Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide User Manual

Page 35

Service Codes

PCU Sensor (Codes 33, 34)

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

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.

Replace PCU sensor.

Inspect and repair

faulty harness.

Inspect and repair

faulty harness.

Yes

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)

A (oval connector)

H2 (rectangular connector)

A (round connector)

J (round connector)

or or

B (oval connector)

H3 (rectangular connector)