Sensing System Left Tool Position Sensor - Short Circuit To Ground - Case IH AFX8010 Repair Manual

Sensing system Left tool position sensor - Short circuit to ground

(G.10.A.95.82 - G.30.B.53)
AFX8010
E0020-04 - Left Header Height / Tilt Sensor
Cause:
The left height/tilt sensor (R-12) circuit is shorted to ground.
Possible failure modes:
1. Sensor signal wiring is shorted to ground.
2. Module internal failure (internal regulator failure).
Solution:
1.
Enter the Universal Display Plus "DIAG" screen. Select the "HDR HEIGHT/TILT" sort menu, and select
"LEFT SEN" to check the voltage range. Manually raise and lower the header against the ground several
times while monitoring the voltage; the voltage should stay within range, and should change smoothly with
header sense plate movement.
The voltage range for a properly adjusted sensor is 0.2 - 4.7 volts.
A. If the voltage reading is low (<0.2 volts) out of range, 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.
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.
Disconnect connector X305, and use a multimeter to test for continuity between connector X305 pin 2 and
chassis ground. There should not be continuity to ground.
A.
If there is no continuity to ground, continue with Step 5.
B. If there is continuity to ground, continue with Step 3.
3. Disconnect connector X032, and use a multimeter to test for continuity between the feeder (FE) harness end
of connector X032 pin 1 and chassis ground. There should not be continuity to ground.
A. If there is no continuity to ground, there is a short to ground in the header (HH) harness between
connector X305 and connector X032 wire 738 yellow. Locate the short and repair.
B.
If there is continuity to ground, continue with Step 4.
4.
Disconnect connector X007, and use a multimeter to test for continuity between the front frame (FF) harness
end of connector X007 pin 15 and chassis ground. There should not be continuity to ground.
A.
If there is continuity to ground, there is a short to ground in the front frame (FF) harness between
connector X007 pin 15 and connector X020 pin J3-24 wire 738 yellow. Locate the short and repair.
B.
If there is no continuity to ground, there is a short to ground in the feeder (FE) harness between
connector X032 pin 1 and connector X007 pin 15 wire 738 yellow. Locate the short and repair.
5. Operate the machine while monitoring the Universal Display Plus "DIAG" screen.
A.
If no low out of range readings are indicated, erase the fault code and continue operation.
TOOL POSITIONING - LIFTING
9706 1 27/05/2004
G.10.A / 42