3408e-3412e engine controls
TRANSCRIPT
3408E/3412E ENGINE CONTROLS
HYDRAULIC ELECTRONIC UNIT INJECTION(HEUI)
©2001 Caterpillar Inc.
PUMPCONTROL
VALVE
OILFILTER
OILCOOLER
HEUI
HEUI
OILSUMP
HYDRAULICPRESSURE
SENSOR
HYDRAULICTEMPERATURE
SENSORCOLD START
OILRESERVOIR OIL PRESSURE
SENSOR
HYDRAULICSUPPLY
PUMPGROUP
COOL DOWNCIRCUIT
FUEL TANK
FUELTEMPERATURE
SENSOR
PRESSUREREGULATING
VALVE
SECONDARYFUEL
FILTER
FUELTRANSFER
PUMP
PRIMARYFUEL FILTER
WATERSEPARATOR
LUBE OILPUMP
TO LUBESYSTEM
3408E/3412E HEUI FUEL SYSTEM
FLUID MANIFOLDHYDRAULIC PASSAGE
FLUID MANIFOLDHYDRAULIC PASSAGE
ECM
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
PUMP CONTROL VALVE
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
COOLANT FLOW SWITCH
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
INSTRUMENTPANEL
AUTO RETARDER CONTROL
EPTC II TRANSMISSION CONTROL
ELECTRONIC SERVICE TOOL
CAT DATA LINK
FAN
FAN SPEED SENSOR
FAN CONTROL VALVE
TURBO INLET PRESSURE SENSOR
THROTTLE BACK-UP, ELEVATED LOW IDLE ENABLE,AND GROUND LEVEL SHUTDOWN (2) SWITCHES
THROTTLESENSOR
ACCELERATORPEDAL
DISCONNECT SWITCH
3408E/3412E HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
ELECTRONIC CONTROL SYSTEM
HEUI CONTROL LOGIC
ENGINE SPEED
FUEL QUANTITY FUEL RPM
COLD MODE
SELECTTIMING
CONVERTDESIREDTIMING
HYDRAULIC OILTEMPERATURE
TIMING CONTROL
DEGREES BTDC DESIREDTIMINGBTDC
TIMING
FUEL INJECTIONTIMING WAVE FORM
ELECTRONICGOVERNOR
TORQUEMAPS
FRCMAPS
TURBO OUTLET ANDATMOSPHERIC
PRESSURE SENSORS
ENGINECONTROL
LOGIC
THROTTLE
SHUTDOWNS
INJECTIONACTUATIONCONTROL
ENGINE RPM
TDC
87654321
FUELINJECTIONCONTROL
TO PUMPCONTROL VALVE
SIGNALSTO FUEL
INJECTORS
SPEED/TIMINGSIGNAL
ENGINE RPM
SPEED/TIMINGSENSORS
TIMINGWHEEL
ENGINE RPM
ECM
HYDRAULIC OILTEMPERATURE ANDPRESSURE SENSORS
3408E/3412E ELECTRONIC GOVERNOR
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
PUMP CONTROL VALVE
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
COOLANT FLOW SWITCH
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
INSTRUMENTPANEL
AUTO RETARDER CONTROL
EPTC II TRANSMISSION CONTROL
ELECTRONIC SERVICE TOOL
CAT DATA LINK
FANFAN SPEED SENSOR
PROPORTIONAL VALVE
TURBO INLET PRESSURE SENSOR
THROTTLESENSOR
ACCELERATORPEDAL
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
393229381812
732-PK996-GN998-BR999-WHF723-PKF724-PU
SECONDARY ENGINE SPEED+V TIMINGDIGITAL RETURNPRIMARY ENGINE SPEEDTIMING CAL +TIMING CAL -
ECM(3408E/3412 E)
P2 J2
ABC
ORBKWH
SECONDARYSPEED/TIMING
SENSOR
ABC
ORBKWH
PRIMARYSPEED/TIMING
SENSOR
TIMING CALIBRATIONCONNECTOR
12
SPEED/TIMING SENSORS
P44 J44
P20 J20
P26 P1 J1
4
3
6
5
7
2
1
8
REF
REF
REF
REF
REF
REF
REF
REF
TDCTDC
TDC
TDCTDC
TDC
TDC
SINGLE50/50 TOOTH
TIMING WHEELROTATION
TDC CYLINDER No. 1
TIMINGCALIBRATIONRANGE ± 10°
PRIMARYSPEED/TIMING
SENSOR
SECONDARYSPEED/TIMING
SENSOR
TIMING WHEEL
A B C D E F G H
TIMING WHEEL ROTATION
80/20 % 80/20 % 80/20 %80/20 % 50/50%80/20 % 80/20 %
TIMING GEAR TOOTH TABLETABLEENTRY
CYLINDERREFERENCE
ABCDEFGH
80 %80 %80 %80 %80 %80 %80 %50 %
NONE IDENTIFIED
PWM DUTYCYCLE
CRANKING
TIMING GEAR TOOTH TABLE
PWM DUTYCYCLE
CYLINDERREFERENCE
80 %80 %80 %80 %80 %80 %80 %50 %
AFTER PATTERNRECOGNITIONNO
CYL NO. 3NONOCYL NO. 4NONOCYL NO. 8
TABLEENTRY
TIMING WHEEL ROTATION
ABCDEFGH
