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Sensor Supply 3 Circuit – Voltage Above Normal or Shorted to High Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 239 PID: S232 SPN: 3511 FMI: 3/3 LAMP: Amber SRT: |
Sensor Supply 3 Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 3 circuit. |
Possible hard starting and rough running. |
 ISB, ISC, and ISL – Sensor Supply 3 Circuit
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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. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
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.
Refer to Troubleshooting Fault Code t05-239
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