The fuel injection of the injector (usually called the fuel injection end in maintenance) is controlled by the electromagnetic room. After the precise calculation of the fuel injection quantity and the injection time, the fuel is sent into the cylinder, which can make the fuel produce the best combustion under various loads and speeds. After the air temperature, pressure signal and oxygen sensor signal are input to the PCM, the PCM outputs the driving signal to the fuel injector after internal calculation, so as to maintain the air-fuel ratio at the desired value.
The injection end is a small and precise solenoid valve. When the PCM supplies the grounding signal of the fuel injection isolating circuit, the coil of the fuel injection nozzle will be energized, and the energized coil will pull the pins back and let the fuel flow through the nozzle into the combustion chamber. The amount of fuel injected depends on the duration of the injection pulse. The pulse duration is the length of time that the injection interval remains open. The PCM controls the duration of the injection pulse according to the fuel demand of the engine.The injector fault codes are as follows:
DTC: fault description/fault code interpretation
P0261: injector 1 control circuit low voltage
P0262: injector 1 control circuit high voltage
P0264: injector 2 control circuit low voltage
P0265: injector 2 control circuit high voltage
P0267: injector 3 control circuit low voltage
P0268: injector 3 control circuit high voltage
P0270: injector 4 control circuit low voltage
P0271: injector 4 control circuit high voltage
P0273: injector 5 control circuit low voltage
P0274: injector 5 control circuit high voltage
P0276: injector 6 control circuit low voltage
P0277: injector 6 control circuit high voltage
P0201: injector 1 control circuit (open circuit)
P0202: injector 2 control circuit (open circuit)
P0203: injector 3 control circuit (open circuit)
P0204: injector 4 control circuit (open circuit)
P0205: injector 5 control circuit (open circuit)
P0206: injector 6 control circuit (open circuit)
1. Analysis of Fault Code P0261
Fault description: injector 1 control circuit low voltage Possible causes of failure.
a. The fuse of the fuel injection nozzle is damaged.
b. Fuel injection ends circuit open circuit. Injector failure.
Fault generation principle:
The PCM activates the corresponding injector pulses for each cylinder. The fuel injector supply voltage is provided by the required battery. The control module ground the control circuit through the solid-state device of the driver to control each injector, and the control module monitors the status of each driver. If the control module detects that the voltage corresponding to the driver command status is incorrect, an injector control circuit DTC sets.
Fault identification conditions:
The ECM detects a short to ground in the injector high voltage control circuit for more than 2S.
When the fuel pump relay operates normally, the system fuel pressure is maintained at 300-350KPA, and the system power supply voltage is between 11-16v, if the injector driving transistor in PCM feels that the actual voltage value and the timing of the injector actuation do not meet the set standard value, the fault code p0261 will be set.
2. Analysis of Fault Code P0262
Fault description: injector 1 control circuit high voltage.
Possible causes of failure:
① The fuse of the fuel injection nozzle is damaged.
② The harness connector of the fuel injector is poor.
③ The injector circuit is shorted to ground.
④ Injector failure.
Fault generation principle:
The PCM activates the corresponding injector pulses for each cylinder. The power supply voltage of the injector is provided by the battery. The control module grounds the control circuit through the driver's solid-state device to control each injector. The control module monitors the status of each driver. If the control module detects that the voltage corresponding to the driver command status is incorrect, an injector control circuit DTC sets.
Fault identification conditions:
The ECM detects a short to voltage in the injector high voltage control circuit for more than 2S.
When the fuel pump relay operates normally, the system fuel pressure is maintained at 300-350kpa, and the system power supply voltage is between 11-16v if the injection order in PCM drives the quality control system, and it is detected that the actual voltage value and the timing of the injection nozzle actuation do not meet the set standard value, the fault code P0262 is set.
3. Analysis of Fault Code P0201
Fault description:
injector 1 control circuit open circuit, this diagnosis monitors the electrical control of the fuel injection end.
Cause of failure :
① The electric wire harness between the engine control unit and fuel injector 1 is damaged.
② Injector 1 is damaged.
Principle of fault generation:
If the injector voltage is more than 210v and the charge on the injector is less than 300uA. S, the fault is identified and the fault code P0201 is set.
Fault identification conditions:
① Under voltage condition: the vehicle network voltage is more than 10V.
Under the condition of temperature: the coolant temperature is more than - 20 ℃.
② Time condition: none.
③ Other conditions engine running.
Fault storage condition and display record fault immediately.
Troubleshooting measures:
① Check electric wire harness between PCM and fuel injector 1.
② Check the injector 1 and measure the resistance [standard value (200 ± 10) k Ω] between the pins of the injector. If the standard value is not reached, replace the injector.
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