SPN 1347 - FMI 3 (Fault Code 272)
Friday, August 03, 2018
Fault Codes CUMMINS ISB ISBe QSB4.5 QSB5.9 QSB6.7 ISC QSC8.3 ISL ISLe QSL9 CM850 (CM2850)
SPN1347 FMI3 - ISB/QSB (Automotive and Industrial Application)
High Fuel Pressure Solenoid Valve Circuit - Voltage Above Normal or Shorted to High Source
CODES:
Fault Code: 272
PID(P), SID(S): S126
SPN: 1347
FMI: 3
Lamp: Amber
REASON: High Fuel Pressure Solenoid Valve Circuit - Voltage Above Normal or Shorted to High Source. Electronic fuel control actuator shorted high.
EFFECT: Engine will run poorly but will be severely derated. Rail pressure will be higher than
commanded.
Circuit Description:
The circuit is a pulse width modulated (PWM) driver in the Electronic Control Module (ECM) that controls the electronic fuel control actuator. The actuator is grounded in the ECM. The actuator is a normally open. Pulse width modulation (PWM) duty cycle to the electronic fuel control actuator depends on the difference between desired rail pressure and sensed rail pressure. Duty cycle will also decrease (electronic fuel control actuator opens) as fueling increases.
Component Location:
The electronic fuel control 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.
Shop Talk:
This fault becomes active when the ECM detects an open in the electronic fuel control actuator circuit. Causes of this fault code are a short circuit to a positive voltage or an open circuit in the electronic fuel control actuator circuit. If there is high harness resistance, Fault Code 2311 could 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.
Fault Code 272 - ISC/QSC/ISL/QSL (Automotive, Industrial, and Marine Application)
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. 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.
Shop Talk:
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 could 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 1195 - FMI 2 (Fault Code 269)
SPN 1347 - FMI 4 (Fault Code 271)
Blog.Teknisi
High Fuel Pressure Solenoid Valve Circuit - Voltage Above Normal or Shorted to High Source
 |
| Electronic Fuel Control Actuator Circuit |
CODES:
Fault Code: 272
PID(P), SID(S): S126
SPN: 1347
FMI: 3
Lamp: Amber
REASON: High Fuel Pressure Solenoid Valve Circuit - Voltage Above Normal or Shorted to High Source. Electronic fuel control actuator shorted high.
EFFECT: Engine will run poorly but will be severely derated. Rail pressure will be higher than
commanded.
Circuit Description:
The circuit is a pulse width modulated (PWM) driver in the Electronic Control Module (ECM) that controls the electronic fuel control actuator. The actuator is grounded in the ECM. The actuator is a normally open. Pulse width modulation (PWM) duty cycle to the electronic fuel control actuator depends on the difference between desired rail pressure and sensed rail pressure. Duty cycle will also decrease (electronic fuel control actuator opens) as fueling increases.
Component Location:
The electronic fuel control 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.
Shop Talk:
This fault becomes active when the ECM detects an open in the electronic fuel control actuator circuit. Causes of this fault code are a short circuit to a positive voltage or an open circuit in the electronic fuel control actuator circuit. If there is high harness resistance, Fault Code 2311 could 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.
Fault Code 272 - ISC/QSC/ISL/QSL (Automotive, Industrial, and Marine Application)
 |
| High Fuel Pressure Solenoid Valve Circuit |
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. 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.
Shop Talk:
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 could 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 1195 - FMI 2 (Fault Code 269)
SPN 1347 - FMI 4 (Fault Code 271)
Blog.Teknisi
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