PLATE-CLUTCH 7G1968 - Caterpillar

System Operation Description:Use this procedure under the following circumstances:
Diagnostic code 1743-02 is active.
The switch cannot be switched to ground.
The mode switch does not operate correctly.Also, use this procedure if another procedure has directed you here.The mode switch provides the operator with the ability to select a maximum of eight different modes of operation. Different modes of operation can be used in a particular situation by giving the operator a means to select the most efficient method of completing the required work. The following mode selections are available:
Economy Mode
Machine Mode
Power Take-off ModeThree digital switch inputs can be used in order to select the most efficient mode. With three switches, a maximum of eight modes can be applied by use of a multiple position switch. With two switches, four modes can be selected.With one switch, two modes can be selected.Each mode has a single fuel limit map, a rated speed, and a matched fuel delivery. Each mode also has specific droop value for throttle 1 and throttle 2.Test Step 1. Inspect Electrical Connectors and Wiring
Illustration 1 g01332012
Schematic for the mode switch (31 pin MIC)
Illustration 2 g01332011
Schematic for the mode switches (70 pin MIC)
Illustration 3 g01625533
ECM pin locations for the mode switches
(9) Mode switch No. 3 (if equipped)
(21) Mode switch No. 2 (if equipped)
(30) Mode switch No. 1
(37) Switch return
Illustration 4 g01625534
Pin locations for the mode switch (31 pin MIC)
(26) Mode switch No. 1
(28) Switch return
Illustration 5 g01332010
Pin locations for the mode switches (70 pin MIC)
(9) Mode switch No. 3
(21) Mode switch No. 2
(30) Mode switch No. 1
(37) Switch return
Turn the keyswitch OFF.
Thoroughly inspect J1/P1 ECM connector and the J20/P20 MIC. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the P1/J1 ECM connector and the P20/J20 MIC that are associated with the mode switch. Refer to illustration 1 or 2.
Check the Allen head screw on the J1/P1 ECM connector for the correct torque of 6.0 N m (55 lb in).
Check the harness and wiring 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 wiring and/or replace the connectors or wiring. Ensure that all of the seals are correctly installed and ensure that the connectors are completely coupled.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 Mode Selector Switch
Turn the keyswitch to the OFF position.
Disconnect the harness connector from the mode selector switch.
Install a jumper wire between the suspect terminal on the mode selector switch and the terminal for the switch return.
Turn the keyswitch to the ON position.
Monitor the status screen on the electronic service tool.
Slowly disconnect the jumper wire and then reconnect the jumper wire on the suspect terminal on the mode selector switch. Expected Result:When the jumper wire is disconnected, the switch should be in the OPEN position.When the jumper wire is connected, the switch should be in the