SPN 3509 - FMI 3 (Fault Code 386)

SPN 3509 - FMI 3 (Fault Code 386)
SPN3509 FMI3
ISB, ISC, and ISL with CM2150 - Sensor Supply 1 Circuit

Fault Code: 386
PID(P), SID(S): S212
SPN: 3509
FMI: 3

REASON: Sensor Supply 1 Circuit - Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 1 circuit.

EFFECT: Engine power derate.

Circuit Description:
The sensor supply 1 of the electronic control module (ECM) provides a 5 VDC supply for the engine camshaft position sensor, fuel rail pressure sensor, exhaust gas pressure sensor, intake manifold pressure sensor, crankcase pressure sensor, exhaust gas recirculation (EGR) differential pressure sensor, barometric pressure sensor, engine oil pressure sensor and EGR position 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 greater than 5.25-VDC for more than 1 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 is used for all the sensors tied to the 5 VDC supply.

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.

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 failed sensor, or a failed ECM power supply.

Read More:
SPN 3509 - FMI 4 (Fault Code 352)
SPN 627 - FMI 12 (Fault Code 351)


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