WABCO iABS 2S/1M Standard, Maintenance Manual

Page: 67 / 188

67
Diagnostics
Blink
Code
SPN FMI
Suspect
Component
and Location
ITP
Function
Fault
Description
(FMI)
Cause Repair Information
7 7 6 External
Modulator
Valve
N/A ABS Relay
Valve/
Solenoid
Control -
EV Current
Too High
or Circuit
Grounded
Cable to ABS relay
valve probably has
a short circuit to
supply voltage.
- Verify an external modulator
is installed by checking to see
if a cable is plugged in to the
external modulator port of the
ABS ECU.
- Verify if no cable is attached,
that the external modulator cap
is sealed and there are no
signs of moisture or corrosion
on the pins of the ABS ECU.
- If no external modulator valve
is used and all previous
checks pass, reconfigure
the system to a 2S/2M or
4S/2M system depending
on how many sensors are
used through the WABCO
TOOLBOX PLUS™ Software.
- If equipped with an external
modulator, verify resistance
from the exhaust and inlet
valve to ground is between 4
to 8 ohms through the whole
circuit.
- Verify there is no continuity
on any of the pins of the
external modulator valve cable
to chassis ground.
7 7 11 External
Modulator
Valve
N/A ABS Relay
Valve/FSC
Actuator
Control
Timeout
External modulator
error.
- Switch off ignition for at
least 5s. If failure is no
longer present, there may
be a problem with the supply
voltage.
- Execute supply voltage
check.
7 7 14 External
Modulator
Valve
N/A Special
Instructions
An error has
occurred on the
external modulator
or on the ECU.
- Switch off the ignition for at
least 5 seconds. If the error
persists, contact WABCO
Customer Care Center at
855-228-3203 for assistance.
9 9 1 Internal
Modulator
Valve
N/A H1H2 Trailer
Modulator/
Solenoid
Valve
Control -
Load Too
Low
Internal modulator
error.
- Switch off ignition for at
least 5s. If failure is no longer
present, there may be a
contact problem with the
supply voltage.
- Verify proper power, ground
at the main ABS ECU power
connector and load test the
power and ground circuit.