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PACCAR PX-9 CM2350 (2013-17) Fault Code197 PID:111 SPN:111 FMI:18 Coolant Level – Data Valid But Below Normal Operational Range – Moderately Severe Level

Description

Reason:
Coolant Level – Data Valid But Below Normal Operational Range – Moderately Severe Level. Low engine coolant level detected.

Effect:
Possible reduced engine performance.

Circuit Description:
The coolant level sensor is a switch and is used to measure the level of the engine coolant in the radiator top tank. The coolant level sensor is immersed in the coolant and returns a different signal voltage when immersed in coolant versus being out of coolant. The engine control module (ECM) monitors the change in the signal voltage to determine the level of the engine coolant.

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

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 Engine Control Module (ECM) detected the coolant level sensor signal voltage was higher than 3-VDC for more than 30 seconds

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
2) The torque output of the engine will be reduced.
3) Exhaust Gas Recirculation (EGR) valve operation will be disabled.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
This fault code goes active when the coolant level inside the radiator top tank or surge tank drops below the sensor level. Fill the top tank with coolant.

If this fault code is active and the coolant level is not low, disconnect the coolant level sensor and check the connectors for traces of coolant. If coolant is found at the electrical connectors, the sensor has malfunctioned and must be replaced.

Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

For intermittent power supply and datalink communication issues with Aftertreatment Components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing or intermittent connections.

Possible Causes:
1) Faulty coolant level sensor
2) Inactive fault codes

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