ACTUATION OIL PRESSURE

Intake Valve Actuation Pressure Solenoid Valve (231-3269 (12V))

A

B

C

A

B

C

A

B

CT853-A11 18-OR

Intake Valve Actuation Pressure Solenoid Valve (236-9837 (24V))

1

2

1

2

1

2

1

2

INTAKE VALVE ACTUATOR OIL VALVE

G826-A21 18-BN

G827-A50 18-BUIntake Valve Actuation Pressure Sensor(224-4535)

T853-A11 18-OR

A

B

C

A

B

C

16-RD

16-RD

16-GN

16-GN

16-OR

16-YE

16-GN

Harness (243-1069)

G826-A21 18-BN

G827-A50 18-BUIntake Valve Actuation Pressure Sensor (248-2168)

1

2

3

1

2

3

1

2

3T853-A11 18-OR

Harness (248-4233)

A-S4 H807-A33 18-YECDV & IVA OIL VALVE RETURN

H807-A35 18-YE

T855-A34 18-BUEngine Coolant Diverter Solenoid Valve (240-7339 (12V))

Engine Coolant Diverter Solenoid Valve (240-6822 (24V))

1

2

1

2

1

2

1

2

COOLANT DIVERTER SOLENOID VALVE

16-RD

16-RD

16-GN

16-GN

80

54

74

3

79

5

Harness (243-1069)

CAT C15 On-Highway Engine

Page 2 of 9

G856-A8 18-WH

G857-A9 18-YE

G833-A46 18-PK

F421-A13 18-YE

G833-A45 18-PK

C967-A15 18-BU

G833-A44 18-PK

995-A12 18-BU1

2

1

2

1

2

Engine Coolant Temperature Sensor(234-5012)

A-S3 G833-A47 18-PK

1

2

1

2

1

2

Intake Manifold Air Temperature Sensor(234-5013)

1

2

1

2

1

2

Fuel Temperature Sensor(234-5013)

Timing Calibration (TC) Probe Connector

1

2

1

2

1

2

Harness (243-2321 & 248-4233) Only


13ENGINE COOLANT TEMPERATURE

30 TEMPERATURE SENSOR COMMON

56 INTAKE MANIFOLD AIR TEMPERATURE

62 FUEL TEMPERATURE

26TIMING CALIBRATION PROBE (+)

36 TIMING CALIBRATION PROBE (-)

G833-A44 18-PK

995-A12 18-BU1

2

1

2

1

2

Engine Coolant Temperature Sensor(130-9811)

Harness (243-1069)

G833-A45 18-PK

C967-A15 18-BU1

2

1

2

1

2

Intake Manifold Air Temperature Sensor(130-9811)

Harness (243-1069)

G833-A46 18-PK

F421-A13 18-YE1

2

1

2

1

2

Fuel Temperature Sensor(130-9811)

Harness (243-1069)

A-S3


Page 3 of 9

E964-A26 18-WH

E963-A27 18-BK

Primary Engine Speed/Timing Sensor(Crankshaft) (201-6615)

1

2

1

2

18-BK

18-WH

Harness (243-1069)

E964-A26 18-WH

E963-A27 18-BKPrimary Engine Speed/Timing Sensor(Crankshaft) (191-8303)

1

2

1

2

1

2

E966-A49 18-YE

E965-A48 18-BUSecondary Engine Speed/Timing Sensor(Camshaft) (201-6616)

1

2

1

2

18-BK

18-WH

18-OR

18-YE

18-GN R747-A6 18-GY

G829-A42 18-GN

G828-A40 18-WH

Atmospheric Pressure Sensor (194-6725)

A

B

C

A

B

C

Harness (243-1069)

994-A10 18-GY

G829-A43 18-GN

G828-A38 18-WH

Engine Oil Pressure Sensor (248-2167)

1

2

3

1

2

3

1

2

3

Harness (248-4233)


25 PRIMARY ENGINE SPEED/TIMING (-)

35 PRIMARY ENGINE SPEED/TIMING (+)

47 SECONDARY ENGINE SPEED/TIMING (-)

46 SECONDARY ENGINE SPEED/TIMING (+)

18-OR

18-YE

18-GN R746-A20 18-PK

G829-A41 18-GN

G828-A39 18-WH

Boost Pressure Sensor(239-3478)

A

B

C

A

B

C

Harness (243-1069)


Page 4 of 9


R746-A20 18-PK

G829-A41 18-GN

G828-A39 18-WH


AS-1 G828-A1 18-WH72 PRESSURE SENSOR SUPPLY

+5VAS-2 G829-A2 18-GN

17 PRESSURE SENSOR RETURN

15 BOOST PRESSURE SENSOR

R747-A6 18-GY

G829-A42 18-GN

G828-A40 18-WH


57 ATMOSPHERIC PRESSURE

18-OR

18-YE

18-GN R747-A6 18-GY

G829-A42 18-GN

G828-A40 18-WH


A

B

C

A

B

C

Harness (243-1069)

