SPN 3511 - FMI 3 (Fault Code 239)

SPN 3511 - FMI 3 (Fault Code 239)
SPN3511 FMI3
ISB, ISC, and ISL - Sensor Supply 3 Circuit

Fault Code: 239
PID(P), SID(S): S232
SPN: 3511
FMI: 3/3

REASON : Sensor Supply 3 Circuit - Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 3 circuit.

EFFECT : Possible hard starting and rough running.

Circuit Description: The sensor supply 3 circuit provides 5 volt supply to the primary engine speed/position sensor.

Component Location:
The sensor supply 3 is located in the ECM. 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 running.

Conditions for Setting the Fault Codes:
The ECM detects that the sensor supply 3 signal voltage is more than 5.2-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.
• The backup engine speed sensor will be used by the ECM for the engine speed signal.

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.
  • High voltage on the (+) 5 volt supply wire can be caused by a short to battery voltage in the engine harness or connectors, or a damaged ECM.

Read More:
SPN 108 - FMI 4 (Fault Code 222)
SPN 3511 - FMI 4 (Fault Code 238)


Subscribe to receive free email updates:

0 Response to "SPN 3511 - FMI 3 (Fault Code 239)"

Post a Comment