RING-BACKUP 1211372 - Caterpillar

System Operation Description:Use this procedure under the following circumstances:
Diagnostic code 1743-02 has been generated.
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 in a particular situation by 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.For C4.4 engines, refer to table 1 for a list of examples of different modes of operation.For C6.6 engines, refer to table 2 for a list of examples of different modes of operation. Refer to table 3 for a list of mode switch connections.
Table 1
Switch 2     Switch 1     Mode Number     C4.4 Engine Rating     Droop (%) (1)    
Throttle 1 Throttle 2 Torque Speed Control
Open     Open     1     80 KW @ 2200 RPM     10     10     10    
Open     Closed     2     80 KW @ 2200 RPM     5     2     0    
Closed     Open     3     100 KW @2200 RPM     10     10     10    
Closed     Closed     4     100 KW @ 2200 RPM     5     5     0    
( 1 ) Throttle droop can be configured in 1% increments.
Table 2
Switch 2     Switch 1     Mode Number     C6.6 Engine Rating     Droop (%) (1)    
Throttle 1 Throttle 2 Torque Speed Control
Open     Open     1     100 KW @ 2200 RPM     10     10     10    
Open     Closed     2     100 KW @ 2200 RPM     5     2     0    
Closed     Open     3     120 KW @2200 RPM     10     10     10    
Closed     Closed     4     120 KW @ 2200 RPM     5     5     0    
( 1 ) Throttle droop can be configured in 1% increments.
Table 3
Function     P1 Connector Pin Assignment    
Mode Switch 1     39    
Mode Switch 2     46    
Switch return (Ground)     35    
Illustration 1 g01805358
Typical schematic for the mode selector switches
Illustration 2 g01805359
View of the pin locations on the P1 connector for the circuit for mode selection (35) Mode switch return (GND) (39) Mode switch 1 (46) Mode switch 2Test 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 5.0 N m (44 lb in).
Check the harness for abrasions and for pinch points