12M Series 3, 140M Series 3, 160M Series 3, 140, 150 and and 160 Motor Graders Electronic Control (Power Train System) Caterpillar


Electronic Control (Power Train System)
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1.1. Electronic Control Modules
2.2. Transmission / Chassis ECM
3.2. AWD ECM
4.2. ECM Pull Up Voltage
5.2. ECM Pull Down Voltage
6.1. Pin Locations
7.1. Inputs
8.2. Sensors
9.3. Transmission Input Speed Sensor
10.3. Transmission Intermediate Speed Sensor
11.3. Transmission Output Speed Sensors
12.3. Transmission Oil Temperature Sensor
13.3. Modulation Pedal Sensor
14.3. Parking Brake Pressure Sensor
15.3. AWD Wheel Speed Sensors
16.3. AWD Hydraulic Temperature Sensor
17.2. Switches
18.3. Transmission Filter Bypass Switch
19.3. Direction Switch
20.3. Upshift and Downshift Switch
21.3. Parking Brake Switch
22.3. Modulation Pedal Switch
23.3. Autoshift Switch
24.3. Differential Lock Switch
25.3. AWD Switch
26.3. AWD Charge Filter Switch
27.1. Outputs
28.2. On/Off Solenoids
29.3. Parking Brake Solenoid
30.3. Differential Lock Solenoid
31.3. Transmission Pump Bypass Solenoid
32.3. AWD Clutch Solenoids
33.2. Proportional Solenoids
34.3. ECPC Solenoids
35.3. AWD Drive Pump Solenoids
36.3. AWD Motor Solenoid
37.1. Data Link
38.2. Cat Data Link
39.2. CAN Data Link

Electronic Control Modules

Transmission / Chassis ECM



Illustration 1g03307257


Illustration 2g01309473
ECM Connectors and Contacts

The Transmission / Chassis ECM determines actions that are based on input information and memory information. After the Transmission / Chassis ECM receives the input information, the ECM sends a corresponding response to the outputs. The inputs and outputs of the Transmission / Chassis ECM are connected to the machine harness by two 70 contact connectors (J1 and J2). The ECM sends the information to the AVSpare Electronic Technician (Cat ET) on the Cat Data Link.

Note: The ECM is not serviceable. The ECM must be replaced if the ECM is damaged. Replace the ECM if a failure is diagnosed.

AWD ECM



Illustration 3g03307257


Illustration 4g01309473
ECM Connectors and Contacts

The AWD ECM determines actions that are based on input information and memory information. After the AWD ECM receives the input information, the ECM sends a corresponding response to the outputs. The inputs and outputs of the AWD ECM are connected to the machine harness by two 70 contact connectors (J1 and J2). The ECM sends the information to the AVSpare Electronic Technician (Cat ET) on the Cat Data Link.

Note: The ECM is not serviceable. The ECM must be replaced if the ECM is damaged. Replace the ECM if a failure is diagnosed.

ECM Pull Up Voltage

In order to aid in diagnostics of certain types of electrical circuits that are controlled by the ECM, an internal "pull up voltage" is connected to ECM switch and sensor signal input contacts. An above normal voltage is internally connected to the ECM signal input circuit through a resister.

During normal operation, the switch or sensor signal will hold the circuit low or at a certain signal amplitude, however, circuit conditions such as a loss of power to the component, a disconnection, or an open circuit will allow the circuit to be pulled high by the ECM pull up voltage. This condition will result in an above normal voltage condition at the ECM contact. As a result, the ECM will activate an FMI 03 (voltage above normal) diagnostic code for the affected circuit.

The types of ECM input circuits that have pull up voltage present are:

  • Pulse Width Modulated (PWM) sensor input circuits

  • Switch to Ground Input switch input circuits

  • Active analog (voltage) input signal circuits

  • Passive analog (resistance) input signal circuits

ECM Pull Down Voltage

In order to aid in diagnostics of electrical circuits that are controlled by the ECM, an internal "pull down voltage" is connected to ECM switch to battery type input circuits.

During normal operation, the switch contacts that are allowing the connection to a voltage source will hold the circuit high. When circuit conditions such as a loss of power to the switch supply voltage, a disconnection in the switch circuit or an open circuit will allow the circuit to be pulled low by the ECM pull down voltage. This condition will result in a below normal voltage condition at the ECM contact. As a result, the ECM will activate an FMI 04 (voltage below normal) diagnostic code for the affected circuit.

