D6N Track-Type Tractor Hydraulic System Caterpillar

The machine electronic control module (ECM) and electronic control module 2, make decisions that are based on input information and memory information. After the ECMs receive input information, the ECMs send a corresponding response to the output components. The inputs and outputs of the ECMs are connected to the machine harness by two 70 contact connectors ("J1" and "J2") on the machine ECM, and by one 70 contact connector on ECM2. The inputs and outputs to the machine ECM can be viewed through the Caterpillar Electronic Technician (Cat ET) service tool.

Note: The machine ECM must be replaced if the machine ECM is damaged. An electrical failure of the machine ECM is unlikely. If a failure of a machine ECM is diagnosed, prior to replacing the machine ECM, always contact the technical communicator at your Caterpillar dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair cost and time.

Inputs

The inputs describe the status of the machine systems. Two types of inputs exist. The inputs can be either a switch type or a sensor type. Switches provide an open, a ground, or a +battery signal to the inputs of the controller. Sensors (frequency, PWM, or voltage) provide a changing signal to the sensor inputs of the controller. Refer to Tables 1, 2, and 3 for a list of inputs.

Outputs

The machine ECM responds to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician. Refer to Tables 1, 2, and 3 for a list of outputs.

Cat Data Link

The Cat data link is used in order to provide a connection for the Cat ET service tool for troubleshooting, testing, and calibrations. The Cat data link is bidirectional. The Cat data link allows the machine ECM to receive information. The Cat data link also allows the machine ECM to send information.

ECM Pins

Machine ECM Pins

Table 1

Contact Description for the Machine ECM "J1"
No.  (1)	Input/Output	Function
1	Input	Key Switch On
2	Input	Transmission Output Speed Sensor (1) +
3	Input	Transmission Output Speed Sensor (1) -
4	Input	Transmission Output Speed Sensor (2) +
5	Input	Transmission Output Speed Sensor (2) -
10	Input/Output	Cat Data Link +
13	Input	Battery -
14	Input	A/C Pressure
15	Input	Torque Converter Output Speed Sensor +
16	Input	Torque Converter Output Speed Sensor -
17	Input	Engine Speed Sensor +
18	Input	Engine Speed Sensor -
20	Input/Output	Cat Data Link -
21	Input	5V Sensor Return
22	Input	A/C Recirculation Temperature Sensor
23	Input	Batter -
24	Input	A/C Manual Mode
25	Input	A/C Auto Mode
26	Input	Implement Shutoff Switch (N.O.)
27	Input	Implement Shutoff Switch (N.C.)
29	Input	A/C Louver Temperature Sensor
30	Input	A/C Evaporation Freeze Probe
31	Input	Battery +
35	Input	Parking Brake Switch (N.O.)
37	Input	A/C Temperature Control Signal
38	Input	Battery +
39	Input	Battery +
40	Input	Parking Brake Switch (N.C.)
44	Input	+8V Sensor Supply
45	Input	8V Sensor Return
47	Input	Battery +
48	Output	Transmission Speed Clutch 1
49	Output	Transmission Speed Clutch 2
50	Input	PWM Driver Return 1-4
51	Output	Transmission Speed Clutch 3
52	Output	Brake Valve Solenoid
53	Input	Operator Presence Sensor
54	Input	PWM Driver Return 11-12
55	Input	PWM Driver Return 9-10
56	Input	10V Sensor Return
57	Input	Battery -
58	Output	Blade Tilt Right Solenoid
59	Output	Blade Tilt Left Solenoid
60	Input	PWM Driver Return 5-8
61	Output	Blade Raise Solenoid
62	Output	Blade Lower Solenoid
64	Input	Left Wiper Switch Input 2
65	Output	Transmission Reverse Clutch
66	Output	Transmission Forward Clutch
67	Output	Left Steering Valve Solenoid
68	Output	Right Steering Valve Solenoid
69	Output	10V Sensor Supply
70	Input	Battery -

( 1 )

The connector contacts that are not listed are not used. The connector has 70 contacts.

