Here only short data on diagnostics of system of injection by means of a control lamp of "CHECK ENGINE" are provided. In detail diagnostics with use of special devices and diagnostic cards is described in the separate "Repair manual of system of the central injection of fuel".

EBU constantly carries out self-diagnostics on some functions of management. As the EBU language for the indication of a source of malfunction serve diagnostic codes. Codes are two-digit numbers in the range from 12 to 61. At different control units codes of malfunctions can differ a little from each other. Interpretation of codes of malfunctions of an electronic control unit for system of the central injection of fuel with import accessories is presented in tab. 10-2.

Code	Malfunction
12	Serviceability of a diagnostic chain of a control lamp
13	There is no signal from the sensor of concentration of oxygen
14	Low level of a signal of the sensor of temperature of cooling liquid
15	High level of a signal of the sensor of temperature of cooling liquid
21	The overestimated tension of a signal of the sensor of provision of a butterfly valve
22	Insufficient tension of a signal of the sensor of provision of a butterfly valve
23	The overestimated tension of a signal from the air temperature sensor
24	There is no signal from the car speed sensor
25	Insufficient tension of a signal from the air temperature sensor
33	The overestimated tension of a signal from the sensor of absolute pressure of air
34	Insufficient tension of a signal from the sensor of absolute pressure of air
35	Deviation of turns of idling
42	Malfunction of a chain of management of ignition
44	The grown poor composition of mix
45	The enriched composition of mix
51	Error of the programmable read-only memory (PROM)
53	The overestimated system supply voltage
54	The overestimated or insufficient tension of a signal an octane correction
55	Error of an electronic control unit

When malfunction is found by EBU, the code is brought in memory and the control lamp of "CHECK ENGINE" joins. It does not mean that the engine has to be immediately stopped, but the reason of inclusion of a control lamp has to be found at the first opportunity.