TICS injection pump electronic control system, the ECU (engine control unit) has a self-diagnostic function, detection and control of various parts of the system working conditions. "CHECKENGINE" (check the engine immediately when the ECU detected a fault signal from the sensors and actuators, also known as fault diagnostic lights) warning lamp is lit, while the failure information in the form of fault codes stored in memory. The following focuses on how to use the fault code diagnostics and troubleshooting.
A. Retrieval of diagnostic trouble codes (DTC)
Obtain fault code diagnosis of electronic control system failure, overhaul of modern construction machinery is very important. Usually adjust the switch to self-diagnosis switch (failure) from 'CHECKENGINE warning lights flashing read fault codes. Fault codes for the transfer of as follows:
(1) Check the memory connector is closed.
(2) close the start switch, then open, but do not start the engine.
(3) attached storage tone switch. Memory tone switch to the blue connector of the lower left side of the dashboard,
(4) dashboard "CHECK ENGINE" fault lights flashing, the fault code is displayed in accordance with the order of faults.
Two. Read diagnostic trouble codes
Three different flashing numbers indicate the three-digit code, the two different sparkling figures started from the two-digit code. Can use the shiny code word to identify diagnostic trouble codes, when multiple diagnostic trouble codes, a diagnostic fault code is repeated three times, go to the next diagnostic trouble codes. 6HK1-TC engine diagnostic trouble codes in the Schedule.
Schedule backup control TICS injection pump electronic control system provides the security of insurance or "home" function, when the ECU detects a sensor or circuit failure, according to the ECU to the original set of programs and data to control the engine to enter the mandatory operation of state or downtime.
3. Clear diagnostic trouble codes
The tips of the fault code troubleshooting, CHECKENGINE "warning light has been extinguished, but the fault information is still stored in the ECU memory, can not be automatically eliminated with the troubleshooting. Therefore, troubleshooting, should also be stored in the memory fault code cleared, so as not to mix with the new failure to bring difficulties to the next overhaul. Clear the fault code of procedure is as follows:
(1) Check the memory connector is closed.
(2) close the start switch, then open.
(3) Connect memory clear switch 1s. Memory clear white connector of the switch to the lower left side of the dashboard,
(4) to disconnect the memory connector, disconnected to clear the memory of 0.5 s.
(5) close the start switch is open, check the diagnostic trouble codes clear. If it persists, repeat the above steps (1) to (4).
4. Use and maintenance of Note
(1) jumper to start other vehicles or other vehicles across the machine, you should disconnect the ignition switch, removable jumper.
(2) Overhaul the fuel injection pump installed after the air drained out before they start, or easily burn to pre-stroke actuator.
(3) move the pump, you can not carry the wiring harness or electrical components to prevent damage.
Do not open the computer cover (4) repair can not repair the computer, even if bad, to open and is likely to damage the computer.
(5) is strictly prohibited in the engine at high speed, disconnect the battery from the circuit to prevent transient over-voltage damage to the computer and sensors.
(6) When the engine control system failure, the "check engine" warning light (CHECKENGINE) lit at the same time, the ECU fault information stored in memory, it is not the battery is disconnected from the circuit to prevent the fault codes stored in the computer and related data and information is cleared. Only through the fault self-diagnostic system fault codes and related information, tune and diagnose the cause of the failure, before they are allowed to disconnect the battery from the circuit.
5 Fault diagnosis case
(1) the engine can not start
Check: the transfer of the fault codes to check out the 6 fault code are 01,571,423,543,29,292, clear code after the tone code got left two fault codes (01 and 292). 01 normal, pre-trip learning function 292 error. Testing, the six terminals of the pre-stroke actuator socket (6-pin gray) normal resistance value, the implementation of the pre-trip device static, but the high pressure oil pipe oil spray.
Analysis: The high pressure oil pipe oil spray there are two possibilities: First, the ECU control electronic governor in the state cut off the fuel; rack card to stop the oil (turn off) position.
