Heavy Equipment Repair

How to Solve Caterpillar C9 Engine Coolant Level Voltage High 12 111-3 Fault

Conditions Which Generate This Code:

This condition occurs when there is an open in the circuit for the “2-wire float sensor”. The “Coolant Level Sensor” parameter must be programmed to”2-wire Float Sensor” before this diagnostic code can occur. If the “Coolant Level Sensor” parameter is programmed to “2-pin switch “, or “4-pin” this diagnostic code is disabled.

The coolant level sensor is installed by the vehicle’s Original Equipment Manufacturer (OEM). This sensor is an optional sensor for “Engine Monitoring”. Engine monitoring is a programmable feature of the Caterpillar Engine.

 

Related Contents:

Caterpillar ET 2024A 2023A 2018A Diagnostic Software Free Download

CAT Communication Adapter 3 478-0235

Caterpillar Factory 18 Digits Password Service

 

Control Module (ECM).The sensor is selectable through a customer programmable parameter and the customer programmable parameter may be protected by customer passwords. Some OEM installed coolant level sensors are not connected to the ECM. Do not confuse an OEM installed coolant level sensor that is independent of engine monitoring with the coolant level sensor that is used for engine monitoring.

 

The customer programmable parameter for the coolant level sensor can be programmed to “4-Pin”, “2-wire float sensor”, or “2-pin switch”. Also, the customer programmable parameter for the coolant level sensor can be programmed to “NO” if the option for the coolant level sensor is not being used.

 

If the parameter “Coolant Level Sensor” is programmed to “NO”, the coolant level sensor is ignored by the ECM. Conversely, if the parameter is set, then a sensor must be installed. The coolant level is monitored by the engine monitoring system when the parameter “Coolant Level Sensor” is programmed to “4-Pin” or “2-wire float sensor”.

 

Probable Causes:

1) Coolant level sensor

2) Coolant level sensor harness/connector

3) ECM Connection

4) Wiring between ECM and coolant level sensor

5) ECM Failure

More repair case for Caterpillar machine,please refer to:Caterpillar Machine Repair

auto

Recent Posts

How to Remove Center Joint and Center Frame for HITACHI Hitachi EX5600-7B

This instruction show you guide on how to remove center joint and center frame for…

2 days ago

How to Repair Doosan Machine P0100 DTC Signal Error

How to solve Doosan heavy duty machine P0100 fault code signal error of air mass…

1 week ago

How to Solve Fendt 800 Vario S4 wayline Running Slow

If the vehicle is oscillating on the wayline or catches up the wayline very slowly…

2 weeks ago

How to Adjust Cruise Control Release Linkage for Kubota L3901 Excavator?

This is instruction show you guide on how to adjust cruise control release linkage for…

2 weeks ago

How to do Perform Cylinder Cut-off Test for Massey Ferguson Tractor

This instruction show you guide on how to use AGCO EDT diagnostic software to perform…

2 weeks ago

Hitachi EX5600-7B Folding Stairway and Surrounding Parts Removal Guide

This instruction show you guide on how to remove folding stairway and surrounding part for…

2 weeks ago