IT38G Series II Integrated Toolcarrier and 938G Series II Wheel Loader Connector Contact Description Caterpillar


Connector Contact Description
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1.1. Inputs
2.1. Outputs
3.1. Input/Output



Illustration 1g00918434

(1) Connector J1

(2) Connector J2

(3) In order to remove the harness from the ECM, use screw (3) in the center of the harness connector.

The Power Train ECM makes decisions based on the information from inputs and information from memory. After the Power Train ECM receives the information from inputs and information from memory, the Power Train ECM will send a corresponding response through the outputs. The inputs and outputs of the Power Train ECM connect to the machine harness by two 40-pin connectors (J1 and J2).

Inputs

The machine has several input devices. The Power Train ECM receives information from components about machine operations. The machine has switch-type inputs and sensor-type inputs. 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 a signal to the ECM that constantly changes. The inputs to the Power Train ECM are listed in the two tables for the 40-pin connector.

Outputs

The Power Train ECM sends electrical signals through the outputs. The outputs can create an action or the outputs can provide information to the Power Train ECM. The outputs for the Power Train ECM are listed in the two tables for the 40-pin connector.

Input/Output

The engine ECM and the Power Train ECM use the AVS data link in order to communicate with each other. The data link is bidirectional. The data link allows the ECM to receive information. The data link allows the ECM to send information. The data link allows the sharing of information with other electronic control modules.

The Power Train ECM and the instrument panel use the CAN data link to communicate with each other. The data link is bidirectional. The data link allows the ECM to receive information. The data link allows the ECM to send information. Engine information that needs to be displayed on the instrument panel is transmitted to the Power Train ECM on the AVS data link. Then, the Powertrain ECM sends the information to the instrument panel on the CAN data link.

For more information on the data links, see Systems Operation, "Data Link".

A module identifier (MID) is assigned to each ECM. The MID for the Power Train ECM is the number 081.

Table 1
Contact Description for the Power Train ECM J1    
No. (1)     Function     Type    
1     +Battery     +Battery    
2     Ground     Ground    
3     AVS Data Link -     AVS Data Link -    
4     Clutch 3 (Reverse)     Solenoid Output    
5     Ground     Ground    
6     +Battery     +Battery    
7     Solenoid Return     Solenoid Return    
8     Start Relay     Solenoid Output    
9     AVS Data Link +     AVS Data Link +    
11     Clutch 1 (FWD Low)     Solenoid Output    
12     Ride Control Solenoid #2     Solenoid Output    
13     Direction Switch (Neutral)     Switch To Ground    
14     Direction Switch (Reverse)     Switch To Ground    
15     Switch/Sensor Return     Switch/Sensor Return    
16     Switch/Sensor Return     Switch/Sensor Return    
17     Clutch 2 (FWD High)     Solenoid Output    
18     Ride Control Solenoid #1     Solenoid Output    
19     1st Gear Switch)     Switch To Ground    
20     VSC #1 (Minimum)     Switch To Ground    
21     Ride Control Switch #1     Switch To Ground    
22     Ride Control Switch #2     Switch To Ground    
23     2nd Gear Switch     Switch To Ground    
24     VSC #2 (Medium)     Switch To Ground    
25     3rd Gear Switch     Switch To Ground    
26     4th Gear Switch     Switch To Ground    
27     Park Brake Switch (N/C)     Switch To Ground    
29     Auto/Man Switch (Manual)     Switch To Ground    
30     Direction Switch (Forward)     Switch To Ground    
31     Auto/Man Switch (Auto 4)     Switch To Ground    
32     Implement Kickout Switch     Switch To Ground    
34     Neutralizer Disable Switch     Switch To Battery 2    
35     Auto/Man Switch (Auto 1-4)     Switch To Ground    
36     Park Brake Switch (N/O)     Switch To Ground    
37     Secondary Steer Test Switch     Switch To Ground    
38     Secondary Steer Pressure Switch (N/C)     Switch To Ground    
39     VSC #3 (Maximum)     Switch To Ground    
40     Key Start Switch To B+     Switch To Battery 1    
( 1 ) The connector contacts that are not listed are not used. The connector has 40 contacts.

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Table 2
Contact Description for the Power Train ECM J2    
No. (1)     Function     Type    
1     Clutch 5 (Speed 3)     Solenoid Output    
2     Clutch 6 (Speed 1)     Solenoid Output    
3     Solenoid Return     Solenoid Return    
4     Left Brake Pedal Sensor     Switch To Ground/PWM    
5     Downshift (N/O)     Switch To Ground/PWM    
6     Primary Steer Pressure Switch (N/C)     Switch To Ground/PWM    
7     Secondary Steering Relay)     Solenoid Output    
8     Clutch 4 (Speed 2)     Solenoid Output    
10     Primary Steer Pressure Switch (N/O)     Switch To Ground/PWM    
11     Secondary Steer Pressure Switch (N/O)     Switch To Ground/PWM    
12     Sensor Supply +8 Volts     Sensor Supply +8 Volts    
13     Implement Aux/Float Detent     Solenoid Output    
14     Output Speed -     Frequency Input -    
18     Transmission Oil Temperature     Switch To Ground/PWM    
19     Implement Lift/Tilt Detent     Solenoid Output    
20     Output Speed +     Frequency Input +    
23     Input Speed -     Frequency Input -    
24     Intermediate Speed +     Frequency Input +    
25     Output Speed Q+     Frequency Input Q+    
29     Input Speed +     Frequency Input +    
30     Intermediate Speed Q-     Frequency Input Q-    
31     Output Speed Q-     Frequency Input Q-    
( 1 ) The connector contacts that are not listed are not used. The connector has 40 contacts.

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