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2.7.7.13. Conditions of storing of codes of malfunctions

EBU brings in memory of P0121 and includes a control lamp of malfunction of a control system of the engine in case of a mismatch between an engine loading signal from the sensor of provision of a butterfly valve and a signal from the sensor of absolute pressure. This code shows that information on the provision of a butterfly valve and a consumption of air issued on EBU from the sensor of provision of a butterfly valve and the sensor of absolute pressure does not correspond to the actual loading of the engine.
EBU brings the P0122 code in memory and includes a control lamp of malfunction of a control system of the engine if the angle of opening of a butterfly valve during more than 0,2 with less than 2,1 ° in two cycles of driving. This code indicates that the sensor of provision of a butterfly valve or EBU define unusually small angle of opening of a butterfly valve. EBU brings the P0123 code in memory and includes a control lamp of malfunction of a control system of the engine if the angle of opening of a butterfly valve during 0,2 with more than 105,4 ° in two cycles of driving. This code indicates that the sensor of provision of a butterfly valve or EBU define unusually big angle of opening of a butterfly valve.

NOTE
The nominal rate of resistance at measurement on conclusions 1 and 3 sensors of provision of a butterfly valve is in limits of 1600-2500 Ohms.

Check
Separate the electric socket of the sensor of provision of a butterfly valve.

Fig. 2.246. The scheme of connections when checking the sensor of provision of a butterfly valve


Check resistance on conclusions 2 ("mass" of the sensor) and 3 (power supply of the sensor) the electric socket of the sensor (fig. 2.246).
Nominal rate of resistance: 0,7–3,0 kOhm
Attach an analog ohmmeter to conclusions 2 ("mass" of the sensor) and 1 (a sensor signal) the electric socket of the sensor.
Slowly moving a butterfly valve from the provision of idling to the provision of full opening, you watch smoothness of change of resistance in proportion to the angle of opening of the gate.
At resistance deviation from norm or its not smooth change replace the sensor of provision of a butterfly valve.
Moment of an inhaling of the sensor of provision of a butterfly valve: 1,5–2,5 N · m.