7 SPN, SID, FMI Fault Codes
92
WABCO Maintenance Manual MM-0112 (Revised 07-18)
Figure 7.26
Figure 7.26
SPN SID FMI
Blink
Code
Description
Warning
Light
System
Reaction
Cause Action
Datalink J1939
639 231 2 7 + 1
SAE J1939
Data Link
VSC1 Speed
Erratic,
Intermittent or
Incorrect
ABS WL N/A
Received vehicle
speed and ABS
vehicle speed is
incorrect.
Supervision
normally not
activated.
• Check tire size and verify ECU is for the correct vehicle application.
639 231 5 7 + 1
SAE J1939
Data Link
Open or Short
Circuit
ABS WL
ESC/RSC/ATC/
HSA Disabled
SAE J1939
communication is
not possible.
• If ABS ECU is only vehicle ECU not communicating, verify J1939 wiring between ABS
ECU and J1939 backbone.
• Resistance should be 60 ohms between J1939 high and low.
• Key on, check voltage to ground at the ECU harness connector J1939 pins and verify
the high side has 2.5 to 5 volts and the low side has 2.49 volts or less. The readings
will fluctuate but should be in range and should never be the same. The total of both
readings together should be approximately 5 volts.
639 231 6 7 + 1
SAE J1939
No Access
ABS WL
ESC/RSC/ATC/
HSA Disabled
SAE J1939
communication is
not possible.
• If ABS ECU is only vehicle ECU not communicating, verify J1939 wiring between ABS
ECU and J1939 backbone.
• Resistance should be 60 ohms between J1939 high and low.
• Key on, check voltage to ground at the ECU harness connector J1939 pins and verify
the high side has 2.5 to 5 volts and the low side has 2.49 volts or less. The readings
will fluctuate but should be in range and should never be the same. The total of both
readings together should be approximately 5 volts.
639 231 9 7 + 1
SAE J1939
Data Link
EEC1
Timeout
ABS WL
ESC/RSC/ATC/
HSA Disabled
There is either too
much time in
between EEC1
broadcasts from the
engine or the
message content is
not as expected.
• Contact OEM to verify J1939 wiring between engine ECU and vehicle J1939 backbone
is correct and messages are correct.
• If ABS ECU is only vehicle ECU not communicating, verify J1939 wiring between ABS
ECU and J1939 backbone.
• Resistance should be 60 ohms between J1939 high and low.
• Key on, check voltage to ground at the ECU harness connector J1939 pins and verify
the high side has 2.5 to 5 volts and the low side has 2.49 volts or less. The readings
will fluctuate but should be in range and should never be the same. The total of both
readings together should be approximately 5 volts.
639 231 10 7 + 1
SAE J1939
XBR Timeout
Temporary
ABS WL
XBR Disabled
The external brake
request message
(XBR) is expected
but is not being
received in expected
time or not at all.
• Verify J1939 wiring between external ECU which is sending request and J1939
backbone.
• This message is most likely to come from Adaptive Cruise or a Collision Mitigation
System such as OnGuard™.
639 231 12 7 + 1
SAE J1939
Internal Error
ABS WL
ABS Wheel
Disabled
ESC/RSC/ATC/
HSA Disabled
An internal fault
related to the CAN
controller is
detected.
• Verify J1939 wiring between ABS ECU and J1939 backbone.
• Resistance should be 60 ohms between J1939 high and low.
• Key on, check voltage to ground at the ECU harness connector J1939 pins and verify
the high side has 2.5 to 5 volts and the low side has 2.49 volts or less. The readings
will fluctuate but should be in range and should never be the same. The total of both
readings together should be approximately 5 volts.
639 231 13 7 + 1
SAE J1939
XBR Timeout
Temporary
ABS WL
XBR Disabled
The external brake
request message
(XBR) has been
received incorrectly.
• Verify J1939 wiring between external ECU which is sending request and J1939
backbone.
• This message is most likely to come from Adaptive Cruise or a Collision Mitigation
System such as OnGuard™.
4012655a
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