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Sensing system Temperature sensor - Open circuit (C.20.F.95.90 -
G.30.B.50)
AFX8010
E0023-05 - Hydrostat Motor Temperature Sensor
Cause:
The hydrostat motor temperature sensor B-46 is disconnected, or the circuit is open.
Possible failure modes:
1.
Sensor failed open.
2.
Sensor circuit wiring is open.
3.
Controller internal failure.
Solution:
1.
Enter the Universal Display Plus "DIAG" screen. Select the "GROUND DRIVE" sort menu, and select "MTR
TEMP SEN" to check the voltage range. The normal operating voltage range is 0.5 - 4.9 volts.
A.
If the voltage reading is 4.9 - 5.2 volts, continue with Step 2.
B.
If the voltage reading is within the proper limits, continue with Step 6.
2.
The voltage reading is 4.9 - 5.2 volts. Disconnect the hydrostat motor temperature sensor connector X091,
and install a jumper wire between pins A and B.
A.
If the voltage drops to 0 - 0.5 volts, the open circuit is in the sensor, or sensor wiring. Replace the sensor.
B.
If the voltage reading remains at 4.9 - 5.2 volts, continue with Step 3.
3.
The voltage reading is 4.9 - 5.2 volts. Remove the jumper wire from connector X091. Use a multimeter to
check for continuity between connector X091 pin A and chassis ground.
A.
If no continuity is found, continue with Step 4.
B.
If continuity is found, continue with Step 5.
4.
The voltage reading is 4.9 - 5.2 volts. Disconnect the lower frame (LF) harness from the front frame (FF)
harness at connector X023. Use a multimeter to check for continuity between connector X023 pin 16 and
chassis ground.
A.
If no continuity is found, there is an open circuit in the front frame (FF) harness between connector X023
and connector X020 J3-18 wires 723 or 501 blue. Locate the open and repair.
B.
If continuity is found, there is an open circuit in the lower frame (LF) harness between connector X023
and connector X091 wires 723 or 774 blue. Locate the open and repair.
5.
The voltage reading is 4.9 - 5.2 volts. Disconnect the lower frame (LF) harness from the front frame (FF)
harness at connector X023. Install a jumper wire between pins 26 and 16 on connector X023.
A.
If the voltage drops to 0 - 0.5 volts, the open circuit is in the lower frame (LF) harness between connector
X023 and connector X091 wire 773 yellow. Locate the open and repair.
B.
If the voltage remains at 4.9 - 5.2 volts, the open circuit is in the front frame (FF) harness between
connector X023 and connector X020 J3-33 wire 773 yellow. Locate the open and repair.
6.
Visually inspect the harness and connectors for damage, bent or dislocated pins, corroded terminals or
broken wires.
A.
If no damage is found, erase fault code and continue operation.
POWER TRAIN - TRANSMISSION Hydrostatic
9681 1 27/05/2004
C.20.F / 48
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