Symptom : No start situation, engine cranking
Repair History : This vehicle has a checkered past, less than 5,000 k’s ago, the vehicle was filled with on site drum fuel and subsequently had drivability issues, the on site technician had emptied and cleaned the fuel tank, replaced the fuel filter, replaced the suction control valve and replaced and programmed the injectors.
4-5 months and 5,000k’s later the vehicle broke down and would not restart, the on site technician had exhausted his diagnostic abilities and the vehicle was towed to Gary’s workshop.
When Foxwell arrived at Gary’s (one of local customers / friends) he mentioned that he was unable to rule in / out faults without measuring the rail pressure. So we stepped in with the CRD700 and the NT644, apowerful CRD Diagnostic Tool Combination.
The first test we did with the Foxwell CRD700 was to measure the CRD Rail Pressure to confirm the accuracy of the Rail Pressure Sensor, this was done to rule out the sensor, its wiring and the ECU’s interpretation of that data. IE, is the information being displayed in the live data accurate.
The Foxwell CRD700 high pressure tester was installed on the vehicle with a using the fitting kit T piece, the M12 / M12 flexible high pressure hose and one the vehicles existing fuel pressure lines.
Using the Data Graphing Function of the NT644 Automaster Pro, we compared the graphed Rail Pressure 10,000 kpa / 100 bar with the measurement taking using the CRD700.
A CRD VEHICLE NEEDS ON AVERAGE 350 BAR / 35,000 KPA TO START.With the two measurements confirmed and the vehicles rail pressure deemed to be accurate, we needed to know why the rail pressure was low. With Gary having eliminated the pre delivery side from the equation, and with no leaks between the pump and injectors we needed to rule in / out the injector pump itself. We did this by doing a maximum pressure test, where the CRD700 pressure sensor is fitted directly to the high pressure out put of the injector pump.
rELATION TOOLS USED