994-A10 18-GY

G829-A43 18-GN

G828-A38 18-WH

Engine Oil Pressure Sensor (249-0098)

28 ENGINE OIL PRESSURE SENSOR

R746-A20 18-PK

G829-A41 18-GN

G828-A39 18-WH


Harness (248-4233)

AS-1

AS-2

R747-A6 18-GY

G829-A42 18-GN

G828-A40 18-WH


Harness (248-4233)


A

B

C

A

B

C

A

B

C

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

Page 5 of 9

T859-J15 16-WH

T960-J4 16-BU

K737-B1 16-BN

T859-J16 16-WH

T959-J3 16-BN

X983-J7 16-BU

T858-J13 16-GY

T957-J1 16-VT

Injector (1)1

2

1

2

1

2

1

Front Valve Cover Connector

T957-A16 16-VT

T858-J5 16-GY5

T858-A23 16-GY

Intake Valve Actuator (1)X987-J20 16-BN

7X983-A7 16-BU

X987-J9 16-BN9

X987-A37 16-BN

X985-J8 16-OR

T858-J14 16-GY

T958-J2 16-YE

Injector (2)1

2

1

2

1

2

Intake Valve Actuator (2)X987-J19 16-BN

2T958-A17 16-YE

8X985-A14 16-OR

Injector (3)1

2

1

2

1

2

3T959-A18 16-BN

6T859-J6 16-WH T859-A24 16-WH

1

2

1

2

1

2

1 & 2 Retarder SolenoidA

BK739-B2 16-BU

K737-J10 16-BN10

K737-A54 16-BN K737-A4 16-BN

K739-J17 16-BU K739-J12 16-BU12

K739-A56 16-BU K739-A3 16-BU

K737-B1 16-BR1

2

1

2

1

2


BK739-B2 16-BU

K738-J11 16-GN11

K739-J18 16-BU

K738-A5 16-GN

Injector (4)1

2

1

2

1

2

4T960-A19 16-BU

116 INJECTOR 1 RETURN

104 INJECTOR 1 & 2 SUPPLY

111 INTAKE VALVE ACTUATOR 1 RETURN

77 INTAKE VALVE ACTUATOR 1 & 2





8 RETARDER SOLENOID MED/HI

14 RETARDER COMMON

1 RETARDER SOLENOID LOW/HI



J-S1

J-S3

J-S2

J-S4

A-S5

A-S6

A

B

A

B

A

B

A

B

A

B

A

B

A B

(See Page 6)(See Page 6)


Page 6 of 9

T860-E16 16-OR

X988-E15 16-VT

T860-E17 16-OR

X989-E13 16-OR

X986-E6 16-YE

Intake Valve Actuator (3)6

X986-A22 16-YE

X989-E10 16-OR10

X989-A51 16-OR

X989-E12 16-OR

X984-E7 16-BN

Intake Valve Actuator (4)7 X984-A30 16-BN

T961-E3 16-GN

Injector (5)1

2

1

2

1

2

3 T961-A28 16-GN

T860-E5 16-OR T860-A25 16-OR5

T856-E8 16-WH

Intake Valve Actuator (5)8 T856-A31 16-WH

X988-E11 16-VT11

X988-A52 16-VT

T962-E4 16-WH

Injector (6)1

2

1

2

1

2

4T962-A29 16-WH

X988-E14 16-VT

T857-E9 16-GN

Intake Valve Actuator (6)9 T857-A36 16-GN

K737-B1 16-BN


BK739-B2 16-BU

K737-E1 16-BN

K739-E2 16-BU

1K737-A55 16-BN

2K739-A57 16-BU

K739-A58 16-BU

386-A59 18-PK

To (+) Battery Unswitched

Air Inlet Shutoff Relay (N/O) (241-8371)Note H

1

2

1

2

Air Inlet Shutoff Solenoid(213-1626)

Ground

1

2

1

2

1

2

Manual Air Inlet Shutoff Switch

386-A60 18-PK

386-A61 PK

Harness 243-1069 OnlyHarness 243-1069 Only

To Battery

ONLY APPLIES TO ENGINES WITH AIR SHUTOFF OPTION.

6 AIR SHUTOFF










E-S2

A

B

A

B

A

B

A

B

A

B

A

B

A

B

A

B

A

B

E-S1

E-S3

A

B

A

B

A

B

A B1

2

1

2

1

2

RD-12 211-7888

Note H




85

86

87

30

85

86

87

30

Page 7 of 9

Typical Vehicle Chassis Wiring(See OEM vehicle schematic for more info)

Check Engine Lamp28

Warning Lamp

29

9-Pin CAB Connector

B

A

J

H

G

F

D

E

To + Battery +++

+

-

+

-

+

-

C

Speedometer Note B & E

Tachometer Note B & E

36

37

38

39

+ Battery

- Battery

J1587 -

J1587 +

J1939 Shield

J1939 -

J1939 +

Note Z

To Chassis J1939 Datalink

L994-YL

659-PK

C974-PU

C973-GN

450-YL

451-BR

E793-BU

E794-YL

A249-BK

K990-GN

K900-YL

9

8

42

34

50 J1939 DATA LINK POSITIVE

J1939 DATA LINK NEGATIVE

J1939 DATA LINK SHIELD

J1587 DATA LINK NEGATIVE

J1587 DATA LINK POSITIVE

TACHOMETER NEGATIVE

TACHOMETER POSITIVE

SPEEDOMETER NEGATIVE

SPEEDOMETER POSITIVE

CHECK ENGINE LAMP

WARNING LAMP

C

70-Pin Chassis Connector

Twisted Pairs

Note B: For Speedometers or tachometers with a single signal input terminal, either one of the two signal output lines from the ECM can be used. Leave the remaining line disconnected. Do not connect to ground.

