New Holland CX720 Repair Manual page 4055

E0015-05-Left Returns RPM Sensor Line Disconnected
(K.62.C.95.80 - G.30.B.50)
CX720 Series 1206 - 1237, CX740 Series 1206 - 1237, CX760 Series 1206 - 1237, CX780 Series 1206 - 1237, CX820 Series 1206 - 1237, CX840 Series
1206 - 1237, CX860 Series 1206 - 1237, CX880 Series 1206 - 1237
E0015-05 - Left Returns RPM Sensor Line Disconnected
NOTE: This troubleshooting chart is for CX combines Series 1206 - 1237 only.
Cause:
The left returns RPM sensor (B-06) circuit is open.
Possible failure modes:
1. Sensor supply wiring is open.
2. Controller internal failure (internal regulator failure).
Solution:
1. Enter the InfoView monitor - "Diagnose info" screen.
Select "CCM1" sub menu.
Select "Left Returns RPM sensor" and check voltage range.
The proper voltage for sensor unblocked by ferrous metal is 0.5 - 5.6 volts
The proper voltage for sensor blocked by ferrous metal is 5.6 - 7.3 volts
The proper voltage with sensor disconnected is 7.3 - 9.0 volts.
A. If the voltage reading is high 7.3 - 9.0 volts continue with Step 2.
B. If the voltage reading is within the proper limits, the open is not present at this time. Continue the trou-
bleshooting at step 5.
NOTE: Visually inspect the wiring harness and connectors. Verify that the connector was fully installed. Inspect
the terminals and wires at the 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. The voltage reading on the InfoView monitor is 7.3 - 9.0 volts. Disconnect the left returns RPM sensor connector
X181. Use a jumper wire to short the harness end of connector X181 pin 2 to chassis ground.
A. If the InfoView monitor drops to 0 - 0.5 volts indicating a ground, the open circuit is not in the supply side
of the circuit. Continue with step 3.
B. If the InfoView monitor still displays 7.3 - 9.0 volts, the open circuit is in the main frame (MF) harness
between connector X181 pin 2 and connector X019 pin J2-38 wire 433 yellow. Locate the open and
repair.
3. Disconnect the left returns RPM sensor connector X181. Use a multimeter to check for continuity between the
harness end of connector X181 pin 1 and chassis ground.
A. If there is continuity, the ground path for the sensor is complete, and the fault is in the sensor itself. Replace
the sensor.
B. If there is no continuity to ground, the ground path for the sensor is open. Continue with step 4.
4. Remove the cap and buss bar assembly from the splice block E, W05 in the main frame harness. Use a multi-
meter to check for continuity between the splice block E, W05 pin A and chassis ground.
A. If there is continuity, the open circuit is in the main frame (MF) harness between connector X181 pin 1 and
splice block E, W05 pin A wire 500 blue. Locate the open and repair.
B. If there is no continuity to ground, the open circuit is in the main frame (MF) harness between splice block
E, W05 pin A and connector X019 pin J2-14 wire 401 blue or 460 blue. Locate the open and repair.
5. Erase the error code and continue operation.
CROP PROCESSING - CLEANING Tailings return system
2 4/7/2006
K.62.C / 63