Ford 2002 Bantam Workshop Manual page 1128

412-00-35
DIAGNOSIS AND TESTING (CONTINUED)
• Connect the battery positive terminal with the
relay, pin 8.
• Connect the battery negative terminal with the
relay, pin 9.
Measure the resistance at the relay between pin 3
and pin 2.
Does the relay switch (audible click) when battery
voltage is applied and is the resistance less than
1,0 ohm?
If yes, the relay is OK.
If not, INSTALL a new relay.
Refrigerant Circuit
Workshop Equipment
Servicing unit/pressure gauges
Stopwatch
Electronic leak tester
Leak test
Test all components and refrigerant lines with an
electronic leak tester. Follow the equipment
manufacturer's instructions.
If necessary switch on the motor and the air
conditioning to locate any small leaks in the high-
pressure lines.
NOTE: Heavy oil contamination on lines or
components is an indication of leaks.
Leaks
In the event of any leaks, rectify the leak(s),
renew any faulty components and drain and refill
the air conditioning system.
System Test
Three values are used for the fault diagnosis:
• Low-pressure
• High-pressure
• Compressor switching cycles (on/off)
E9425 EN
Climate Control System — General Information
Connecting the testing equipment
The following requirements must be met in order
to carry out an accurate test:
• Close both of the manual valves on the
pressure gauges. Connect the pressure
gauges to the high-pressure and the low-
pressure side of the air conditioning system.
• Start the engine, set the air conditioning to
maximum cooling and air re-circulation, and
set the blower to maximum power.
• Run the engine at 1500 rev/min.
Specified values for high and low-pressure
The measured values for high and low-pressure
depend on the outside temperature. This is
shown in the diagram and the table.
The area between the two curves corresponds to
the tolerance range. The measured value must
lie in this range.
Specified values for high-pressure
Item Description
1 High-pressure (bar)
2 Outside temperature (°C)
Specified values for low-temperature
412-00-35
07/2001 2002 Bantam