Kia Niro: Intake And Exhaust System / Exhaust Heat Recovery System(EHRS) Description and operation

Kia Niro 2017 (DE HEV) Service Manual / Engine Mechanical System / Intake And Exhaust System / Exhaust Heat Recovery System(EHRS) Description and operation

Description and Operation

During cold start or in winter, the fuel efficiency can be improved by heating up the coolant with the exhaust gas heat discharged after combusting the engine. When the engine has been sufficiently warmed up, the valve on the passage of exhaust gas is opened to block the heat exchange of exhaust gas and coolant, thus to prevent overheating of coolant. The valve of the exhaust gas passage is opened and closed by the operation of wax actuator according to the temperature of coolant. To monitor the temperature of coolant, a separate water temperature sensor (WTS) is installed, and in the event of overheated coolant [over 120°C (248°F], the engine overheating warning lamp in the cluster is illuminated.

[Coolant Flow Chart]

Exhaust Manifold Repair procedures
Removal and Installation 1. Remove the engine room under cover. (Refer to Engine and Transaxle Assembly - "Engine Room Under Cover") 2. ...

Exhaust Heat Recovery System(EHRS) Troubleshooting
Troubleshooting Symptom Inspection Remedy Overheating • Engine overheating • Temperature gauge rising to HI ...

Other information:

Kia Niro 2017 (DE HEV) Service Manual: Inhibitor Switch Repair procedures
Inspection    Inspect the following items by referring to inspection flow chart. (Refer to Inhibitor Switch - "Troubleshooting") 1. Check the diagnostic trouble codes (DTC) usin ...

Kia Niro 2017 (DE HEV) Service Manual: Engine Coolant Temperature Sensor (ECTS) Schematic diagrams
Circuit Diagram ECTS [Water Temperature Control Assembly] Harness Connector ECTS [EGR Cooler Tube] Harness Connector ...

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