WABCO iABS 2S/1M Standard, Maintenance Manual

Page: 73 / 188

73
Diagnostics
Blink
Code
SPN FMI
Suspect
Component
and Location
ITP
Function
Fault
Description
(FMI)
Cause Repair Information
14 251 4 Power
Supply
N/A Power
Supply -
Deep Under-
voltage
A deep
undervoltage has
occurred.
- The power supply to the
trailer modulator is insuf fi cient
and/or lies below the normal
voltage range.
- Check the voltage, with
ignition on, at the coupling of
the towing vehicle. Load the
contacts using 12 V/ 55 W
bulbs while measuring.
- There must be approx. 12 V
between pins 1 and 4.
- Check the voltage of the
vehicle battery.
- Check all the contacts in the
trailer socket on the towing
vehicle and trailer for signs of
corrosion.
- Check all contacts in the
power plug of the trailer
modulator for corrosion.
- Check the connection cable
between the trailer modulator
and the trailer plug connector.
- Check the connection cable
between the towing vehicle
and the trailer.
- Perform the power supply
test.
14 251 5 Power
Supply
N/A Power
Supply
- Cl15
Interruption
When
Driving
The cable or socket
betweeen towing
vehicle and trailer is
faulty.
- The ground connection
between towing vehicle and
trailer was interrupted during
driving.
- Check whether the cable is
faulty.
14 251 6 Power
Supply
N/A Power
Supply - GIO
Overload
Total current
consumption of
GIO components is
too high.
- Check the current
consumption of each GIO
component connected and
identify the component(s)
which consumes high current.
- Disconnect one or more
GIO Functions to reduce total
current consumption.