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Coolant Level Sensor Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 422 PID: P111 SPN: 111 FMI: 2 LAMP: Yellow SRT: |
Voltage detected simultaneously on both the coolant level high and low signal pins or no voltage detected on either pin. |
No engine protection for coolant level. |
 Coolant Level Sensor Circuit
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Circuit Description
The coolant level sensor monitors the coolant level within the coolant system and passes information to the electronic control module (ECM) through the engine harness. Do not use a multimeter to check the coolant level sensor. If the radiator coolant level drops below a certain level, a progressive power derate with increasing time after alert will occur.
Component Location
The coolant level sensor is supplied by the vehicle’s OEM and located in the radiator top tank or surge tank.
Shop Talk
- If a shorting plug is used in the coolant level circuit, verify that it is wired correctly. Use the wiring diagram in Section E.
- Inspect the wiring harness between the four-way connector and coolant level sensor for damage.
- Make sure the coolant level sensor is located in the middle of the tank rather than off to one side where the coolant level can change when the vehicle makes a turn.
- Make sure the correct ECM code is in the ECM. Calibrating the ECM with the incorrect DO option can cause Fault Code 422 to be active since some OEMs use a coolant level sensor that requires a special calibration.
Refer to Troubleshooting Fault Code t05-422
Last Modified: 26-Oct-2010
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