New Holland CX720 Repair Manual page 1825

E0145-04-Engine RPM sensor Shorted to Low Source (B.10.A.95.80
- G.30.B.53)
CX720, CX740, CX760, CX780, CX820
E0145-04 - Engine RPM sensor Shorted to Low Source
Cause:
The Alternator RPM Sensor (G-01) circuit is shorted to ground. (NH7.5L Mechanical Engines Only)
Possible failure modes:
1. Circuit wiring shorted to ground.
2. Controller internal failure (internal regulator failure).
Solution:
1. Enter InfoView monitor - "Diagnose info" screen.
Select "CCM2" sub menu.
Select "Engine RPM sensor" and check voltage range.
The proper voltage for the Engine RPM sensor circuit is 4.6 volts (no metal) to 6.6 volts (metal).
The proper voltage with the sensor wire disconnected is 7.3 - 9.0 volts.
A. If the voltage reading is low (0 - 0.5 volts), continue with Step 2.
B. If the voltage reading is within proper limits, continue troubleshooting with 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 alternator RPM sensor Terminal R at the
sensor.
A. If the voltage increases to 7.3 - 9.0 volts, the short is in the alternator. Repair the alternator.
B. If voltage remains low on the Infoview monitor, continue with Step 3.
3. The voltage reading on the InfoView monitor is low. Disconnect connector X010.
A. If the voltage increases to 7.3 - 9.0 volts, the short is in the engine (EN) harness between the alternator
and connector X010 pin 9 on wire 421 yellow.
B. If the voltage remains low on the Infoview monitor, the short is in the main frame (MF) harness between
connector X010 pin 9 and connector X016 pin J2-36 wire 421 yellow.
4. Erase the fault code and continue operation.
A.
Series 1206-1347
Wiring harness - Electrical schematic frame 02 (A.30.A.88-C.20.E.02)
POWER PRODUCTION - ENGINE
2 4/7/2006
B.10.A / 279