ELECTRICAL AR 3865896 - Caterpillar

Table 1
Diagnostic Trouble Code for the Mode Selection Switch
J1939 Code CDL Code Code Description
(code descriptions may vary) Comments
2882-2 1743-2 Engine Alternate Rating Select : Erratic, Intermittent, or Incorrect The Electronic Control Module (ECM) detects a combination of switch positions for the mode switches that has not been defined.
If equipped, the warning lamp will come on and the ECM will log the diagnostic code.
The ECM will return the engine to the last good mode selection or setting.
The engine will start and the engine will default to the previous mode selection. The engine may operate at reduced speed or reduced power depending on the mode that is selected.
Follow the troubleshooting procedure in order to identify the root cause of the fault. Use this procedure to check if the mode selection switch operates correctly.The mode selection switch inputs provide the operator with the ability to select a maximum of four different modes of operation. Different modes of operation can be used giving the operator a means to select the most efficient method of completing the required work.Each mode has a single fuel limit map, a rated speed, and a matched fuel delivery. Each mode also has a specific droop value for throttle 1 and throttle 2.
Table 2
Mode Number Switch 2 Switch 1 Enabled
1 Open Open Y/N
2 Open Closed Y/N
3 Closed Open Y/N
4 Closed Closed Y/N If a fault occurs in the circuit for either of the switches, the mode of operation will be different to the mode that was selected. If the mode of operation is not enabled on the application, a 2882-2 or 1743-2 diagnostic code will become active.During the following procedure, refer to the electrical schematic for the application.Complete the procedure in the order in which the steps are listed.
Table 3
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch OFF.
B. Thoroughly inspect the P1 connector. Thoroughly inspect the mode switch connectors, plugs, and interconnections on the harness. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the wires in the P1 connector that are associated with the mode selector switches.
D. Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
E. Check the harness for abrasions and for pinch points from the mode section switches to the ECM.
Loose connection or damaged wire
Result: There is a fault in a connector or the wiring.
Repair: Repair any faulty connectors or replace the wiring harness. Ensure that all of the seals are properly in place and ensure that the connectors are correctly coupled.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points.
Proceed to Test Step 2.
2. Check the Status of the Mode Selection Switch
A. Turn the