Pin Locations

Table 1
Transmission / Chassis ECM Contact Description J1 Contact Descriptions(1) 
No.(2)  Type  Function 
Differential Speed Input +  Transmission Input Speed Sensor + 
Differential Speed Input -  Transmission Input Speed Sensor - 
Differential Speed Input +  Intermediate Speed Sensor 1 + 
Differential Speed Input -  Intermediate Speed Sensor 1 - 
Differential Speed Input +  Intermediate Speed Sensor 2+ 
Differential Speed Input -  Intermediate Speed Sensor 2- 
Differential Speed Input +  Transmission Speed Sensor 4 + 
Differential Speed Input -  Transmission Speed Sensor 4 - 
10  Cat Data Link +  Cat Data Link + 
11  Sensor Power Output  5V Sensor Supply 
13  Battery Return  Battery - 
15  Differential Speed Input +  Transmission Speed Output Sensor 1 + 
16  Differential Speed Input -  Transmission Speed Output Sensor 1 - 
17  Differential Speed Input +  Transmission Speed Output Sensor 2 + 
18  Differential Speed Input -  Transmission Speed Output Sensor 2 - 
20  Cat Data Link -  Cat Data Link - 
21  Sensor Power Return  5V Sensor Return 
22  Analog Input  Transmission Oil Temperature Sensor 
23  Battery Return  Battery - 
26  Switch to Ground Input  ECM Location 0 
31  Battery Power Input  Battery + 
32  Switch to Ground Input  ECM Location Enable 
33  Switch to Ground Input  Transmission Filter Bypass Switch 
38  Battery Power Input  Battery + 
39  Battery Power Input  Battery + 
44  Sensor Power Output  8 V Sensor Supply 
45  Sensor Power Return  8 V Sensor Return 
46  Battery Power Input  Battery + 
47  Battery Power Input  Battery + 
48  Sourcing Driver Output  Transmission Solenoid 7 
49  Sourcing Driver Output  Transmission Solenoid 2 
50  Sourcing Driver Return  PWM Drivers 1 - 4 Return 
51  Sourcing Driver Output  Transmission Solenoid 3 
52  Sourcing Driver Output  Transmission Solenoid 4 
54  Sourcing Driver Return  PWM Driver 11-12 Return 
55  Sourcing Driver Return  PWM Driver 9-10 Return 
56  Sensor Power Return  10V Sensor Return 
57  Battery Return  Battery - 
58  Sourcing Driver Output  Transmission Solenoid 5 
59  Sourcing Driver Output  Park Brake Solenoid 
60  Sourcing Driver Return  PWM Driver 5-8 Return 
61  Sourcing Driver Output  Transmission Solenoid 1 
62  Sourcing Driver Output  Transmission Solenoid 8 
65  Sourcing Driver Output  Transmission Solenoid 6 
69  Sensory Power Output  10V Sensor Supply 
70  Battery Return  Battery - 
(1) Contacts that are not listed are not used.
(2) The connector contacts that are not listed are not used.

Table 2
Transmission / Chassis ECM Contact Description J2(1) 
No.(2)  Type  Function 
Sourcing Driver Output  Transmission Pump Bypass Solenoid 
Sourcing Driver Return  Load Return 1 
Sourcing Driver Output  Differential Lock Solenoid 
Sourcing Driver Return  Load Return 2 
22  Return  Sensor / Driver Return 
23  Switch to Ground Input  Direction Switch Forward 
26  PWM Input  Transmission Pump Pressure Sensor 
28  Switch to Ground Input  Direction Switch Neutral 
29  Switch to Ground Input  Direction Switch Reverse 
30  Switch to Ground Input  Upshift Switch N/O 
31  Switch to Ground Input  Upshift Switch N/C 
36  Switch to Ground Input  Downshift Switch N/O 
37  Switch to Ground Input  Downshift Switch N/C 
38  Switch to Ground Input  Parking Brake Switch (OFF) 
39  Switch to Ground Input  Parking Brake Switch (ON) 
43  PWM Input  Modulation Pedal Position Sensor 
45  Switch to Ground Input  Modulation Pedal Switch N/C 
46  Switch to Ground Input  Modulation Pedal Switch N/O 
47  Switch to Ground Input  Transmission Auto/Manual N/O 
51  PWM Input  Park Brake Pressure Sensor 
52  Switch to Ground Input  Transmission Auto/Manual N/C 
53  Switch to Ground Input  Differential Lock N/O 
59  Switch to Ground Input  Differential Lock Auto/Manual Switch 
61  Switch to Ground Input  Compression Brake N/C 
62  Switch to Ground Input  Compression Brake N/O 
63  Return  Sensor Driver Return 
64  CAN Data Link +  CAN B Data Link + 
65  CAN Data Link -  CAN B Data Link - 
67  CAN Data Link +  CAN A Data Link + 
68  CAN Data Link -  CAN A Data Link - 
(1) The ECM responds to an active input only when all of the necessary conditions are satisfied.
(2) The connector contacts that are not listed are not used.

