Bendix Commercial Vehicle Systems EC-60 ATC STD/PREM CONTROLLERS - Manual (Page 5)

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Alternatively, some vehicles require the EC-60 ™ controller
to activate the trailer ABS Indicator Lamp by communicating
with other vehicle controllers using serial communications.
(If you need to know if your EC-60 ™ controller uses a serial
communications message to operate the lamp, e-mail
[email protected], specifying the ECU part number, or call
1-800-AIR-BRAKE and speak to the Bendix TechTeam.)
SAE J1708/J1587 Serial Communications
An SAE J1708 data link, implemented according to SAE
J1587 recommended practice, is available for diagnostic
purposes, as well as ECU status messages.
ATC Lamp Output/ATC Off-Road Switch Input
Premium ECUs control the ATC dash lamp.
The ATC Lamp Illuminates:
1. During power up (e.g. when the vehicle is started) and
turns off after the self test is completed, providing no
diagnostic trouble codes are present.
2. When ATC is disabled for any reason.
3. During an ATC event (the lamp will flash rapidly).
4. When the ECU is placed in the ATC off-road mode (the
lamp will flash slowly at a rate of 1.0 seconds on, 1.5
seconds off). This notifies the vehicle operator that the
off-road mode is active.
Interaxle Differential Lock Control (AWD Transfer
Case) Premium ECUs can control the interaxle differential
lock (AWD transfer case). This is recommended on AWD
vehicles, but the ECU must be specially configured to
provide this feature. E-mail [email protected] for more
details.
POWER-UP SEQUENCE
WARNING: The vehicle operator should verify proper
operation of all installed indicator lamps (ABS, ATC, and
trailer ABS) when applying ignition power and during
vehicle operation. See Figures 6 and 7.
Lamps that do not illuminate as expected when ignition
power is applied, or remain illuminated, indicate the need
for maintenance.
ABS Indicator Lamp Operation
The ECU will illuminate the ABS Indicator Lamp for
approximately three seconds when ignition power is
applied, after which the lamp will extinguish if no diagnostic
trouble codes are detected.
The ECU will illuminate the ABS Indicator Lamp whenever
full ABS operation is not available due to a diagnostic
trouble code. In most cases, partial ABS is still available.
ATC Status/Indicator Lamp Operation
The ECU will illuminate the ATC lamp for approximately
2.5 seconds when ignition power is applied, after which
the lamp will extinguish, if no diagnostic trouble codes are
detected.
The ECU will illuminate the ATC Indicator Lamp whenever
ATC is disabled due to a diagnostic trouble code.
Trailer ABS Indicator Lamp Operation
Certain models of the ECU will control the Trailer ABS
Indicator Lamp when a PLC signal (SAE J2497) from a
trailer ABS ECU is detected.
ECU Configuration Test
Within two seconds of the application of ignition power, the
ECU will perform a test to detect system configuration with
regards to the number of wheel speed sensors and PMVs.
This can be audibly detected by a rapid cycling of the PMVs.
(Note: The ECU will not perform the configuration test when
wheel speed sensors show that the vehicle is in motion.)
Pressure Modulator Valve Chuff Test
After the performance of the configuration test, the EC-60 ™
controller will perform a Bendix-patented PMV Chuff Test.
Engine torque limiting
and differential braking
enabled
No ATC
ATC System
Status Indicator
FIGURE 7 - ATC INDICATOR LAMP START UP SEQUENCE
ON
OFF
Power
Application
ON
OFF
FIGURE 6 - ABS DASH LAMP START UP SEQUENCE
*Some vehicle manufacturers may illuminate the trailer ABS
indicator lamp at power-up regardless of whether a PLC
signal is detected from the trailer or not. Consult the vehicle
manufacturer’s documentation for more details.
Trailer ABS
Indicator Lamp
(PLC Detected)*
Trailer ABS Indicator
Lamp
(PLC Not Detected)
Powered Vehicle ABS
Indicator Lamp
ABS System
Status Indicators
Power
Application
ON
OFF
ON
OFF
ON
OFF
0.5 2.0 2.5 3.0 (sec.) 1.5
0.5 2.0 2.5 3.0 (sec.) 1.5