Case IH AFX8010 Repair Manual page 1589

Control valve Two speed valve - Unidentified failure (D.14.C.14.11 -
G.30.B.46)
AFX8010
E0059-11 - 2-Speed Front Hydro Valve
Cause:
The two speed powered rear axle solenoids (L-54/55) circuit open or is shorted to ground.
Possible failure modes:
1. Supply wiring shorted to ground or open circuit.
2. Controller internal failure (internal regulator failure).
Solution:
1.
Enter the Universal Display Plus "DIAG" screen. Select the "GROUND DRIVE" sort menu, and select
"DUAL RANGE 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 7.
2. Turn the key switch to the OFF position. Disconnect connector X454 at the 2 speed powered rear axle RH
solenoid L-54 and connector X455 at the 2 speed powered rear axle LH solenoid L-55. Use a multimeter to
check the resistance of each 2 speed solenoid coil. The proper resistance range for each coil is 1.0 - 8.0 ohms.
A.
If either coil is out of specification, replace coil.
B. If each coil is within specification, continue with Step 3.
3. Use a multimeter to check for continuity between connector X454 or X455 pin A and chassis ground. Flex the
2 speed PRA jumper harness while making this check.
A. If no continuity to ground is found, continue with Step 4.
B. If there is continuity to ground, continue with Step 6.
4. Turn the key switch to the ON position. Use the Universal Display Plus "DIAG" screen controls to manually
power the 2 speed PRA solenoids. Use a multimeter to check for 12 volts between connector X454 pin A and
chassis ground. Repeat the voltage check between connector X455 pin A and chassis ground.
A.
If 12 volts is not found at one of the connectors, there is an open circuit in the 2 speed PRA jumper
harness between the harness splice and the affected connector. Locate the open and repair.
B.
If 12 volts is not found, continue with Step 5.
C. If 12 volts is found, continue with Step 7.
5. Key switch to the ON position. Use the Universal Display Plus "DIAG" screen controls to manually power
the 2 speed PRA solenoids. Use a multimeter to check for 12 volts between connector X293 pin A and
chassis ground.
A. If 12 volts is not present, continue with step 8.
B. If 12 volts is found, there is an open circuit in the 2 speed PRA jumper harness between connector X293
and the 2 speed PRA jumper harness splice wire 762 white. Locate the open and repair.
6. Key switch to the ON position. Use the Universal Display Plus "DIAG" screen controls to manually power
the 2 speed PRA solenoids. Use a multimeter to check for 12 volts between connector X023 pin 21 and
chassis ground.
TRAVELLING - 2WD-4WD SYSTEM Hydraulic
9688 1 27/05/2004
D.14.C / 29