Table 3
AWD ECM Contact Description J1 Contact Descriptions(1) 
No.(2)  Type  Function 
Differential Speed Input -  Right Front Motor Speed Sensor 1 
Differential Speed Input -  Right Front Motor Speed Sensor 2 
Differential Speed Input -  Left Front Motor Speed Sensor 1 
Differential Speed Input -  Left Front Motor Speed Sensor 2 
10  Cat Data Link +  Cat Data Link + 
13  Battery Return  Battery - 
20  Cat Data Link -  Cat Data Link - 
22  Analog Input  Hydraulic Oil Temperature (AWD) 
23  Battery Return  Battery - 
28  Switch to Ground Input  ECM Location 0 
31  Battery Power Input  Battery + 
32  Switch to Ground Input  ECM Location Enable 
33  Switch to Ground Input  AWD Switch (Creep) 
34  Switch to Ground Input  AWD Switch (OFF) 
38  Battery Power Input  Battery + 
39  Battery Power Input  Battery + 
40  Switch to Ground Input  AWD Switch (Manual) 
42  Switch to Ground Input  Right Front Charge Filter Switch 
43  Switch to Ground Input  Left Front Charge Filter Switch 
44  Sensor Power Output  8 V Sensor Supply 
45  Sensor Power Return  8 V Sensor Return 
46  Battery Power Input  Battery + 
47  Battery Power Input  Battery + 
48  Sourcing Driver Output  Left Front Drive Pump Forward Solenoid 
49  Sourcing Driver Output  Left Front Drive Pump Reverse Solenoid 
50  Sourcing Driver Return  PWM Drivers 1 - 4 Return 
51  Sourcing Driver Output  Right Front Drive Pump Forward Solenoid 
52  Sourcing Driver Output  Right Front Drive Pump Reverse Solenoid 
56  Sensor Power Return  10V Sensor Return 
57  Battery Return  Battery - 
58  Sourcing Driver Output  Left Front Drive Motor Solenoid 
59  Sourcing Driver Output  Right Front Drive Motor Solenoid 
60  Sourcing Driver Return  PWM Driver 5-8 Return 
70  Battery Return  Battery - 
(1) Contacts that are not listed are not used.
(2) The connector contacts that are not listed are not used.

Table 4
AWD ECM Contact Description J2(1) 
No.(2)  Type  Function 
Sourcing Driver Output  Left AWD Clutch Forward Solenoid 
Sourcing Driver Return  Load Return 1 
Sourcing Driver Output  Right AWD Clutch Forward Solenoid 
Sourcing Driver Output  Right AWD Clutch Reverse Solenoid 
Sourcing Driver Output  Left AWD Clutch Reverse Solenoid 
Sinking Driver Output  AWD System Indicator 
10  Sinking Driver Output  AWD Engaged Indicator 
24  PWM Input  Left AWD Clutch Pressure Sensor 
25  PWM Input  Right AWD Clutch Pressure Sensor 
26  PWM Input  AWD Control Dial Position Sensor 
67  CAN Data Link +  CAN A Data Link + 
68  CAN Data Link -  CAN A Data Link - 
(1) The ECM responds to an active input only when all of the necessary conditions are satisfied.
(2) The connector contacts that are not listed are not used.

Inputs

The machine has several different types of input devices. The ECM receives machine status information from the input devices and determines the correct output action that is needed in order to control machine operations based on memory and software parameters. The machine utilizes the following types of inputs: switch type and sensor type.

Switches provide signals to the switch inputs of the ECM. The possible outputs of a switch are listed: an open signal, a grounded signal and + battery signal.

