DANA-AXTS0015
DANA SPICER CTIS (CENTRAL TIRE INFLATION SYSTEM)
TROUBLESHOOTING GUIDE
JULY 2010
DANA-AXTS0015 - Page 34 of 72
31
Service Codes
5 Flashing Lights or DDM – Dashes "--"
(Codes 33, 34)
Type: PCU Sensor
Code Description
A "Pneumatic Control Unit (PCU) Sensor" code occurs when
the Electronic Control Unit (ECU) receives an unusually high
or low reading from the PCU sensor. A diagnostic tool will
specify which of the two conditions is responsible for setting
the code.
Initial troubleshooting steps involve checking for a shorted-
to-ground or an open PCU sensor circuit.
If the circuits check out OK, secondary causes could involve a
faulty sensor or a faulty ECU.
See “Troubleshooting Tips” for general guidelines on system
diagnostics.
System Mode
Condition
Possible Causes (listed in order of likely occurrence)
No operation
No PCU sensor reading
• Sensor electrically disconnected
• Pressure signal wire open
• Pressure signal wire shorted to ground
• PCU sensor VREF wire open
• PCU sensor VREF wire shorted to ground
• PCU sensor ground wire open
• Faulty sensor
• Faulty ECU
No operation
High PCU sensor reading
• Pressure signal wire shorted to VBAT or VREF
• Faulty sensor
• Faulty ECU
PCU
S
e
ns
o
r
Ha
rn
e
ss
Co
nn
ecto
r
T
S
A
B
C
U
R
P
a
b
c
V
D
E
F
G
W
H
X
J
K
Y
L
M
Z
N
ECU Ha
rn
e
ss
Co
nn
ecto
r
ABCDE
ABCDE
ABCDE
FGHJK
3
2
1
FGHJK
FGHJK
CA
B
A
B
C
– o
r
–
– o
r
–
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