Spicer TPCS Troubleshooting Guide - Manual (Page 26)

23
Service Codes
Group: 4C! (Code 15)
Type: Display Control Communications
Code Description
Group 4C! indicates a communication problem between the
Electronic Control Unit (ECU) and the driver interface (either
the Driver Display Module or Operator Control Panel). Code
4C! will only be observable on a diagnostic tool as code 15. It
will not show on the Operator Control Panel. Instead, the
Operator Control Panel may be blank (indicating a power
problem).
All of the troubleshooting steps for code 4C! involve checking
the condition of Electronic Control Unit and driver interface
circuits. If no circuit problems are found, Code 4C! indicates
either a faulty driver interface or a faulty Electronic Control
Unit.
See "Troubleshooting Tips" for general guidelines on system
diagnostics.
System Mode Condition Possible Causes
(Listed in Likely Order of Occurrence)
Inflate Only Blank Display - No power to Driver Interface.
- No ground connection to Driver Interface.
- System voltage out of range (9-19 volts DC).
Inflate Only Operator Control Panel
displays logo only
DDM displays dash dash
(nothing else on display)
- No power or ground to ECU.
- Driver Interface to Electronic Control Unit lines open.
- Driver Interface to Electronic Control Unit lines shorted to ground.
- Driver Interface to Electronic Control Unit lines shorted to power.
- Driver Interface to Electronic Control Unit lines shorted together.
- Faulty Driver Display Module/Operator Control Panel.
- Faulty Electronic Control Unit.
ECU Harness Connector
A B
G
3
2
1
A
A
B
B
C
C
C
D
D
D
E
E
E
F
F
F
G
G H J K
H
H
J
J
K
K
OCP Harness Connector
5 6 9 10 8
6
7
8
9
10
3
2
1
4
5
DDM Display Harness Connector