Troubleshooting
Teledyne Continental Motors, Inc.
TM
8-13.
Cabin Harness Functional Check
The functional check of the cabin harness consists of several procedures and must be
performed before making the final connection of FADEC System components. The four
procedures that comprise the functional checks follow in subsequent subsections:
•
Electrical Ground Check
•
Enable Switch Check
•
Power Supply Check
•
Boost Pump Relay Check
8-13.1. Electrical Ground Check
Procedure
1.
Master Power Switch ................................... OFF
2.
FADEC Primary Power Switch ................... OFF
3.
FADEC Secondary Power Switch ............... OFF
4.
Ignition Switch............................................. OFF
5.
Use a Digital Volt-ohm Meter (DVM) to measure between aircraft ground and the
pins designated in the connector pin layout tables for P6, P7, and P8 respectively for
Figure 8-2 through Figure 8-4.
Connector Resistance Readings
Connector
Resistance
Readings
Plug Pin
Label
Resistance
Plug Pin
Label
Resistance
P6, P7, or P8
B
Ground
< 0.5
P6 or P7
B
Ground
< 0.5
P6, P7, or P8
D
Ground
< 0.5
P6 or P7
D
Ground
< 0.5
P6, P7, or P8
J
Enable
< 0.5
P6 or P7
E
Ground
< 0.5
P6, P7, or P8
K
Enable
< 0.5
P6 or P7
L
Enable
< 0.5
P6 or P7
S
Ground
< 0.5
P6 or P7
N
Enable
< 0.5
P6 or P7
V
Ground
< 0.5
P6 or P7
P
Enable
< 0.5
B C
N P R
Figure 8-2.
P6 Connector Pin Layout
P6 Connector Signals
P6 Connector Signals
A
Primary Power
L
Mix 12 SIG
A
Primary Power
L
Enable A
B
Ground
M
Mix 12 RET
B
Ground
M
Fault 1
C
Secondary Power
N
Fuel Pump
C
Primary Power
N
Enable A
D Ground
P NC*
D Ground
P Fault
3
E
RS485A
R
Primary Power
E
Primary Power
R
Enable A
F RS485B
S Ground
F Ground
S Fault
5
G Fault
A
T *NC
G RS485A
T Mix
12
H
Fault B
U
Secondary Power
H
RS485B
U
Fuel Pump 1
J Enable
A
V Ground
J RS485A
V *NC
K Enable
B
K RS485B
*NC – Not Connected
B C
N P R
8-36
IOF-550 Permold Series Engine Maintenance Manual
1 April 2007
