NHTSA ID Number: 10252486
Manufacturer Communication Number: SD-31-7570
TSB/Document Date: 2024-04-03
Summary
Bendix
iSense Pro Air Disc Brake Continuous Wear Sensing Electronic Control for trailer applications. Service Data. This document is useful for troubleshooting, diagnostics, and maintenance of the electronic wear sensing on trailer.
link as required.
ACTIVE DIAGNOSTIC TROUBLE
CODE (DTC) MODE
For troubleshooting, the active and inactive DTC retrieval
modes are typically used. All active DTCs may also be
retrieved using a hand‑held or PC‑based diagnostic tool,
such as ACom PRO Diagnostic Software.
INACTIVE DIAGNOSTIC TROUBLE
CODE (DTC) MODE
The ADB wear-sensing ECU stores past Diagnostic Trouble
Codes (DTCs) in its memory. The record is commonly
referred to as “event history.” When an active DTC is
cleared, the ECU stores it in the event history memory as
an inactive DTC. Inactive DTCs and event history may be
retrieved and cleared by using a PC-based diagnostic tool,
such as ACom PRO Diagnostic Software.
2. Reconnect the electrical connector to the ECU. The
connector should be installed only by hand until it
clicks into place.
3. Start the vehicle and monitor a PC-based diagnostic
tool to verify unintended faults are not active.
Refer to the section titled Troubleshooting: Electronic
Control Unit (ECU) Wiring Harness Connectors for more
information on wiring harnesses.
5
USING PC-BASED DIAGNOSTICS
TECHNICAL ASSISTANCE
Bendix® ACom® PRO™ Diagnostic Software is an RP-1210compliant PC-based diagnostic software program. With
ACom PRO diagnostic software, maintenance personnel
can:
For additional assistance, the Bendix Tech Team can be
reached by email at [email protected] or by phone
at 1-800-AIR-BRAKE (1-800-247-2725), option 2. Bendix
Tech Team representatives are available Monday through
Thursday, 8:00 a.m. – 6:00 p.m., and Friday, 8:00 a.m. –
5:00 p.m. ET.
•
Obtain Diagnostic Trouble Code (DTC) information
(both active and inactive DTCs)
•
Retrieve event history
•
Clear inactive DTCs and event history
•
Verify Electronic Control Unit (ECU) configuration
•
Perform system and component tests
•
Read/write customer information in the scratch pad
•
Save and print information
•
Receive troubleshooting assistance
WIRING HARNESS CONNECTOR PIN
ASSIGNMENTS
PC-based diagnostic tools attach to the vehicle diagnostic
connector. See Figure 2.
The ADB wear-sensing ECU utilizes one (1) Deutsch
connector for wire harness connections. See Figure 3 and
refer to Table 2.
All unused pin positions must be populated by the
appropriate wire plug.
When using ACom PRO diagnostic software to diagnose the
Air Disc Brake (ADB) wear-sensing ECU, the computer’s
serial, parallel, or USB port needs to be connected to
the vehicle’s diagnostic connector. For more information
and to download ACom PRO diagnostic software, visit
B2Bendix.com.
Figure 2 – Vehicle Diagnostic Connector
Figure 3 – Pin Assignments
PIN
DESIGNATION
DESIGNATION
PIN
DESIGNATION
1
Ignition Power
7
Sensor Signal - Trailer Axle #1 Left
13
Sensor Signal - Trailer Axle #4 Left
2
Ground
8
Sensor Signal - Trailer Axle #1 Right
14
Sensor Signal - Trailer Axle #4 Right
3
J1939 CAN High
9
Sensor Signal - Trailer Axle #2 Left
15
Sensor Power Out (+5V),
Trailer Axle #2
4
J1939 CAN Low
10
Sensor Signal - Trailer Axle #2 Right
16
Sensor Power Out (+5V),
Trailer Axles #3 and #4
5
Sensor Power Out (+5V),
Trailer Axle #1
11
Sensor Signal - Trailer Axle #3 Left
17
Sensor Ground,
Trailer Axle #2
6
Sensor Ground, Trailer Axle #1
12
Sensor Signal - Trailer Axle #3 Right
18
Sensor Ground,
Trailer Axles #3 and #4
Table 2 – Pin Assignments
6
PIN
TROUBLESHOOTING DIAGNOSTIC:
POWER SUPPLY
TROUBLESHOOTING DIAGNOSTIC: J1939
CAN COMMUNICATIONS
Possible symptoms that may indicate an issue with the
power supply include:
Possible symptoms that may indicate an issue with the
J1939 CAN communication include:
• Lack of Electronic Control Unit (ECU) function
• Lack of J1939 CAN communication
• Erratic ECU function
• Sporadic J1939 CAN communication
Perform the following to diagnose potential power supply
issues:
Perform the following to diagnose potential J1939 CAN
communication issues:
•
Take all measurements at the ECU harness connector.
