Sensor Supply 3 Circuit – Voltage Below Normal, or Shorted to Low Source
|Fault Code: 238
Sensor Supply 3 Circuit – Voltage Below Normal, or Shorted to Low Source. Low voltage detected on the +5 volt sensor supply circuit to the engine speed sensor.
Possible hard starting and rough running.
Engine Speed Sensor Circuit
The engine speed voltage supply provides +5 VDC for the engine speed sensor. If the supply wire to this sensor is damaged, the sensor will not work properly.
The engine speed sensor is located on the intake side of the engine between number 5 and number 6 cylinders at the crankshaft level. Refer to Procedure 100-002 for detailed component view location.
Low voltage on the +5 VDC supply line can be caused by a short circuit to ground in a supply line, a short circuit between a supply line or a return line, a failed sensor, or a failed ECM power supply.