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Control valve - Unidentified failure (D.32.C.14 - G.30.B.46)
AFX8010
E0181-11 - Park Brake Valve
Cause:
The park brake valve (L-10) circuit is open, or shorted to ground.
Possible failure modes:
1.
Supply wiring damaged.
2.
Bad solenoid.
3.
Controller internal failure (internal regulator failure).
Solution:
1.
Enter the Universal Display Plus "DIAG" screen. Select the "BRAKES" sort menu, and select "PARK VLV".
Change the drop-down list to "STATUS", and press the "OFF" button to change the circuit output to "ON".
The "STATUS" screen should indicate "OK" if the circuit is working properly.
A.
If the status screen indicates "ERROR", the circuit is open or shorted to ground. Continue with Step 2.
B.
If the status screen indicates "OK", the circuit is working properly. Continue with Step 9.
2.
Disconnect connector X457. Use a multimeter to check between connector X457 pin 1 (valve side) and
chassis ground.
A.
If there is continuity, the park brake disengage solenoid is shorted to ground. Replace the solenoid.
B.
If there is no continuity, continue with Step 3.
3.
Use a multimeter to check for continuity between connector X457 pin 1 (harness side) and chassis ground.
A.
If there is continuity to ground, the short to ground is in the main frame (MF) harness between connector
X457 and connector X016 J2-15 wire 572 white. Locate the short and repair.
B.
If there is no continuity to ground, continue with Step 5.
4.
Disconnect connector X457. Use a multimeter to check the resistance of the park brake disengage valve coil
between connector X457 pins 1 & 2. The proper resistance range is 7.2 - 11.2 ohms.
A.
If there is no continuity, replace solenoid.
B.
If the coil is within specification, continue with Step 6.
5.
Use a multimeter to check for continuity between connector X457 pin 2 (harness side) and chassis ground.
A.
If there is no continuity to ground, there is an open circuit in the main frame (MF) harness between
connector X457 pin 2 and the front frame ground #2 wire 605 black. Locate the open and repair.
B.
If there is continuity to ground, continue with Step 7.
6.
Turn the key switch to the ON position. Use the Universal Display Plus "DIAG" screen controls to manually
power the park brake valve. Use a multimeter to check for 12 volts between connector X457 pin 1 and
chassis ground.
A.
If 12 volts is not present, there is an open circuit in the main frame (MF) harness between connector
X457 and connector X016 pin J2-15 wire 572 white. Locate the open and repair.
B.
If 12 volts is found, continue with Step 9.
7.
Visually inspect the harness and connectors for damage, bent or dislocated pins, corroded terminals or
broken wires.
TRAVELLING - PARKING BRAKE Hydraulic
9691 1 27/05/2004
D.32.C / 22
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