23
SECTION D - TROUBLESHOOTING THE ATC ACTIVE/WARNING LAMP
ATC Active/Warning lamp did not
illuminate during the EC-30
™
controller power-up sequence.
With ignition off, remove the 30-pin
connector from the EC-30
™
controller.
YES
NO
Turn ignition on and measure voltage
between pin C2 and ground (pins A1,
A2 or A3). Verify a measurement
equal to battery voltage. (About 12.0
VDC)
Check for corrosion or damage on
the 30-pin connector and wiring. If
none is found, replace the EC-30
™
controller.
With a volt/ohm meter, check wiring,
ATC active/warning lamp and fuse.
When repair is made, reconnect the
30-pin connector to the EC-30
™
controller and rerun the power-up
sequence. Go to Section A.
Note: If there is no wire in pin C2
of the 30-pin connector, the EC-30
™
controller is commanding the ATC
active/warning lamp, using the
J1939 serial communications link.
In this configuration, the actual ATC
lamp is driven by a vehicle dash
controller. Obtain the vehicle manual
and verify the wiring and function of
the ATC active/warning lamp.
To verify proper EC-30
™
controller
communication, go to Section K.
C2 ATC Active/Warning Lamp
A1,A2,A3 Ground
F2 ATC Enable/Disable Switch
1
2
3
K J H G F E D C B A
30-Pin Connector
See Note
this page
ATC active/warning lamp stays on
with no red LEDs on.
With a volt/ohm meter, check the ATC
active/warning lamp circuit and the
ATC enable/disable switch wiring.
Refer to figure 13. When repair is
made, reconnect the 30-pin
connector to the EC-30
™
controller
and rerun the power-up sequence. If
the condition still exists, replace the
EC-30
™
controller.
See Note
this page
Verify that the ATC enable/disable
switch is in the enable position.
If ATC active/warning lamp remains on,
turn ignition off and remove the 30-pin
connector from EC-30
™
controller.
Verify that the EC-30
™
controller is
configured for ATC by observing the
LEDs at power-up, blink code
diagnostics or using a diagnostic tool.
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