New Holland CX720 Repair Manual page 3975

E0290-05-Lower Sieve Position Sensor Line Disconnected
(K.62.B.28.56 - G.30.B.50)
E0290-05 - Lower Sieve Position Sensor Line Disconnected
Cause:
The lower sieve position sensor (M-07) circuit is open or shorted to ground.
Possible failure modes:
1. Sensor signal wiring is open or shorted to ground.
2. Loss of power to the sensor.
3. Lower sieve position sensor failure (M-07).
Solution:
1. Verify the fault is present. Enter the Infoview monitor "Diagnose info" screen. Select the "CCM3" sort menu,
and select "Lower Sieve Position sens" to 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 proper voltage range is 0.3 - 5.2 volts .
A. If the voltage reading is < 0.3 volts , continue with Step 2.
B. If the voltage reading is within the proper limits, the circuit may not be open or shorted to ground at this
time. Continue the troubleshooting at Step 9.
NOTE: Visually inspect the wiring harness and connectors. Verify that each connector was fully installed. In-
spect the terminals and wires at each connector for pushed back or corroded terminals or damaged wires. Flex
the harnesses involved to reveal intermittent breaks or shorts in the wiring concerned.
2. Verify the power supply and ground function. Check for an E0293-04 - 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
X228 between pin B(-) and pin A(+).
A. 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 3.
B. If the voltage reads below 4.5 volts , then the fault is in the reference voltage circuit. Continue with Step 7.
3. Verify lower frame rear (LR) circuit 476 yellow is functioning. Measure the continuity between lower frame rear
(LR) harness connector X228 pin C and lower frame rear (LR) harness connector X072 pin M.
A. If continuity is found, continue troubleshooting at Step 4.
B. If the circuit is open, locate the open and repair. Continue troubleshooting at Step 9.
4. Verify straw walker (SW) circuit 476 yellow is functioning. Measure the continuity between straw walker (SW)
harness connector X072 pin M and straw walker (SW) harness connector X025 pin 4.
A. If continuity is found, continue troubleshooting at Step 5.
B. If the circuit is open, locate the open and repair. Continue troubleshooting at Step 9.
5. Verify expansion (EX) circuit 476 yellow is functioning. Measure the continuity between expansion (EX) harness
connector X025 pin 4 and expansion (EX) harness connector X013 pin 19.
A. If continuity is found, continue troubleshooting at Step 5.
B. If the circuit is open, locate the open and repair. Continue troubleshooting at Step 9.
6. Test lower sieve position sensor. Disconnect lower frame rear (LR) harness connector X228 from Lower Sieve
Actuator (M-07). Use a multimeter to measure resistance between pins A and C, then between pins B and C of
Lower Sieve Actuator (M-07).
CROP PROCESSING - CLEANING Primary cleaning
K.62.B / 263
2 4/7/2006