Exclude the disintegration of the TICS injection pump, and found the broken the Ⅳ cylinder-chip timing and timing rod pin timing lever mechanical card died in the location of the stop oil. After processing repair and then adjust the fuel injection pump, the fault has disappeared.
(2) engine can not start
Check: the transfer of the fault code to check out the fault code, 01,10,423,543,292, clear code and then the modem got left two enemy impaired yards (01 and 10). 01, 10 rack position sensor error. The normal resistance value by the three terminals of the detection rack position sensor socket (3 pin white), but measurement of the ECU connector terminals and the output voltage is 3 V (normal 4.75 ~ 5.25V), and the high pressure oil pipe oil spray.
Analysis: ECU connector terminals of the output voltage is abnormal, high pressure oil pipe oil spray, the ECU has been bad, the electronic governor is the state cut off the fuel.
Exclusion: the replacement of the ECU, the fault has disappeared, the engine is working properly.
Note: The electronic control system malfunction, most system components, wiring, connectors and sensors, the ECU itself rarely fails.
(3) the engine can not start
Check: the transfer of the fault code check out the three fault codes are 01,14 and 15,01 for the normal fault codes 14 and 15 may indicate that the main speed sensor and Vice-speed sensor error. Check the main speed sensor and vice speed sensor, a lot of oil pollution.
Analysis: heavily oiled after the main speed sensor and vice speed sensor pulses issued by the ECU control electronic governor is cut off the fuel state.
Exclusion: wipe and clean up the speed sensor and vice speed sensor fault has disappeared.
(4) about the engine up to 2 000 r / min. Can not further increase the speed, operation of weakness and slow movement, a lot of black smoke
Check: the transfer of the fault codes to check out the two fault codes are 01 and 292 001, 292 for the pre-trip learning function error. Circuit detection, 6 pre-stroke actuator socket terminal resistance value is abnormal, indicating that pre-stroke actuator damage.
Analysis: If the pre-stroke actuator damage. Injection rate and injection advance angle will use the standby mode control only to maintain the engine is running, but it does not achieve the best performance.
Excluded: the replacement of the pre-actuators, engine power is restored, normal engineering and mechanical action.
(5) the engine is running, weakness, a large number of black smoke
Check: the transfer of the fault codes to check out the five fault codes are 01,29,291,423 and 292. 01 normal: 29 pre-trip wait service system error; 291 pre-travel sensor error; 423 for the pre-stroke power fuse; 292 for pre-trip learning function error. Shows that the failure and to pre-stroke through the circuit detects 6 pre-stroke actuator socket terminals are short-circuit, indicating that pre-stroke actuator is damaged.
Analysis: The pre-stroke actuator short circuit is often the fuel exhaustion or refitted exhaust air injection pump, pre-stroke actuator overheating caused.
Excluded: the replacement of the pre-actuators, and troubleshooting.
(6) Sometimes the engine turn off their own
Check: the transfer of the fault code check out the three fault codes are 01,33 and 292 of the 01 normal; 33 for the error of random access memory circuit; 292 pre-trip learning function error. Circuit detection, 6 pre-stroke actuator socket terminal resistance values were normal, static pre-stroke actuator is good.
Analysis: The normal pre-stroke actuator static, does not guarantee that the dynamic (state) under normal. Work to be controlled by the ECU, if the ECU error pre-stroke control chaos will appear randomly turn off phenomenon in the case of engine load.
Exclude: to replace the ECU, the engine is working properly.
(7) the engine is running weak, a lot of white smoke
Check: the transfer of the fault code query engine fault code is stored.
Analysis: If no fault codes stored, the engine weakness, white smoke, then the concentration of the mixture and ignition timing have a problem, often by the engine control unit
Fuse caused.
Excluding replacement of the engine control unit insurance, ie, normal engine operation. |
