Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 29)

26
Service Codes
Atmospheric (Code 35)
Atmospheric (Code 35)
Using the diagnostic tool, read
the atmospheric pressure.
Is the reading
between 5 and 20
psia?
Is any audible
air flowing through
the PCU?
Service code is not active. Re-
verify flowchart steps and wait
for fault to reoccur.
Is the reading
within range?
Disconnect ECU and
PCU sensor connectors.
Is there
continuity?
Inspect and repair faulty
harness or pins.
Disconnect harness from PCU sensor and plug new
PCU sensor onto harness (do not install new sensor
in PCU yet). Verify atmospheric reading.
Install new sensor in PCU.
Verify atmospheric reading.
Complete
Complete
Is the reading
within range?
Is the reading
within range?
Yes
No
No
Yes
Yes
No
Yes
Yes
Yes
No
No
No
Replace PCU and recheck system.
Note: While replacing the PCU, pay particular
attention to possible air line contamination (e.g.,
oil, water, particles) which may suggest further
air system maintenance needs.
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.
Check for continuity between:
PCU Sensor Harness ECU Harness
n i P r o t c e n n o C n i P r o t c e n n o C
A (round connector)
J (round connector)
or or
B (oval connector ) H3 (rectangular connector)