TD5 Defender
18
ENGINE MANAGEMENT SYSTEM
10
DESCRIPTION AND OPERATION
The MAP/IAT sensor can fail, or supply an incorrect signal if one or more of the following occur:
•
Sensor open circuit.
•
Short circuit to vehicle supply.
•
Short circuit to vehicle earth.
•
Contaminated sensor element.
•
Damaged sensor element.
•
Resistance in wiring harness.
In the event of a MAP/IAT sensor failure any of the following symptoms may be observed:
•
If the MAP sensor fails manifold pressure is set to a pre-determined default value and the engine performance
will be reduced.
•
If the IAT sensor fails the ECM will set air temperature to a fixed value. The ECM will use a fixed default value
from its memory.
