HARNESS AS 1893270 - Caterpillar

The Retarder Will Not Engage
Possible Cause
The control switch for the retarder is not functioning correctly.
Check the operation of the control switch for the retarder. Refer to Systems Operation, Testing and Adjusting, "Retarder - Test" and refer to Systems Operation, Troubleshooting, Testing and Adjusting, RENR8035, "Power Train Electronic Control System".
The wiring harness for the power train may be damaged.
Check the wiring and check the connector for damage. Refer to Systems Operation, Testing and Adjusting, "Visual Inspection".
Repair any damage that is found in the wiring harness, or replace any loose connections that are found.
The hoses or the lines in the power train hydraulic system may be damaged.
Inspect the condition of the lines. Refer to Systems Operation, Testing and Adjusting, "Visual Inspection".
The power train oil level is lower than the specification.
Check the power train oil level. Refer to Systems Operation,Testing and Adjusting, "Visual Inspection".
Check the pressures in the power train. Refer to Systems Operation, Testing and Adjusting, "Power Train Pressures".
There is debris and damaged components in the power train.
Inspect the oil filter for debris.
Determine the origin of the debris and repair the damaged component.
Change the oil in the power train and install a new oil filter.
There may not be sufficient pressure at the retarder actuation valve.
Check the pressure of the oil in the retarder actuation valve. Refer to Systems Operation, Testing and Adjusting, "Retarder - Test".
There may not be sufficient pressure at