CORE A.-RAD. 1S5143 - Caterpillar

Illustration 1 g03333081
Schematic of transmission direction and speed control leverThis diagnostic code is recorded when the power train ECM records an erratic, intermittent, or incorrect signal from the transmission direction and speed control lever.Note: Before troubleshooting one of these diagnostic codes, move the transmission direction and speed control lever through all positions. Ensure that the diagnostic code that is being analyzed is on hold.Refer to test steps in Testing and Adjusting, RENR6425, "Transmission Control (Shift Lever) - Test", and troubleshoot the following:
Harness and connectors for the transmission direction and speed control lever
Power Supply to the transmission direction and speed control lever
Continuity across transmission direction and speed control lever contacts
Gear lever parameters using Cat ETIf the problem is not found, after following the test steps in Testing and Adjusting, RENR6425, "Transmission Control (Shift Lever) - Test", continue troubleshooting using the below test steps:Note: Table 1 contains wire numbers and connector contacts. Use this information to troubleshoot the failed circuit.
Table 1
Status for the Transmission Direction and Speed Control Lever    
Switch
Position     J1-30     J1-14                
Forward     Closed     Open                
Reverse     Open     Closed                
Switch
Position     J1-19     J1-23     J1-25     J1-26     J1-13    
First Gear     Closed     Open     Open     Open     Open    
Second Gear     Open     Closed     Open     Open     Open    
Third Gear     Open     Open     Closed     Open     Open    
Fourth Gear     Open     Open     Open     Closed     Open    
Neutral     Open     Open     Open     Open     Closed    Test Step 1. CHECK FOR OPEN CIRCUIT
Turn the keyswitch to the OFF position.
Turn the disconnect switch to the OFF position.
Disconnect the harness from the ECM.
Activate the switch. At the harness connector for the ECM, check the resistance to ground of the normally closed contacts and the normally open contacts.Expected Result:The resistance check does not agree with Table 1.Results:
YES - The resistance check does not agree with the preceding table. Proceed to test step 2.
NO - The resistance agrees with the values in the preceding table. Proceed to test step 3.Test Step 2. CHECK THE SWITCH
Disconnect the harness from the switch.
At the switch harness, check the resistance to ground of the normally closed contacts and the normally open contacts. Activate the switch when this check is being performed.Expected Result:The resistance check does not agree with the values in Table 1.Results:
YES - The resistance check does not agree with the preceding table.Repair: The switch or the switch harness has failed. Repair the switch or replace the switch.STOP
NO - The resistance check agrees with the preceding table. Proceed to test step 3.Test Step 3. CHECK FOR A SHORT
Check the resistance from each switch contact at the harness connector for the ECM to all other contacts in J1 and J2.Expected Result:The resistance is less than 5 ohms.Results:
YES - The resistance is less than