WABCO iABS 2S/1M Standard, Maintenance Manual

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Troubleshooting
9.3 Axle Load Monitoring Troubleshooting
ECUs 400 500 350 and 400 500 430 0 (Premium iABS units) are the only trailer ABS ECU/valve
assemblies that have the capability of the Axle Load Monitoring feature being able to be activated and
turned on.
The fi rst step that should be taken when troubleshooting the Axle Load Monitoring system is to ensure that
the system is pneumatically plumbed correct and electric connections are also correct. Refer to Figures
9.20 and 9.21 in this section for the correct schematic, depending upon the override switch con
fi guration.
For additional information, refer to TP18055, Tag Axle Installation Manual, available at www.wabco-na.com.
When testing the system, ensure that 12-volts of DC power rated at a minimum of 10 amps is supplied to
the trailer’s constant power circuit.
Use of a volt-ohm meter may be required.
This troubleshooting section is based on the use of TOOLBOX PLUS™ Software version 13 or higher. If
you have an earlier version of the software, visit
wabco.snapon.com
to purchase and download the latest
version of the software.
Condition
Experienced
Action to Take
Troubleshooting Detail
s
Axle Load
Monitoring
Function
Unavailable
in TOOLBOX
PLUS™
Software
Inspect WABCO iABS part
number
Ensure that GIO-capable WABCO iABS is installed.
Only 400 500 350 0 and 400 500 430 0 have Axle Load
Monitoring functionality.
Verify the WABCO TOOLBOX
PLUS™ Software version
Ensure TOOLBOX PLUS™ software version 13.0 or
later is installed.
Faults are
present
when
Axle Load
Monitoring
Function Is
Activated
Using TOOLBOX PLUS™
Software, check the active
faults Repair and clear all active faults. Cycle the ECU power.
Pressure
Sensor is
not reading
the Pressure
Value
Check Pressure Sensor Cable
Connection at ECU
Check if Pressure Sensor Cable, P/N 449 826 XXX 0
is connected at GIO port 2. Refer to Figures 9.20 and
9.21 for correct installation.
Make sure that cable is fully seated and secured at
GIO port 2.
Ensure that pressure sensor is
not under torqued
Tighten the pressure sensor to 27 ±1.47 lb-ft
(37 ±2 Nm).
Ensure that pressure sensor is
not over torqued
Tighten the pressure sensor to 27 ±1.47 lb-ft
(37 ±2 Nm).
Retrieve diagnostic information
via TOOLBOX PLUS™
Software.
Check for active faults with TOOLBOX PLUS™
Software and repair all faults found.