120H, 12H, 135H, 140H, 143H, 160H and 163H Motor Graders Electronic Control Module (Power Train) Caterpillar


Electronic Control Module (Power Train)
`
1.1. Inputs
2.1. Outputs
3.1. Input/Output



Illustration 1g00279578

Electronic Control Module (Power Train)

(1) Connector "J1"

(2) Connector "J2"

The electronic control module (ECM) is the main component of the Power Train Electronic Control system. The ECM makes decisions based on input information and memory information. Then, the corresponding response is made through the outputs. The inputs of the ECM and the outputs of the ECM are connected to the machine harness by two connectors. Both connectors have 40 contacts. There are no visual indicators on the ECM. Information for the Power Train Electronic Control System is shown on the AVSpare Monitoring System. The ECM sends the information to the AVSpare Monitoring System via the AVS data link.

Table 1
Contact Description Of Connector J1 For The Electronic Control Module (Power Train)    
Type     Function     No.    
Power     +Battery     1    
Ground     Ground     2    
Input/Output     AVS Data Link (−)     3    
Output     Transmission Solenoid (No. 1)     4    
Ground     Ground     5    
Power     +Battery     6    
Ground     Solenoid Return (No. 1)     7    
Output     Start Relay     8    
Input/Output     AVS Data Link +     9    
Output     Transmission Solenoid (No. 3)     10    
Output     Transmission Solenoid (No. 8)     11    
Output     Indicator (Automatic Shift)     12    
Input     Eighth Gear     13    
Ground     Return (Switch)     15    
Ground     Return (Sensor)     16    
Output     Transmission Solenoid (No. 2)     17    
Input     Seventh Gear     19    
Input     Third Gear     20    
Input     Location Code 1     21    
Input     Location Code 0     22    
Input     Sixth Gear     23    
Input     Second     24    
Input     "PARK"     25    
Input     Redundant "Neutral"     26    
Input     Limit Switch (Clutch Pedal)
(N/O)    
27    
Input     ECM Location Enable (+ Battery)     28    
Input     Fourth Gear     29    
Input     First Gear     30    
Input     Reverse     31    
Input     Autoshift Switch     32    
Input     Bypass Switch (Transmission Filter)     33    
Input     Fifth Gear     35    
Input     Limit Switch (Clutch pedal) (N/C)     36    
Input     Neutral     37    
Input     Location Code 2     38    
Input     Forward     39    
Input     Keyswitch     40    

Table 2
Contact Description Of Connector J2 For The Electronic Control Module (Power Train)    
Output     Transmission Solenoid (No. 6)     1    
Output     Transmission Solenoid (No. 7)     2    
Ground     Solenoid Return (No. 2)     3    
Input     Position Sensor (Clutch Pedal)     4    
Output     Transmission Solenoid (No. 4)     7    
Output     Transmission Solenoid (No. 5)     8    
Input     Transmission Temperature Sensor     10    
Input     − Transmission Output Speed Sensor (No. 1)     14    
Output     Indicator (Filter Bypass)     19    
Input     + Transmission Output Speed Sensor (No. 1)     20    
Input     − Transmission Output Speed Sensor     23    
Input     + Transmission INT Speed Sensor (No. 1)     24    
Input     + Transmission Output Speed Sensor (No. 2)     25    
Input     + Transmission Input Speed Sensor     29    
Input     − Transmission INT Speed Sensor (No. 2)     30    
Input     − Transmission Output Speed Sensor (No. 2)     31    
Input     − Transmission INT Speed Sensor (No. 1)     35    
Input     + Transmission INT Speed Sensor (No. 2)     36    
Output     Backup Alarm     37    

Inputs

Numerous inputs inform the ECM of the status of the conditions of the machine. Two types of inputs exist. There are switch inputs and there are sensor inputs. Switches provide an open signal, a grounded signal, or a +battery signal to the inputs of the ECM. Sensors provide a signal to the ECM that changes in a proportional manner in order to reflect changing machine conditions. The inputs are listed in the tables of Contact Descriptions.

Outputs

The power train ECM responds to decisions by sending electrical signals through the various outputs. The outputs are pulse width modulated. The ECM operates the PWM outputs in an on/off manner or in a proportional manner. This depends on the requirements of the output device. The outputs create an action or the outputs provide information. The outputs are listed in the tables of Contact Descriptions.

Input/Output

The AVS data link is bidirectional. The ECM can receive information and the ECM can send information. The data link communicates with other electronic control modules on the machine. The data link also communicates with service tools. The communication permits information to be shared. The data link is not a visible component. The data link consists of internal ECM circuits and the connecting harness wiring. For more information, see System Operation, "AVS Data Link".

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