A B C D E F G H
CYL NO. 3REFERENCE
EDGE
CYL NO. 3TDC
CYL NO. 4REFERENCE
EDGE
CYL NO. 4TDC
CYL NO. 8REFERENCE
EDGE
TIMING GEAR TOOTH TABLE
PWM DUTYCYCLE
CYLINDERREFERENCE
80 %80 %80 %80 %80 %80 %80 %50 %
NORMAL OPERATIONNOCYL NO. 3NONOCYL NO. 4NONOCYL NO. 8
CYL NO. 4(REFERENCE)
CYL NO. 4ACTUAL TDC
(CALIBRATED)
62° BTDC (EEPROM)
DES TIMING
NO. 4INJECTION
TABLEENTRY
TIMING WHEEL ROTATION
ABCDEFGH
A B C D E F G H
CYL NO. 3(REFERENCE)
CYL NO. 3ACTUAL TDC
(CALIBRATED)
62° BTDC (EEPROM)
DES TIMING
DELAY NO. 3INJECTION
DELAY
ASSUMEDTDC
ASSUMEDTDC
393229381812
732-PK996-GN998-BR999-WHF723-PKF724-PU
SECONDARY ENGINE SPEED+V TIMINGDIGITAL RETURNPRIMARY ENGINE SPEEDTIMING CAL +TIMING CAL -
ECM(3408E/3412E)
P2 J2
ABC
ORBKWH
SECONDARYSPEED/TIMING
SENSOR
ABC
ORBKWH
PRIMARYSPEED/TIMING
SENSOR
TIMING CALIBRATIONCONNECTOR
P26TIMING CALIBRATION
SENSOR
P44 J44
P20 J20
P1 J1
12
TIMING CALIBRATION SENSOR
REFERENCE EDGE TO TDC DISTANCE
REFERENCEEDGE ASSUMED
CYL. NO. 1 TDCACTUAL
CYL. NO. 1 TDC
TIMINGREFERENCE
OFFSET
MAXIMUM TIMING REFERENCE OFFSET ± 10 DEGREES
TIMING CALIBRATIONSENSOR SIGNAL
TIMINGWHEEL
+10°± 10°
-10°
TIMING CALIBRATION
INJECTION CURRENT WAVEFORM
0 1 2 3 4
CU
RR
EN
T F
LO
W
TIME (MILLISECONDS)
PULL-IN PEAK CURRENT
HOLD-IN PEAK CURRENT
ONE CYCLE
5
POPPET VALVE MOVEMENT
0 1 2 3 4
CU
RR
EN
T F
LO
W
TIME (MILLISECONDS)
CURRENT
POPPETLIFT
5
WAVEFORM AND RESPONSE CHARACTERISTICS
0 1 2 3 4
CU
RR
EN
T F
LO
W
TIME (MILLISECONDS)
CURRENT
POPPETLIFT
INJECTIONRATE
START OFINJECTION
DURATION
5END OF
INJECTION
FUEL SYSTEM LIMITS
• Maximum Horsepower• Maximum Torque• Fuel Ratio
• Cranking Fuel• Cold Mode Limit
FUEL SYSTEM COLD MODES
• Speed Control• Fuel Limiting• Injection Timing• Injection Actuation Pressure• Ether Injection
FUEL SYSTEM DERATES
• Automatic Altitude Compensation
• Automatic Filter Compensation
• Engine Warning Derate
FUEL INJECTION SYSTEM
PUMPCONTROL
VALVE
OILFILTER
OILCOOLER
HEUI
HEUI
OILSUMP
HYDRAULICPRESSURE
SENSOR
HYDRAULICTEMPERATURE
SENSORCOLD START
OILRESERVOIR OIL PRESSURE
SENSOR
HYDRAULICSUPPLY
PUMPGROUP
COOL DOWNCIRCUIT
FUEL TANK
FUELTEMPERATURE
SENSOR
PRESSUREREGULATING
VALVE
SECONDARYFUEL
FILTER
FUELTRANSFER
PUMP
PRIMARYFUEL FILTER
WATERSEPARATOR
LUBE OILPUMP
TO LUBESYSTEM
3408E/3412E HEUI FUEL SYSTEM
FLUID MANIFOLDHYDRAULIC PASSAGE
FLUID MANIFOLDHYDRAULIC PASSAGE
ECM
TO LUBESYSTEM
FUELTRANSFER
PUMP
PUMPCONTROL
VALVE
OILFILTER
3408E/3412E HEUI FUEL SYSTEM
OILCOOLER
HEUI
HEUI
OILSUMP
HYDRAULICPRESSURE
SENSOR
HYDRAULICTEMPERATURE
SENSOR
OIL PRESSURESENSOR
ECM
COOL DOWNCIRCUIT
LOW PRESSURE HYDRAULICS
FUEL TANK
FUELTEMPERATURE
SENSOR
PRESSUREREGULATING
VALVE
SECONDARYFUEL
FILTERPRIMARY
FUEL FILTERWATER
SEPARATOR
LUBE OILPUMP
COLD STARTOIL
RESERVOIR
HYDRAULICSUPPLY
PUMPGROUP
FLUID MANIFOLDHYDRAULIC PASSAGE
FLUID MANIFOLDHYDRAULIC PASSAGE
TO LUBESYSTEM
FUELTRANSFER
PUMP
PUMPCONTROL
VALVE
OILFILTER
3408E/3412E HEUI FUEL SYSTEM
OILCOOLER
HEUI
HEUI
OILSUMP
HYDRAULICPRESSURE
SENSOR
HYDRAULICTEMPERATURE
SENSOR
OIL PRESSURESENSOR
ECM
COOL DOWNCIRCUIT
HIGH PRESSURE HYDRAULICS
FUEL TANK
FUELTEMPERATURE
SENSOR
PRESSUREREGULATING
VALVE
SECONDARYFUEL
FILTERPRIMARY
FUEL FILTERWATER
SEPARATOR
LUBE OILPUMP
COLD STARTOIL
RESERVOIR
HYDRAULICSUPPLY
PUMPGROUP
