WP13 Diesel Engine Series Operating Manual
29
③
The water tank is blocked: check the water tank and clean or repair it.
④
The water pump belt is loose: adjust the tension as provided
⑤
The water pump has its gaskets and impellers damaged or worn: check and repair or replace
the faulty parts.
⑥
Thermostat fault: replace it.
⑦
The water pipe has its sealing elements damaged with air invasion: check the water pipe, joints
and gaskets, and replace the damaged parts.
◆
Reason and troubleshooting of excessively high oil temperature
①
The oil sump has insufficient oil or a low oil level: check the oil level and leakage. Repair it
and add more oil.
②
High water temperature: troubleshoot it immediately.
③
The oil cooler cannot work smoothly: check and clean it.
◆
Reason and troubleshooting of excessively high intake temperature
Check the cooling capacity of the intercooler
(3) Synchronization signal error
If this error appears, one sensor generally has its signal invalid.
Read out the flash code by means of the flash code indicator and refer to the table for flash codes to
find out the specific reasons, with the troubleshooting measures identical to 9.2.1-4.
(4) Flow measurement unit fault
The flow measurement unit installed on the high-pressure fuel pump is an actuator to control the rail
pressure, and after it goes wrong, the high-pressure fuel pump will feed the common rail pipe at its
greatest capacity. At this moment, the relief valve on the common rail pipe will generally be open
and the engine will be “clicking”. Similar phenomenon will also appear when the rail pressure
sensor has fault.
◆
Troubleshooting: overhaul the circuits to confirm that the flow measurement unit or the rail
pressure sensor has failed, and notify the Office for further treatment.
(5) The rail pressure fluctuates abnormally due to leakage of the fuel pipeline
During running, the vehicle speed may become instable and the vehicle may be stampeding forward
occasionally.
◆
Troubleshooting
Flow metering unit
