CM2150 Electronic Control System – FAULT CODE 554

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Overview

ISB with CM2150 – Fuel Rail Pressure Sensor SMALL | MEDIUM | LARGE

ISC and ISL with CM2150 – Fuel Rail Pressure Sensor SMALL | MEDIUM | LARGE

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. Refer to Procedure 100-002 (Engine Diagrams) in Section E for a detailed component location view.

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. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.

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.

Refer to Troubleshooting Fault Code t05-554