FLUID MANIFOLDHYDRAULIC PASSAGE
FLUID MANIFOLDHYDRAULIC PASSAGE
TO LUBESYSTEM
FUELTRANSFER
PUMP
PUMPCONTROL
VALVE
OILFILTER
3408E/3412E HEUI FUEL SYSTEM
OILCOOLER
HEUI
HEUI
OILSUMP
HYDRAULICPRESSURE
SENSOR
HYDRAULICTEMPERATURE
SENSOR
OIL PRESSURESENSOR
ECM
COOL DOWNCIRCUIT
LOW PRESSURE FUEL SUPPLY
FUEL TANK
FUELTEMPERATURE
SENSOR
PRESSUREREGULATING
VALVE
SECONDARYFUEL
FILTER
PRIMARYFUEL FILTER
WATERSEPARATOR
LUBE OILPUMP
COLD STARTOIL
RESERVOIR
HYDRAULICSUPPLYPUMP
GROUP
FLUID MANIFOLDHYDRAULIC PASSAGE
FLUID MANIFOLDHYDRAULIC PASSAGE
LOW PRESSUREFUEL SUPPLY
CYLINDER HEADINJECTOR SLEEVE
FLUID SUPPLYMANIFOLD
INJECTOR
INJECTOR OILADAPTER
JUMPER TUBE
INJECTOR CLAMP
HIGH PRESSUREHYDRAULIC PASSAGE
CYLINDER HEAD
ROCKER ARM BASE
LUBE OIL PASSAGE
CYLINDER BLOCKCOOLANT
METAL WASHER
HIGH PRESSUREHYDRAULIC OIL
INJECTOR FLUID FLOW
FLUID SUPPLYMANIFOLD
INJECTOR
CYLINDERHEAD
LOWER INJECTORO-RING SEAL
UPPER INJECTORO-RING SEAL
METAL-TO- METALCONTACT
LOW PRESSUREFUEL SUPPLY
CYLINDER HEADINJECTOR SLEEVE
UPPER SLEEVEO-RING SEAL
LOWER SLEEVEO-RING SEAL
INJECTOR FUEL SUPPLY
LOW PRESSUREFUEL SUPPLY PASSAGE
CYLINDER HEADINJECTOR SLEEVE
HIGH PRESSUREHYDRAULIC PASSAGE
ROCKER ARMBASE
LUBRICATION OILPASSAGE
EXTRACTORSPLINES
FUEL SEALS
FLUID SUPPLY MANIFOLD
INJECTION CURRENT WAVEFORMONE CYCLE
0 1 2 3 4
CU
RR
EN
T F
LO
W
TIME (MILLISECONDS)
HOLD-IN PEAK CURRENT
5
PULL-IN PEAK CURRENT
WAVEFORM AND RESPONSE CHARACTERISTICS
0 1 2 3 4
CU
RR
EN
T F
LO
W
TIME (MILLISECONDS)
CURRENT
POPPETLIFT
INJECTIONRATE
START OFINJECTION
DURATION
5END OF
INJECTION
HEUI UNIT INJECTOR3 MAIN GROUPS
VALVE BODYGROUP
BARREL GROUP
NOZZLE GROUP
STOPPINPLUNGER SPRING SEAL BARREL BALL
DOWEL
SEAL
INTENSIFIER PISTON
RETAINER RING
WASHER
STOPPLATE
CHECKPLATE
BALL
STOP
DOWEL
SPRING
LIFTSPACER
SLEEVE
DOWEL
CHECK
TIP CASE
POPPET SPRING SLEEVE SHIM SEAL
ADAPTER BOLT
SPACER
ARMATURE
SCREW
SOLENOIDASSEMBLY
SCREW
BODYVALVE BODY GROUP
BARREL GROUP
NOZZLE GROUP
3408E/3412E HEUI INJECTORCOMPONENTS
SHIMBARREL
PISTON
VALVE
FUEL INLETCHECK VALVE
PIN
SPACER
ADAPTER
SPACER
ARMATURE
SOLENOID
WASHER
PLUNGER
SLEEVE
SLEEVE
UNIT INJECTOR COMPONENTS
LOWER FUEL SEAL
VALVE BODY
UPPER FUEL SEAL
NOZZLE
CHECK
HORIZONTAL BOLTS
JUMPER TUBE
INJECTOR CLAMP
VERTICAL BOLTS
ALLEN SCREWS
INJECTOR OILADAPTOR
INJECTOR INSTALLATION
SOLENOID DE-ENERGIZED SOLENOID ENERGIZEDPOPPET VALVE CLOSED POPPET VALVE OPEN
ARMATURESCREWPOPPET
SPRINGINLET
VALVE SEAT
SOLENOID
POPPET VALVE
ARMATURE
EXHAUSTVALVE SEAT
VALVE BODY GROUP
FUEL INLETCHECK VALVE
INTENSIFIERPISTON
PLUNGER
FUEL TONOZZLE
BARREL
BARREL GROUPFUEL PRESSURE INCREASE
REVERSE FLOWCHECK VALVE
FUEL FROMTRANSFER PUMP
SUPPLY OIL
VIEW OF STOP PLATE AND REVERSE FLOW CHECK VALVE
REVERSE FLOWCHECK VALVE
FUEL ATOMIZATION
NOZZLE GROUP
CHECK VALVE
INLETVALVE SEAT
SOLENOID
POPPET VALVE
ARMATURE
EXHAUSTVALVE SEAT
SOLENOID DE-ENERGIZEDVALVE BODY GROUP
SHIM
BARREL
PISTON
VALVE
BALL
PIN
SPACER
ADAPTER
SPACER
ARMATURE
SOLENOID
WASHER
PLUNGER
SLEEVE
SLEEVE
NOZZLE
BODY
UNIT INJECTOREND OF INJECTION
CHECK
BARREL GROUPREFILLING THE BARREL
BARREL
PISTON
FUEL INLETCHECK VALVE
PIN
SPACER
WASHER
PLUNGER
SLEEVE
NOZZLENOZZLE CHECK
VALVE
FUEL EDGEFILTER
REVERSE FLOWCHECK VALVE
EDGE FILTER
EDGE FILTER
FUEL INLETCHECK VALVE
