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FAULT CODE 197

Coolant Level - Data Valid But Below Normal Operating Range - Moderately Severe Level

Overview


CODE

REASON

EFFECT

Fault Code: 197

Coolant Level - Data Valid But Below Normal Operating Range - Moderately Severe Level. Low

None on

PID:

engine coolant level detected.

performance.

SPN: 111



FMI: 1/18



LAMP: Amber



SRT:



Coolant Level Sensor 1 Circuit - Industrial Engine


Coolant Level Sensor 1 Circuit - Marine Engines


Coolant Level Sensor 1 Circuit - Power Generation En


Circuit Description

The engine 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 coolant level sensor 1 monitors the engine coolant level within the coolant system and passes information to the ECM through the original equipment manufacturer (OEM) harness and engine harness.


Component Location


The coolant level sensor 1 is typically located in the radiator top tank or surge tank. Refer to the OEM service manual for location.


Shop Talk


Some engines are equipped with a 2-wire sensor instead of a 3-wire sensor. The 2-wire sensors do not have the 5-volt supply wire in the circuit. Possible causes of this fault code include:

  • Open return or signal circuit in the harness, connectors, or sensor

  • Signal wire shorted to sensor supply or battery voltage

  • An open supply circuit in the harness (on 3-wire sensors only).


Refer to Troubleshooting Fault Code t05-197.


Last Modified: 28-Nov-2012

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