INTERACTIVE SCHEMATIC Bookmarks
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Information Component Table Tap Table Fluid Power Symbols Electrical Symbols
Schematic Machine Views Front Frame Rear Frame Tap Views
The Bookm arks panel panel will allow you to quickly navigate to points of interest. EC-C2 EC-C3
E-C60 E-C61
Click on any text th at is BLUE and and und erlined. These These are hyperlin hyperlin ks t hat can be used to n avigate the schematic schematic and m achine views.
EC-C1
SENR6679-02 February 2001
938G Wheel Loader and IT38G Integrated Toolcarrier Electrical System 938G:
IT38G:
4YS1-1877
7BS1-899
COMPONENT LOCATION Page 1 of 2 Schematic Location
Machine Location
Schematic Location
Machine Location
Air Conditioner
E-11
2
Sender - Coolant Temp
D-15
35
Alarm
G-8
C
Sender - Fuel Level
E-15
36
Alarm - Backup
D-15
3
Sender - Hydraulic Oil Temp
C-14
37
Alarm - Secondary Steering
G-8
A
Sender - Torque Converter Oil Temp
C-13
38
Alternator
E-15
4
Sensor - Engine Speed
C-14
39
Batteries - 12 Volt
F-14
5
Sensor - PCS Lift Cyl Head End Oil Press
B-2, E-1
21
Breaker - Air Seat
F-10
C
Sensor - PCS Lift Position
C-2, E-1
22
Breaker - Alternator
B-14
47
Sensor - TCS Articulation Angle Position
A-4
23
Breaker - Auxiliary
B-14
47
Sensor - TCS Left Front Wheel Speed
B-2, E-1, G-1
24
Breaker - Hood
B-14
47
Sensor - TCS Left Rear Axle Speed
I-6
25
Breaker - Lamp
F-10
C
Sensor - TCS Right Front Wheel Speed
A-2, D-1, G-1
26
Breaker - Main
B-14
C
Sensor - TCS Right Rear Axle Speed
I-6
27
Cigar Lighter
E-7
A
Sensor - Transmission Speed
C-13
39
Control - Autoshift Electronic (CST)
A-7
7
Service Meter
G-6
A
Control - Hood Relay
A-14
8
Solenoid - 4th Function Pilot Diverter
H-1
21
Control - Payload Electronic (PCS)
E-4
12
Solenoid - A/C Clutch
C-15
6
Control - Secondary Steering Electronic
B-6
7
Solenoid - Axle Oil Cooler Clutch
D-14
44
A-12
9
Solenoid - Countershaft Transmission
D-13
31
H-6
B
Solenoid - Quick Coupler
B-2
33
Converter - 24 Volt to 12 Volt
G-10
34
Solenoid - Ride Control
C-2, F-1, I-1
21
Defroster - Rear
F-12
17
Solenoid - Shutdown
C-15
28
Diode Block Assembly
H-8
A
Solenoid - Start Aid
E-13
29
Flasher
F-6
A
Solenoid - TCS Left Front Proportional
I-5
30
Component
Control - Traction Electronic (TCS) Control - Transmission Shifter (CST)
Component
COMPONENT LOCATION Page 2 of 2 Schematic Location B-8
Machine Location 7
Switch - Bucket Positioner
Schematic Location C-2, E-1, H-1
Machine Location D
Lamp - Alternator
C-7
A
Switch - Bucket/Fork Select
F-8
D
Lamp - Brake Oil Press
H-7
A
Switch - Defrost
F-8
D
Lamp - Coolant Temp
G-7
A
Switch - Dimmer
F-6
B
Lamp - Engine Oil Press
H-7
A
Switch - Disconnect
F-14
32
Lamp - Flood Lamp
D-7
61
Switch - Downshift
B-8
D
Lamp - Hazard
F-5
A
Switch - Engine Oil Press
C-14
40
Lamp - High Beam
F-5
A
Switch - Fork Positioner
H-1
D
Lamp - Hydraulic Oil Temp
H-7
A
Switch - Forward Horn
F-6
B
Lamp - Left Turn
F-5
A
Switch - Front Intermittent Wiper
D-7
A
Lamp - Park Brake
D-7
A
Switch - Hood Actuator
A-14
8
Lamp - Primary Steering Oil Press
D-7
A
Switch - Hydraulic Lock Detent Override
