Self-diagnosis circuit diagram of the engine control system of Santana 2000GLi sedan

1.V. A. The G1551 fault diagnostic instrument can not only diagnose faults on the EFI engines of Hongqi, Jetta, Golf, and Passat sedans, but can also detect faults on the EFI engines of Santana sedans. When using this instrument, the car should meet the following conditions:

The engine being tested has been running for a sufficient period of time so that the coolant temperature is higher than 7°C, the battery voltage is normal, the fuses are normal, and the engine grounding wire is normal.

(1) Open the fault diagnosis socket cover located on the lower side of the gear selector lever, and remove the V. A. The G1551 diagnostic instrument is connected to the diagnostic socket with a cable (Figure 1). The cable code is V. A. G1551/3.

l - steering wheel; 2 - VACl551 fault diagnostic instrument; 3 - diagnostic instrument power plug; 4 - engine fault diagnosis socket;
5 - gear lever; 6 - cigarette lighter and ashtray; 7 - air conditioning control panel
to turn on the ignition switch or start the engine To read the fault code, follow V. A. G1551 diagnostic tool display instructions to operate the diagnostic tool. If the engine cannot be started due to a malfunction, the ignition switch should still be switched on so that all signals can be found.

(2) Press the → key, enter the address command 01 code indicating the engine electronic control system, and confirm with the Q key, the display will show:

30090731lAMOTRONICMl·5·4·P1303
Among them, the part number of 300907311A engine controller (see the accessories catalog for the actual controller number);

MOTRONIC fuel injection system;

Hardware code (manufacturing number) of the Ml.5.4P controller;

The software code name of the 1303 controller.

The number and code of the controller can only be displayed when the ignition switch is turned on or the engine is running.

(3) Press the → key, the screen will display "Fast data transmission, help function selection", that is:

SChneUeUatenUbertragUllgHELP

FUnktlOnanWahlenXX

With the advancement of science and technology, corresponding to different batches of automobile products, the software of VAGI551 diagnostic instrument will be upgraded accordingly. Not only the narrative text will change, but also the various data tables will be different.

V. A. The G1551 diagnostic instrument has the following functions (see Table 1)


Note: The measurement values ​​displayed in 08 and the measurement data sets used are explained in the relevant maintenance steps; other measurement data sets and measurement values ​​output by the controller are not included in the user service. use.

(4) Press the "print" key and turn on the printer (the indicator light on the key lights up). The screen displays: "Fast data transmission, select xx for help function". At this time, enter the function code "02" (read the fault code). Press the Q key to confirm. If "x faults are recognized!" is displayed, that is: XFehlerdrkannt!, the stored fault codes will be displayed in order and printed out. If "No fault is identified" is displayed, press the → key, then enter the 06 code (end output), and press the Q key to confirm, turn off the ignition switch, and continue to search for relevant parts according to the fault.