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ELECTRONIC LINKAGE - Tests and diagnostics
CAB2: Control console and
CAB4: Height/depth adjustment potenti-
ometer
There is no test equipment available to test the control
console and the heig/depth potentiometer. It is recom-
mended that the initial diagnostic is carried out by
replacing the console and the potentiometer with
others units of correct condition.
If the problem still exists, check for open circuit on the
harness lines between the console connector and the
calculator connector, and, between the potentiometer
connector
and
the
section
11C13
for the pin out of these components).
CAB5 : Lift/Neutral/Lowering switch
1. Disconnect the switch.
2. With the MF 3005 multimeter set to «bleep»,
check the circuit between:
- pin 2 and pin 3 of the switch: with Lowering posi-
tion selected, a «bleep» should be obtained,
- pin 1 and pin 2 of the switch: with Lift position
selected, a «bleep» should be obtained.
If the problem still exists with a correct switch,
check for open circuit on the harness lines
between the switch connector and the calculator
connector (see section
these components).
CDX2, CDX3, CDX5 and CDX6: Lift and
Lowering external control switches
1. The harness 25 pin connector must be discon-
nected, the engine OFF and the ignition OFF.
2. With the MF 3005 multimeter set to «bleep»,
check the circuit between pin 12 on the 25 pin
connector and pin 10.
Press the Lift external control switches in turn: a
«bleep» should be obtained with each switch.
3. With the MF 3005 multimeter set to «bleep»,
check the circuit between pin 12 on the 25 pin
connector and pin 20.
Press the Lowering external control switches in
turn: a «bleep» should be obtained with each
switch.
11C12.4
calculator
connector
11C13
for the pin out of
TR4 and TR17: Lift and Lower solenoid
valve coils
The testing of the solenoid coils is a simple ohm test
across the winding of as follows:
1. Disconnect the harness connector from the coil.
2. Set the MF 3005 multimeter to ohms.
3. Connect the multimeter to the coil pins.
A reading of approximatly 1.6 ohms should be
obtained
If the coil proves faulty, replace the coil.
(see
TR19: Draft sensor
Supply voltage
1. Connect:
- the female connector of the test harness
3378077M1 to the sensor,
- the male connector to the tractor harness.
2. Connect pin 1 (-) and pin 3 (+) wires to the MF 3005
multimeter set to volts DC.
Ignition ON,
should be 9.5 VDC.
Checking voltage
3. Connect pin 2 (S) wire instead of pin 3 (+) wire on
the multimeter.
The checking voltage of the sensor is 50% of the
supply voltage with no load on the top link (there is
no adjustment possible). So the voltage reading
should be 4.75 VDC.
Pushing the link the voltage decreases (min.
value = 2.5 VDC). Pulling the link, the voltage
increases (max. value = 7.5 VDC).
engine OFF, the voltage reading
Massey Ferguson 5400 - Issue 1.a
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