NHTSA ID Number: 10252485
Manufacturer Communication Number: SD-24-2936
TSB/Document Date: 2024-04-03
Summary
Bendix Stand alone Electronic Air Control system service data. This document contains troubleshooting, diagnostic, and maintenance information for the electronic air control system.
522100
31
74F7FF
SA-EAC dataset
parameters for
cut-in/cut-off are
improper
Compressor is always
on; air dryer safety
valve may open*.
Replace SA-EAC ECU per vehicle
OE guideline**
522103
12
77F7EC
SA-EAC
memory error
SA-EAC does not
communicate on the
CAN network.
Replace the SA-EAC ECU per
vehicle OE guideline**.
Compressor is always
on; air dryer safety
valve may open*.
522104
12
78F7EC
SA-EAC
memory error
SA-EAC does not
communicate on the
CAN network.
Replace the SA-EAC ECU per
vehicle OE guideline**.
Compressor is always
on; air dryer safety
valve may open*.
Table 1 - SA-EAC Troubleshooting
* If the safety valve is open, it is recommended that the safety valve be replaced. Refer to SD-08-12046, Bendix® AD-HF® and AD-HFi® Service
Data Sheet, on B2Bendix.com.
** If possible, confirm with a known good Electronic Control Unit (ECU) prior to replacement.
*** Refer to SD-08-12046, Bendix
® AD-HF® and AD-HFi® Service Data Sheet, on B2Bendix.com for cartridge replacement.
+ CLP is an extra function meant to help support applications that may experience higher than normal cartridge wear. It may be used as an
indicator that more frequent cartridge changes would improve air system performance. The cartridge change interval should not exceed the
time/mileage recommendations of BW8068, Recommended Service Intervals for Bendix® Air Dryers, on B2Bendix.com.
10
SPN
FMI
DTC/
Lookup
Code
521612
1
8CF5E1
Description
Low pressure
warning air
circuit 1 (primary
tank)
Service Shop
Information
(Vehicle Level Effect)
Air pressure in the
primary tank is low
and could lead to
inadequate braking
capabilities.
Service Shop Information
(Recommended Action)
1. Check the air dryer and air
compressor for defect or
leakage and fill up the system.
2. Confirm accurate readings from
the service brake pressure
transducers (primary) per
vehicle OE specification.
3. If the DTC is still active after
15 minutes of pressurization,
refer to the Air Dryer Service
Data Sheet*** for diagnosing
possible pneumatic supply
issues.
521612
18
8CF5F2
Low pressure
warning air
circuit 1 (primary
tank) during idle
Air pressure in the
primary tank is low
during standstill
and could lead to
inadequate braking
capabilities.
1. Check the air dryer and air
compressor for defect or
leakage and fill up the system.
2. Confirm accurate readings from
the service brake pressure
transducers (primary) per
vehicle OE specification.
3. If the DTC is still active after
15 minutes of pressurization,
refer to the Air Dryer Service
Data Sheet*** for diagnosing
possible pneumatic supply
issues.
521613
1
8DF5E1
Low pressure
warning
air circuit 2
(secondary tank)
Air pressure in the
secondary tank is
low and could lead to
inadequate braking
capabilities.
1. Check the air dryer and air
compressor for defect or
leakage and fill up the system.
2. Confirm accurate readings from
the service brake pressure
transducers (primary) per
vehicle OE specification.
3. If the DTC is still active after
15 minutes of pressurization,
refer to the Air Dryer Service
Data Sheet*** for diagnosing
possible pneumatic supply
issues.
Table 1 - SA-EAC Troubleshooting
* If the safety valve is open, it is recommended that the safety valve be replaced. Refer to SD-08-12046, Bendix® AD-HF® and AD-HFi® Service
Data Sheet, on B2Bendix.com.
** If possible, confirm with a known good Electronic Control Unit (ECU) prior to replacement.
*** Refer to SD-08-12046, Bendix® AD-HF® and AD-HFi® Service Data Sheet, on B2Bendix.com for cartridge replacement.
+ CLP is an extra function meant to help support applications that may experience higher than normal cartridge wear. It may be used as an
indicator that more frequent cartridge changes would improve air system performance. The cartridge change interval should not exceed the
time/mileage recommendations of BW8068, Recommended Service Intervals for Bendix® Air Dryers, on B2Bendix.com.
11
SPN
FMI
DTC/
Lookup
Code
521613
18
8DF5F2
Description
Low pressure
warning
air circuit 2
(secondary tank)
during idle
Service Shop
Information
(Vehicle Level Effect)
Air pressure in the
secondary tank is
low during standstill
and could lead to
inadequate braking
capabilities.
Service Shop Information
(Recommended Action)
1. Check the air dryer and air
compressor for defect or
leakage and fill up the system.
2. Confirm accurate readings from
the service brake pressure
transducers (primary) per
vehicle OE specification.
3. If the DTC is still active after
15 minutes of pressurization,
refer to the Air Dryer Service
Data Sheet*** for diagnosing
possible pneumatic supply
issues.
