Cummins ISB4.5 CM2150 Fault Code: 352 PID: SID 212 SPN: 3509 FMI: 4 Sensor Supply 1 Circuit – Voltage Below Normal or Shorted to Low Source.

Posted by PerDiezel Solutions on January 21, 2026

Circuit Description
The sensor supply 1 of the electronic control module (ECM) provides a 5 volt supply for multiple engine sensors.

Component Location
Sensor supply number 1 is located in the ECM engine harness connector and provides a 5 volt supply to various sensors. The supply voltage is spliced off in the engine harness to each sensor it supports.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is operating.

Conditions for Setting the Fault Codes
The ECM detects that the sensor supply 1 signal voltage is less than 4.75-VDC for more than one second.

Action Taken When the Fault Code is Active
-The ECM illuminates the amber CHECK ENGINE lamp and/or the MIL immediately after the diagnostic runs and fails.
-Engine torque could possibly be reduced.
-A default value is used for all of the sensors on the sensor supply 1 circuit.

Conditions for Clearing the Fault Code
-This fault code can not be cleared with INSITE™ electronic service tool.
-To validate the repair, start the engine and let it idle for 1 minute.
-The ECM will turn off the amber CHECK ENGINE lamp and/or MIL immediately after the diagnostic runs and passes.
-Use INSITE™ electronic service tool to verify the fault code is inactive.
-The inactive fault code will be cleared from the memory after 9600 hours of engine operation without a reoccurrence.

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

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Cummins ISB4.5 CM2150 Fault Code: 334 PID: 116 SPN: 110 FMI: 2 Engine Coolant Temperature – Data Erratic Intermittent or Incorrect.

WARNING!