Bendix Commercial Vehicle Systems EC-30 ABS/ATC CONTROLLER 2/08 - Manual (Page 26)

26
SECTION G - TROUBLESHOOTING POWER TO THE EC-30 ™ CONTROLLER
D u e t o c o r r o s i o n , d a m a g e o r
poor termination, the wiring and/
or connectors may be limiting the
electrical current fl ow to the EC-30
™
controller. This means that when the
EC-30
™ controller needs more current,
the voltage level may be dropping.
In order to measure the voltage
under load, place a load, such as a
type 1157 stop lamp bulb, between
ignition power (pins B1, K2, K3) and
ground (pins A1, A2, A3) at the 30-pin
connector. While the lamp is in place,
measure the voltage across the pins. It
is important to check each power and
ground pin combination. The operating
range of the EC-30 is 9.0-16.0 VDC.
Verify a measurement equal to battery
voltage. (About 12.0 VDC) The loaded
voltage should drop no more than 1.0
VDC from the measured unloaded
voltage.
ABS Warning lamp is on and green
VLT LED is off or fl ashing.
Turn the ignition off and disconnect
the 30-pin connector from the EC-30
™
controller.
Turn the ignition on and measure voltage
between ignition power (pins B1, K2,
K3) and ground (pins A1, A2, A3) at the
30-pin connector. It is important to check
each power and ground pin combination.
The operating range of the EC-30
™
controller is 9.0 -16.0 VDC. Verify a
measurement equal to battery voltage.
(About 12.0 VDC)
With a volt/ohm meter, check the
power wiring, ground wiring and
fuse. Look for corroded or damaged
wires or connectors. When repair
is made, reconnect the 30-pin
connector to the EC-30
™ controller
and rerun the power up sequence.
Go to Section A.
With a volt/ohm meter, check the
power and ground wiring. Look
for corroded or damaged wires
or connectors. If repair is made,
reconnect the 30-pin connector to
the EC-30
™ controller and rerun the
power up sequence.
Go to Section A.
Measure the loaded
voltage across a type
1157 stop lamp bulb.
1
2
3
K J H G F E D C B A
30-Pin Connector
YES
NO
A1,A2,A3 Ground
B1,K2,K3 Power
If proper loaded and unloaded voltage
is measured at the 30-pin connector
and no corrosion or damage is found
on the EC-30
™ controller connector,
replace the EC-30 ™ controller.