521610
16
8AF5F0
Air dryer
cartridge life
expired
Nominal alert; 100%
cartridge lifetime
consumed; 0%
cartridge lifetime
remaining.
1. Immediate cartridge
replacement is recommended+.
2. If the cartridge is replaced,
reset the cartridge life via
Bendix® ACom® PRO™
Diagnostic Software.
3. If the DTC will not clear after
resetting, replace the SA-EAC.
521610
0
8AF5E0
Air dryer
cartridge life
beyond expired
Over-worn alert; 150% 1. Replace the catridge
cartridge lifetime
immediately and reset the
consumed; -50%
cartridge life via ACom PRO
lifetime overused.
Diagnostic Software.
2. Inspect for possible excessive
moisture and contamination in
the air system+.
3. If the DTC will not clear after
resetting, replace the SA-EAC.
521610
15
8AF5EF
Air dryer
cartridge
remaining life
low
Pre-alert; 85%
cartridge lifetime
consumed; 15%
cartridge lifetime
remaining.
1. Schedule a cartridge
replacement+. Once the
cartridge is replaced, reset the
cartridge life via ACom PRO
Diagnostic Software.
2. If the DTC will not clear after
resetting, replace the SA-EAC.
Table 1 - SA-EAC Troubleshooting
* If the safety valve is open, it is recommended that the safety valve be replaced. Refer to SD-08-12046, Bendix® AD-HF® and AD-HFi® Service
Data Sheet, on B2Bendix.com.
** If possible, confirm with a known good Electronic Control Unit (ECU) prior to replacement.
*** Refer to SD-08-12046, Bendix® AD-HF® and AD-HFi® Service Data Sheet, on B2Bendix.com for cartridge replacement.
+ CLP is an extra function meant to help support applications that may experience higher than normal cartridge wear. It may be used as an
indicator that more frequent cartridge changes would improve air system performance. The cartridge change interval should not exceed the
time/mileage recommendations of BW8068, Recommended Service Intervals for Bendix® Air Dryers, on B2Bendix.com.
12
SPN
FMI
DTC/
Lookup
Code
524033
20
01FFF4
521612
521613
0
2
8CF5E0
8DF5E2
Description
Service Shop
Information
(Vehicle Level Effect)
High air
consumption
condition (check
for leaks)
The loaded duty cycle
of the compressor has
been determined too
high for the average
driving speed of
the vehicle over an
extended period of
time.
1. Inspect the air system for leaks
and the compressor for air
delivery capacity.
SA-EAC
compressor
duty cycle
above normal
operational
range
Over time, the loaded
duty cycle of the
compressor has been
determined to be too
high.
1. Inspect the air system for leaks
and the compressor for air
delivery capacity.
System pressure The system air
too high
pressure exceeded
the cut-out pressure
by a pressure
threshold and for a
time threshold.
Air dryer safety valve
may open*.
522702
2
CEF9E2
Service Shop Information
(Recommended Action)
SA-EAC system
pressure mismatch between
primary and
secondary circuit
Either the primary or
secondary service
brake pressure is
inaccurate.
Compressor is always
on; air dryer safety
valve may open*.
2. Inspect/replace the air dryer
cartridge if necessary***
and reset the cartridge life
via Bendix® ACom® PRO™
Diagnostic Software. Refer
to the Air Dryer Service Data
Sheet*** for diagnosing
possible pneumatic supply
issues.
2. Inspect/replace the air dryer
cartridge if necessary***
and reset the cartridge life
via Bendix® ACom® PRO™
Diagnostic Software. Refer
to the Air Dryer Service Data
Sheet*** for diagnosing
possible pneumatic supply
issues.
1. Inspect the air system for leaks/
obstructions/valve problems.
Confirm the system pressure
sensors are calibrated per
vehicle OE specification.
2. Using manual gauges, check
the pressure in primary and
secondary tanks during a
charge cycle.
1. Check both primary and
secondary tanks to confirm that
there is not a major pressure
difference between them (which
may be indicative of potential
leaking).
2. Confirm accurate readings from
the service brake pressure
transducer (secondary) per
vehicle OE specification.
Table 1 - SA-EAC Troubleshooting
* If the safety valve is open, it is recommended that the safety valve be replaced. Refer to SD-08-12046, Bendix® AD-HF® and AD-HFi® Service
Data Sheet, on B2Bendix.com.
** If possible, confirm with a known good Electronic Control Unit (ECU) prior to replacement.
*** Refer to SD-08-12046, Bendix® AD-HF® and AD-HFi® Service Data Sheet, on B2Bendix.com for cartridge replacement.
+ CLP is an extra function meant to help support applications that may experience higher than normal cartridge wear. It may be used as an
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TSB/Document ID: SD-24-2936
Replacement Service Bulletin Number:
MFR Communication Date: 2024-03-06
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES, AIR
MFR Component System:
MFR Component Subsystem:
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