New Holland WorkMaster 50 Service Manual page 751

DTC 136-03-Fuel rail pressure sensor voltage is higher than
expected
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 a voltage
greater than 4.90 V in the rail pressure sensor B-9004 signal circuit, this fault will occur.
Cause:
The ECU A-9000 has detected a voltage greater than 4.90 V in the rail pressure sensor B-9004 signal circuit.
Possible failure modes:
1. Faulty rail pressure sensor B-9004 wiring, short to a voltage source.
2. Faulty rail pressure sensor B-9004 wiring, open circuit.
3. Faulty rail pressure sensor B-9004, internal failure.
4. 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 6.
2. Check the rail pressure sensor B-9004 wiring for a short circuit condition.
Disconnect the engine harness (EN) from the rail pressure sensor B-9004 at connector X-9026.
With the key in the OFF position, use a multimeter to perform the following voltage check on the engine harness
(EN) side :
From
X-9026 pin 2
With the key in the ON position, use a multimeter to perform the following voltage check on the engine harness
(EN) side :
From
X-9026 pin 2
A. If the specified values are not measured, there is a short to battery or switched battery in the rail pressure
sensor B-9004 wiring in the engine harness (EN). Locate and repair the broken conductor.
B. If the specified values are measured, leave connector X-9026 disconnected and continue to Step 3.
3. Check the rail pressure sensor B-9004 engine harness (VE) wiring for an open circuit.
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 on the engine harness
(EN) side :
Electrical systems - FAULT CODES
To
Chassis ground
To
Chassis ground
47866583_ 02/12/2015
55.12 [55.DTC] / 30
Value
There should be no voltage.
Value
There should be less than 5.5 V