Spicer TPCS Troubleshooting Guide User Manual

Page 33

Service Codes

Group: 1P! (Codes 11, 12,

13
, 16
, 22
)

No Deflate Signal (Codes 11, 12, 13, 16, 22)

Using the diagnostic tool, test

vacuum in isolated PCU.

Is the PCU

vent line plugged or

restricted?

Replace PCU and recheck

system.

Refer to Service Manual

Initiate deflate mode on the steer

channel. Record the reading.

Repair PCU restriction and

recheck system.

Refer to Service Manual

Is the vacuum

> 20" Hg?

Initiate pressure check and hold on
steer channel.
Check all air lines and fittings for leaks
as well as exhaust port of wheel valves.
Make repairs to faulty components.

Problem is a cumulative effect

of individual channel leaks.

Initiate inflate pressure hold on channel
with the lowest vacuum reading.
Check for leaks.
Make repairs to faulty components.

Verify by initiating deflate

mode on repaired channels.

Initiate deflate mode on the drive

channel. Record the reading.

Is the vacuum

> 20" Hg?

Initiate pressure check and hold on
drive channel.
Check all air lines and fittings for leaks
as well as exhaust port of wheel valves.
Make repairs to faulty components.

Initiate deflate mode on the trailer

channel. Record the reading.

Is the vacuum

> 20" Hg?

Initiate pressure check and hold on
trailer channel.
Check all air lines and fittings for leaks
as well as exhaust port of wheel valves.
Make repairs to faulty components.

Note: Line leakages occasionally occur which are unidirectional; i.e., they might occur under vacuum and not pressure (or vice-versa).
Inability to determine the cause of vacuum loss on an individual channel may dictate replacement of air lines and/or fittings on that
channel. Be sure all replaced air lines and fittings are identical in all respects, including length, to the parts replaced.

Is the vacuum

< 6" Hg?

Yes