FUEL INLET FUEL INLET
PRIME INJECTION RATE SHAPING
0 1 2 3 4TIME (MILLISECONDS)
5
PRIME = PRE-INJECTION METERING INJECTION RATE
DURATIONSTART OF INJECTION
CROSS SECTIONOF PLUNGER
PRIME RATESHAPING PASSAGE
PLUNGER
BARREL
SPILLPORT
FUEL TONOZZLE GROUP
START OF INJECTION PRESSURE DROPFINAL
PRESSURE INCREASE
OIL FLOW
BARREL GROUPPRIME RATE SHAPING
BARREL GROUPVENTING INTERNAL LEAKS
INTENSIFIERPISTON SEAL
BARREL
INTENSIFIERPISTON
VENTINGCHECK VALVE
BARREL GROUP NOZZLE GROUPFUEL INLETCHECK VALVE
NOZZLECHECK VALVE
FUELATOMIZATION
VENTINGCHECK VALVE
REVERSE FLOWCHECK VALVE
INJECTOR CHECK VALVES
IDLE PEAK TORQUE RATED
INJE
CT
ION
PR
ES
SU
RE
MECHANICALLY ACTUATEDFUEL SYSTEM
HEUI
ENGINE SPEED
HYDRAULIC INJECTION PRESSURE CONTROL
PRIMING PORT
ORIFICE
RESERVOIR
SWASHPLATE
TRANSFER PUMP
COMPENSATORVALVE
HEUI PUMP
VALVE BASE
DRAIN PASSAGE
TO LUBESYSTEM
FUELTRANSFER
PUMP
PUMPCONTROL
VALVE
OILFILTER
COOL DOWN BYPASS CIRCUIT
OILCOOLER
HEUI
HEUI
OILSUMP
HYDRAULICPRESSURE
SENSOR
HYDRAULICTEMPERATURE
SENSOR
OIL PRESSURESENSOR
ECM
COOL DOWNCIRCUIT
FUEL TANK
FUELTEMPERATURE
SENSOR
PRESSUREREGULATING
VALVE
SECONDARYFUEL
FILTERPRIMARY
FUEL FILTERWATER
SEPARATOR
LUBE OILPUMP
COLD STARTOIL
RESERVOIR
HYDRAULICSUPPLY
PUMPGROUP
FLUID MANIFOLDHYDRAULIC PASSAGE
FLUID MANIFOLDHYDRAULIC PASSAGE
CHECKFITTING SPRINGVALVE BLOCK SEAT
REVERSE FLOW CHECK VALVE
FROMPUMP
TOINJECTORS
SEAT(END VIEW)
TO LUBESYSTEM
FUELTRANSFER
PUMP
PUMPCONTROL
VALVE
OILFILTER
3408E/3412E HEUI FUEL SYSTEM
OILCOOLER
HEUI
HEUI
OILSUMP
HYDRAULICPRESSURE
SENSOR
HYDRAULICTEMPERATURE
SENSOR
OIL PRESSURESENSOR
ECM
COOL DOWNCIRCUIT
HYDRAULIC SYSTEM OPERATION
FUEL TANK
FUELTEMPERATURE
SENSOR
PRESSUREREGULATING
VALVE
SECONDARYFUEL
FILTERPRIMARY
FUEL FILTERWATER
SEPARATOR
LUBE OILPUMP
COLD STARTOIL
RESERVOIR
HYDRAULICSUPPLY
PUMPGROUP
FLUID MANIFOLDHYDRAULIC PASSAGE
FLUID MANIFOLDHYDRAULIC PASSAGE
TO LUBESYSTEM
TO RIGHT OILMANIFOLD
TO LEFT OILMANIFOLD
COLD STARTRESERVOIR
OIL SUMPPUMP
CONTROLVALVE
LOADSENSINGSPOOL
PRESSURELIMITERSPOOL
PUMPCASE DRAIN
SOLENOID(ENERGIZED)
DISPLACEMENTCONTROL PISTON
HEUI HYDRAULIC CONTROL SYSTEMSTART-UP
CHECK VALVE
PRESSURE LIMITER SPOOL
CHECK VALVE
PUMP CONTROLVALVE
DRAIN ORIFICE
ORIFICE
TOCASEDRAIN
LOAD SENSING SPOOL
FROM DISPLACEMENTCONTROL PISTON
REVERSE FLOWCHECK VALVES
TO CASE DRAIN
START-UPCOMPENSATOR ASSEMBLY
TO LUBESYSTEM
TO RIGHT OILMANIFOLD
TO LEFT OILMANIFOLD
COLD STARTRESERVOIR
OIL SUMPPUMP
CONTROLVALVE
LOADSENSINGSPOOL
PRESSURELIMITERSPOOL
PUMPCASE DRAIN
SOLENOID(DE-ENERGIZED)
HEUI HYDRAULIC CONTROL SYSTEMDESTROKE
CHECK VALVE
DISPLACEMENTCONTROL PISTON
SUPPLY PUMP
PUMPCONTROL VALVE
DRAIN ORIFICE
TO DISPLACEMENT CONTROL PISTON
TO CASE DRAIN
PRESSURELIMITER SPOOL
CHECK VALVE
ORIFICE
LOAD SENSINGSPOOL
DESTROKECOMPENSATOR ASSEMBLY
TO LUBESYSTEM
TO RIGHT OILMANIFOLD
TO LEFT OILMANIFOLD
COLD STARTRESERVOIR
OIL SUMPPUMP
CONTROLVALVE
LOADSENSINGSPOOL
PRESSURELIMITERSPOOL
PUMPCASE DRAIN
SOLENOID(ENERGIZED)
HEUI HYDRAULIC CONTROL SYSTEMUPSTROKE
CHECK VALVE
DISPLACEMENTCONTROL PISTON
SUPPLY PUMP
PRESSURELIMITER SPOOL
CHECK VALVE
ORIFICE
LOAD SENSINGSPOOL
PUMPCONTROL VALVE
DRAIN ORIFICE
FROMDISPLACEMENT
CONTROL PISTON
TO CASE DRAIN
UPSTROKECOMPENSATOR ASSEMBLY
TO LUBESYSTEM
TO RIGHT OILMANIFOLD