F-8
A
Lamp - Right Turn
F-5
A
Switch - Key Start
F-6
B
Lamp - Secondary Steering Oil Press
D-7
A
Switch - Kickout
E-8
D
Lamp - Transmission Oil Temp
G-7
A
Switch - Lamp
H-7
A
Module - (TCS) Display
D-5
13
Switch - Lamp Test
G-7
A
C-3, F-2, I-2
15
Switch - Lift Positioner
C-2, E-1, H-1
33
Motor - Front Wiper
E-4
16
Switch - Parking Brake
G-10
45
Motor - Heater/Air Conditioner Blower
E-11
18
Switch - Primary Steering Oil Press
A-6
42
Motor - Hood Actuator
A-14
1
Switch - Quick Coupler
F-8
D
C-3, F-3, I-3
15
Switch - Rear Wiper
C-7
A
Motor - Rear Wiper
F-12
17
Switch - Ride Control
E-8
D
Motor - Secondary Steering Pump
A-6
19
Switch - Secondary Steering Manual
D-7
A
Component Lamp - Action
Motor - Front Washer
Motor - Rear Washer
14
Component
CONNECTOR LOCATION Page 1 of 2 Schematic Location
Machine Location
CONN 1
D-15
39
CONN 2
D-15
3
CONN 3 Aux Start Receptacle
F-14
58
CONN 4
C-14
6
CONN 5
A-13
40
CONN 6
C-13
48
CONN 7
E-12, I-9
18
CONN 8
D-12, I-9
52
CONN 9 Aux 12V Power
D-12
53
CONN 10
C-12
7
CONN 11
C-12
7
CONN 12
B-12
7
CONN 13 TCS Calibrate Plug
B-11
7
CONN 14 A/C and Heater
E-11
18
CONN 15
F-11
2
CONN 16
F-11
2
Connector Number
CONNECTOR LOCATION Page 2 of 2 Schematic Location
Machine Location
CONN 29
E-6
A
CONN 30
E-6
A
CONN 31
E-6
A
CONN 32
D-6
A
CONN 33
A-6
7
CONN 34
A-5, B-2
7
CONN 35
A-5, E-3, H-3
7
CONN 36
B-5, E-3, H-3
7
CONN 37
G-5
A
CONN 38
G-4
A
CONN 39 PCS Data Connection
D-4
A
CONN 40
D-4
12
CONN 41
D-4
12
Connector Number
CID / MID / FMI Page 1 of 2 Component Identifiers (CID¹) Traction Contr ol System (MID² 028) Component
CID 168
Electrical System Voltage
248
Data Link
263
Sensor Supply Voltage
270
Harness Code
296
Transmission ECM
605
Left Front Speed Sensor
606
Right Front Speed Sensor
607
Left Rear Speed Sensor
608
Right Rear Speed Sensor
609
Left Front Brake Solenoid
610
Right Front Brake Solenoid
611
Left Rear Brake Solenoid
612
Right Rear Brake Solenoid
613
On/Off Solenoid
615
Articulation Sensor
616
Test/Enable Switch
653
Traction Control System ECM
687
Options Code Plug
¹ The CID is a diagnostic code that indicates which component is faulty. ² The MID is a diagnostic code that indicates which electronic control module diagnosed the fault.
Component Identifiers (CID¹) CST Autoshi ft Contro l (MID² 081)
CID / MID / FMI Page 2 of 2 Component Identifiers (CID¹) Payload Cont rol System (MID² 74) Component
CID 168
Electrical System Voltage
254
Payload Electronic Control Module
350
Position Sensor (Lift Linkage)
364
Pressure Sensor (Lift Cylinder Head End)
769
Pressure Sensor (Lift Cylinder Rod End)
817
Battery (Internal Backup)
820
Keypad Data Link Incorrect
¹ The CID is a diagnostic code that indicates which component is faulty. ² The MID is a diagnostic code that indicates which electronic control module diagnosed the fault.
Failure Mode Identifiers (FMI)¹ FMI No.
Failure Description
0
Data valid but above normal operational range.
1
Data valid but below normal operational range.
2
D t
ti
i t
itt
t
i
t
SPECIFICATION AND RELATED MANUALS Page 1 of 2
Off Machin e Switc h Specification Part No.
