PACCAR PX-9 CM2350 (2013-17) Fault Code:352 PID:SID 212 SPN:3509 FMI:4 Sensor Supply 1 Circuit – Voltage Below Normal or Shorted to Low Source
Reason:
Sensor Supply 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at sensor supply number 1 circuit.
Effect:
Possible reduced engine performance.
Circuit Description:
The sensor supply 1 circuit of the engine control module (ECM) provides a 5 volt supply to various sensors on the engine harness. Refer to the wiring diagram for sensor supply identification.
Component Location:
Sensor Supply 1 originates in the Engine Wiring Harness portion of the ECM. It supplies 5 volts to sensors in the engine wiring harness.
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 Engine Control Module (ECM) detected the sensor supply 1 signal voltage was out of range low.
Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
2) A default value is used for all of the sensors on the sensor supply 1 circuit.
Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
5) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.
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.
During the fault code response test outlined for each sensor connected to sensor supply number 1, Fault Code 352 must be active before unplugging each sensor. If the fault code is not active, but can be easily duplicated by operating the engine, the following can be performed:
1) Operate the engine under the conditions that will cause Fault Code 352 to become active, even if it logs for a short period of time. Unplug one sensor at a time until Fault Code 352 stops logging under the test conditions. Each sensor can be unplugged with the engine running.
Note: The engine may not start if the camshaft position sensor is unplugged
Possible Causes:
1) Inactive fault codes
2) Faulty sensors and circuits
3) Faulty circuit response
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