SPN 729 - FMI 4 (Fault Code: Intake Air Heater 1 Circuit - Voltage Below Normal or Shorted to Low Source)

SPN 729 FMI 4

SPN729 FMI4 (Cummins QSB3.3)

Figure 1.1 - Intake Air Heater Shorted (SPN 729 - FMI 4)

SPN 729 - FMI 4

Intake Air Heater 1 Circuit - Voltage Below Normal or Shorted to Low Source

Here the STEPS:

1). Connecting Adapter Tools (Nexiq USB-Link) to diagnostic port on Cummins Engine. Read More: How to Connecting CUMMINS Engines using Cummins INSITE Software.

2). Once connected to the ECM, open Fault Codes on the left-side menu to check Active/Inactive Codes - Status.

Figure 1.2 - Fault Code 2556 (Active)

Figure 1.3 - Displays the Fault Code 2556

3). Troubleshooting: double-click on Fault Code (Active) - Status, will displays Overview of Fault Code 2556. Read More: SPN 729 - FMI 4 (Fault Code 2556).

Figure 1.4 - Overview Fault Code 2556

Read More:

Power Supply - Data Erratic, Intermittent or Incorrect (Fault Code: SPN 627 - FMI 2)

Water In Fuel Indicator Sensor Circuit - Voltage Above Normal (Fault Code: SPN 97 - FMI 3)

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