Discovery II
ENGINE MANAGEMENT SYSTEM - V8
18-2-20 DESCRIPTION AND OPERATION
There are three types of ECT sensor diagnostic checks:
l
The ECT sensor signal is within limits, but is inaccurate – the engine has to be running and the signal indicates
a coolant temperature below 40
°
C (104
°
F). The signal differs too much from the coolant temperature model for
longer than 2.53 seconds.
l
The ECT sensor signal is greater than the maximum threshold value – the ECM has to be powered up to perform
the diagnostic, but the engine does not need to be running.
l
The ECT sensor signal is less than the minimum threshold value – the ECM has to be powered up to perform
the diagnostic, but the engine does not need to be running.
Should a malfunction of the component occur the following fault codes may be evident and can be retrieved by
TestBook:
P code
J2012 description
Land Rover description
P0116
Engine coolant temperature circuit/range
performance problem
Signal differs too much from temperature model for
longer than 2.53s
P0117
Engine coolant temperature circuit low input
Open circuit or short circuit to battery supply
P0118
Engine coolant temperature circuit high input
Short circuit to earth
