SPN 111 - FMI 3 (Fault Code 195 - Three Wire Sensor)

SPN 111 - FMI 3 (Fault Code: 195 - Three Wire Sensor)
ISB, ISC and ISL with CM2150 - Engine Coolant Level Sensor 1 Circuit

Fault Code: 195
PID(P), SID(S): P111
SPN: 111
FMI: 3/3

REASON: Coolant Level Sensor 1 Circuit - Voltage Above Normal or Shorted to High Source. High signal voltage detected at engine coolant level circuit.

EFFECT: None on performance.

Circuit Description:
The electronic control module (ECM) supplies a 5 volt supply to the engine coolant level sensor using a common sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The engine coolant level sensor provides a signal to the ECM on the engine coolant level sensor signal circuit. This sensor signal voltage changes, based on the coolant level in the expansion tank.

Component Location:
The engine coolant level sensor is typically located in the radiator top tank or surge tank.

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 coolant level signal voltage is greater than 4.5-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.
• No engine protection will be available for low coolant level.

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.

Possible causes of this fault code include:
• Open return circuit in the engine harness, connectors, or sensor
• Signal circuit shorted to sensor supply or battery voltage
• Sensor supply circuit shorted to battery voltage.

Read More:
SPN 105 - FMI 0 (Fault Code 155)
SPN 111 - FMI 3 (Fault Code 195 - Two Wire Sensor)


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