Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Chapter:
Issue:
Issue Date:
Page:
Content:
20-AMM-71-02
3
06.11.2013
24
46
Rev. No:
Rev. Date:
1
25.08.2014
Troubleshooting the Wiring Harness
To troubleshoot the harness, unplug the connector in question,
and perform the following measurements to verify functionality of
the harness. If the harness fails the test, repair the connector as
necessary.
If there is any damage to the harness other than
directly at the connector, it must be replaced
. Move the end
of the connector while performing the measurements to show any
intermittent loss of continuity.
Table 71-17a Troubleshooting Wiring Harness / Connector Table
Input
From
To
Unit
Nominal Value
Temperatures (T
Gear, T Oil, T
Coolant, T Air)
Connector Gnd
(Pin 2)
Gnd
Resistance
(Ensure FADEC
power is off)
0
Connector Signal
Pin (Pin 1)
5 V Supply (Pin
xx of nearest
Pressure
connector)
Resistance(Ensur
e FADEC power
is off)
3 k
Connector Signal
Pin (Pin 1)
Connector GND
(Pin 2)
Voltage (Ensure
FADEC power is
on)
5 V
Pressure (P Oil);
Load
Connector Gnd
(Pin 1)
Gnd
Resistance
(Ensure FADEC
power is off)
0
Connector Signal
(Pin 3)
Connector GND
(Pin 1)
Resistance
(Ensure FADEC
power is off)
47 k
Connector Power
Supply (Pin 2)
Connector GND
(Pin 1)
Voltage (Ensure
FADEC power is
on)
5 V
Crank Sensor
Connector GND
(Pin 2)
Gnd
Resistance
(Ensure FADEC
power is off)
0
Connector Signal
(Pin 1)
Connector Gnd
(Pin 2)
Resistance
(Ensure FADEC
power is off)
10 k
Содержание Cessna 172
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