New Holland CX720 Repair Manual page 2423

E0128-04-Trans Shift Gear N sens Shorted To Low Source
(C.20.B.95.81 - G.30.B.53)
E0128-04 - Trans Shift Gear N sens Shorted To Low Source
Cause:
The transmission shift position N sensor (B-37) circuit is shorted to ground.
Possible failure modes:
1. Sensor supply wiring shorted to ground.
2. Controller internal failure (internal regulator failure).
Solution:
1. Enter the InfoView Monitor - "Diagnose info".
Select "Driveline" sub menu.
Select "Trans shift gear N sens" and check voltage range.
The proper voltage when in shift position N - 5.6 - 7.3 volts
The proper voltage when not in shift position N - 0.5 - 5.6 volts
A. If the voltage reading is low 0 - 0.5 volts continue with Step 2.
B. If the voltage reading is within the proper limits. Continue the troubleshooting at step 4.
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. The voltage reading on the InfoView monitor is low. Disconnect the transmission shift position sensor connector
X093 at the transmission.
A. If the voltage increases to 7.3 - 9.0 volts the short is in the sensor, or sensor wiring. Replace the sensor.
B. If the voltage remains low on InfoView monitor continue with Step 3.
3. The voltage reading on the Infoview monitor is low. Disconnect the lower frame harness from the front frame
harness at connector X023.
A. If the voltage increases to 7.3 - 9.0 volts the short is in the lower frame harness between connector X023
pin 10 and connector X093 pin 1 wire 407 yellow.
B. If the voltage remains low on InfoView monitor the short circuit is somewhere between connector X023
pin 10 and connector X017 pin J3-28 on CCM2 in the front frame harness wire 407 yellow.
4. Operate the transmission shift gear lever and monitor the InfoView monitor voltage readings.
A. If low voltage reading is now viewed continue with Step 2.
B. If a low voltage reading cannot be generated erase the fault code and continue operation.
POWER TRAIN - TRANSMISSION Mechanical
2 4/7/2006
C.20.B / 85