Prepare fixtures «12.1.301» And «12.7.050». Read information from the memory of malfunctions of the ECU KSUD (DME). Remove the sound-absorbing casing of the ignition coils. Open the control electronics compartment.
Open the latch and disconnect the loop (1, fig. 5.177) coils in the direction indicated by the arrow. Slightly pull up the coil (2) ignition and perform similar actions on all rod ignition coils.
Install fixture «12.7.050» (1, fig. 5.178) between the spark plug and the ignition coil.
Carry out further actions in accordance with the System Manual «DIS».
Note. The ignition signal is multi-spark, its shape is shown in Figure 5.179.
The multi-spark ignition signal has the following characteristics:
- (1), breakdown start;
- (2), the height of the amplitude of the ignition voltage;
- (3), the magnitude of the spark formation voltage;
- (4), the duration of the spark discharge;
- (5), voltage curve at the spark plug electrodes;
- (6), the beginning of the oscillation damping process;
- (7), the process of damping oscillations.
Note. The magnitude of the voltage pulse on the oscillogram is approximately 20–25% lower than its actual magnitude.
It is not the height of the voltage pulse that is important, but the uniformity of the operation of all cylinders.