Fuel Rail Pump Solenoid Test using CAT ET Software

How to perform: Fuel Rail Pump Solenoid Test using Cat ET software?
Purpose:
The high-pressure fuel pump contains two assemblies for pressurizing fuel. Each assembly contains a solenoid. This test checks each solenoid to make sure that the solenoids are working properly.

-Connect CAT ET Software
Read More: How to Connect Caterpillar ET Software from your Laptop to ECM
-Open Menu: “Diagnostic”- “Diagnostic Test” – “Fuel Rail Pump Solenoid Test”

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-Click on “Power All” or “Start” and wait the process until completed (Mode: powered)
-On tab “Test Results” is Not OK (*Short), indicates that the Fuel Rail Pump Solenoid is damaged/shorted.

NOTE:
-This test identifies an open circuit or a short circuit for the Fuel Rail Pump Solenoid. The test activates the solenoid while the engine is not running. A good solenoid will create an audible click when the solenoid is activated. CAT ET indicates the status of the solenoid as “OK”, “Open”,or “Not OK (*Short)”.

Test Operation:
During the Fuel Rail Pump Solenoid Test, the ECM pulses 105-volt to each solenoid. The pulses are sent at the proper time and for the correct duration for a given engine load and speed. The ECM monitors the current flow through the circuit for each solenoid. If the current flow is too high or too low, the ECM activates one of the following diagnostic codes:

1779-5 Fuel Rail Pump #1 Output Current Below Normal
1779-6 Fuel Rail Pump #1 Output Current Above Normal
1780-5 Fuel Rail Pump #2 Output Current Below Normal
1780-6 Fuel Rail Pump #2 Output Current Above Normal

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