Function
Actuate
Deactuate
Contact Position
-1.1 ± 0.8°C 2.2 ± 0.8°C Normally Open (30 ± 1.4°F) (36 ± 1.4°F) 38 ± 3°C 27°C MIN 3E-6449 Coolant Temperature (Start Aid) Normally Closed (100 ± 5°F) (81°F MIN) Primary Steering Pressure 1200 kPa MAX 700 ± 100 kPa A-B Normally Open 3E-6450 (174.0 psi MAX) (102 ± 14.5 psi) A-C Normally Closed Secondary Steering Pressure 129 ± 4°C 96°C MIN 104-3007 ² Torque Converter Oil Temperature Normally Open (264 ± 7°F) (205°F MIN) 102 ± 3°C 90°C MIN 104-3008 ² Hydraulic Oil Temperature Normally Open (216 ± 5°F) (194°F MIN) 275 to 1750 kPa¹ 114-5333 A/C (High / Low) Pressure Normally Open³ (39.9 to 253.8 psi) 107 ± 3°C 95°C MIN 118-5144 ² Coolant Temperature Normally Open (225 ± 5°F) (203°F MIN) 65 ± 3°C 58°C MIN 155-8998 Axle Oil Cooler Temperature Normally Open (149 ± 5°F) (136°F MIN) 10700 kPa MAX 8960 ± 537 kPa A-B Normally Open 175-3244 Brake Oi l Pressure (1552 psi MAX) (1300 ± 78 psi) A-C Normally Closed ¹ With increasing pressure the closed condition can be maintained up to 2800 kPa (406 psi), with decreasing pressure the closed condition can be maintained down to 170 kPa (25 psi). ² This part has an integral temperature sender. See also Resistor, Sender and Solenoid Specifications. 3E-5464
A/C Thermostat
³ Contact position at the contacts of the harness connector.
SPECIFICATION AND RELATED MANUALS Page 2 of 2 Resist or, Sender and Solenoid Specific ations Part No.
Component Description
3E-8575
Solenoid:
Quick Coupler
8C-3663
Solenoid:
Shutdown
9G-1950
Resistor:
Blower Motor
104-3007 ²
Sender:
Torque Converter Oil Temperature
104-3008 ²
Sender:
Hydraulic Oil Temperature
106-5122 118-5144 ²
Solenoid: Sender:
A/C Clutch Coolant Temperature
Resistance (Ohms)¹ 24.9 ± 0.4 Latch Coil: 1.55 ± 0.16 Unlatch Coil: 10.3 ± 1.0 Overall: 2.0 ± 0.1 Tap: 1.0 ± 0.05 54.4°C (130°F): 6565 ± 695 115.6°C (240°F): 526 ± 61 54.4°C (130°F): 6565 ± 695 115.6°C (240°F): 526 ± 61 17.6 ± 0.6 54.4°C (130°F): 6565 ± 695 115.6°C (240°F): 526 ± 61
Solenoid:
Auxiliary Valve Float Valve Lift Positioner Valve Tilt Positioner Valve
85.3 ± 5
124-3052
Solenoid:
TCS TCS TCS TCS
7.8 ± 1.0
134-7262
Sender:
149-2658
Solenoid:
Ride Control
32.6 ± 1.6
152-8351
Solenoid:
4th Function Diverter
32.6 ± 1.6
152-8385
Solenoid:
TCS Pilot On/Off
32.6 ± 1.6
168-6452
Solenoid:
Axle Oil Cooler
9.4 ± 5
186-1526
Solenoid:
CST Transmission Valve (Qty=6)
31 ± 3
122-6344
Left Front Proportional Valve Left Rear Proportional Valve Right Front Proportional Valve Right Rear Proportional Valve
Fuel Level
Empty: 250 ± 10 Full: 33.5 ± 6
HARNESS and WIRE Electri cal Schematic Symbol s Symbols
T
Pressure Symbol
Temperature Symbol
Level Symbol
Flow Symbol
Circuit Breaker Symbol
Symbols and Definitions Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it. Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it. Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.). No circle indicates that the wire cannot be disconnected from the component. Ground (Wired): This indicates that the component is connected to a grounded wire. The grounded wire is fastened to the machine.
Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine. Reed Switch : A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed r eed switch.
T
Sender: A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure.
Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay.
