SPN 157 - FMI 2 (Fault Code 554)
SPN157 FMI2 (Injector Metering Rail 1 Pressure - Data Erratic, Intermittent, or Incorrect)
Fault Code 554
CODES:
Fault Code: 554
PID(P), SID(S): P157
SPN: 157
FMI: 2
Lamp: AMBER
SRT:
REASON: Injector Metering Rail 1 Pressure - Data Erratic, Intermittent, or Incorrect. the ECM has detected that the fuel pressure signal is not changing.
EFFECT: The ECM will estimate fuel pressure and power is reduced.
Circuit Description:
The fuel pressure sensor contains supply, signal, and return pins. The electronic control module (ECM) provides +5 volts to the fuel pressure sensor. This +5 volt power supply is a shared supply. Other sensors on this circuit are the intake manifold pressure sensor and backup engine position sensor.
Component Location:
The fuel pressure sensor is located in the rail fuel on the air intake side of the engine.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running.
Conditions for Setting the Fault Codes:
The ECM detects that the fuel rail pressure reading is not changing with engine operating conditions.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• A default value for the fuel rail pressure reading is used.
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 code can become active any time the engine is loaded and the electronic control module (ECM) detects the fuel pressure in the rail fuel is not changing. This fault code will become inactive whenever the ECM is powered down or if the ECM detects that the engine is loaded and the fuel pressure is changing normally. If there are many inactive counts of this fault code or if the fault is not repeatable, look for signs of tampering to the fuel pressure sensor circuit. If the fault code occurs intermittently (can not be reproduced during a road test), then inspect each of the following for
poor connections or damage:
• Intake manifold pressure sensor
• Backup engine position sensor
• Fuel pressure sensor.
Read More:
SPN 93 - FMI 2 (Fault Code 528)
SPN 157 - FMI 16 (Fault Code 553)
Blog.Teknisi
Fault Code 554
 |
| ISC and ISL with CM2150 - Fuel Rail Pressure Sensor |
CODES:
Fault Code: 554
PID(P), SID(S): P157
SPN: 157
FMI: 2
Lamp: AMBER
SRT:
 |
| ISB with CM2150 - Fuel Rail Pressure Sensor |
REASON: Injector Metering Rail 1 Pressure - Data Erratic, Intermittent, or Incorrect. the ECM has detected that the fuel pressure signal is not changing.
EFFECT: The ECM will estimate fuel pressure and power is reduced.
Circuit Description:
The fuel pressure sensor contains supply, signal, and return pins. The electronic control module (ECM) provides +5 volts to the fuel pressure sensor. This +5 volt power supply is a shared supply. Other sensors on this circuit are the intake manifold pressure sensor and backup engine position sensor.
Component Location:
The fuel pressure sensor is located in the rail fuel on the air intake side of the engine.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running.
Conditions for Setting the Fault Codes:
The ECM detects that the fuel rail pressure reading is not changing with engine operating conditions.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• A default value for the fuel rail pressure reading is used.
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 code can become active any time the engine is loaded and the electronic control module (ECM) detects the fuel pressure in the rail fuel is not changing. This fault code will become inactive whenever the ECM is powered down or if the ECM detects that the engine is loaded and the fuel pressure is changing normally. If there are many inactive counts of this fault code or if the fault is not repeatable, look for signs of tampering to the fuel pressure sensor circuit. If the fault code occurs intermittently (can not be reproduced during a road test), then inspect each of the following for
poor connections or damage:
• Intake manifold pressure sensor
• Backup engine position sensor
• Fuel pressure sensor.
Read More:
SPN 93 - FMI 2 (Fault Code 528)
SPN 157 - FMI 16 (Fault Code 553)
Blog.Teknisi
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