New Holland CX720 Repair Manual page 2434

E0131-03-Trans Shift Gear 1 sens Shorted To High Source
(C.20.B.95.81 - G.30.B.54)
E0131-03 - Trans Shift Gear 1 sens Shorted To High Source
Cause:
The transmission shift position 1 sensor (B-37) circuit is shorted to 12 volts.
Possible failure modes:
1. Sensor supply wiring shorted to 12 volts.
2. Controller internal failure (internal regulator failure).
Solution:
1. Enter the InfoView monitor - "Diagnose info" screen.
Select "Driveline" sub menu.
Select "Transmission shift position 1 in and check voltage range.
The proper voltage when in shift position 1-5.6 - 7.3 volts
The proper voltage when not in shift position 1-0.5 - 5.6 volts
A. If the voltage reading is high out of range continue with Step 2.
B. If the voltage reading is within the proper limits, since the shorted wire may not be powered up at this time.
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 high. Disconnect the transmission shift position sensor connector
X093 at the transmission.
A. If the voltage drops to 7.3 - 9.0 volts the short is in the sensor, or sensor wiring. Replace the sensor. To
temporarily bypass that speed see Step 5.
B. If the voltage remains high on Infoview monitor continue with Step 3.
3. The voltage reading on the InfoView monitor is high. Disconnect the lower frame harness from the front frame
harness at connector X023.
A. If the voltage drops to 7.3 - 9.0 volts the short is in the lower frame harness between connector X023 pin
8 and connector X093 pin 2 wire 405 yellow.
B. If the voltage remains high on InfoView monitor the short circuit is somewhere between connector X023
pin 8 and connector X017 pin J3-36 on CCM2 in the front frame harness wire 405 yellow.
4. Operate the transmission shift gear lever and monitor the InfoView monitor voltage readings.
A. If high voltage reading is now viewed continue with Step 2.
B. If a high voltage reading cannot be generated erase the fault code and continue operation.
5. To bypass a bad sensor create a short circuit between the bad sensor wire and common ground (pin 6) in
connector X093. The system will generate a fault code for "shorted to low source" and the operator can continue
without that gear.
A.
POWER TRAIN - TRANSMISSION Mechanical
2 4/7/2006
C.20.B / 96