SPN 1347 - FMI 3 (Fault Code 272)

SPN 1347 - FMI 3 (Fault Code: 272)
SPN1347 FMI3

ISB, ISC and ISL with CM2150 - Fuel Pump Actuator Circuit

Fault Code: 272
PID(P), SID(S): S126
SPN: 1347
FMI: 3

REASON: Fuel Pump Pressurizing Assembly 1 Circuit - Voltage Above Normal or Shorted to High Source. High signal voltage or open circuit detected at the fuel pump actuator circuit.

EFFECT: Engine will NOT run or engine will run poorly.

Circuit Description:
The circuit is a pulse with modulation (PWM) driver in the electronic control module (ECM) that controls the fuel pump actuator. The actuator is grounded in the ECM. The actuator is normally open. The PWM duty cycle to the fuel pump actuator depends on the difference between desired rail pressure and sensed rail pressure.

Component Location:
The fuel pump actuator is located on engine-mounted fuel pump housing. The engine wiring harness and the ECM are other components in the circuit that can cause this fault code.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes:
The fuel pump actuator circuit PWM signal is detected to be greater than 0-VDC when the PWM signal is turned off by the ECM.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• Fuel rail pressure will be higher than the commanded rail pressure.

Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.

Shop Talk:

  • Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
  • This fault becomes active when the ECM detects an open in the fuel pump actuator circuit. Causes of this fault code are a short circuit to a positive voltage or an open circuit in the fuel pump actuator circuit. If there is high harness resistance or an intermittent open circuit, Fault Code 2311 can have high inactive counts. If the fault code is intermittent, look for causes of an intermittent open circuit such as loose pins and bad connections. If the fault code is intermittent, look closely for loose wire connections at the ECM connector. Also, if the fault code is intermittent, wiggle the harness and the electronic fuel control.

Read More:
SPN 171 - FMI 4 (Fault Code 256)
SPN 1347 - FMI 4 (Fault Code 271)


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1 Response to "SPN 1347 - FMI 3 (Fault Code 272)"

  1. Comment je peut supprimé ce code defaut sur le tableau de bord
    L'engin est situé sur un chantier il et immobilisé