Intake Air Heater 1 Circuit - Voltage Above Normal or Shorted to High Source/Stuck ON (Fault Code: SPN 729 - FMI 3)

SPN729 FMI3 (Cummins QSB3.3)

Figure 1.1 - Inlet Air Heater Driver1 Stuck ON

SPN 729 - FMI 3

Intake Air Heater 1 Circuit - Voltage Above Normal or Shorted to High Source/ Stuck ON.

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 2555 (Inactive)

Figure 1.3 - Displays the Fault Code 2555

3). Troubleshooting: double-click on Fault Code 2555 - Status, will displays Overview of Fault Code 2555. Read More: SPN 729 - FMI 3 (Fault Code 2555).

Figure 1.4 - Overview of Fault Code 2555

Read More:

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

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

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