17B
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30
PETROL INJECTION
Central coolant temperature management
K7J or K7M, and 710
17B
The system is fitted with a single coolant temperature
sensor used for:
- the injection system,
- running the fan assembly,
- the temperature warning light on the instrument panel.
Coolant temperature sensor (1) has 3 tracks:
- two tracks for injection computer coolant temperature
signal,
- one track to indicate the coolant temperature on the
instrument panel.
OPERATION
The coolant temperature sensor (1) enables:
- the coolant temperature to be indicated on the instru-
ment panel,
- the computer to be informed about the engine coolant
temperature.
The injection computer manages the following accor-
ding to the coolant temperature:
- the injection system,
- the fan assembly relay,
- the coolant temperature warning light. The warning li-
ght is controlled by the injection computer if the coo-
lant temperature exceeds 120˚C.
The fan assembly is activated at low speed if the coo-
lant temperature exceeds 100˚C or in the event of coo-
lant temperature sensor failure and is stopped when
the temperature falls below 96˚C.
The fan assembly is activated at high speed if the coo-
lant temperature exceeds 102˚C or if the low speed is
defective and is stopped when the temperature falls be-
low 100˚C.
The fan assembly may be controlled at low speed for
the antipercolation device and at high speed for the air
conditioning system.
If the low speed facility is faulty, the fan will run at high
speed under the low speed conditions.
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