Electronic Service Tool (EST) – Tier IV SCR Diagnostic and Urea Dosing System Manual

This manual details the use and diagnostic functions of the Electronic Service Tool (EST) for Tier IV SCR (Selective Catalytic Reduction) engines. It provides comprehensive operational instructions for technicians working on DCU15 (Denoxitronic Control Unit) and ECM (Engine Control Module) systems within CNH equipment.
The guide also includes urea system testing, controller configuration, derate reset, and troubleshooting logic for FPT NEF and Cursor engines equipped with AdBlue/DEF injection systems.
It supports the following machine families:

• CASE and New Holland Construction models with Tier IV SCR systems

• Agricultural and industrial equipment using FPT DCU15 controllers

Coverage

• Controller Status

  • Displaying connected controllers (DCU15, ECM)

  • Hardware/software version retrieval

  • Communication verification and version file saving

• Monitor

  • CAN diagnostic parameter selection

  • Adding, saving, and viewing real-time SCR parameters

  • Example Tier IV SCR monitoring list

• Programming

  • DCU15 setup and dataset selection

  • Download approval and password authorization

  • Program upload process and verification steps

• Additional Tools

  • Easy Engine Diagnostic Tool (Tier IV DCU15)

  • Warnings on EASY instability

  • Functionality identical to NEF/CURSOR diagnostic tools

• Configuration

  • Model-specific controller calibration

  • Engine Derate Status view

  • Engine Restart Counter Reset procedure

• Engine Derate Status

  • Real-time NOx monitoring and derate logic

  • Typical NOx sensor range (500 ppm static → 250 ppm operating)

  • eVGT, turbo speed, and control mode indicators

• Engine Restart Counter Reset

  • Emergency restart logic (three resets allowed)

  • Torque and RPM limit reinstatement procedure

• Controller Tests

  • Overview of SCR diagnostic tests:

    • Urea Dosing System Test (UDST)

    • Urea System Emptying Routine

    • Urea Flushing Routine

• UDST (Urea Dosing System Test)

  • Static test (engine off) with 11 validation points

  • Pump speed, pressure, and injection performance graphs

  • Acceptable ranges:

    • Pump speed: 1800–3600 rpm

    • Pump pressure: 4900–6200 mbar

    • Throttle pressure: 1500–4300 mbar

    • Injection pressure drop: >100 mbar

    • Vacuum test: –50 to –300 mbar

• Urea System Emptying Routine

  • Simulation of post-shutdown DEF purge

  • Leak detection and pressure decay verification

• Urea System Flushing Routine

  • Line cleaning process without injection

  • Used after SCR disassembly or service

• SCR System Troubleshooting

  • Air in urea system

  • Leakage and low injection

  • High-pressure part failures

  • Pressure line clogging

  • Pump malfunction

  • Reverting valve defect

  • Obstructed throttle and reversed lines

Delivery

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