Sensors provide an electrical signal to the ECM that constantly changes. The sensor input to the ECM can be one of several different types of electrical signals such as: pulse width modulated (PWM) signals, voltage signals and frequency input signals. Each possible input to the ECM is listed in the tables for the 70-pin connectors.

Inputs provide information to the ECM in the form of sensors or switches.

Sensors

Sensors provide information to the ECM about the intent of the operator or changing conditions. The sensor signal changes proportionally to the changing of operator input or changing conditions. The following types of sensor signals are used by the ECM.

Frequency - The sensor produces a signal and the frequency (Hz) varies as the condition changes.

Pulse width modulated - The sensor produces a signal. The duty cycle of the signal varies as the condition changes. The frequency of this signal is constant.

Analog - The ECM measures the voltage that is associated to a specific condition of the control.

Transmission Input Speed Sensor



Illustration 5g03319385

The ECM receives signals from the transmission input speed sensors as frequency signals. The transmission input speed sensors are passive sensors. The signals indicate the rotational speed of the output of the transmission. The signal is generated by a gear passing in front of the sensor, with one full pulse generated per tooth on the gear. The sensor has an inductive coil that creates a voltage pulse to the ECM when a gear tooth passes the sensor. The ECM interprets the frequency of the pulses as the speed of the gear.

Transmission Intermediate Speed Sensor



Illustration 6g03319385

The ECM receives signals from the transmission intermediate speed sensors as frequency signals. The transmission intermediate speed sensors are passive sensors. The signals indicate the rotational speed of the output of the transmission. The signal is generated by a gear passing in front of the sensor, with one full pulse generated per tooth on the gear. The sensor has an inductive coil that creates a voltage pulse to the ECM when a gear tooth passes the sensor. The ECM interprets the frequency of the pulses as the speed of the gear.

Transmission Output Speed Sensors



Illustration 7g03534910

The ECM receives signals from the transmission output speed sensors as a frequency signal. The transmission output speed sensors are passive sensors. The signal indicates the rotational speed of the output shaft of the transmission. The signal is generated by a gear passing in front of the sensor, with one full pulse generated per tooth on the gear. The sensor has an inductive coil that creates a voltage pulse to the ECM when a gear tooth passes the sensor. The ECM interprets the frequency of the pulses as the speed of the gear.

Transmission Oil Temperature Sensor



Illustration 8g03425409

The transmission oil temperature is a passive analog sensor. The sensor has an internal resistance that varies as the temperature of the transmission oil changes. The ECM detects the changes in resistance as a voltage drop and by this voltage, determines the temperature of the transmission oil.

Modulation Pedal Sensor



Illustration 9g03541441

The modulation pedal sensor is an active pulse width modulated position sensor. The duty cycle of the sensor is proportional to the position of the inching pedal. The ECM monitors this operator input to determine operator movement request.

Parking Brake Pressure Sensor



Illustration 10g03324121

The parking brake pressure sensor measures the pressure of the hydraulic oil that releases the parking brake in the transmission. The sensor sends a pulse width modulated signal to the ECM. The duty cycle of the signal increases as pressure increases.

AWD Wheel Speed Sensors



Illustration 11g03547579

The AWD wheel speed sensors are active frequency sensors. Each sensor generates two signals for each wheel. The signal indicates the rotational speed of the wheels. The signal is generated by a gear passing in front of the sensor, with one full pulse generated per tooth on the gear. The signal is low when a gear tooth is in front of the sensor and high when in a valley.

AWD Hydraulic Temperature Sensor



Illustration 12g03547942

Switches

Switches provide an open signal, a ground signal, or a +battery signal to the inputs of the ECM. Switches are open or closed.

  • When a switch is open, no signal is provided to the corresponding input of the ECM. This “no signal” condition is also called “floating”.

  • When a switch is closed, a ground signal or a +battery signal is provided to the corresponding input of the ECM.

Transmission Filter Bypass Switch



Illustration 13g03534958

The transmission charge filter bypass switch is a pressure switch. The switch alerts the ECM when the transmission charge filter is being bypassed. The contact floats to a high voltage when the switch is not closed. When the switch closes, the contact is pulled to a low or ground voltage state by the return line.