Note E: The ECM speedometer and tachometer output signal line voltages are zero-crossing square waves. The speedometer signals at J1-37 and J1-36 are complements of each other. The tachometer signals at J1-38 and J1-39 are complements of each other. Maximum signal amplitude will be +/- 5 volts or greater if load current is less than 4mA.

Note Z: The connector on this schematic is black and connects directly to service tool cable 157-4829. The diagnostic connector not shown has +battery on pin (A) and – battery on pin (B). This connector is gray and connects to service tool cable 139-4166.

+

-

+

-


Note Z


Page 8 of 9



70J906-BR

101-RD

67

IGNITION KEY SWITCH

- BATTERY63

65

48 UNSWITCHED + BATTERY

52Battery 1 (12V)

Starter Motor

Key Switch

To Vehicle Components

229-BK

229-BK

229-BK

- BATTERY

- BATTERY

101-RD

101-RD

UNSWITCHED + BATTERY

53 UNSWITCHED + BATTERY

Circuits Within this Page are Recommendations

Starter Motor Solenoid

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

Battery 2 (12V)

Battery 3 (12V)

Alternator Ground

Engine Block

C

85

86

87

30

85

86

87

30

85

86

87

30

N/O Relay


Note D

Note D: These connections are unswitched, direct connection to the battery is not required.

10A10A

10A10A

10A10A


MMMM

Page 9 of 9


45

40

32

33

CLUTCH PEDAL POSITION SWITCH

RETARDER SOLENOID MED/HIGH SWITCH

SERVICE BRAKE PEDAL POSITION SWITCH

35 CRUISE CONTROL SET

25 CRUISE CONTROL RESUME

59CRUISE CONTROL ON/OFF SWITCH

23 RETARDER SOLENOID LOW/HIGH SWITCH

22

INPUT #1141

5

E971-GN

G808-BU

G809-GN

VEHICLE SPEED IN POSITIVE

VEHICLE SPEED IN NEGATIVE

H795-PK

C985-BU

G840-PU

AP SENSOR/SWITCH COMMON

4 +8V

66ACCELERATOR PEDAL POSITION

68 OUTPUT#8 (COOLING FAN)

C979-OR

C978-BR

C992-PU

C986-BR

C977-BU

E716-GY

E717-GN

C975-WH


Service Brake Pedal Position Switch N/C(Pedal Released Position)

H795-PK

Cruise Control On/Off Switch

Set/Resume Switch

H795-PK

Retarder Solenoid On/Off Switch

LO

MED

LO

HI

MED

HI

LO

MED

LO

HI

MED

HI

Clutch Pedal Switch N/C(Pedal Released Position)

A/C High Pressure Switch

H795-PK

H795-PK

+8VAccelerator Pedal Position Sensor

B

A

C

Accelerator Pedal Sensor/Switch Sensor Common

Accelerator Pedal Position

H795-PK

H795-PK

C985-BU

C986-BR

1

2

1

2

Passive Magnetic Vehicle Speed SensorNote C & F

1

2

G808-BU

G809-GN

Cooling Fan Solenoid

Note C:”Single” Winding magnetic pickup sensor recommended.

Note F:If an electronic signal is provided in place of a passive magnetic sensor, connect the electronic signal input to the +signal pin, the -signal pin should not be connected or grounded with electronic signal inputs.

Components within this Area are Caterpillar Provided/OEM Installed

Twisted Pair

BK

RD

WH


Connectors

ECM Connector

OEM Connector

In the interest of continuing product development, Diesel Laptops reserves the right to change specifications within this document at any time without prior notice. If you require additional reference materials or information, please contact Diesel Laptops.

WARNING: Diesel Laptops will not be held liable for any consequential or incidental damages including, but not limited to: Engine/vehicle downtime; loss of income or profits; damage potentially caused to other engines, vehicles, or property and any attorney fees. Diesel Laptops will not be responsible for any liability you may have in respect to yourself, another person, or entity. Diesel Laptops urges users to carefully follow all proper safety procedures before and during the application of this manual as a reference. Improper safety precautions can result in severe injury or death.

Diesel Laptops will not be held accountable for any inappropriate safety measures or faults made by the user while performing diagnostics.

www.DieselLaptops.comwww.DieselLaptops.com

http://www.diesellaptops.com

http://www.diesellaptops.com

Date post:	27-Feb-2023
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