New Holland CX720 Repair Manual page 2428

E0129-05-Trans Shift Gear 3 sens Line Disconnected (C.20.B.95.81 -
G.30.B.50)
E0129-05 - Trans Shift Gear 3 sens Line Disconnected
Cause:
The transmission shift position 3 sensor (B-37) circuit is open.
Possible failure modes:
1. Sensor supply or ground wiring is open.
2. Controller internal failure (internal regulator failure).
Solution:
1. Enter the InfoView monitor - "Diagnose info" screen.
Select "Driveline" sub menu.
Select "Trans shift gear 3 sens" and check voltage range.
The proper voltage when in shift position 3-5.6 - 7.3 volts
The proper voltage when not in shift position 3-0.5 - 5.6 volts
A. If the voltage reading is 7.3 - 9.0 volts continue with Step 2.
B. If the voltage reading is within the proper limits. Continue the troubleshooting at step 6.
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 7.3 - 9.0 volts. Disconnect the transmission shift position sensor
connector X093 at the transmission. Use a jumper wire to short connector X093 pin 4 to chassis ground.
A. If the InfoView monitor drops to 0 - 0.5 volts indicating a ground, the open circuit is not in the supply side
of the circuit. Continue with step 4.
B. If the InfoView monitor still displays 7.3 - 9.0 volts continue with Step 3.
3. The voltage reading on the InfoView monitor is 7.3 - 9.0 volts. Disconnect the lower frame harness from the
front frame harness at connector X023. Use a jumper wire to short connector X023 pin 11 to chassis ground.
A. If the InfoView monitor drops to 0 - 0.5 volts indicating a ground, the open circuit is in the lower frame (LF)
harness between connector X023 pin 11 and connector X093 pin 4 wire 408 yellow. Locate the open and
repair.
B. If the InfoView monitor still displays 7.3 - 9.0 volts, the open is in the front frame (FF) harness between
connector X023 pin 11 and CCM2 connector X017 pin J3-38 wire 408 yellow. Locate the open and repair.
4. Disconnect the transmission shift position sensor connector X093. Use a multimeter to check for continuity
between the harness end of connector X093 pin 6 and chassis ground.
A. If there is continuity, the ground path for the sensor is complete, and the fault is in the sensor itself. Replace
the sensor.
B. If there is no continuity to ground, the ground path for the sensor is open. Continue with step 5.
5. Disconnect the lower frame harness from the front frame harness at connector X023. Use a multimeter to check
for continuity between the harness end of connector X023 pin 5 and chassis ground.
A. If there is continuity, the open circuit is in the lower frame (LF) harness between connector X023 pin 5 and
connector X093 pin 6 wire 426 blue or 042 blue. Locate the open and repair.
B. If there is no continuity to ground, the open is in the front frame (FF) harness between connector X023 pin
5 and CCM2 connector X017 pin J3-18 wire 042 blue or 766 blue. Locate the open and repair.
POWER TRAIN - TRANSMISSION Mechanical
2 4/7/2006
C.20.B / 90