Fault Detection / Management
The Diagnostic Trouble Codes (DTCs) associated with this system may indicate an electrical or electronic control system failure, but will most
likely indicate a mechanical or hydraulic problem with the ICP system.
The ECM continuously monitors the ICP in the system to assure the control system is providing the proper control pressure at all times. If the oil pressure feedback provided by the ICP sensor does not meet ECM desired values, the ECM will set a DTC, illuminate the amber engine lamp and control the operation of the ICP system by calculating the
correct oil pressure for all engine operating conditions until the system is diagnosed and repaired.
The ECM monitors the injection control pressure developed while the engine is cranking. When pressure does not develop in an expected time frame, the ECM will set a DTC. The DTC will aid in identifying and diagnosing the hard start and no start condition.
The EST can be used to command the ECM to perform an engine running test on the ICP system.
The ECM controls the IPR in a programmed sequence and evaluates system performance. When the test concludes, if a performance issue has been detected, the ECM will set a DTC for that system condition.
When an ICP fault is detected, the ECM will default to open loop of IPR control and the Electronic Service Tool (EST) will display N/A on ICP data. ICP desired will indicate default pressure.
ICP System Diagnostic Trouble Codes (DTCs)
DTCs are read using the EST or by counting the flashes from the amber and red ENGINE lamp.
NOTE: Repair all injector, sensor, and actuator DTCs before doing ICP diagnostic checks and tests. See “Injection Control Pressure (ICP) System Components and High-Pressure Oil Flow” – Section 1 (page 27) for additional information.
NOTE: Engine brake components need to be considered during ICP diagnostics. See “Injection Control Pressure (ICP) System Components and High-Pressure Oil Flow” – Section 1 (page 27) for additional information.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
