TORQUE CONVERTER GP 3221553 - Caterpillar

Pre-Priming
The first part of the test simulates what the system normally checks prior to normal dosing operation, but does not require the engine to be running.This part of the test can also be ran with the engine running.Successful completion is required to advance to the next part of the test.Refer to System Operation, "Dosing Control System Operation" for further information.Pump on Dosing Check
After successfully completing, the pre-priming part of the test the user has the option of running the pump on dosing check.If the user elects to proceed, the test will automatically start when the predetermined conditions for the following are met:
Engine speed
Exhaust temperature