Direction Switch



Illustration 14g03868468

The direction switch is the trigger on the let side control stick. The switch is a three position switch and depending on the position of the switch (FORWARD, NEUTRAL, or REVERSE) one of three ECM contacts is pulled to a low voltage state. The ECM monitors the voltage state of the three contacts to determine the operator request for direction.

Upshift and Downshift Switch



Illustration 15g03868464

The upshift and downshift switches are single pole switches with a normally open and a normally closed contact. The ECM monitors the voltage state of the normally open and normally closed contact. When the switch is engaged, the normally open contact is closed and is pulled to a low voltage state. The normally closed contact is opened and floats to a high voltage state. The upshift switch is located on the top of the control stick and the down shift is located in the lower center.

Parking Brake Switch



Illustration 16g03431151

The parking brake switch is a two pole switch. The switch has a common return for both poles of the switch, and three ECM contacts. Two of the contacts are on one pole and are a normally open and a normally closed contact. In the normally operating position, the normally open contact floats to a high voltage state and the normally closed contact is pulled to a low voltage state. The last ECM contact is an additional normally closed contact. When the switch is activated the normally closed contacts float to a high voltage state, and the normally open contact is pulled to a low voltage state. By monitoring the voltage state of the three ECM contacts, the ECM is able to determine the operator request for parking brake.

Modulation Pedal Switch



Illustration 17g03543004

The modulation pedal switch is a single pole switch. The switch has a normally open contact and a normally closed contact. In the normally operating position, the normally open contact floats to a high voltage state and the normally closed contact is pulled to a low voltage state. The last ECM contact is an additional normally closed contact. When the switch is activated the normally closed contacts float to a high voltage state, and the normally open contact is pulled to a low voltage state. By monitoring the voltage state of the three ECM contacts, the ECM is able to determine if the modulation pedal switch has been engaged.

Autoshift Switch



Illustration 18g03545538

The autoshift switch is a two pole switch. The switch uses the first pole to determine the state of switch, and the second pole to control the switch backlight. The switch has a normally open and a normally closed contact. In the normally operating position, the normally open contact floats to a high voltage state and the normally closed contact is pulled to a low voltage state. The last ECM contact is an additional normally closed contact. When the switch is activated the normally closed contacts float to a high voltage state, and the normally open contact is pulled to a low voltage state. By monitoring the voltage state of the three ECM contacts, the ECM is able to determine the operator request for transmission shift control.

Differential Lock Switch



Illustration 19g03545756

The differential lock switch is a single pole switch. The switch has a normally open and a normally closed contact. In the normally operating position, the normally open contact floats to a high voltage state and the normally closed contact is pulled to a low voltage state. The last ECM contact is an additional normally closed contact. When the switch is activated the normally closed contacts float to a high voltage state, and the normally open contact is pulled to a low voltage state. By monitoring the voltage state of the three ECM contacts, the ECM is able to determine the operator request for the differential to be locked.

AWD Switch



Illustration 20g03548220

The AWD switch is a three position rotary switch. The switch has a common return that is connected to one of three ECM contacts, depending on the position of the switch. When an ECM contact is not connected to the common return, the contact floats to a high voltage state. When an ECM contact is connected to the common return, the contact is pulled to a low voltage state. The ECM monitors the voltage state of the contacts and determines the operator request for AWD operation mode.

AWD Charge Filter Switch



Illustration 21g03548458

The AWD charge filter switch is a single pole switch. The switch has an ECM contact that is normally open and floats to a high voltage state. When the switch closes, the contact is pulled to a low voltage state. The ECM monitors the voltage state of the switch to determine if either the left or right AWD filter is being bypassed.

Outputs

The 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.

On/Off Solenoids

Parking Brake Solenoid



Illustration 22g03535137

The parking brake solenoid is an on/off type solenoid. The ECM energizes the solenoid when the parking brakes are to be released. The parking brake is normally spring applied, and when the parking brake solenoid is energized, transmission hydraulic oil is allowed to release the braking brake.

Differential Lock Solenoid



Illustration 23g03535518

The differential lock solenoid is an on/off type solenoid. The ECM energizes the solenoid based on operator request. When the solenoid is energized, the differential is locked.

Transmission Pump Bypass Solenoid



Illustration 24g03425512

The transmission pump bypass solenoid is an on/off type solenoid. The ECM energizes the solenoid based on transmission oil temperature. When the solenoid is energized, the pumps are bypassed.

