New Holland CX720 Repair Manual page 3969

E0287-03-Upper Sieve Position Sensor Shorted To High Source
(K.62.B.28.55 - G.30.B.54)
E0287-03 - Upper Sieve Position Sensor Shorted To High Source
Cause:
The Upper Sieve Position sensor (M-06) circuit is shorted to high voltage, or the sensor ground is open.
Possible failure modes:
1. Sensor supply or signal wiring is shorted to high voltage >5.2 volts .
2. Sensor ground wiring is open.
3. Module internal failure (internal regulator failure).
Solution:
1. Verify the fault is present. Enter the Infoview monitor "Diagnose info" screen. Select the "CCM3" sort menu, and
select "Upper Sieve Position sensor" and observe the voltage. Raise and lower the sieves several times while
monitoring the voltage; the voltage should stay within range, and should change smoothly with sieve movement.
The normal operating range is 0.3 - 5.2 volts .
A. If the voltage reading is >5.2 volts , continue with Step 2.
B. If the voltage reading is within the proper limits, the circuit may not be shorted at this time. Continue the
troubleshooting at Step 5.
2. Verify the power supply and ground function. Check for an E0293-03 - CCM3 5V Ref Voltage 3 fault. If present,
correct that fault and resume operation. Disconnect and measure the voltage at lower frame rear (LR) connector
X227 between pin B(-) and pin A(+).
A. If the voltage is <4.5 volts , there is an open in the ground circuit. Continue with Step 3.
B. If the voltage reads between 4.5 - 5.5 volts , then the CCM3 5 V REF and circuit ground function properly.
The fault is in the sense circuit. Continue with Step 4.
3. Check for multiple faults on common circuits. If fault codes E0287-03 , E0290-03 , and E0289-03 (if installed)
are all active, the fault will most likely be found between Chassis Control Module (CCM) 3 and straw walker
(SW) harness connector X072 .
A. If these fault codes are all present, then check the continuity between straw walker (SW) harness con-
nector X072 pin F wire 795 blue and straw walker (SW) harness connector X025 pin 2 wire 439 blue.
Also check the segment from expansion (EX) harness connector X025 pin 2 to expansion (EX) harness
connector X013 pin 14. Locate and repair the open. Continue with Step 5.
B. If only one code is present, then check the continuity between lower frame rear (LR) harness connector
X227 pin B and straw walker (SW) harness connector X072 pin F. Also check the segment from straw
walker (SW) harness connector X072 pin F to straw walker (SW) harness connector X025 pin 2. Locate
and repair the open. Continue with Step 5.
4. Verify the sense circuit function. Disconnect and then measure the voltage at lower frame rear (LR) connector
X227 between pin B(-) and pin C(+).
A. If the voltage reading is >5.2 volts , then there is a voltage source shorted to this circuit. Observe the "Up-
per Sieve Position sensor" voltage on the Infoview monitor. Disconnect lower frame rear (LR) connector
X072 and note if the voltage drops. Repeat for expansion (EX) harness connector X025. Locate the short
and repair. Reconnect all harness connectors. Continue with Step 5.
B. If the above steps have not located the problem, then replace CCM3. Continue with Step 5.
5. Visually inspect the harness and connectors for damage, bent or dislocated pins, broken or pinched wires.
A. Repair any damage found during visual inspection.
CROP PROCESSING - CLEANING Primary cleaning
K.62.B / 257
2 4/7/2006