SPN 661 - FMI 4 (Fault Code 238)
Thursday, August 02, 2018
Fault Codes CUMMINS ISB ISBe QSB4.5 QSB5.9 QSB6.7 ISC QSC8.3 ISL ISLe QSL9 CM850 (CM2850)
SPN661 FMI4
Sensor Supply 3 Circuit - Voltage Below Normal, or Shorted to Low Source
CODES:
Fault Code: 238
PID(P), SID(S): S232
SPN: 611
FMI: 4/4
Lamp: Amber
REASON: 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.
EFFECT: Possible hard starting and rough running.
Circuit Description:
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.
Component Location:
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.
Shop Talk:
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.
Read More:
SPN 111 - FMI 1 (Fault Code 235)
SPN 644 - FMI 2 (Fault Code 237)
Blog.Teknisi
Sensor Supply 3 Circuit - Voltage Below Normal, or Shorted to Low Source
 |
| Engine Speed Sensor Circuit |
CODES:
Fault Code: 238
PID(P), SID(S): S232
SPN: 611
FMI: 4/4
Lamp: Amber
REASON: 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.
EFFECT: Possible hard starting and rough running.
Circuit Description:
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.
Component Location:
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.
Shop Talk:
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.
Read More:
SPN 111 - FMI 1 (Fault Code 235)
SPN 644 - FMI 2 (Fault Code 237)
Blog.Teknisi
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