WABCO 400 500 320 0, Maintenance Manual

Page: 164 / 188

164
Troubleshooting
Condition
Experienced
Action to Take Troubleshooting Detail
s
WABCO
Tire In fl ation
Communi-
cation
System is
not Broad-
casting a
"Low Tire
Pressure"
Message
When There
is a Fill Event
and the TIS
Light is Illum-
inated
Correct installation needs to be
veri fi ed.
Con fi rm WABCO TIS Communication System is
installed per Figures 9.26 and 9.28.
Make sure all electrical connections are fully seated.
ECU valve should audibly click
during its power-up self-test
ECU valve should audibly click during its power-
up self-test. ABS warning light will illuminate and
extinguish as a light test. If warning light remains on,
begin diagnostics with TOOLBOX PLUS™ Software. If
the ECU fails to click, ensure that the sensor extension
cables and power cables are securely attached to the
ECU and ensure that 12 volts is present at pin B-1 on
the ECU power connector. Refer to Figure 9.23.
Check continuity of the power
cable
Check continuity for the 449 306 XXX 0 cable from the
8-pin connector (Pin 5). Refer to Figure 9.23.
Check Meritor pigtail P/N
31184-00 (for Meritor Tire
In
fl ation System)
Check diode on pre-installed TIS cable pigtail. Place
the volt/ohm meter to “Diode”. Place red lead on
single male pin. Place the black lead on the dual tab
connector. Continuity should be observed on the
volt/ohm meter. Switching the leads in the opposite
direction, an “Open” should be displayed on the volt/
ohm meter. Refer to Figure 9.24.
Check jumper harnesses
P/N 449 025 XXX 0 (for
Hendrickson Tiremaax Tire
In
fl ation System)
Check diode on jumper harness. Place the volt/
ohm meter to “Diode”. Place red lead on pin A-A and
place the black lead on pin B-A. Continuity should be
observed on the volt/ohm meter. Switching the leads in
the opposite direction, an “Open” should be displayed
on the volt/ohm meter. Refer to Figure 9.29.
Inspect WABCO iABS part
number
Ensure that GIO-capable WABCO iABS is installed.
Only 400 500 350 0 and 400 500 430 0 have Tire
In
fl ation Communication System.
Verify the Tire In fl ation function
is activated in TOOLBOX
PLUS™ Software.
From the main screen of Trailer ABS diagnostics,
select the Modify pull-down. Select GIO con fi gurations
and active settings will be displayed.
"Low Tire
Pressure"
Message
is Being
Broadcasted
All the Time
Correct installation needs to be
veri fi ed.
Con fi rm WABCO TIS Communication System is
installed per Figures 9.26 and 9.28.
Make sure all electrical connections are fully seated.
Con fi rm TIS is incandescent
bulb or LED with load resistor
Replace light as necessary.
Ensure light is grounded correctly.
TIS LED
Does Not
Illuminate
During a Fill
Event
Correct installation needs to be
veri fi ed.
Con fi rm WABCO TIS Communication System is
installed per Figures 9.26 and 9.28.
Con fi rm TIS LED is not burned out.
Replace TIS LED as required per manufacturer
guideline.