CM870 and ISX Engines – FAULT CODE 2215

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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 IFSM. Use the following procedure for a detailed component location view. Refer to Procedure 100-002 in Section E.

Conditions for Running the Diagnostics

This diagnostic runs continuously when the engine is operating.

Conditions for Setting the Fault Codes

The ECM detects that the fuel delivery pressure is lower than the minimum 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.
• The engine may not start, or the performance output of the engine could be limited, due to the low 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, calibrate the ECM. Use the following procedure in the appropriate Troubleshooting and Repair Manual for the engine being serviced. Refer to Procedure 019-032 in Section 19.

It is possible to swap the connections between the aftertreatment fuel pressure sensor and the fuel delivery pressure sensor. If this occurs, Fault Code 2215 will intermittently go active and the engine will run rough and will surge at low idle. If these symptoms are present, make sure the fuel pressure connections are connected properly.

The fuel pressure is monitored by the electronic control module (ECM). If the rail fuel pressure is lower than an acceptable level for given engine operating conditions, the fault code is logged.

NOTE: One possible cause for this fault code is a damaged or sticking drain-back valve located in the fuel supply circuit in the integrated fuel system module (IFSM) which is located directly above the fuel lift pump.

Refer to Troubleshooting Fault Code t05-2215.