Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide User Manual
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32
Service Codes
PCU Sensor (Codes 33, 34)
PCU Sensor (Codes 33, 34)
No
With ignition off, inspect socket
connections at ECU connector
and at PCU sensor 3-way.
Are connections
mechanically and
electrically sound?
Repair connection
as necessary.
Disconnect the ECU connector
and the PCU sensor connector.
Is there
continuity?
Check for short circuits between each
pair of PCU sensor harness pins:
A and B
B and C
C and A
A
Are any
shorted?
With ignition switch on, check
voltage between PCU sensor
harness pin B (round
connector) or pin A (oval
connector) and ground.
Is voltage
between 4.9 and
5.1 V?
Is the active
fault cleared?
Complete
Replace ECU and recheck system.
Note: ECUs are not a typical cause of problems. If
an ECU is replaced, the system should be carefully
rechecked to make sure the problem has been
fixed and does not reoccur.
A
Replace PCU sensor.
Inspect and repair
faulty harness.
Inspect and repair
faulty harness.
No
Yes
Yes
No
Yes
Yes
Yes
No
No
Check for continuity between the following points:
PCU Sensor Harness Connector Pin ECU Harness Connector Pin
c (round connector)
C (all connectors)
or
H1 (rectangular connector)
B (round connector)
b (round connector)
or
or
A (oval connector)
H2 (rectangular connector)
A (round connector)
J (round connector)
or or
B (oval connector)
H3 (rectangular connector)