New Holland CX720 Repair Manual page 2540

E0202-11-Ground Speed Hydrostat Unidentified Failure Code
(C.20.F.05.07 - G.30.B.46)
E0202-11 - Ground Speed Hydrostat Unidentified Failure Code
Cause:
The ground speed hydrostat valve (L-23) circuit is shorted to ground.
Possible failure modes:
1. Supply wiring damaged.
2. Bad solenoid.
3. Controller internal failure (internal regulator failure).
Solution:
1. Enter the Infoview monitor - "Diagnose info" screen.
Select "CCM2" sub menu.
Select "Ground Speed Hydrostat" and select the check voltage range.
The proper ground speed hydrostat valve control voltage is as follows:
Handle in neutral - 0 V.
Handle full forward - 4.4 V.
Handle full rearward - 2.5 V.
Error is indicated at 4.7 V.
A. If the voltage reading is high (>4.7 V in either forward or reverse), continue with step 2.
B. If the readings are within the proper ranges, continue with Step 10.
2. Turn the key switch to the OFF position. Disconnect the ground speed hydrostat valve connector X100. Use
a multimeter to check the resistance of the ground speed hydrostat valve coil between terminals D and C. The
proper resistance range for the ground speed hydrostat valve coil L23 is 16 - 20 K Ohms.
A. If out of specification, replace the solenoid.
B. If the coil is within specification, continue with Step 3.
3. Use a multimeter to check for continuity between the ground speed hydrostat valve coil connector terminals D
or C and chassis ground. There should not be continuity to ground.
A. If there is continuity, replace the solenoid.
B. If there is no continuity to ground, continue with Step 4.
4. Use a multimeter to check for continuity between connector X100 pin D and chassis ground. Flex the harness
while making this check.
A. If there is continuity to ground, continue with Step 5.
B. If there is no continuity to ground, continue with Step 7.
5. Disconnect connector X011. Use the multimeter to check for continuity between connector X011 pin Q and
chassis ground.
A. If there is no continuity to ground, a short to ground is located in the gearbox (GB) harness between
connector X011 and connector X100 wire 880 white. Locate the short and repair.
B. If there is continuity to ground, continue with step 6.
6. Disconnect inline connector X008. Use a multimeter to check for continuity between connector X008 pin 12
and chassis ground.
POWER TRAIN - TRANSMISSION Hydrostatic
2 4/7/2006
C.20.F / 88