SENR3912-04
May 1991
3176 Diesel Truck Engine
Electrical System
2YG3454-UP
©
1991 Caterpillar
All Rights Reserved
Printed in U.S.A.
MTR BAT
0.3A CURRENT LIMIT
5mA
5mA
5mA
5mA
5mA
5mA
TRANSDUCER
ECM
BOOST
RETURN
CYL COMMON 3&4
CYL COMMON 5&6
CYL NO. 1
CYL COMMON 1&2
CYL NO. 2
CYL NO. 3
CYL NO. 4
CYL NO. 5
CYL NO. 6
6800-BR
6817-GN
6818-PK
6801-YL
6802-GY
6803-WH
6804-PU
6805-OR
6806-BU
A
B
C
D
E
F
G
H
J
6800-BR
6817-GN
6818-PK
6801-YL
6802-GY
6803-WH
6804-PU
6805-OR
6806-BU
J5 P5
+V BOOST
1
2
3
4
5
31 22 34 2 23 3 33 32 13 24 40 28 30 20 10 39
6740-PU
6790-PK
6788-YL
6791-OR
6441-BR
6794-PK
6795-BU 6795-BU
6464-YL
6789-GY
6796-OR
37 27 35 38 29
+V TIMING
TIMING RETURN
SPEED/TIMING
+V COOLANT
COOLANT
+V FUEL PRESSURE
FUEL PRESSURE
+V OIL PRESS.
OIL PRESSURE
SENSOR RETURN ANLG
8 18 17 36 26 16 6 7 14 4 9 19 5 15 25
THROTTLE
VEHICAL SPEED
PARK BK SWITCH
CRUISE CONT ON/OFF
CLUTCH
RESUME/DCLR
SET/ACCEL
BRAKE SWITCH
RETARDER ENABLE
DIAGNOSTIC LAMP
ATA DATA LINK+
ATA DATA LINK-
WARNING BUZZER
SPARE SW IN 1
SPARE SW IN 2
6702-BR
6704-YL
6701-GN
6706-WH
6707-PU
6708-OR
6709-BU
6798-GY
6776-YL
6737-PU
6739-BU
6738-OR
6741-GY
6797-WH
6793-PU
-BATTERY
-BATTERY
+BATTERY
+BATTERY
12 21 1 11
6202-BK
6202-BK
6121-GN
6121-GN
CONTROL GROUP (3176)
CATERPILLAR
RESPONSIBILITY
OEM
RESPONSIBILITY
ECM GND STRAP
SENSOR
FUSE
ECM
FUSE
RELAY
(OPTIONAL)
BATTERY 1 BATTERY 2
10A15A
ALTERNATOR
GND
ENGINE
CYLINDER
HEAD
(GND STUD)
P7
J7
J8
P8
J4
P4
A E D B F G H J C C G J H F D E B A
J12
DASH DATA LINK
14 AWG 10FT MAX LENGTH
12 AWG 25FT MAX LENGTH
100 mA
100 mA
0.3A CURRENT LIMIT
5mA
40mA
40mA
J20
P20
A
B
C
F
D
H
J
E
G
CYL
NO.6
CYL
NO.5
CYL
NO.4
CYL
NO.3
CYL
NO.2
CYL
NO.1
P9 J9
OR 6740-PU
6790-PK
6788-YL
BK
WH
A
B
C
OR
BK
A
B
C
OR
A
B
C
J10 P10
P16 J16
GN
YL
GN
6791-OR
6789-GY
6794-PK
6789-GY
6795-BU
6441-BR
+V TIMING
TIMING RETURN
SPEED/TIMING
+V COOLANT
SENSOR
COOLANT RETURN
COOLANT
+V
PRESS. RETURN
FUEL PRESS.
SENSOR
SENSOR
SENSOR
SPEED/TIMING
COOLANT TEMP
FUEL PRESSURE
OIL PRESSURE
PRESS. RETURN
OIL PRESS.
NOTE B
SENSOR
THROTTLE POSITION
VEHICLE
SPEED BUFFER
OR
A
B
C
YL
GN
6789-GY
P17 J17
+ BATTERY
THROTTLE RETURN
THROTTLE
- BATTERY
OUT(SPEEDOMETER)(*)
OUT(ENGINE CONT)(*)
IN
IN
+ BATTERY
A
B
C
A
B
C
GN
P11 J11
P14 J14
RD
BK
WH
RD
BK
OR
BR
D
E
VEHICLE
SPEED
SENSOR
WH
WH
CATERPILLAR
RESPONSIBILITY
OEM
RESPONSIBILITY
A B C
DASH DATA LINK
(BRAKE APPLIED POSITION)
DIAGNOSTIC LAMP
WARNING BUZZER
SET/RESUME
(BRAKE APPLIED)
PARKING N/C
(PEDAL RELEASED POSITION)
(PEDAL RELEASED POSITION)
CRUISE ON/OFF
5mA
20mA
0.3A CURRENT LIMIT
SPEEDOMETER
(NOTE F)
CLUTCH N/C
BRAKE N/C
BAT.
SIGNAL
GND
NOTE D
NOTE C
NOTE H
GN
BR
RETARDER BRAKE
CONTROL MODULE
A DASHED OUTLINE SPECIFIES A COMPONENT
REQUIRED ONLY FOR OPTIONAL FEATURES
APPROPRIATE PERSONALITY MODULE REQUIRED
FOR OIL PRESSURE SENSOR OPERATION.
SPEEDOMETER SHOWN HAS INTERNAL SIGNAL (-)
AND GROUND CONNECTION. IF INTERNAL CONNECTION
IS NOT PRESENT. WIRE AS SHOWN BELOW
TO
VEHICLE SPEED
BUFFER
SPEEDOMETER
TO CYLINDER HEAD
GROUND STUD
BAT.
SIGNAL
GND
PIN C
PIN B
NOTE A:
NOTE B:
NOTE C:
NOTE E:
NOTE D:
SINGLE POINT GROUND CONNECTION AT SPEEDOMETER
REQUIRED FOR VEHICLE SPEED BUFFER AND
SPEEDOMETER
"SINGLE" WINDING MAGNETIC PICKUP SENSOR REQUIRED.
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
NOTE F:
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 G:
NOTE H:
NOTE G
SERIES
PAR. SW
+ 12V - - 12V +
1
5
2
4
3
6
STARTER
MOTOR
G
S
KEY SWITCH
S
C
R
B
ST
OFF
ON
+V
6464-YL
6796-OR
D66619