TO LEFT OILMANIFOLD
COLD STARTRESERVOIR
OIL SUMPPUMP
CONTROLVALVE
LOADSENSINGSPOOL
PRESSURELIMITERSPOOL
PUMPCASE DRAIN
SOLENOID(DE-ENERGIZED)
HEUI HYDRAULIC CONTROL SYSTEMPRESSURE LIMITER OPERATION
DISPLACEMENTCONTROL PISTON
SUPPLY PUMP
PLUGGEDORIFICE
PRESSURE LIMITERSPOOL
CHECK VALVE
ORIFICE
LOAD SENSINGSPOOL
PUMPCONTROL VALVE
DRAIN ORIFICE
TODISPLACEMENT
CONTROL PISTON
TO CASE DRAIN
RESTRICTION
PRESSURE LIMITER OPERATIONCOMPENSATOR ASSEMBLY
ADAPTER CAGE
RINGSHELLPIN
STATOR
SEAL SEATPOPPETVALVE
SOLENOIDARMATURE
STOP
TOCASE DRAIN
FROM LOADSENSING SPOOL
VALVE
COILASSEMBLY
EDGEFILTER
SPRINGRETAINER
VALVEBLOCK
NO CURRENT FLOWPUMP CONTROL VALVE
ADAPTER CAGE
RINGSHELLPIN
STATOR
SEAL SEATPOPPETVALVE
SOLENOIDARMATURE
STOP
COILASSEMBLY
EDGEFILTER
SPRINGRETAINER
FROM LOADSENSING SPOOL
VALVE
VALVEBLOCK
TOCASE DRAIN
HIGH CURRENT FLOWPUMP CONTROL VALVE
HEUI SYSTEM POWER SUPPLIES
• ECM: 24 VOLTS
• INJECTORS: 105 VOLTS
• ANALOG SENSORS: 5 VOLTS
• SPEED/TIMING SENSORS: 12.5 VOLTS
• DIGITAL SENSORS: 8 VOLTS
• PUMP CONTROL VALVE: 0 to 24 VOLTS
ADEM IIELECTRONIC
CONTROLMODULE
(ECM)GROUND
BOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
PUMPCONTROL VALVE
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
COOLANT FLOW SWITCH
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
INSTRUMENTPANEL
AUTO RETARDER CONTROL
EPTC II TRANSMISSION CONTROL
ELECTRONIC SERVICE TOOL
CAT DATA LINK
FAN
FAN SPEED SENSOR
FAN CONTROL VALVE
TURBO INLET PRESSURE SENSOR
THROTTLE BACK-UP, ELEVATED LOW IDLE ENABLE,AND GROUND LEVEL SHUTDOWN (2) SWITCHES
THROTTLESENSOR
ACCELERATORPEDAL
DISCONNECT SWITCH
3408E/3412E HEUI SYSTEMECM POWER SUPPLY COMPONENTS
MACHINEHARNESS
0511040623
ECM(3408E/3412E)(-) BATTERY(-) BATTERY(+) BATTERY(+) BATTERYKEY SWITCH ON
229-BK-14229-BK-14150-RD-14150-RD-14113-OR
12
26
24 VOLTS DC
(+)
(-)
ENGINE BLOCKGROUND BOLT
CIRCUIT BREAKER
BATTERY
R
CSB ST
OFFON
308-YL
200-BK
105-RD
KEY SWITCH
112-PU
117-RD
113-OR
15 A
10 AMPP3 J3
P1 J1
DISCONNECTSWITCH
ECM POWER SUPPLY CIRCUIT
393229381812
732-PK996-GN998-BR999-WHF723-PKF724-PU
SECONDARY ENGINE SPEED+V TIMINGDIGITAL RETURNPRIMARY ENGINE SPEEDTIMING CAL +TIMING CAL -
ECM(3408E/3412 E)
P2 J2
ABC
ORBKWH
SECONDARYSPEED/TIMINGSENSOR (LH)
ABC
ORBKWH
PRIMARYSPEED/TIMINGSENSOR (RH)
SPEED/TIMING SENSOR POWER SUPPLY12.5 ± 1 VOLTS
P44 J44
P20 J20
P1 J1
160526
A701-GYF726-YLA703-BRF726-YL
P2 J2
INJECTOR WIRING SCHEMATIC
SOLENOID 1 POWERSOLENOID 1/3 RETURNSOLENOID 3 POWER
ECM(3408/3412E)
401134
A702-PUF727-BUA704-GNF727-BU
SOLENOID 2 POWERSOLENOID 2/4 RETURNSOLENOID 4 POWER
321738
A705-BUF728-BRA707-PUF728-BR
SOLENOID 5 POWERSOLENOID 5/7 RETURNSOLENOID 7 POWER
282122
A706-GYF729-GNA708-BRF729-GN
SOLENOID 6 POWERSOLENOID 6/8 RETURNSOLENOID 8 POWER
372731
A709-ORF730-GYA711-PUF730-GY
SOLENOID 9 POWERSOLENOID 9/11 RETURNSOLENOID 11 POWER
183312
A710-GYF731-ORA712-BRF731-OR
SOLENOID 10 POWERSOLENOID 10/12 RETURNSOLENOID 12 POWER
1234
SOLENOID 1
SOLENOID 3
J52/P52
1234
SOLENOID 2
SOLENOID 4
J56/P56
1234
SOLENOID 5
SOLENOID 7
J53/P53
1234
SOLENOID 6
SOLENOID 8
J57/P57
1234
SOLENOID 9
SOLENOID 11
J54/P54
1234
SOLENOID 10
SOLENOID 12
J58/P58
P22 J22
ENGINE COOLANTTEMPERATURE SENSOR
ENGINE OILPRESSURE SENSOR
+V ANALOGANALOG RETURNSIGNAL
