New Holland WorkMaster 50 Service Manual page 753

DTC 136-04-Fuel rail pressure sensor voltage is lower 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
less than 342.20 mV in the rail pressure sensor B-9004 signal circuit, this fault will occur.
Cause:
The ECU A-9000 has detected a voltage less than 342.20 mV in the rail pressure sensor B-9004 signal circuit.
Possible failure modes:
1. Faulty rail pressure sensor B-9004 wiring, short to ground condition.
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 5.
2. Check the rail pressure sensor B-9004 engine harness (EN) wiring for a short 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 on the engine harness
(EN) side :
From
X-9026 pin 2
X-9026 pin 2
A. If there is continuity, there is a short to ground in the rail pressure sensor B-9004 engine harness (EN) wiring.
Locate and repair the shorted conductor.
B. If there is no continuity, leave connectors X-9026 and X-9001 disconnected and continue to Step 3.
3. Check the rail pressure sensor B-9004 vehicle harness (VE) wiring for a short to ground condition.
With the key in the OFF position, use a multimeter to perform the following continuity check on the engine harness
(EN) side :
From
X-9001 pin A41
A. If there is continuity, there is a short circuit in the rail pressure sensor B-9004 engine harness (EN) wiring.
Locate and repair the broken conductor.
B. If there is no continuity, leave connector X-9026 and continue to Step 4.
Electrical systems - FAULT CODES
To
X-9026 pin 1
Chassis ground
To
All pins in connector X-9001
47866583_ 02/12/2015
55.12 [55.DTC] / 32
Value
There should be no continuity.
There should be no continuity.
Value
There should be no continuity.