New Holland CX720 Repair Manual page 2294

E0153-05-Engine Oil Temperature Line Disconnected (B.60.A.95.92
- G.30.B.50)
CX720, CX740, CX760, CX780, CX820, CX840
E0153-05 - Engine Oil Temperature Line Disconnected
Cause:
The engine oil temperature switch (S-58)[NH 7.5L] 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 "Engine" sub menu.
Select "engine oil temperature" and check voltage range.
The proper voltage range is 0.5 - 4.9 volts.
A. If the voltage reading is high out of range (4.9 - 5.2 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 high (4.9 - 5.2 volts). Disconnect the engine oil temperature
sensor connector X209. Use a jumper wire to short connector X209 pin A to chassis ground.
A. If voltage drops to less than 0.5 volts, the sensor has failed open. Replace the sensor.
B. If the voltage remains high, continue with Step 3.
3. The voltage reading on the InfoView monitor is high (4.9 - 5.2 volts). Disconnect the engine harness from the
main frame harness at connector X010. Use a jumper wire to short connector X010 pin 10 to chassis ground.
A. If voltage drops to less than 0.5 volts, the open is in the engine (EN) harness between connector X010 pin
10 and engine oil temperature switch connector X209 pin A wire 429 yellow. Locate the open and repair.
B. If voltage remains high, the open is in the main frame (MF) harness between connector X010 pin 10 and
connector X016 pin J2-27 wire 429 yellow. Locate the open and repair.
4. Operate the machine while monitoring InfoView monitor.
A. If no high out of range readings are indicated, erase the fault code and continue operation.
POWER PRODUCTION - LUBRICATION SYSTEM
2 4/7/2006
B.60.A / 32