WP13 Diesel Engine Series Operating Manual
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6.2.3 Insufficient Engine Power
Limp home: a mode of the engine operating with faults. The ECU detects the engine fault, but the
engine will not stop immediately, but the engine power will be limited and the engine speed can
only be increased to 1500 rpm for the driver to drive to the nearest repair station for
troubleshooting.
(1) The fuel injector has fault
The fuel injector has fault, generally including mechanical and wiring faults.
The mechanical faults are as follows: the needle valve is stuck in the fuel injector with no action
due to more filth in the diesel fuel or water corrosion. (Note: The ECU may not report any error!)
The wiring faults are as follows: due to vibration, abrasion and other relevant reasons, if the wire
harness is disconnected or directly lowered on the cylinder head to short to the ground, the ECU
will report an error.
(2) Water, oil or intake temperature is excessively high
When the water, oil or intake temperature is excessively high, the ECU overheating protection
function will act to limit the engine power.
Before troubleshooting, first eliminate the response distortion of sensors and instrumentation.
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Reason and troubleshooting of the high water temperature
①
The water level is too low in the water tank: check whether there is any water leakage, and if
any, add more water.
②
The fan is running too slowly or does not work: check the fan driving components.
Fuel injector wiring terminals
