New Holland CX720 Repair Manual page 2830

E0066-11-Rear Wheel Assist Valve Unidentified Failure Code
(D.14.E.05 - G.30.B.46)
E0066-11 - Rear Wheel Assist Valve Unidentified Failure Code
Cause:
The rear wheel assist (L-26) circuit open, or is shorted to ground.
Possible failure modes:
1. Circuit connection/wiring damaged between CCM1 and rear wheel assist solenoid.
2. Controller internal failure (internal regulator failure).
Solution:
1. Enter the Info View Monitor - "Diagnose info" screen.
Select "Driveline" sub menu.
Select "Rear Wheel Assist valve" and select the "Status" screen. Press the "Enter" key to manually power the
circuit.
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. Turn the key switch to the OFF position and disconnect the rear wheel assist connector X233.
A. Use a multimeter to check the resistance of the rear wheel assist coil. The proper resistance range for the
coil is 1.0 - 8.0 ohms. If out of specification replace coil.
B. If the coil is within specification continue with Step 3.
3. Use a multimeter to check for continuity between connector X233 pin A and chassis ground. Flex the 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 7.
4. Disconnect connector X233. Turn the key switch to the ON position. Use the InfoView - "Diagnose info" screen
to manually power the rear wheel assist. Use the multimeter to check for 12 volts between connector X233 pin
A and chassis ground.
A. If 12 volts is not present continue with Step 5.
B. If 12 volts is found continue with Step 10.
5. Key switch to the ON position. Use the InfoView - "Diagnose info" screen to manually power the rear wheel
assist. Use the multimeter to check for 12 volts between connector X072 pin A and chassis ground.
A. If 12 volts is not present continue with Step 6.
B. If 12 volts is read the open is between connector X072 and connector X233 wire 569 white. Locate the
open and repair.
6. Key switch to the ON position. Use the InfoView - "Diagnose info" screen to manually power the rear wheel
assist. Use the multimeter to check for 12 volts between connector X024 pin 15 and chassis ground.
A. If 12 volts is not present the open is between connector X024 and connector X019 J2-16 wire 569 white.
B. If 12 volts is read the open is between connector X024 and connector X072 wire 569 white. Locate the
open and repair.
TRAVELLING - 2WD-4WD SYSTEM Hydrostatic
2 4/7/2006
D.14.E / 76