Case IH 55011 – Engine Control Unit (ECU) / Aftertreatment Control Module: Hydrocarbon Injection (HCI) Pump Malfunction

This code indicates a malfunction regarding the Hydrocarbon Injection (HCI) pump, which is part of the exhaust aftertreatment/emissions system. FMI 9 indicates communication failure, FMI 15 indicates high temperature, and FMI 31 indicates abnormal status.

• STX Steiger
• LUXXUM series
• PUMA
• combines utilizing SCR/DPF systems

1. 1

   For FMI 9 (Communication): Check the CAN bus wiring harness connecting the ECU to the HCI pump for opens, shorts, or high resistance.

2. 2

   For FMI 15 (High Temp): Inspect the HCI pump/doser for exposure to excessive exhaust heat, check coolant/cooling lines routed to the doser, and ensure there are no exhaust leaks blowing directly onto the pump.

3. 3

   Verify power and ground pins at the HCI pump connector.

1. 1

   Disconnect battery

   Disconnect the battery before servicing the aftertreatment system.

2. 2

   Inspect wiring harness

   Inspect the wiring harness leading to the HCI pump. Repair any chafed wires or corroded pins.

3. 3

   Clear debris and check dosing block

   If FMI 15 is present, clear any debris blocking cooling to the pump and verify the dosing block isn't clogged with soot/crystallized fluid.

4. 4

   Diagnose internal circuitry failure

   If wiring and cooling are intact but the code persists (especially FMI 31 or 9), the internal circuitry of the HCI pump has likely failed.

5. 5

   Replace HCI pump

   Unbolt the HCI pump from its mounting bracket, disconnect the fuel/fluid lines, and install a replacement pump.

6. 6

   Clear code and test

   Reconnect the battery and use a diagnostic tool to clear the code and run an aftertreatment dosing test to verify the repair.