Discovery 2. Manual — part 781

INSTRUMENTS

DESCRIPTION AND OPERATION

88-33

Engine oil pressure warning lamp

The engine oil pressure warning lamp within the instrument pack utilises a red LED and a clear legend. The LED
illuminates when the engine oil pressure is below the specified pressure (see table), providing the driver with a visible
warning that the engine oil pressure has fallen below the specified minimum reading.

There is no self-test performed at ignition on for this warning lamp.

The power input for the LED is supplied by the instrument pack via fuse 27. The oil pressure switch located on the
engine provides the earth path to illuminate the warning lamp, it will remain illuminated until the engine is started and
the oil pressure exceeds the appropriate threshold and opens the switch contacts.

Low oil pressure switch operating pressures

The response to the voltage signal at the instrument pack is as follows:

l

< 1.8 volts = warning lamp on.

l

> 7.7 volts = warning lamp off.

Engine type

Switch opening pressure, bar (lbf.in

2

)

V8

0.22 to 0.59 (3.0 to 8.5)

Diesel

0.25 to 0.42 (3.5 to 6.0)

INSTRUMENTS

88-34

DESCRIPTION AND OPERATION

Alternator charge warning lamp

The alternator charge warning lamp within the instrument pack utilises a red LED and a clear legend. The LED
illuminates when the alternator output voltage is less than 2 volts. When the alternator output is greater than 7.6 volts
the LED is extinguished, providing the driver with a visible warning that the alternator is charging.

When the ignition is switched on, and the LED illuminates, it will remain illuminated until the engine is started and
voltage is above the predetermined parameter, or the ignition is switched off providing there is no fault.

The power input for the LED is supplied by the instrument pack via fuse 27. The alternator provides a signal to
illuminate the warning lamp by means of a hard wired connection to the instrument pack.

The response to the voltage signal at the instrument pack is as follows:

l

< 2.0 volts = warning lamp on.

l

> 7.6 volts = warning lamp off.

INSTRUMENTS

DESCRIPTION AND OPERATION

88-35

Hill Descent Control (HDC) fault warning lamp

The HDC fault warning lamp within the instrument pack utilises an amber LED and a clear legend. On vehicles fitted
with hill descent control the SLABS ECU illuminates the LED if a fault within the HDC system is detected, providing
the driver with a visible warning.

When the ignition is switched on, the SLABS ECU illuminates the LED to provide a self-check, it will remain illuminated
for 3 seconds or until the ignition is switched off, providing there is no fault.

The power input for the LED is supplied by the instrument pack via fuse 27. The SLABS ECU provides the earth path
to illuminate the HDC fault warning lamp

The voltage on the earth path from the SLABS ECU to the instrument pack has the following functions:

l

< 1.8 volts = warning lamp is switched on.

l

> 7.7 volts = warning lamp is switched off.

INSTRUMENTS

88-36

DESCRIPTION AND OPERATION

Self Levelling Suspension (SLS) warning lamp

The SLS warning lamp within the instrument pack utilises an amber LED and a clear legend. The SLABS ECU
illuminates the LED continuously if a fault within the SLS is detected, providing the driver with a visible warning.

When the ignition is switched on the SLABS ECU illuminates the LED to provide a self-check, providing there is no
fault it will remain illuminated for 3 seconds or until the ignition is switched off.

On vehicles equipped with coil springs the SLS warning lamp is extinguished after 850 milliseconds if the SLABS ECU
configuration of the vehicle is correct.

The SLS warning lamp flashes at 2 Hz when the remote handset control is used to raise or lower the ride height.

If a new SLABS ECU is installed the SLS warning lamp will remain illuminated until the ECU has been calibrated by
TestBook.

The warning lamp will illuminate continuously when battery voltage is less than 10 volts for greater than 1 second.

When the vehicle is in transportation mode the SLS warning lamp is illuminated continuously with ignition on, and will
flash at 2 Hz frequency as the vehicle rises from bump stop level to transport level on engine start.

The power input for the LED is supplied by the instrument pack via fuse 27. The SLABS ECU provides the earth path
to illuminate the warning lamp.

The voltage on the earth path from the SLABS ECU to the instrument pack has the following functions:

l

< 1.8 volts = warning lamp on.

l

> 7.7 volts = warning lamp off.