User's Manual

7
The Bendix
®
ESP
®
EC‑80
™
Controller also utilizes an
additional Pressure Modulator Valve (PMV) for control
of the trailer service brakes during stability interventions.
Traction Control Valve (TCV)
Bendix ESP EC‑80 Controllers use two TCVs, one on the
steer axle and one on the drive axle. The TCV may be a
separate valve or integrated into the rear axle relay valve.
The Controller will activate the drive axle TCV during
differential braking ATC events.
During stability interventions, the Controller will activate
both the steer axle and drive axle TCVs as required.
Stop Lamp Output
The Controller provides an output to control a relay
that illuminates the vehicle stop lamps during stability
interventions. This information is also available using the
J1939 serial communications link.
ABS Indicator Lamp Control with Optional
Diagnostic Blink Code Switch
The Bendix ESP EC‑80 Controller has internal circuitry to
control the ABS Indicator Lamp on the dash panel.
The ABS Lamp Illuminates:
1. During power up (e.g. when the vehicle is started) for
approximately three (3) seconds and turns off after the
self‑test is completed, providing no Diagnostic Trouble
Codes (DTCs) are present on the ECU;
2. When full ABS operation is not available due to the
presence of a DTC on the ECU;
3. If the ECU is unplugged or has no power;
4. When the ECU is placed into the ABS off‑road
mode (the lamp ashes steadily at a rate of once per
2.5 sec.); or
5. To display blink codes for diagnostic purposes after the
external diagnostic switch is activated.
The Bendix ESP EC‑80 Controller may communicate
with other vehicle control modules to operate the ABS
Indicator Lamp using serial communications. (If you
need to know if this Bendix ESP EC‑80 Controller uses
serial communications to operate the lamp; e‑mail ABS@
bendix.com, (be sure to specify the ECU part number), or
call 1‑800‑AIR‑BRAKE/1‑800‑247‑2725 and speak to the
Bendix Tech Team.)
Indicator Lamp Control Using Serial
Communications Links
As mentioned above, depending on the vehicle
manufacturer, the dash indicator lamps (ABS, ATC,
ESP, and trailer ABS) may be controlled using serial
communications links. In these cases, the Bendix ESP
EC‑80 Controller will send a serial communications
message over the J1939 link, indicating the required status
of the lamp(s). Another vehicle control module receives
the message and controls the indicator lamp(s).
Dynamometer Mode Indicator Lamp Operation
When the Bendix ESP EC‑80 Controller is put into the
Dynamometer mode for testing purposes, the ATC
Indicator Lamp will be illuminated.
Retarder Relay Disable Output
The retarder relay disable output may be used to control a
retarder disable relay. When congured to use this output,
the ECU will energize the retarder disable relay and inhibit
the use of the retarder as needed.
If the ECU is congured for the Hill Start/ Hill Start Assist
feature (HS/HSA), the retarder relay output pin is used to
control the Hill Start status lamp. As a result, the vehicle
loses the retarder relay function when it has the Hill Start
feature.
SAE J1939 Serial Communications
A Controller Area Network (CAN) data link (SAE J1939) is
provided for communication. This link is used for various
functions, such as:
• Diagnostic purposes.
• To disable retarding devices during ABS operation.
• To request that the torque converter disable lock‑up
during ABS operation
• To share information such as wheel speed and ECU
status with other vehicle control modules.
Bendix ESP EC‑80 Controllers utilize the J1939 data link
for:
• ATC and drag torque control functions.
• Vehicle stability functions.
Trailer ABS Indicator Lamp Control
The Bendix ESP EC‑80 Controller will activate a trailer ABS
Indicator Lamp (located on the dash panel) that indicates
the status of the trailer ABS unit on one, or more trailers, or
dollies that are equipped with PLC functionality. Typically,
the Bendix ESP EC‑80 Controller directly controls the
trailer ABS Indicator Lamp based on the information it
receives from the trailer ABS, via PLC.
Alternatively, some vehicles require the Bendix ESP EC‑80
Controller to activate the trailer ABS Indicator Lamp by
communicating with other vehicle Controllers using serial
communications.
(If you need to know if this Bendix ESP EC‑80 Controller
uses a serial communications message to operate the
lamp, e‑mail [e-mail] (be sure to specify the ECU
part number), or call 1‑800‑AIR‑BRAKE (1‑800‑245‑2725)
and speak to the Bendix Tech Team.)
Interaxle Differential Lock Control
(AWD Transfer Case)
Bendix ESP EC‑80 Controllers can control the interaxle
differential lock (AWD transfer case). This is recommended
on AWD vehicles, but the ECU must be specially congured
to provide this feature. E‑mail [e-mail] for more
details.