•
Take all measurements at the ECU harness connector.
•
Place a load (i.e. an 1157 stop lamp) across ignition
and ground connection and measure the ignition
and battery voltage with the load. Ignition‑to‑ground
should measure between 9.0 to 18.0 VDC.
•
Check for corroded or damaged wiring connector
problems such as opens or shorts to voltage or
ground.
•
Check for damaged wiring and damaged or corroded
connectors and connections.
•
Check for damaged or reversed J1939 wiring.
•
•
Check the condition of the vehicle battery and
associated components.
Check for other J1939 devices which may be loading
down (inhibiting) J1939 communication.
•
Check the alternator output for excessive noise.
See Figure 5 and refer to Table 4.
See Figure 4 and refer to Table 3.
View from Back of Connector
PIN
View from Back of Connector
PIN
DESIGNATION
1
Ignition Power
2
Ground
Figure 4 – Power Supply Tests
ISSUE
Voltage
below 9 V
Voltage
above
18 V
Check the vehicle battery and associated
components.
•
Check for damaged wiring.
•
Check for damaged or corroded connectors
and connections.
•
Contact the vehicle manufacturer for further
assistance.
•
Ensure the battery voltage is correct for the ECU.
•
Check vehicle battery and associated
components.
•
Check for damaged wiring.
•
Check for damaged or corroded connectors
and connections.
•
Contact the vehicle manufacturer for further
assistance.
Table 3 – Power Supply Troubleshooting
3
J1939 High
4
J1939 Low
Figure 5 – J1939 CAN Communication Tests
ISSUE
POTENTIAL SOLUTION
•
DESIGNATION
ECU not identified
in Bendix® ACom®
PRO™ Diagnostic
Software
POTENTIAL SOLUTION
•
Check for damaged or corroded
connectors and connections.
•
Check the EC part number and confirm
it is configured to the correct baud rate.
Refer to B2Bendix.com.
•
Check for damaged or reversed J1939
wires or power/ground wires.
•
Using Bendix® ACom® PRO™ Diagnostic
Software, check to see if the wearsensing ECU is broadcasting CAN
messages from a source address other
than 206 (CE).
•
Confirm ECU failure by installing an
ECU that has been verified to function
properly.
Table 4 – J1939 CAN Communication Troubleshooting
7
DIAGNOSTIC TROUBLE CODES (DTC) TABLE
Refer to Table 5, Figure 6, and the corresponding service action code in Table 6.
SPN
(J1939)
FMI
(J1939)
22754
3
Trailer Axle #1, Left Wheel, Wear Sensor Shorted to Voltage
A
22754
4
Trailer Axle #1, Left Wheel, Wear Sensor Shorted to Ground or Open Circuit
B
22755
3
Trailer Axle #1, Right Wheel, Wear Sensor Shorted to Voltage
A
22755
4
Trailer Axle #1, Right Wheel, Wear Sensor Shorted to Ground or Open Circuit
B
22756
3
Trailer Axle #2, Left Wheel, Wear Sensor Shorted to Voltage
A
22756
4
Trailer Axle #2, Left Wheel, Wear Sensor Shorted to Ground or Open Circuit
B
22757
3
Trailer Axle #2, Right Wheel, Wear Sensor Shorted to Voltage
A
22757
4
Trailer Axle #2, Right Wheel, Wear Sensor Shorted to Ground or Open Circuit
B
22758
3
Trailer Axle #3, Left Wheel, Wear Sensor Shorted to Voltage
A
22758
4
Trailer Axle #3, Left Wheel, Wear Sensor Shorted to Ground or Open Circuit
B
22759
3
Trailer Axle #3, Right Wheel, Wear Sensor Shorted to Voltage
A
22759
4
Trailer Axle #3, Right Wheel, Wear Sensor Shorted to Ground or Open Circuit
B
22760
3
Trailer Axle #4, Left Wheel, Wear Sensor Shorted to Voltage
A
22760
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TSB/Document ID: SD-31-7570
Replacement Service Bulletin Number:
MFR Communication Date: 2024-03-12
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES, HYDRAULIC
MFR Component System:
MFR Component Subsystem:
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