BPW ECO Tronic EBS - Page 95

95
8.2 Diagnostic Trouble Codes (DTC)
DTC Displayed Description
Demand Pressure Transducer Group
PRESSURE DEMAND
SENSOR SHORT CIRCUIT
Service line pressure
transducer short circuit
PRESSURE DEMAND
SENSOR OPEN CIRCUIT
Service line pressure
transducer open circuit
PRESSURE DEMAND FAULT Service line pressure
transducer fault
PNEUMATIC DEMAND
ERROR
Service line pressure
transducer fault
Delivery Pressure Transducer Group
EPRV 21 DELIVERY
SENSOR SHORT CIRCUIT
Modulator 21 delivery
pressure transducer short
circuit
EPRV 21 DELIVERY
SENSOR OPEN CIRCUIT
Modulator 21 delivery
pressure transducer open
circuit
EPRV 22 DELIVERY
SENSOR SHORT CIRCUIT
Modulator 22 delivery
pressure transducer short
circuit
EPRV 22 DELIVERY
SENSOR OPEN CIRCUIT
Modulator 22 delivery
pressure transducer open
circuit
One Wheel with Slow Recovery Group
EPRV 21 SLOW WHEEL
RECOVERY
Slow recovery of one wheel
of Modulator 21
EPRV 22 SLOW WHEEL
RECOVERY
Slow recovery of one wheel
of Modulator 22
Possible causes:
Slow brake release,
foundation brake mechanical
faults, dry bearings, broken
spring, restricted piping
Check for kinks and
blockages etc. Incorrect
piping, Wiring.
Modulator fault. Sensor
wiring crossed across an
axle
Reservoir Pressure Transducer Group
RESERVOIR SENSOR
SHORT CIRCUIT
Reservoir pressure
transducer short circuit
RESERVOIR SENSOR OPEN
CIRCUIT
Reservoir pressure
transducer open circuit
EXCESSIVE RESERVOIR
PRESSURE
Reservoir pressure above
9.75 bar
DTC Displayed Description
Air Suspension Pressure Transducer Group
SUSPENSION SENSOR
SHORT CIRCUIT
Suspension pressure
transducer short circuit
SUSPENSION SENSOR
OPEN CIRCUIT
Suspension pressure
transducer open circuit
SUSPENSION PRESSURE
LOW
Suspension pressure values
outside operating range
Pressure Switch Group
REV PRESSURE SWITCH
SHORT CIRCUIT
Relay emergency valve
pressure switch short circuit
REV PRESSURE SWITCH
OPEN CIRCUIT
Relay emergency valve
pressure switch open circuit
REV SWITCH PNEUMATIC
FAULT
Relay emergency valve
pressure switch pneumatic
fault
REV PRESSURE SWITCH
SIGNAL FAULT
Relay emergency valve
pressure switch failed to
activate
ISO11992 (CAN) Electrical Signal Group
PNEUMATIC DEMAND
LOSS
No corresponding
pneumatic demand pressure
TOWED CAN DEMAND
LOSS
CAN line (pin 6 and 7 on
ISO7638) fault
TOWED CAN CONTROL
LOSS
CAN line (pin 6 and 7 on
ISO7638) data fault
Supply Voltage Group
ISO7638 POWER FAILURE Power loss on pin 1 or 2
(ISO7638)
LOW VOLTAGE Supply voltage at ECU less
than 19 V when brake apply
solenoid energised
HIGH VOLTAGE Supply voltage at the ECU
greater than 32 V
UNSPECIFIED POWER
FAULT
Internal ECU fault
ECU Group
ECU EEPROM ERROR Internal ECU fault or ECU
not programmed
CONFIGURATION ERROR Internal ECU fault or ECU
not programmed
ECU UNSPECIFIED ERROR Internal ECU fault or ECU
not programmed
ECU SHUTDOWN Internal ECU fault, the power
supply to the solenoids has
been isolated