5230B Excavator Machine Electronic Control System Electronic Control Module (ECM) Caterpillar


Electronic Control Module (ECM)
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1.1. Inputs
2.1. Outputs
3.1. Input/Output



Illustration 1g00386454

Machine Electronic Control Module

(1) Connector J1

(2) Connector J2

The machine electronic control module is the main component of the Machine Control System. Decisions are made by the circuits in the electronic control module. Software in the electronic control module activates the electronic circuits in the appropriate way to correctly operate the machine. Connectors join the harness wiring to the inputs and outputs of the electronic control module. There are two connectors with 40 contacts. Complete diagnostic codes are available with the ET. Other information is available with the monitoring system.

The electronic control module monitors the condition of the machine for proper system operation. Components sense the condition of the machine. Components then send electrical signals to the inputs of the electronic control module. The electronic control module compares the information from the inputs to the stored information. The electronic control module then decides if outputs should be activated. The activation is performed by sending electrical signals through the outputs to an electronic circuit.

Table 1
Contact Description    
No. (1)     Function     Type    
J1-1     +Battery     Power    
J1-2     -Battery     Ground    
J1-3     AVS Data Link -     AVS Data Link    
J1-4     Hydraulic Fan Solenoid     Output    
J1-5     -Battery     Ground    
J1-6     +Battery     Power    
J1-7     Solenoid Return     Solenoid Return    
J1-9     AVS Data Link +     AVS Data Link    
J1-11     Boom Float Relay     Output    
J1-12     Swing Pressure Solenoid     Output    
J1-13     Swing Pressure Switch     Switch to Ground    
J1-14     Travel Pressure Switch     Switch to Ground    
J1-15     Switch and Sensor Return     Switch and Sensor Ground    
J1-16     Switch and Sensor Return     Switch and Sensor Ground    
J1-17     Automatic Lubrication Relay     Output    
J1-18     Horn Solenoid     Output    
J1-19     Ladder Position     Switch to Ground    
J1-20     Travel Alarm Cancel Switch     Switch to Ground    
J1-21     Boom Float Pressure Switch     Switch to Ground    
J1-22     Position Switch (Service Center)     Switch to Ground    
J1-23     Bottom Dump Open Switch     Switch to Ground    
J1-24     Bottom Dump Close Switch     Switch to Ground    
J1-25     Horn Switch     Switch to Ground    
J1-29     Boom Raise Pilot Pressure Switch     Switch to Ground    
J1-30     Implement Pressure Switch     Switch to Ground    
J1-31     AESC Enable Switch     Switch to Ground    
J1-33     Harness Code Contact 5     Switch to Ground    
J1-35     Boom Float Switch (No. 3)     Switch to Ground    
J1-36     Harness Code Contact 1     Switch to Ground    
J1-37     Harness Code Contact 2     Switch to Ground    
J1-38     Harness Code Contact 3     Switch to Ground    
J1-39     Harness Code Contact 4     Switch to Ground    
J1-40     Key Switch Input     Switch to Battery    
( 1 ) The connector contacts that are not listed in the table are not used. The connector has 40 contacts.

Table 2
Contact Description    
No. (1)     Function     Type    
J2-1     Swing Brake Solenoid     Solenoid Output 6    
J2-2     Dual Pressure Relief Solenoid     Solenoid Output 8    
J2-3     Solenoid Return     Solenoid Return    
J2-4     Hydraulic Oil Temperature Sensor     PWM    
J2-6     Automatic Lubrication Pressure     PWM    
J2-7     Travel Brake Solenoid     Solenoid Output 5    
J2-8     Cooler Shutoff Solenoid     Solenoid Output 7    
J2-12     Power Supply (8 DCV)     Sensor Power    
J2-13     Bottom Dump Open Solenoid     Solenoid Output 10    
J2-14     Swing Pressure Sensor     Switch to Ground    
J2-19     Bottom Dump Close Solenoid     Solenoid Output 9    
J2-20     Swing Pressure Sensor Return     Return    
J2-22     AESC Control Line     Fault Output 3    
J2-23     Pressure Sensor (Implement)     PWM    
J2-24     Swing Brake Pressure Sensor (Return)     Return    
J2-29     Implement Pressure Sensor Return     Return    
J2-35     Pressure Sensor (Swing Brake)     PWM    
J2-37     Travel Alarm     Solenoid Output 14    
J2-38     Speed Sensor (Swing Motor)     Frequency    
( 1 ) The connector contacts that are not listed in the table are not used. The connector has 40 contacts.

Inputs

Numerous inputs from the electronic control module monitor the machine's condition. Two types of inputs exist. One type of input is the switch input. The other input device is a sensor. Switches and harness wiring provide signals to the switch inputs of the electronic control module. These inputs include the items that are listed here:open circuit, short to +battery and short to ground. Sensors provide a constantly changing signal to the sensor input of the electronic control module.

Outputs

The electronic control module responds to decisions by sending electrical signals through various outputs. The outputs can cause one of the items that follow.

  • Create an action.

  • Provide information to other devices.

  • Supply sensor power.

Input/Output

The AVS Data Link is used to communicate with a service tool or other electronic control modules. The data link is bidirectional. Bidirectional communication allows sharing of information.

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