CAB AS 3684400 - Caterpillar

Use this procedure to check if the mode selector switch operates correctly.The mode selector 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 an open or short circuit condition occurs in the circuit for switch 1 or switch 2, the mode of operation will be different to the mode that was selected by the operator. If the mode of operation is not enabled on the application, a 2882-2 diagnostic code will become active.
Illustration 1 g02129713
Typical schematic for the mode selector switches
Illustration 2 g02129720
View of the pin locations on the P1 connector for the circuit for mode selection
(62) Mode switch 1
(64) Mode switch 2 Test Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch OFF.
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.
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.
Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
Check the harness for abrasions and for pinch points from the battery to the ECM. Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are correctly connected.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOP
- If the fault has not been eliminated proceed to Test Step 2.Test Step 2. Check the Status of the Mode Selector Switch
Turn the keyswitch to the OFF position.
Connect the electronic service tool to the diagnostic connector.
Turn the keyswitch to the ON position.
Monitor the status screen on the electronic service tool. Cycle the mode switch to the ON position and to the OFF position. Results:
The switch status changes as you cycle the mode switches. When the switch is in the OFF position, the switch is open. When the switch is in the ON position, the switch is closed. - Repair: Verify that the status of the switch changes as the switch is cycled. STOP
The switch status does not change as you cycle the mode switches - There is a fault with the circuit for the mode selector switch. Proceed to Test Step 3.Test Step 3. Insert a Jumper at the Suspect Mode Switch
Turn the keyswitch to the OFF position.
Perform the following procedure to test