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ECM Internal Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 697 PID: P21 SPN: 1136 FMI: 3 LAMP: Amber SRT: |
ECM Internal Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage or an open circuit detected at the internal ECM temperature sensor. |
None on performance. |
 ISX and ISM Electronic Control Module
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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 a voltage source.
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 t05-697
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