New Holland Workmaster 50, Service Manual

Page: 943 / 1067

Electrical systems - FAULT CODES
DTC 435-12-Rail pressure sensor value is intermittent
Control Module : ECU
NOTE: If the rail pressure sensor B-9004 is replaced, it is necessary to perform the Replacement of the Rail Pressure
sensor - Reset ECU Data with the Electronic Service Tool (EST) before you return the machine to service. See
Common rail pressure sensor - Configure - Reset ECU data (Rail pressure sensor) (55.010) , if necessary.
Context:
The Engine Control Unit (ECU) A-9000 monitors the rail pressure sensor B-9004 If the ECU A-9000 detects more than
5 pressure jumps of greater than
500 bar ( 7250 psi ) and the time between the pressure jumps is less than 3.00 s , an
intermittent connection is assumed and this fault will occur.
Cause:
The ECU A-9000 has detected an intermittent connection in the rail pressure sensor B-9004 signal circuit.
Possible failure modes:
1. Faulty rail pressure sensor B-9004 wiring, intermittent electrical connection.
2. Faulty rail pressure sensor B-9004, internal failure.
3. Faulty ECU A-9000, software.
Solution:
1. Verify fault is present and active.
Use the Electronic Service Tool (EST) to check the status of this fault.
A. If the fault is present and active, continue with Step 2 .
B. If the fault is no longer present or in an inactive state, the fault may be intermittent and not currently active.
Continue with Step 4 .
2. Check the rail pressure sensor B-9004 engine harness (EN) harness wiring for an open circuit or intermittent open
circuit condition.
Disconnect the engine harness (EN) from the rail pressure sensor B-9004 at connector X-9026 .
Disconnect the engine harness (EN) from the ECU A-9000 at connector X-9001 .
With the key in the OFF position, use a multimeter to perform the following continuity check for an open circuit on
the engine harness (EN) side :
From To Value
X-9026 pin 2 X-9001 pin A41 There should be continuity.
NOTE: Wiggle the harness during the check to promote an intermittent electrical connection.
A. If there is no continuity, there is an open circuit in the rail pressure sensor B-9004 wiring in the engine harness
(EN). Locate and repair the broken conductor.
B. If there is continuity, leave connector X-9026 disconnected and continue to Step 3 .
3. Replace the rail pressure sensor B-9004.
Use the Electronic Service Tool (EST) to check the status of this fault.
A. If the fault is no longer active, return the machine to service.
B. If the fault is still active, check the ECU A-9000 for the appropriate software and re-flash, if necessary.
4. Visually inspect the relevant harnesses and connectors for damage, bent or dislocated pins, corroded terminals,
or broken wires. Verify that the connectors are fully installed. Flex the harnesses involved to reveal intermittent
breaks or shorts in the wiring concerned. Operate the machine while you monitor the display.
47866583_ 02/12/2015
55.12 [55.DTC] / 222