AWD Clutch Solenoids



Illustration 25g03551858

The AWD clutch solenoids control the clutch in the final drive. There is a forward and reverse solenoid for the left and right front wheels. The solenoids are on / off type solenoids. The forward and reverse solenoids work with the hydraulic clutch circuit to allow for controlled movement in either forward or reverse direction. When the solenoid is not engaged, the clutch is disengaged for that direction.

Proportional Solenoids

ECPC Solenoids



Illustration 26g03535025

Each of these solenoid valves is designed to control the flow of power train oil to a clutch plate. When the solenoid is not engaged or receiving a low duty cycle signal, the solenoid does not allow power train hydraulic oil to engage a clutch plate. As the duty cycle of the signal to the solenoid increases, the solenoid allows some flow and the clutch begins to engage. When the duty cycle of the signal to the solenoid is at the maximum, the flow of power train hydraulic oil fully engages the clutch. The engagement of a clutch is proportional to the duty cycle of the signal sent by the ECM.

Note: The solenoid coils are not designed to operate using 24 DCV directly. The ECM sends a PWM signal of 24 V at a duty cycle that will provide the necessary current to the solenoid coils. Do NOT activate the coils by using 24 DCV (+battery). The life of the coils will be reduced drastically. A source of 12 DCV should be used, if the coils must be activated by not using the ECM.

AWD Drive Pump Solenoids



Illustration 27g03548618

The AWD drive pump solenoids are proportional solenoids valves that are designed to control the flow of hydraulic system pilot oil to adjust the position of the swash plates on the AWD pumps. There are two pumps, and a forward and reverse solenoid for each pump. When the solenoid is not engaged or receiving a low duty cycle signal, the solenoid does not allow pilot oil to shift the swash plate from maximum displacement. As the duty cycle of the signal to the solenoid increases, the solenoid allows some flow, and the swash plate is moved. When the duty cycle of the signal to the solenoid is at the maximum, the pilot oil shifts the swash plate to minimum displacement.

AWD Motor Solenoid



Illustration 28g03550296

The AWD motor solenoids are proportional solenoid valves that are designed to control the swash plate of the left or right motor. The solenoid allows for speed control of the motor. There are two solenoids, one for the left motor, one for the right motor. When the solenoid is not engaged or receiving a low duty cycle signal, the solenoid does not allow control oil to flow to the motor. As the duty cycle of the signal to the solenoid increases, control oil is allowed to flow to move the swash plate on the motor.

Data Link

Electronic communication between the Transmission / Chassis ECM, the Implement ECM, and the other control modules on the machine is conducted over data link circuits. The data link circuits allow the sharing of information with other electronic control modules. The data link circuits are bidirectional. The data link circuit allows the ECM to send information and to receive information.

The electronic communication system consists of two types of data link systems.

  • Cat Data Link

  • SAE J1939 (CAN) Data Link

The two types of data links are the main structure for communication between all of the control modules on the machine.

The SAE J1939 Data Link circuit is mostly used for faster operational communication between the control modules on the machine. The Cat Data Link is used for some of the internal communication that does not require the faster speeds and is used for communication with external devices such as the AVSpare Electronic Technician (Cat ET) service tool.

Cat Data Link

The Cat Data Link is an input/output of the ECM. The data link uses the connector for the service port in order to communicate with the AVSpare Electronic Technician. A data link connection is provided for the product link.

Note: The control for the product link provides a global positioning system for the machine.

The data link is bidirectional. The bidirectional link allows the ECM to input information and output information. The data link consists of the following parts: internal ECM circuits, the related harness wiring, the service tool connector and the connector for the product link. The Cat Data Link connects to the ECM at contact J1-10 (wire 893-GN(Green)) and contact J1-20 (wire 892-BR(Brown)).

  • The ECM receives commands from the Cat ET in order to change the operating modes. The Cat ET will read the service codes that are stored in the memory of the ECM. The Cat ET will clear the service codes that are stored in the memory of the ECM.

  • The ECM sends the input and the output information to the AVSpare ET.

Note: An electronic control module that uses the Cat Data Link will have a module identifier. The MID for the Machine Electronic Control Module is 039.

CAN Data Link

A data link is required for communication with the service tool (Cat ET) and the electronic control modules as well as instrument clusters and other devices that use this communications protocol. The data link is not used in order to broadcast any diagnostic information.

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