New Holland CX720 Repair Manual page 3209

E0512-03-Feeder Angle sensor Shorted to High Source
(G.10.A.95.80 - G.30.B.46)
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
E0512-03 - Feeder Angle sensor Shorted to High Source
NOTE: This troubleshooting chart is for CX combines Series 1206 - 1237 only.
Cause:
The feeder angle sensor (R-03) 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 (12 V).
2. Sensor ground wiring is open.
3. Module internal failure (internal regulator failure).
Solution:
1. Enter the InfoView™ monitor - "Diagnose info" screen.
Select "Header" sub menu.
Select "Feeder Angle Sensor" and check voltage range. Fully raise and lower the feeder several times while
monitoring the voltage; the voltage should stay within range, and should change smoothly with feeder move-
ment.
The proper voltage range for a properly adjusted sensor is 2.5 - 7.5 volts.
A. If the voltage reading is high (7.7 - 12.0 volts) out of range continue with Step 2.
B. If the voltage reading is out of range, but between 2.0 - 7.7 volts, the sensor is operating properly, but
needs to be adjusted into the proper range.
C. If the voltage reading is within the proper limits, the circuit may not be shorted at this time. Continue the
troubleshooting at step 9.
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 low out of range. Disconnect connector X174 , and use a
multimeter to test for continuity to ground on connector X174 pin 1 .
A. If continuity is found, continue with step 4.
B. If no continuity is found, continue with step 3.
3. Disconnect connector X281 from the HHC module. Use a multimeter to test for continuity between connector
X174 pin 1 and connector X281 pin 4 .
A. If continuity is found, the HHC module is not supplying a ground path for the sensor. Use the Service Info
- Network screen to verify that the HHC module is online. If the HHC module is online, and other hydraulic
functions are operating, replace the HHC module.
B. If no continuity is found, there is an open circuit in the main valve stack (MV) harness or main frame (MF)
harness between connector X174 pin 1 and connector X281 pin 4 on one of the following wires:
Wire 756 blue, connector X174 pin 1 to MF harness splice
Wire 546 blue, MF harness splice to connector X022 pin K
Wire 546 blue, connector X022 pin K to MV harness splice
Wire 472 blue, MV harness splice to connector X281 pin 4
Locate the open and repair.
TOOL POSITIONING - LIFTING
2 4/7/2006
G.10.A / 43