CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – FAULT CODE 2216

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Overview

ISX – Fuel System Circuit SMALL | MEDIUM | LARGE

Circuit Description

The fuel delivery pressure sensor responds to pressure changes in the fuel manifold of the integrated fuel system module (IFSM). The fuel delivery pressure sensor has a 5 volt supply circuit, a sensor signal voltage, and a return circuit.

The electronic control module (ECM) provides a 5 volt supply to the fuel delivery pressure sensor using a common sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The fuel delivery pressure sensor provides a signal to the ECM on the fuel delivery pressure sensor signal circuit. This sensor signal voltage changes based on the pressure in the fuel manifold. The ECM will detect a low signal voltage at operating conditions such as during an idle or a deceleration. The ECM will detect a high signal voltage during high engine load operating conditions.

The gear pump draws fuel from the fuel tank through a suction fuel filter and an anti-drainback valve. The gear pump develops between 1724 and 2620 kPa [250 and 380 psi] of fuel pressure. The fuel flows through a pressure fuel filter and fuel shutoff valve to the fueling and timing actuators and rail fuel pressure sensor.

Component Location

The rail fuel pressure sensor is located on the bottom front corner of the integrated fuel system module. 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 delivery pressure is higher than the recommended pressure level.

Action Taken When the Fault Code is Active

• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• Performance output of the engine could be limited due to the high fuel pressure condition.

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.

The fuel pressure is monitored by the ECM. If the rail fuel pressure is higher than an acceptable range for engine operating conditions, the fault code is logged.

Refer to Troubleshooting Fault Code t05-2216