Case IH AFX8010 Repair Manual page 1644

Sensing system Pressure sensor - Short circuit to B+ (D.32.C.95.81
- G.30.B.54)
AFX8010
E0155-03 - Park Brake Pressure Sensor
Cause:
The park brake pressure sensor (B-53) circuit is shorted to 12 volts.
Possible failure modes:
1. Switch supply wiring shorted to 12 volts.
2. Controller internal failure (internal regulator failure).
Solution:
1.
Enter the Universal Display Plus "DIAG" screen. Select the "BRAKES" sort menu, and select "PARK PRESS
SEN" to check the voltage range.
The proper voltage range for the park brake pressure sensor (key ON, engine OFF) is - 0.5 - 0.8 volts.
The proper voltage range for the park brake pressure sensor (key ON, engine Running, park brake OFF) is
- 0.8 - 4.9 volts.
A. If the voltage reading is high out of range (>5.2 volts), continue with Step 2.
B. If voltage is normal, the shorted wire may not be energized at this time. Continue with 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.
Disconnect the park brake pressure sensor connector X368. Use a multimeter to check for voltage on
connector X368 pin B. There should be 5 volts present.
A.
If high (>5.5 volts) voltage is found, the regulated voltage supply is incorrect. The error "
E0165-03 - CCM2 J2 5V Reference
" should be listed in the Universal Display Plus "ERROR" screen. Correct that error, and then check to
determine if this error has been resolved.
B. If correct voltage is found, continue with Step 3.
3. Disconnect the park brake pressure sensor connector X368. Use a multimeter to check for continuity between
connector X368 pin A and chassis ground.
A. If continuity is found, continue with Step 4.
B. If there is no continuity, there is an open circuit in the main frame (MF) harness between connector X368
pin A and connector X016 pin J2-14 wire 1198 blue or 465 blue. Locate the open and repair.
4. Disconnect the park brake pressure sensor connector X368. Use a multimeter to check for voltage on
connector X368 pin C.
A. If no voltage is found, continue with Step 9.
B. If high (>5.2 volts) voltage is found, continue with Step 5.
5. Disconnect the front frame (FF) harness from the main frame (MF) harness at connector X008. Use a
multimeter to check for voltage on connector X008 pin 7.
A. If no voltage is found, there is a short in the main frame (MF) harness between connector X368 pin C
and connector X008 pin 7 wire 1197 yellow. Locate the short and repair.
TRAVELLING - PARKING BRAKE Hydraulic
9691 1 27/05/2004
D.32.C / 28