SPN SID FMI
Blink
Code
Description
Warning
Light
System
Reaction
Cause Action
803 15 4 8 + 1
ECU Voltage
is Too Low
ABS WL
(while
supply
voltage is
detected
as too low)
ABS Wheel
Disabled
ESC/RSC/ATC/
HSA Disabled
The supply voltage
is temporarily too
low.
• Measure the battery or ignition voltage under load. Verify voltage does not drop below
9v (12v system) or 18v (24v system).
• Verify correct ECU and battery ground (less than 1 ohm).
• Load Test between ECU powers and grounds.
• Check the vehicle battery and associated components (alternator).
• Check for corroded or damaged wiring between the ECU and voltage supply as well as
ground path.
• Check conditions of fuses.
803 15 5 8 + 5
All ABVs High
Impedance
ABS WL
ESC/RSC/ATC/
HSA Disabled
ECU has detected
that the suspect
Active Braking Valve
circuit is not
detected, has high
impedance or the
circuit has been
interrupted.
• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0
ohm for 24V system).
• Verify if connectors are fully seated, check for corroded or damaged wiring between the
ECU and ABVs.
• Replace ECU if all wiring checks are within spec and if fault repeats and does not clear.
• Fault may indicate an issue with the BPS in certain vintage ECUs, See SID 55 FMI 5.
803 15 6 8 + 5
All ABVs
Shorted to
Ground
ABS WL N/A
Continuity between
suspect Active
Braking Valve circuit
and ground is
detected.
• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0
ohm for 24V system).
• Check for continuity between suspect Active Braking Valve circuit and ground.
• Check for corroded or damaged wiring between the ECU and ABVs.
• Check ECU grounds should be less than 1 ohm of resistance to ground.
• Replace ECU if all wiring checks are within spec and if fault repeats and does not clear.
803 15 7 8 + 3
Internal
Voltage
Supply
ABS WL
ABS Wheel
Disabled
ESC/RSC/ATC/
HSA Disabled
A failure was
detected on the
internal ECU relay 2.
• Measure the battery or ignition voltage supply. Verify voltage is between 9v-16v (12v
system) or 18v-32v (24v system).
• Verify correct ECU and battery ground (less than 1 ohm).
• Load test between ECU powers and ground.
• Check for corroded or damaged wiring between the ECU and voltage supply as well as
ground path.
• If all wiring checks are within specs and if fault repeats and does not clear, this may
indicate the ECU has failed.
1045 16 3 7 + 7
E401 and
E404 Version
Only. Pressure
Sensor
Shorted to
UBATT
ABS WL
ESC/RSC/ATC/
HSA Disabled
Continuity between
pressure signal
circuit and voltage
supply (short circuit)
is detected. E401
and E404 version
only.
• Check for continuity between pressure sensor signal circuit and voltage supply.
• Check connectors and pressure sensor for corrosion.
• It could also be possible that the ECU has detected a permanent braking signal from
the pressure sensor between zero to 30 mph.
• Fault only for E401 and E404 versions only.
1045 16 5 7 + 7
E401 and
E404 Version
Only. Pressure
Sensor
Shorted to
Ground
ABS WL
ESC/RSC/ATC/
HSA Disabled
Continuity between
pressure signal
circuit and ground
(short circuit) or an
open circuit is
detected. E401 and
E404 version only.
• Verify if connectors are fully seated, check for corroded or damaged wiring between the
ECU and component.
• Check for continuity between pressure sensor signal circuit and ground.
• The pressure sensor supply line could be also clogged or frozen up.
• Fault only for E401 and E404 versions only.
806 18 3 7 + 2
ABV Drive
Axle. Shorted
to UBATT
ABS WL
ABS Wheel
Disabled
ESC/RSC/ATC/
HSA Disabled
Continuity between
suspect Active
Braking Valve circuit
and voltage supply
(short circuit) is
detected.
• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0
ohm for 24V system).
• Check for continuity between suspect ABV ground circuit and voltage supply.
• Check for corroded or damaged wiring between the ECU and ABV.
4010661a
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