Spicer TPCS Troubleshooting Guide Bedienungsanleitung PDF herunterladen (Seite 30)

Service Codes

Group: 12C! (Codes 51, 52, 53, 54, 55, 56)

Type: PCU Solenoids

• Front (51)

• Rear (52)

• Trailer (53)

• Supply (54)

•Deflate (55)

• Control (56)

Code Description

Group 12C! indicates an electrical fault in the Pneumatic

Control Unit (PCU). Codes 51 through 56 specifically

designate which solenoid in the PCU

is faulty. System

operation is disabled when this fault is detected.

The system shuts down in a fail-safe mode

and turns off

power to the solenoids.

The troubleshooting tree first tests internal solenoid circuitry.

Res

istance outside the specified range of 7 to 25 ohms

indicates a defective solenoid. Successive steps check

continuity of the wire harness circuits between the Pneumatic

ntrol Unit and the Electronic Control Unit (ECU). If the

problem can be traced to a faulty circuit or connector, make

the necessary repairs. If the troubleshooting routine leads to a

problem with the solenoid itself, the Pneumatic Control Unit

must be repaired or replaced. If both the solenoid and the

circuitry check out, the Electronic Control Unit is faulty.

See "Troubleshooting Tips" for general

guidelines on system

diagnostics.

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

No operation Pneumatic Control Unit

solenoid failed electrical

diagnostic test

- Connector unplugged or faulty wiring.

- Solenoid wire open.

- Solenoid wire shorted to ground.

- Solenoid wire shorted to power.

- Faulty solenoid.

- Faulty Electronic Control Unit.

ECU

Harness Connector

A B

GHJK

PCU Harness

Connector

ABCD E

KHGF

PCU Connector

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 75 76

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