+V ANALOGANALOG RETURNSIGNAL
P23 J23
TURBO OUTLETPRESSURE SENSOR
+V ANALOGANALOG RETURNSIGNAL
P25 J25
TURBO INLET PRESSURE SENSOR
+V ANALOGANALOG RETURNSIGNAL
P27 J27
ATMOSPHERICPRESSURE SENSOR
+V ANALOGANALOG RETURNSIGNAL
P45 J45
HYDRAULICPRESSURE SENSOR
+V ANALOGANALOG RETURNSIGNAL
3630
ANALOG SENSORPOWER SUPPLY
P1 J1
P43 J43+V ANALOGANALOG RETURNSIGNAL
FUEL TEMPERATURE SENSOR
P51 J51
+V ANALOGANALOG RETURNSIGNAL
HYDRAULIC OILTEMPERATURE SENSOR
ABC
ABC
ABC
ABC
ABC
ABC
ABC
ABC
J21 P21
5 ± 0.2 VOLTS
ECM (3408E/3412E HEUI)+V ANALOG SUPPLYANALOG RETURN
ECM (3408E/3412E HEUI)+ V DIGITAL SUPPLY- V DIGITAL RETURN
2935
DIGITAL SENSORPOWER SUPPLY
P1 J1
ABC
J35 P35
ABC
P84 J84+V DIGITAL
DIGITAL RETURNSIGNAL
FAN SPEED SENSOR
THROTTLEPOSITION SENSOR
+V DIGITALDIGITAL RETURN
SIGNAL
8 ± 0.5 VOLTS
ECM (3408E/3412E HEUI)+ SUPPLY- RETURN
2935
P2 J2
AB
J46 P46
PUMP CONTROLVALVE
SUPPLY RETURN
PUMP CONTROL VALVEPOWER SUPPLY0 to 24 VOLTS PWM
0 to 800 mAmps
ELECTRONIC SENSORSAND
SYSTEMS
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
ANALOG SENSORS
• Fuel temperature
• Hydraulic temperature
• Lubrication oil pressure
• Turbocharger outlet pressure
• Turbocharger inlet pressure
• Atmospheric pressure
• Coolant temperature
• Hydraulic pressure
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
COOLANT TEMP. SENSOR
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
100%
98%
96%
94%
92%
90%
88%
86%
84%
82%
80%
78%
76%
74%
77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53
8,210
8,920
9,630
10,340
11,050
11,760
12,470
13,890
14,600
15,310
16,020
16,730
17,440
13,180
7,500
72%
ENGINE POWER DERATING MAPACCORDING TO ATMOSPHERIC PRESSURE
ATMOSPHERIC PRESSURE IN kPa
PE
RC
EN
T O
F F
UL
L L
OA
D P
OW
ER
AL
TIT
UD
E IN
FE
ET
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
TURBO INLET PRESSURE SENSOR
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
CAT
AUTOMATIC AIR FILTER COMPENSATION
TURBOCHARGERINLET PRESSURE
SENSOR
ATMOSPHERICPRESSURE
SENSOR
Filter differential pressure calculated with formula:
Atmospheric sensor pressure - Turbo sensor pressure = ∆P
Fuel limited 2% per 4 inches H20 to max 20%
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
TURBO INLET PRESSURE SENSOR
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
TURBO INLET PRESSURE SENSOR
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
OIL
PR
ES
SU
RE
IN k
Pa
600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 180060
80
100
120
140
160
180
200
220
240
260
280
300
ENGINE RPM
OIL PRESSURE MAP
1900
320
340
8.7
11.6
14.5
17.4
20.3
23.2
26.1
29
31.9
34.8
37.7
40.6
43.5
46.4
49.3
OIL
PR
ES
SU
RE
IN P
SI
kPa x 0.145 = PSI
2000
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET (BOOST) PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULIC OILPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC OIL TEMP. SENSOR
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
TURBO INLET PRESSURE SENSOR
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
TURBO INLET PRESSURE SENSOR
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
COOLANT FLOW SWITCH
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
TURBO INLET PRESSURE SENSOR
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
