Citroen C5 Aircross Quiz
Cooling

Effect of automatic gearbox

In this manual: Cooling
AAS - Parking Aid — 8Owner's Manual Citroën C5 II — 139Citroen C5 Aircross (2017- 2024) - Owner's Manual — 143Audio system — 14Overspeed control — 7Multifunction display — 4Driver information instrument cluster — 20Navigation assistance — 8Intruder alarm — 7Mechanical specifications — 9Power supply — 8Electrical equipment — 13Lighting and electrical equipment — 3Immobiliser — 4Sunroof — 10Exterior lighting / signalling — 38Multiplexing — 7Air conditioning — 7Body — 6General specifications — 9Automatic gearbox control — 3Exterior mirrors — 10Airbags — 5Defrost — 6Underinflation — 6Interior lighting — 4Wipers / Washers — 6Window lifters — 11Cooling — 8Opening management — 7Cruise control — 5Suspension — 4Grip management — 1Paint — 2Exterior lighting control — 1Indicators (turn signals) — 1Automatic lighting systems - General recommendations — 1Wiper control — 1Special position of the front wipers — 1
~1min read

Performance

The information supplied by the transmission oil temperature sensor, located in the automatic gearbox hydraulic block, allows the AT gearbox control module to force the Cooling Fan Unit to start, via the Engine Control Module, to cool the gearbox oil through the heat exchanger.

Block diagram

Incidence de la boite de vitesses automatique
Effect of automatic gearbox

Key:

  • single arrow: wired link,
  • triple arrow: multiplexed link.
Description fonctionnelle

Functional description

Description fonctionnelle

Degraded mode

A fault in the AT gearbox oil temperature sensor causes the following operation:

  • The AT gearbox control module uses the engine coolant temperature value as its setpoint,
  • If the engine coolant temperature sensor is faulty, the AT gearbox control module uses a default stored gearbox oil temperature value as its setpoint.

The AT gearbox control module transmits the AT gearbox fault information on the CAN network. The BSI takes this information and transmits it to the instrument cluster via the VAN CONFORT network.

A loss of communication between the CAN network and the AT gearbox control module causes the Cooling Fan Unit to run at low speed.

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