Renault Megane Quiz
Engine and peripherals

Centralised engine coolant temperature management

In this manual: Engine and peripherals
Engine and peripherals — 141Chassis — 79Chassis — 72Renault Mégane III Driver's Manual — 87Electrical equipment — 221Engine and peripherals — 47Electrical equipment — 80Transmission — 14Air conditioning — 30Bodywork — 115Trim and upholstery — 44General vehicle information — 27Air conditioning — 59General vehicle information — 16Transmission — 38Sealing and soundproofing — 7General vehicle information — 3
~3min read

K9K

The coolant temperature sensor (for injection and dashboard temperature display) is a 3-circuit sensor:

  • 2 circuits for coolant temperature information to the ECU (terminals B H2 and B H3),
  • 1 circuit for the dashboard display.

This system controls the cooling fan by the injection ECU. It consists of a single temperature sensor used for injection, the cooling fan, the temperature gauge and the engine coolant temperature warning light on the dashboard.

The cooling fan control request is sent from the injection ECU over the network.

I - COOLING FAN UNIT OPERATION, ENGINE RUNNING

The cooling fan unit is controlled:

  • at low speed if the engine coolant temperature exceeds 99 C or if the coolant temperature sensor fails, and it stops when the temperature drops below 96 C,
  • at high speed if the engine coolant temperature exceeds 102 C or if low speed is faulty, and it stops when the temperature drops below 99 C.

Low speed, then high speed, of the cooling fan unit is controlled when the air conditioning function is selected on the dashboard.

If low speed is faulty, high speed operates under the operating conditions of low speed.

II - ENGINE COOLANT TEMPERATURE WARNING LIGHT OPERATION

The warning light is controlled by the injection ECU over the multiplexed network.

The warning light comes on steadily if the coolant temperature exceeds 118 C. It goes off when the temperature drops below 115 C.

F9Q

The coolant temperature sensor (for injection and dashboard temperature display) is a 3-circuit sensor:

  • 2 circuits for coolant temperature information to the ECU (terminals B E1 and B K3),
  • 1 circuit for the dashboard display.

This system controls the cooling fan by the injection ECU. It consists of a single temperature sensor used for injection, the cooling fan, the temperature gauge and the engine coolant temperature warning light on the dashboard.

The cooling fan control request is sent from the injection ECU over the network.

I - COOLING FAN UNIT OPERATION, ENGINE RUNNING

The cooling fan unit is controlled:

  • at low speed if the engine coolant temperature exceeds 99 C and it stops when the temperature drops below 96 C,
  • at high speed if the engine coolant temperature exceeds 102 C and it stops when the temperature drops below 99 C,
  • low speed, then high speed, of the cooling fan unit is controlled when the air conditioning function is selected.

II - ENGINE COOLANT TEMPERATURE WARNING LIGHT

The warning light is controlled by the injection ECU over the multiplexed network.

The warning light comes on steadily if the coolant temperature exceeds 120 C. It goes off when the coolant temperature drops below 115 C.

Test yourself

A quick Renault Megane quiz: every answer comes with an explanation and a link to the manual page.