Operation and Maintenance Manual forWP10 Series Four-valve Diesel Engine (China IV, V)
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andvalve.
◆ EVB butterfly valve is stuck at close state, causing the exhaust to be blocked: Replace the butterfly valve
6.2.3 Engine power is insufficient
Limp home: A running mode of engine under malfunctioned state. The engine malfunction is detected, but the
ECU will not stop the engine immediately. Instead, it will restrain the engine power in such manner that the
engine speed can only be increased to 1,500r/min, so that the driver can drive the vehicle to the nearest service
station for repair.
(1) Fuel injector fault
In general, fuel injector fault includes mechanical fault and wiring fault.
Mechanical fault: needle valve is stuck. The needle valve is seized in the injector due to excessive dirt in the fuel
or water ingress corrosion (Caution: ECU may not report this fault).
Wiring fault: the harness is disconnected or directly contact with the cylinder head and shorted to ground due to
vibration, wearing and other causes. ECU will report this fault.
(2) Water, engine oil and inlet air temperatures are too high
When the temperature of water, engine oil or inlet air is too high, ECU will enable the overheat protection
function to limit the power of diesel engine.
Prior to troubleshooting, first eliminate distortion of response from the sensor and instrument.
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