STACK ST8120 Display System
Chapter 5. Installing the Display System
User Guide Addendum
15
Chapter 6. Troubleshooting
Use this table in conjunction with the ST8100 manual.
No.
Symptom
Possible Cause
Remedy
Notes
1
Boost shows -9.99
(Bar) or -99.9 (psi)
ST453 sensor
disconnected
Reconnect
Faulty connections Check connections Refer to harness
diagram
ST453 faulty
Return for service
2
Boost shows 0.00
(Bar) or 0.0 (psi)
approximately
ST453 not
connected to
intake correctly
Check hose and
fittings
3
Boost display
incorrect or
inaccurate
Units (PSI/Bar) set
wrongly
Modify setting
1 Bar is about
14.5 psi
4
Air Temperature
Display gives a fixed
temperature reading
of 999
°
C or 999
°
F
Air Temperature
sensor has failed
Replace sensor
Disconnect
sensor. If reading
changes to -99,
replace sensor
Faulty sensor
connections
Check continuity
of sensor leads
Otherwise check
harness for short
circuit
5
Air Temperature
shows -99
°
C or
ST765
temperature
sensor has failed
Replace sensor
-99
°
F when air
temperature is
above 0
°
C or 0
°
F
Faulty sensor
connections
Check continuity
of sensor leads for
open circuits.
Check harness
for open circuits
(refer to the
harness diagram)
6
Fuel Pressure
display shows an
incorrect reading
Wrong FUELP
SENSOR setting
Modify setting
ST741,ST742
are 30psi/2Bar.
Other sensors
are 150psi/10Bar
