COVER 3456024 - Caterpillar

Illustration 1 g01451492
Connections of the reduced rimpull switch
Table 1
Status of Reduced Rimpull Switch
Switch Position Switch 1
J2-36 Switch 2
J2-37 Switch 3
J2-39 Switch 4
J2-38
1 Closed Open Open Open
2 Open Closed Open Open
3 Open Open Closed Open
4 Open Open Open Closed The reduced rimpull switch has four inputs to the ECM. During normal operation, three of the inputs are open and the other input is grounded. The diagnostic code is detected when all of the inputs are open or shorted to the +battery. Before you perform this procedure use Table 1 to determine the connector and the contacts that correspond to the problem circuit. The diagnostic code is set in five seconds and the diagnostic code is cleared in one second.Possible causes of this diagnostic code are listed:
There is a problem in the harness.
The switch failed.System Response:The machine response is listed:
Reduced rimpull is disabled.Test Step 1. CHECK FOR AN OPEN CIRCUIT.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness connectors J1 and J2 from the ECM.
At the machine harness connector for the ECM, check the continuity to ground of the switch contacts with the reduced rimpull switch that is activated and with the reduced rimpull switch that is not activated. Refer to Table 1 for the correct status of the reduced rimpull switch. Expected Result:The continuity check does not agree with Table 1.Results:
YES - The continuity check does not agree with the information in the table. The harness or the reduced rimpull switch is faulty. Proceed to Test Step 2.
NO - The continuity check agrees with the information in the table. Proceed to Test Step 3.Test Step 2. CHECK THE SWITCH.
Disconnect the machine harness from the reduced rimpull switch.
Check the continuity to ground of the switch contacts with the reduced rimpull switch that is activated and with the reduced rimpull switch that is not activated. Refer to Table 1 for the correct status of the reduced rimpull switch. Expected Result:The continuity check does NOT agree with Table 1.Results:
YES - The continuity check does NOT agree with the information in the table. The reduced rimpull switch is malfunctioning.Repair: Repair the switch or replace the switch.STOP
NO - The continuity check agrees with the information in the table.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK FOR A SHORT TO +BATTERY
At the machine harness connector J1 for the ECM, check the continuity from each of the wires for the switch contact to all sources of positive voltage. Expected Result:Continuity exists between one of the sources of the battery voltage and the switch circuit.Results:
YES - Continuity exists between one of the sources of battery voltage. The machine harness is faulty.Repair: Repair the machine harness or replace the machine harness.STOP
NO - Continuity does not exist between one of the sources of battery voltage and the switch circuit. The machine harness is correct. It is