New Holland CX720 Repair Manual page 2560

E0135-03-Charge Pressure Switch Shorted To High Source
(C.20.F.95.86 - G.30.B.54)
E0135-03 - Charge Pressure Switch Shorted To High Source
Cause:
The charge pressure switch (S-37) circuit is shorted to 12 volts.
Possible failure modes:
1. Switch 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 "Charge pressure switch" and check voltage range.
The proper voltage range for the charge pressure switch (engine not running) is 0 - 1.8 volts.
The proper voltage range for the charge pressure switch (engine running) is - 1.8 - 10.0 volts.
A. If the voltage reading is high out of range (>10 volts), 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 charge pressure switch connector X101.
A. If the voltage drops back into the proper range the short is in the switch. Replace the switch.
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 gearbox harness from the main frame
harness at connector X011.
A. If the voltage drops back into the proper range the short is in the gearbox harness between connector
X011 pin W and connector X101 wire 684 yellow. Locate and repair.
B. If the voltage remains high on Infoview monitor the short circuit is somewhere between connector X011
pin W and connector X016 pin J2-35 on CCM2 in the main frame harness wire 684 yellow. Locate and
repair.
4. Operate the machine while monitoring InfoView display. If no high out of range readings are indicated, erase
the fault code and continue operation.
A.
Series 1206-1281
Wiring harness - Electrical schematic frame 07 (A.30.A.88-C.20.E.07)
Series 1282-1347
Wiring harness - Electrical schematic frame 08 (A.30.A.88-C.20.E.08)
Series 1348 and above
Wiring harness - Electrical schematic frame 09 (A.30.A.88-C.20.E.09)
POWER TRAIN - TRANSMISSION Hydrostatic
2 4/7/2006
C.20.F / 108