a
• Throttle Position
• Pump Control Valve Signal
• Exhaust Temperature
DIGITAL SENSORS AND CIRCUITS
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
COOLANT FLOW SWITCH
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
TURBO INLET PRESSURE SENSOR
THROTTLESENSOR
ACCELERATORPEDAL
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
90%
ON
OFF
ON
OFF
ON
OFF
10%
50%
DUTYCYCLE
DUTY CYCLE = PERCENT OF TIME ON VS PERCENT OF TIME OFF
1 CYCLE
= 90%
DUTYCYCLE
= 50%
DUTYCYCLE
= 10%
PULSE WIDTH MODULATED SIGNALS
ADEM IIELECTRONIC
CONTROLMODULE
(ECM)GROUND
BOLT
15 AMPBREAKER
MAINPOWER RELAY KEY
SWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
PUMP CONTROL VALVE
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
COOLANT FLOW SWITCH
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
TURBO INLET PRESSURE SENSOR
THROTTLESENSOR
ACCELERATORPEDAL
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
PUMP CONTROL VALVE
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
COOLANT FLOW SWITCH
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
TURBO INLET PRESSURE SENSOR
THROTTLE BACK-UP, ELEVATED LOW IDLE ENABLE,AND GROUND LEVEL SHUTDOWN (2) SWITCHES
THROTTLESENSOR
ACCELERATORPEDAL
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
ECM (3408E/3412E HEUI)USER SHUTDOWN1
P2 J2
USER DEFINED SHUTDOWN
12
J3
USER SHUTDOWNDEVICE
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
PUMP CONTROL VALVE
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
COOLANT FLOW SWITCH
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
FANFAN SPEED SENSOR
FAN CONTROL VALVE
TURBO INLET PRESSURE SENSOR
THROTTLE BACK-UP, ELEVATED LOW IDLE ENABLE,AND GROUND LEVEL SHUTDOWN (2) SWITCHES
THROTTLESENSOR
ACCELERATORPEDAL
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
28291940
ECM(3408E/E3412E)
ETHER SWITCH
308-YL
200-BK
P1 J1
ETHER INJECTION SYSTEM
ETHER SW LAMPDIGITAL RETURNETHER REQUESTETHER CONTROL
P2 J2
F708-YL998-BR721-GY710-BR
J3 P323 93921
RELAY
12
+24V
+310-PK
200-BK P37 J37
ETHERSTART VALVE TO ENGINE
FROMCYLINDER
VIMS DISPLAY MODULES
SERVICE TOOLCONNECTOR
CAT DATA LINK
VIM
SM
AIN
MO
DU
LE
ADEM IIELECTRONIC
CONTROLMODULE
(ECM)
LAPTOPCOMPUTER
CATELECTRONIC TECHNICIAN
COMMUNICATIONADAPTER
988F/990 CAT DATA LINK CIRCUIT
89
POWERTRAIN CONTROLMODULE
Cat Data Link +Cat Data Link -
2324
CATERPILLARMONITORING SYSTEM
Cat Data Link +Cat Data Link -
DEHJ
76
3132
9371
893-GN892-BRE794-YLE-793-BU
J42 P3 J3 P1 J1 ECM
Cat Data Link +Cat Data Link -ATA Data Link +ATA Data Link -
SERVICE TOOLCONNECTOR
MACHINE INTERFACECONNECTOR
LOGGED EVENTS
• Engine overspeed
• Air inlet restriction
• User defined shutdown
• Hydraulic system pressure fault
• Abnormal hydraulic pressure
• Low (lube) oil pressure
• Loss of coolant flow
• Low fuel pressure
• High coolant temperature
ADEM IIELECTRONIC
CONTROLMODULE
(ECM) GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
PUMP CONTROL VALVE
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP SENSOR
FUEL TEMPERATURE SENSOR
COOLANT FLOW SWITCH
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
INSTRUMENTPANEL
AUTO RETARDER CONTROL
EPTC II TRANSMISSION CONTROL
SERVICE TOOL CONNECTOR
CAT DATA LINK
FANFAN SPEED SENSOR
FAN CONTROL VALVE
