Spicer TPCS Troubleshooting Guide: Older Systems (ECU Manual de usuario descargar pdf (Pagina 38)

Troubleshooting

Code Description

Code 4P! displays if a channel inﬂates or deﬂates too slowly. The

maximum allotted time for each channel is 40 minutes for an inﬂate, or

20 minutes for a deﬂate. The most likely cause is a faulty compressor

or similar problem resulting in inadequate air supply to the Tire Pressure

Control System.

If the system is able to generate a sufﬁcient air supply, Code 4P! means

that a leak or restriction exists in an air passage. The components that

may contain a restricted or leaking air passage include:

• Wheel valve air ﬁlters

• Pneumatic Control Unit (PCU) vent port restriction

• Air supply lines

• Wheel valve exhaust port (deﬂate mode only)

To correctly diagnose the faulty component, connect the Diagnostic

Tool (see Section 5 for test equipment and descriptions) and follow the

procedure in the 3P! troubleshooting tree.

See “Troubleshooting Tips” on page 20 for general guidelines on system

diagnostics.

Code: 4P!

Type: Channel Between Modes

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Spicer TPCS Troubleshooting Guide: Older Systems (ECU Manual de usuario Pagina 38