PACCAR PX-9 CM2350 (2013-17) Fault Code:235 PID:111 SPN:111 FMI:1 Coolant Level – Data Valid But Below Normal Operating Range – Most Severe Level
Reason:
Coolant Level – Data Valid But Below Normal Operating Range – Most Severe Level. The engine coolant is severely low
Effect:
Progressive power and/or speed derate increasing in severity from time of alert. If the Engine Protection Shutdown feature is enabled, the engine will shut down 30 seconds after the red STOP lamps starts flashing.
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 engine is running.
Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the coolant level sensor signal voltage was greater than 3-VDC for more than 30 seconds, indicating severely low coolant level.
Action Taken When the Fault Code is Active:
1) The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.
2) Exhaust Gas Recirculation (EGR) valve operation will be disabled.
3) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
4) The engine will be shut down if the Engine Protection Shutdown feature is enabled.
Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and let it idle for up to 5 minutes.
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 red STOP 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:
Possible Causes:
1) Low coolant level
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