CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – FAULT CODE 2182

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Overview

ISM – Engine Brake Solenoid Number 1 Signal Circuit SMALL | MEDIUM | LARGE

Circuit Description

The electronic control module (ECM) controls the engine brakes on cylinders 1, 2, and 3 by sending a signal on engine brake solenoid number 1 signal circuit. The ECM will only command the brakes on under certain operating conditions.

The engine brake fault code will only become active once the engine brakes are activated and will remain active until the ECM is powered down. Once the ECM is powered down, the fault code will be inactive until the engine brakes are activated again if the circuit interruption is still present. This tree is designed to troubleshoot an inactive fault code.

Component Location

The engine brake solenoids are located under the valve cover. The engine brake solenoids are controlled through the engine harness from the ECM. The engine harness connects to the internal actuator harness that passes through the rocker lever housing on the front of the engine. The engine brake harness is connected to the internal actuator harness through a 3-pin breakout connector located between cylinders 2 and 3.

Conditions for Running the Diagnostics

This diagnostic runs when the keyswitch is in the ON position and the engine is running.

Conditions for Setting the Fault Codes

The engine brake solenoid pulse width modulated (PWM) signal is detected to be greater than 0 VDC when the pulse width modulated (PWM) signal to the engine brakes are turned off by the ECM.

Action Taken When the Fault Code is Active

• The ECM illumines the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• The engine brake solenoid 1 will not be energized.

Conditions for Clearing the Fault Code

The ECM will turn off the amber CHECK ENGINE light and the fault code state will become inactive immediately after the diagnostic runs and passes. The fault code can also be cleaned using the INSITE™ electronic service tool.

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.

Possible causes of this fault include:

• Open circuit in the engine harness, brake harness, or engine brake solenoids
• Signal circuit shorted to voltage source in the engine harness
• Failed ECM.

Refer to Troubleshooting Fault Code t05-2182