CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – FAULT CODE 352

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Overview

ISX – Sensor Supply 1 Circuit SMALL | MEDIUM | LARGE

ISM – Sensor Supply 1 Circuit SMALL | MEDIUM | LARGE

Circuit Description

The sensor supply 1 of the electronic control module (ECM) provides a 5 VDC supply for the barometric pressure sensor, engine oil pressure sensor, exhaust gas recirculation (EGR) differential pressure sensor, and the aftertreatment fuel pressure sensor.

Component Location

Sensor supply number 1 is located in the ECM engine harness connector and provides a 5 VDC supply to various pressure sensors.

Conditions for Running the Diagnostics

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

Conditions for Setting the Fault Codes

The ECM detects that the sensor supply 1 signal voltage is less than 4.8 VDC for more than one second.

Action Taken When the Fault Code is Active

• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• A default value for the barometric pressure sensor, engine oil pressure sensor, EGR differential pressure sensor, and the aftertreatment fuel pressure sensor is used.

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.

Low voltage on the +5 volt supply line can be caused by a short circuit to ground in a supply line, a short circuit between a supply line and a return line, a failed sensor, or a failed ECM power supply.

Refer to Troubleshooting Fault Code t05-352