CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – FAULT CODE 698

ECM Internal Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source


Overview

CODE REASON EFFECT
Fault Code: 698
PID: P21
SPN: 1136
FMI: 4
LAMP: Amber
SRT: 

ECM Internal Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage or an open circuit detected at the internal ECM temperature sensor.

None on performance.

ISX and ISM Electronic Control Module
SMALL | MEDIUM | LARGE

Circuit Description

The electronic control module (ECM) has an internal temperature sensor that is used to measure the temperature inside the ECM.

Component Location

The ECM is located on the fuel system 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 keyswitch is in the ON position.

Conditions for Setting the Fault Codes

The ECM detects that the internal temperature sensor circuit is shorted to ground.

Action Taken When the Fault Code is Active

  • The ECM illuminates the amber CHECK ENGINE light immediately after the diagnostic runs and passes.

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 sensor is located internally to the ECM. No troubleshooting is possible for this fault code. If the fault code is active, the ECM must be replaced.

Refer to Troubleshooting Fault Code t05-698

Last Modified:  09-Jul-2010