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Diesel Common Rail Testing


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Spill Test, Rise Time, Proof Test, Decay Test
The four common tests for hydraulic operation that can be done on a Common Rail System
Spill Test
Using leak off pipes to measure leakage and spill
10
Injectors are to be within ___% of each other during the spill test
Plausibility Value
The name of the voltage at the rail pressure sensor with KOEO
Rise Time
Time for the rail pressure to achieve starting / maximum pressure
1 300
Rise time for early diesels should be less then ___ s, newer diesels less then ____ ms
Priming Pump Suction Pressure
Aggressive rise time with smooth idle rail pressure means _____ system and _____ are good also _____ and ______ valves
Proof Test
Checking maximum pump pressure achievable
Suction Pressure
To Proof test a pump we disconnect the ______ valve and ground the ______ valve if available
Depress 4.5
To achieve full pressure on Proof test we need to ______ throttle, so rail voltage should make ____ V
Open Volume
Suction valve circuit when _____, closes return off to allow full ______ flow
Activated, Ground
For proof test - Pressure valve or DRV nees to be fully _____ so we ___ the signal pin from the PCM
Decay Test
Test to determine leakage in the pressure system (injectors, returns or pump)
Peak Proof Plausibility
Decay test measures the time taken from the ____ of the _____ test to the _______ value
10 15
Standard bosch Decay Test time is between ___ to ___ secs
Longer Tight
_____ decay time shows a more hydraulically ____ system.
Trim Spill
Delphi injectors can be pulsed to ___ the rail pressure through their ___ port, bleeds fuel for more precise rail pressure control
5 10
Disconnecting injectors minimises spill to about __ml per injector over __seconds of cranking