SPN 1347 - FMI 4 (Fault Code: 271)
Thursday, August 02, 2018
Fault Codes CUMMINS ISB ISBe QSB4.5 QSB5.9 QSB6.7 ISC QSC8.3 ISL ISLe QSL9 CM850 (CM2850)
SPN1347 FMI4 (ISB/QSB (Automotive and Industrial Application)
High Fuel Pressure Solenoid Valve Circuit - Voltage Below Normal or Shorted to Low Source
CODES:
Fault Code: 271
PID(P), SID(S): S126
SPN: 1347
FMI: 4
Lamp: Amber
REASON: High Fuel Pressure Solenoid Valve Circuit - Voltage Below Normal or Shorted to Low Source. Electronic fuel control actuator shorted low.
EFFECT: Engine will run poorly at idle. Engine will have low power. Fuel 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 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.
Component Location:
The electronic fuel control actuator is located on the 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 a short circuit in the electronic fuel control actuator circuit. Causes for this fault code are short circuit to ground or low resistance (electronic fuel control actuator coil is shorted internally) in the circuit for the electronic fuel control actuator. When excessive current or a short circuit is detected, the ECM driver to the electronic fuel control actuator is turned off to protect the circuit. It is necessary to cycle the keyswitch off and then back on before the ECM will retest for the cause of the fault code. The ECM driver is activated at key-on; and if the
cause is no longer present, the fault code will become inactive and can be cleared. If the fault code is intermittent, look for causes of an intermittent short to ground in the wiring harness or connectors.
Read More:
SPN 94 - FMI 2 (Fault Code 268)
SPN 1195 - FMI 2 (Fault Code 269)
Fault Code 271 (ISC/QSC/ISL/QSL Automotive, Industrial, and Marine Application)
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 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.
Component Location:
The fuel pump actuator is located on the engine-mounted fuel pump. The engine siring 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 a short circuit in the electronic fuel control actuator circuit. Causes for this fault code are short circuit to ground or low resistance (fuel control actuator coil is shorted internally) in the circuit for the fuel pump actuator. When excessive current or a short circuit is detected, the ECM driver to the fuel control actuator is turned off to protect the circuit. It is necessary to cycle the keyswitch off and then back on before the ECM will retest for the cause of the fault code. The ECM driver is reenabled at key-on; and if the cause is no longer present, the fault code will become inactive and can be cleared. If the fault code is intermittent, look for causes of an intermittent short to ground in the wiring harness or connectors. Since the ISC and ISL engines utilize a 2-stage fuel rail pressure relief valve, failures to the fuel pump actuator will result in operation with the fuel rail pressure relief valve open. Extended operation with the fuel rail pressure relief valve open can damage the pressure relief valve.
Fault Code 2311 may have high counts if the fault condition is or was intermittent.
Blog.Teknisi
High Fuel Pressure Solenoid Valve Circuit - Voltage Below Normal or Shorted to Low Source
 |
| Electronic Fuel Control Actuator Circuit |
CODES:
Fault Code: 271
PID(P), SID(S): S126
SPN: 1347
FMI: 4
Lamp: Amber
REASON: High Fuel Pressure Solenoid Valve Circuit - Voltage Below Normal or Shorted to Low Source. Electronic fuel control actuator shorted low.
EFFECT: Engine will run poorly at idle. Engine will have low power. Fuel 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 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.
Component Location:
The electronic fuel control actuator is located on the 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 a short circuit in the electronic fuel control actuator circuit. Causes for this fault code are short circuit to ground or low resistance (electronic fuel control actuator coil is shorted internally) in the circuit for the electronic fuel control actuator. When excessive current or a short circuit is detected, the ECM driver to the electronic fuel control actuator is turned off to protect the circuit. It is necessary to cycle the keyswitch off and then back on before the ECM will retest for the cause of the fault code. The ECM driver is activated at key-on; and if the
cause is no longer present, the fault code will become inactive and can be cleared. If the fault code is intermittent, look for causes of an intermittent short to ground in the wiring harness or connectors.
Read More:
SPN 94 - FMI 2 (Fault Code 268)
SPN 1195 - FMI 2 (Fault Code 269)
Fault Code 271 (ISC/QSC/ISL/QSL Automotive, Industrial, and Marine Application)
 |
| Electronic Fuel Control Actuator Circuit |
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 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.
Component Location:
The fuel pump actuator is located on the engine-mounted fuel pump. The engine siring 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 a short circuit in the electronic fuel control actuator circuit. Causes for this fault code are short circuit to ground or low resistance (fuel control actuator coil is shorted internally) in the circuit for the fuel pump actuator. When excessive current or a short circuit is detected, the ECM driver to the fuel control actuator is turned off to protect the circuit. It is necessary to cycle the keyswitch off and then back on before the ECM will retest for the cause of the fault code. The ECM driver is reenabled at key-on; and if the cause is no longer present, the fault code will become inactive and can be cleared. If the fault code is intermittent, look for causes of an intermittent short to ground in the wiring harness or connectors. Since the ISC and ISL engines utilize a 2-stage fuel rail pressure relief valve, failures to the fuel pump actuator will result in operation with the fuel rail pressure relief valve open. Extended operation with the fuel rail pressure relief valve open can damage the pressure relief valve.
Fault Code 2311 may have high counts if the fault condition is or was intermittent.
Blog.Teknisi
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