TURBO INLET PRESSURE SENSOR
THROTTLE BACK-UP, ELEVATED LOW IDLE ENABLE,AND GROUND LEVEL SHUTDOWN (2) SWITCHES
THROTTLESENSOR
ACCELERATORPEDAL
DISCONNECT SWITCH
HEUI SYSTEMCOMPONENT DIAGRAM
MACHINEHARNESS
MACHINE APPLICATIONS
3529
ECM(3408E/3412E)
DECELERATIONPOSITION SENSOR
P1 J1
DECELERATION POSITION SENSOR CIRCUIT
+V DIGITAL SUPPLYDIGITAL RETURN
P2 J2
24 DECEL POSITION
A700-OR998-BR
P38 J38
ABC
+V DIGITALDIGITAL RETURN
SIGNAL
F702-GN
2208
1429
ECM(3408E/3412E)
THROTTLESWITCH
P1 J1
THROTTLE SWITCH CIRCUIT
THROTTLE - LOW IDLETHROTTLE - H.I. PARITYTHROTTLE - L.I. PARITYTHROTTLE - HIGH IDLEDIGITAL RETURN
F715-PUF718-BUF716-WHF717-YL998-BR
252429
ECM(3408E/3412E)
CRANK WITHOUTINJECTION PLUG
P1 J1
CRANK WITHOUT INJECTION PLUG CIRCUIT
CRANK W/O INJECT (NO)720-GN719-BR
J24 P24
998-BR
321
CRANK W/O INJECT (NC)DIGITAL RETURN
BK
PLUG "HHH"
PLUG "JJJ"
BK
352913
ECM(3408E/E3412E)
ENGINE FANSPEED SENSOR
P1 J1
+V DIGITAL SUPPLYDIGITAL RETURN
P2 J2
197
25
VARIABLE FAN CLUTCHPWM DR AND SOL RETURNENGINE FAN SPEED
A700-OR998-BR
J84 P84
ABC
+V DIGITALDIGITAL RETURN
SIGNAL
F703-GY
P41 J41
BC
ENGINE FANSOLENOID VALVE
E799-BRF700-BU
A/C ON (INPUT FROMCOMPRESSOR SWITCH)
MECHANICAL ENGINE FAN CONTROL CIRCUIT
F706-PU
ECMP1 J1
13192927142024
Throttle Lock RH Brake (NO)Throttle Lock RH Brake (NC)Digital ReturnThrottle Lock ON LampThrottle Lock Set/DeclerateThrottle Lock Resume/AccelerateThrottle Lock ON/OFF
998-BR
RIGHT BRAKE PEDAL SWITCH
F721-GYF722-OR
THROTTLELOCK LAMP
J3 P3
2113-OR BATT+
F717-YLF718-BUF719-BR
998-BR
998-BR
998-BR
998-BR
998-BR
THROTTLE LOCKSET/DECLERATION SW
THROTTLE LOCKRESUME/ACCLERATION SW
THROTTLE LOCK SW
THROTTLE LOCK CIRCUIT
ECM(3408E/E3412E)P2 J2
1907
HYDRAULIC FANPWM DRIVE AND SOL RETURN
P86 J86
21
HYDRAULIC FANSOLENOID VALVE
E799-BRF700-BU
HYDRAULIC ENGINE FAN CONTROL CIRCUIT
R0
5
1015
20
25
30
P
X100
24 V MPHkm/h
44
AUT
CATERPILLAR MONITORING SYSTEM
INLET AIR TEMP. SENSOR
SERVICE TOOL CONNECTORDATA LINK
EMSPANEL
DIAGNOSTIC LAMP
ALARM /WARNING LAMP
TO AIR SHUTOFF SOLENOID
TO ETHER SOLENOID RELAY
ADEM IIELECTRONIC
CONTROLMODULE
(ECM)GROUND
BOLT
15 AMPBREAKER
MAINPOWER RELAY
KEYSWITCH
TURBO OUTLET PRESS. SENSOR
SECONDARYSPEED/TIMING SENSOR
PRIMARYSPEED/TIMING SENSOR
HYDRAULICPRESSURE SENSOR
24 V
MACHINEINTERFACE
CONNECTOR
ENGINEHARNESS
PUMP CONTROL VALVE
COOLANT TEMP. SENSOR
ATMOSPHERIC PRESS. SENSOR
OIL PRESSURE SENSOR
HYDRAULIC TEMP. SENSOR
FUEL TEMPERATURE SENSOR
8 OR 12INJECTORS
TDC SERVICEPROBE ACCESS
PTO ENABLE/PTO UP/DOWN SWITCHESENGINE SHUTDOWN SWITCH
ETHER ENABLE/OVERRIDE SWITCHEMERGENCY STOP/VERIFY SWITCH
USER DEFINED SHUTDOWNTHROTTLE POSITION SENSOR
DISCONNECT SWITCH
INDUSTRIAL3408E/3412E HEUI SYSTEM
COMPONENT DIAGRAM
MACHINEHARNESS
FUEL PRESS. SENSOR
COOLANT LEVEL SWITCH
MAINTENANCE INDICATOR LAMP
PUMPCONTROL
VALVE
OILFILTER
OILCOOLER
HEUI
HEUI
OILSUMP
HYDRAULICPRESSURE
SENSOR
HYDRAULICTEMPERATURE
SENSORCOLD START
OILRESERVOIR OIL PRESSURE
SENSOR
HYDRAULICSUPPLY
PUMPGROUP
COOL DOWNCIRCUIT
FUEL TANK
FUELTEMPERATURE
SENSOR
PRESSUREREGULATING
VALVE
SECONDARYFUEL
FILTER
FUELTRANSFER
PUMP
PRIMARYFUEL FILTER
WATERSEPARATOR
LUBE OILPUMP
TO LUBESYSTEM
3408E/3412E HEUI FUEL SYSTEM
FLUID MANIFOLDHYDRAULIC PASSAGE
FLUID MANIFOLDHYDRAULIC PASSAGE
ECM