Fuel System - Fault Tracing - Volvo 240 1989 Service Manual

Fuel system LH2.4 - 240
Fault tracing
The fuel syslem has a built-In fault tracing system. It
is mounted In the control unit and has three dillerent
control functions, one 1 0 read fault codes stored in the
memory and two for continuous testing of the compo­
nents included in the system.
Communication with the diagnostic system is carried
out through the dlagnos licsocket , (which is also used
by the ignition system) . The socket is located behind
the left spring strut tower In the engine compar1ment.
Here Is a fault code example:
The diagnostic socket has a button, a light diode and
a selector cable. When carrying out tault tracing tor
the fuel system, the selector cable is placed in socket
2 of Ihe 6 available , Depressing the button once,
twice or three times chooses the desired fault trating
function.
Faults stored in IIle memory are read via a system of
flashes from the diagnostic socket light diode.
All
lault codes have three numbers, each one capable of
ranging trom 1-9. The codes relating to the luel
system range only between 1 and 4.
The fault code figure is read tram the series at nashes
delivered by the diode. Since the codes all have three
numbers, each code requires three series of
uninterrupted flashes.
There is a three second interval between each series
of flashes to make the code s easy to read .
=
fault code 213
24