Spicer TPCS (Tire Pressure Control System) Service Manual - Manual (Page 17)

17
Electrical Service
Replacement Procedures
Electronic Control Unit Replacement
1. Turn off the vehicle’s ignition and engine.
2. Locate the Electronic Control Unit. The Electronic
Control Unit is typically mounted in the cab behind
the passenger seat.
3. Use a hex driver to disconnect the two wire harness
connectors.
4. Remove the Electronic Control Unit.
5. Mount the new Electronic Control Unit.
6. Connect the wire harness.
7. Start the vehicle and test the Tire Pressure Control
System.
Operator Control Panel Replacement
1. Turn off the vehicle’s ignition and engine.
2. Locate the Operator Control Panel. The Operator
Control Panel is typically mounted in the cab on the
dash where the driver can easily access it.
3. Remove the four mounting screws and carefully pull
the Operator Control Panel through the dash.
4. Disconnect the wire harness connector from the
Operator Control Panel.
5. Connect the wire harness to new Operator Control
Panel.
6. Mount the new Operator Control Panel with the
existing mounting hardware.
7. Start the vehicle and test the Tire Pressure Control
System.
Operator Control Panel Back Lamp Removal
1. Turn off the vehicle’s ignition and engine.
2. Locate the Operator Control Panel. The Operator
Control Panel is typically mounted in the cab on the
dash where the driver can easily access it.
3. Remove the four mounting screws and carefully pull
the Operator Control Panel through the dash.
4. Disconnect the wire harness connector from the
Operator Control Panel.
5. Remove back cover by pressing in the two tabs
opposite the connector end.
6. With back cover off, place the Operator Control
Panel face down with the connector to the right.
Note: Lamp is located in the top left hand corner.
7. To remove lamp, insert small screwdriver in back
of lamp and turn counterclockwise 1 /
4
turn to
remove.
To install Operator Control Panel bulb, (part
number 5559106) reverse removal procedures.
Pressure Transducer
1. Turn off the vehicle’s ignition and engine.
2. Disconnect electrical connectors at Pneumatic
Control Unit cover.
3. Remove the Pneumatic Control Unit Cover and
locate the pressure transducer.
4. Disconnect the wire harness connector from the
pressure transducer.
5. Unscrew the pressure transducer and remove.
6. Screw new pressure transducer into the Pneumatic
Control Unit and tighten to 10–12 lbs. ft.
(14–16 N•m).
7. Connect the internal wire harness connector to the
pressure transducer and install protective cover.
Torque cover fasteners to 35-45 lbs. in. (4-6 N•m).
8. Reconnect the Pneumatic Control Unit harness
connector to the proper cover positions.
9. Start the vehicle and test the Tire Pressure Control
System.
Note: When repairs to the Pneumatic Controller have
been completed, the servicing technician should assure
proper system function before putting vehicle back in
service. As a minimum, the system should be inflated
using the Operator Control Panel to achieve the high-
way loaded setting and then deflated until the off-
highway loaded setting is achieved.