Table 2

Contact Description for the Machine ECM "J2"
No.  (1)	Input/Output	Function
1	Input	Key Switch (Crank)
2	Output	A/C Clutch Solenoid
3	Output	Parking brake Dump Valve Solenoid
4	Input	Load Return 1
5	Output	Second Brake Dump Valve Solenoid
6	Output	Backup Alarm
7	Output	Start Relay
8	Input	Load Return 2
10	Output	Wiper Relay Left
12	Output	Wiper Relay Right
14	Input	Alternator R-Terminal
16	Input	Gear Select Thumb Roller
18	Input	Differential Steering Pressure Sensor
191	Output	A/C Condensers Relays
20	Output	Water Valve Actuator Signal
24	Input	Steering Lever Position Sensor 1
25	Input	Steering Lever Position Sensor 2
28	Input	Throttle Switch (Low Idle)
29	Input	Throttle Switch (Low Idle Parity)
30	Input	Throttle Switch (High Idle)
31	Input	Throttle Switch (High Idle Parity)
32	Input	Service Brake Pedal Sensor
33	Input	Decel Pedal Position Sensor PWM Signal
34	Input	Steering Motor Speed Sensor A
35	Input	Steering Motor Speed Sensor B
37	Input	Washer Mode
39	Input	Right Wiper Switch Input
40	Input	Blade Angle Sensor
41	Input	Blade Raise Handle Sensor
42	Input	Blade Tilt Handle Sensor
43	Input	Ripper Joystick Sensor
44	Input	Decrement Switch (N.O.)
45	Input	Increment Switch (N.O.)
46	Input	Auto/Manual Blade Control & Blade Shake (N.O.)
47	Input	Auto/Manual Blade Control & Blade Shake (N.C.)
48	Input	Direction Lever (FNR) Position PWM Sensor 1
49	Input	Direction Lever (FNR) Position PWM Sensor 2
52	Input	Economic Mode Switch (N.O.)
53	Input	Economic Mode Switch (N.C.)
54	Input	Speed Recall Switch (N.O.)
55	Input	Speed Recall Switch (N.C.)
56	Input/Output	CAN A Data Link +
58	Input	Autoshift Switch (N.O.)
59	Input	Autoshift Switch (N.C.)
60	Input	Auto Kickdown Switch (N.O.)
61	Input	Winch Mode Switch (N.O.) (Free Spool)
62	Input	Winch Mode Switch (N.C.) (Brake Mode)
64	Input/Output	CAN B Data Link +
65	Input/Output	CAN B Data Link -
67	Input/Output	CAN A Data Link +
68	Input/Output	CAN A Data Link -
70	Input/Output	CAN A Data Link -

( 1 )

The connector contacts that are not listed are not used. The connector has 70 contacts.

ECM2 Pins

Table 3

Contact Description for the Machine ECM "J2"
No.  (1)	Input/Output	Function
1	Input	Battery +
2	Input	Battery -
7	Input	Location Code (GND)
8	Input	Location Code (GND)
11	Input	Reel In Solenoid Return
12	Input	Reel Out Solenoid Return
13	Input	Free Spool Solenoid Return
14	Input	Battery +
15	Input	Battery -
19	Input	Location Code (GND)
20	Input	Power Train Oil Filter Bypass Switch
21	Input	Charge Filter Bypass Switch
22	Input	Implement Calibration Sensor
24	Input	Battery +
25	Input	Battery -
26	Output	Implement Shutoff Solenoid
27	Input	Implement Shutoff Solenoid Return
32	Output	Brake Off Solenoid Supply
33	Input	Brake Off Solenoid Return
34	Output	System Flow Solenoid
35	Input	System Flow Solenoid Return
36	Input	Hydraulic Oil Temperature Sensor
37	Input	Transmission Oil Temperature Sensor (Sump)
38	Input	Fuel Level Sender
39	Input	Torque Converter Output Temperature Sensor
40	Output	Accessory Isolation Solenoid
41	Input	Accessory Isolation Solenoid Return
42	Output	Blade Angle Left Solenoid
43	Input	Blade Angle Left Solenoid Return
45	Input	Winch Pressure Switch
46	Input	Winch High Temperature Switch
47	Input	Winch Filter Switch
48	Output	Blade Angle Right Solenoid
49	Input	Blade Angle Right Solenoid Return
50	Output	Ripper Raise Solenoid
51	Input	Ripper Raise Solenoid Return
55	Input	Sensor Return
58	Output	Ripper Lower Solenoid
59	Input	Ripper Lower Solenoid Return
64	Input/Output	CAN A Data Link +
65	Input/Output	CAB A Data Link -
68	Output	+8V Sensor Power

( 1 )

The connector contacts that are not listed are not used. The connector has 70 contacts.