Attention. When diagnosing, two main modes are used: current self-diagnosis and testing.
Current self-diagnosis mode
To obtain an output diagnostic code, perform the following procedures.
1. Check the initial conditions.
A) The battery voltage is at least 11 volts.
b) Throttle valve - fully closed (conclusions "IDL" throttle position sensor - shorted).
V) The gear lever is in the neutral position.
G) All additional equipment is turned off,
d) The engine is warmed up to normal operating temperature.
2. Turn on the ignition, but do not start the engine.
3. Short-circuit the diagnostic connector pins "TE1" And "E1".
4. Read the diagnostic code by number of flashes, display "CHECK". (See the table below for diagnostic codes).
Form of diagnostic codes
A) Normal system operation (no fault). The light panel lights up and goes out 2 times per second.
b) Fault code display. If there is a malfunction, the light panel flashes every 0.5 seconds. The first sequence of flashes corresponds to the first number of the two-digit diagnostic code. After a pause of 1.5 seconds, a second sequence of flashes is displayed, corresponding to the second number of the code. If there are two or more fault codes, an interval of 2.5 seconds is set between them when outputting. After all codes are displayed, there is a pause of 4.5 seconds, and then they all repeat until the conclusions "TE1" And "E1" diagnostic connector are shorted.
Attention: in the case of several fault codes, their indication starts with a smaller code and continues in ascending order.
V) Two-stage algorithm for fault detection.
1 - fixing a malfunction for the first time (preliminary recording in memory),
2 - fixing the fault for the second time (illuminated display board),
3 - ignition off,
4 - second cycle,
5 - first cycle,
6 - ignition on.
When writing some codes, a two-stage algorithm is used. It lies in the fact that when a malfunction occurs for the first time, its code is temporarily stored in the memory of the electronic control unit. If the same malfunction is fixed during the second test driving test, then in this case the light panel lights up. The second driving test is repeated in the same mode. (However, the ignition must be switched off between the first and second test drive cycles). During self-diagnosis in test mode, the light panel turns on at the first manifestation of a malfunction.
5. Upon termination of diagnosing, disconnect a wire from a diagnostic socket.
Test Mode
Attention: Compared with the normal self-diagnosis mode, the self-diagnosis in test mode is more sensitive to fault detection.
This allows you to determine the malfunctions in the electrical circuits of the starting system, the air conditioning system, as well as in the electrical circuit of the start inhibit switch.
Self-diagnostics in the test mode allows you to determine the faults that are also fixed by the usual self-diagnosis.
To obtain a diagnostic output code in test mode, perform the following procedures.
1. Check the initial conditions.
A) The battery voltage is at least 11 volts.
b) The engine is warmed up to normal operating temperature.
V) The gear lever is in the neutral position.
G) All accessories are off.
2. Short-circuit the terminals with a suitable wire "TE2" And "E1" diagnostic connector, then turn on the ignition, and the self-diagnosis system will operate in test mode.
Attention: confirmation that the self-diagnostic system is operating in test mode is the flashing of the display "CHECK" with the ignition on. In this case, the time between the end and the beginning of successive pulses (outbreaks), that is, the duty cycle of the pulses, is 0.13 s.
3. Start the engine and drive the vehicle at a speed of 10 km/h or more.
4. Simulate the situations in which the malfunction occurs.
5. Bridge the leads with a suitable wire "TAG and "E1" diagnostic connector.
6. Read the diagnostic codes by the number of flashes of the light board "CHECK".
7. At the end of the diagnosis, disconnect the wires from the diagnostic connector.
Attention:
- - The system will not go into test mode if the outputs "TE2" And "E1" will be bridged after the ignition is switched on.
- - When the vehicle speed is 5 km/h and below, code No. 42 will be displayed (speed sensor), which is not a malfunction.
- - If the engine is not cranked by the starter, code No. 43 will be displayed (starter), which is not a malfunction.
- - If the automatic transmission control lever is in the positions: "D", "2", "L" or "R", or if the air conditioner is on, or if the accelerator pedal is fully depressed, then code No. 51 is displayed ("turning on the air conditioner"), which, however, is not a sign of a malfunction.
4. Read the diagnostic code by the number of blinks (outbreaks) control lamp "CHECK". (See the table below for diagnostic codes).