Bendix Commercial Vehicle Systems EC-30 ABS/ATC CONTROLLER 2/08 - Manual (Page 29)

29
SECTION J - TROUBLESHOOTING THE ATC MODULATOR
Verify 10.0 to 12.0 OHMS across
the ATC modulator leads. Verify
no continuity from ATC modulator
connector pins to ground. Verify
+12 VDC is not measured at any
ATC modulator connector pins.
Check for corroded or damaged ATC
modulator wiring and connectors.
If a circuit fault is found, isolate the
area needing repair by repeating the
measurements at all connections in
the ATC modulator circuit.
Make repairs to wiring or replace ATC
modulator. Reconnect all connectors
to the EC-30
™ controller and ATC
modulator. Reset fault codes by
briefl y holding a magnet in place at
the RESET location of the diagnostic
display. Then rerun the power-up
sequence. Go to Section A.
TRC and MOD LEDs and ATC
active/warning lamp are on.
Turn the ignition off and remove the
18-pin connector from the EC-30
™
controller.
2-pin ATC
Modulator
Connector
EC-30 ™ controller and
ATR Valve Assembly
F E D C B A
18-Pin Connector
1
2
3
18-Pin Connector