Operation and Maintenance Manual forWP10 Series Four-valve Diesel Engine (China IV, V)
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◆ Troubleshooting: Inspect and repair the wiring, and determine if the fault occurs to the flow metering unit or
common rail pressure sensor, and inform the office for troubleshooting.
(5) Abnormal fluctuation of common rail pressure due to leakage in fuel line
In the vehicle running, the speed will appear unstable.
◆ Troubleshooting:
First, cut off the power for one minute and then restart. If the fault still exists, check and repair the sealing of the
fuel line.
(6) Sensor fault
ECU will estimate the inlet air volume through the intake pressure sensor (mounted on the intake manifold), and
heat load of the engine is estimated with water temperature sensor (mounted on water pump), and the fuel
pressure in the common rail is tested with the rail pressure sensor (mounted on the common rail pipe).
◆ Troubleshooting
Check the intake temperature and pressure sensors, water temperature sensor and rail pressure sensor, and ensure
that the connectors are connected firmly.
Caution: In event of fault 1, 3, 4, 5 or 6, the diesel engine will enter the “Limp Home” mode.
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