ABS Troubleshooting for Trucks,
Trailers, and Buses
C.V. Components Ltd DRA07T I.S.O.
Tester
The C.V.
Components Ltd DRA07T
is an advanced circuit tester, for testing a truck's ISO 7638 socket, trailer susie, and ABS functions.
Overview of the
C.V. Components Ltd DRA07T I.S.O. Tester
The C.V.
Components Ltd DRA07T advanced circuit tester, is
simplicity itself to use. One end is plugged into the ISO 7638 socket on the
truck's headboard, whilst the other end acts as a surrogate ISO 7638 socket,
receiving the trailer ISO Electrical Coil (for two out of the three tests the
unit performs). Set-up time is kept to a minimum, and the results, which can be
easily interpreted, are provided by a series of LED Lights on the side of the
DRA07T unit. Further details on each of the three tests undertaken by the DRA07T,
are provided below.
Testing a truck's
ISO 7638 socket with the Drakefield DRA07T
To test a
truck's ISO 7638 socket, simply plug the DRA07T unit into the ISO 7638 socket on the
truck's headboard, as shown in Fig. 1 above, and switch on the ignition in the
cab.
All five
LED Lights on the side of the DRA07T should light-up GREEN.
Note - if
the ABS warning lamp is on in the cab, LED No. 5 on the side of the DRA07T will
be RED. This will also be the case until the trailer wheels are rotated to give
ohms sensing.
Fig. 5
below shows the LED numbering for the DRA07T.
Testing a
trailer's ISO 7638 susie
with the Drakefield DRA07T
To test a
trailer's ISO 7638 Electrical Coil with the DRA07T, connect the trailer EBS Electrical
Coil to the ISO 7638 socket on the truck's headboard in the normal way, and then
connect the DRA07T unit into the other end of the trailer EBS Electrical Coil
(as shown in Fig. 2 above). All five LEDs on the side
of the DRA07T should light-up GREEN. Note - if the ABS warning lamp is on in
the cab, LED No. 5 on the side of the DRA07T will be RED. Fig. 5 shows the LED
numbering for the DRA07T.
Testing the ABS
functions with the Drakefield DRA07T
First, connect
the DRA07T unit to the ISO 7638 socket on the truck's headboard, and then connect
one end of the trailer electrical ebs coil to the
DRA07T, and the other to the ISO 7638 socket on the trailer headboard (as shown
in Fig. 3 above). Drive the truck above 10kph, until the ABS warning light on
the dashboard goes out. Stop the vehicle, apply the handbrake, and leave the
ignition on. Check the DRA07T unit. All five LED Lights should be lit-up GREEN.
Note this test will also reveal a faulty or missing warning light bulb.
How the C.V.
Components Ltd DRA07T works
When the DRA07T
is connected to the ISO 7638 socket, it tests all the ISO 7638 pins against
each other for live and earth (see Fig. 4 above for ISO 7638 Pin numbering).
If, after turning the ignition on, LED numbers 1, 2 or 5 is GREEN, it means
there is a good live connection above 19.5 volts. If, after turning the
ignition on, LED numbers 3 or 4 is GREEN, it means there is a good earth
connection, however, if LEDS 3 or 4 are RED, it means a bad earth connection.
Fig. 5 below shows the LED numbering for the DRA07T, and the table following,
explains how the results should be interpreted
. 
|
LED 1 = GREEN = O.K. |
LED 1 = RED = Below 19 volts |
|
LED 2 = GREEN = O.K. |
LED 2 = RED = Below 19 volts |
|
LED 3 = GREEN = O.K. |
LED 3 = RED = Bad or no earth |
|
LED 4 = GREEN = O.K. |
LED 4 = RED = Below 19 volts |
|
LED 5 = GREEN = O.K. |
LED 5 = RED = Below 19 volts |
How to order the iso tester DRA07T
You can
order the C.V. Components Ltd Sensor Master DRA08 by giving us a call please on
t. +44 1463 220232 f. +44 1463 710983 e-mail john@cvcomponents.co.uk . We accept
all major credit and debit cards.
SUMMARY:
ISO Tester DRA07T
• - Advanced Circuit Tester
• - Tests a truck's ISO 7638 socket
• - Tests a trailer's ISO 7638 Coil
• - Tests a vehicle's ABS functions
• - Quick to set-up
• - Easy to interpret LED display
• - Powered by ISO 7638 socket
• - Durable construction
• - Designed and manufactured in the