Common Rail Injector Tests

Written by dr. samuel helms
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Common Rail Injector Tests
Diesel engine with injector system (engine image by goce risteski from

There are a number of common-rail injector test stands available to auto repair shops. The important considerations for a test stand are the types of injectors it can test, the maximum pressure (in bars) of the fuel system and the type of diagnostics. Some test stands include preprogrammed test plans to help the mechanic analyse the problem.

HK900 and AVM2-PC

The HK900 from Hartridge is an additional test for the AVM2-PC common rail test stand also made by Hartridge. The HK900 can test as many as four fuel injectors at a time for variables such as coil resistance and injector response times. It also includes software that analyses the test against preprogrammed test plans. The HK900 and AVM2-PC can test injectors made by Bosch, Delphi, Denso and Siemens. Care must be taken when hooking up the unit as the high pressures in the engine can cause caps and lines to blow off.

JH 1000

Taian Jinhai Dongshan (JHDS) makes a battery common rail injector tester called the JH 1000. The JH 1000 tests diesel fuel delivery and spray patterns of common rail injectors. The system can use compressed air to deliver high pressure fuel to the system and works with solenoid and piezoelectric actuators. It also includes an ultrasonic cleaner to remove particulate matter from the injectors.

Indian Machine Tools

Indian Machine Tools makes a common rail diesel fuel injector tester that also works with Bosch, Delphi, Denso and Siemens fuel injectors. This system can handle up to 5,000rpm, whereas many others go up to only 4,000rpm. The test stand can test an individual injector for spray pattern and fuel delivery, as well as chattering and back leakage.

CRI 100

The CRI 100 can test Bosch, Denso and Delphi but not Siemens injectors. The CRI 100 can adjust the supply voltage up to 2,000 bar. The unit can also clean the injectors with sonic waves or high pressures, whereas the JH 1000 uses only ultrasonic sound waves.

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