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57
The "Diagnostics" allows you to perform basic tests of selected components.
The test is as follows:
Injectors
–
controller opens the selected injector for 4ms every second. The test lasts for 5
seconds. If the selected option is "All", injectors are tested sequentially from the first to the last,
every for 5 seconds,
Solenoid valve
–
controller opens solenoids for 5 seconds,
Buzzer
–
controller emits beeps (maximum for 3 seconds),
LED
–
controller enables another LED at short intervals.
2.25.2. Service
The "Service" allows the burning of gas from the system before replacing the filters. But to do
this, the solenoid valve located on the gas tank must be powered from the output AUX12V of controller
(via a relay), and AUX set to “Rear solenoid valve control" tab (Parameters - Advanced Settings, frame
configuration AUX).
Information on the process and possible problems are displayed on the window in real time.
Fig. 56
Gas firing
– progress window
3. STAG-4 QBOX/QNEXT/STAG-300 QMAX controller programming
The controller may be programmed using the acquired petrol map and the gas map. The procedure:
Auto-calibrate the controller
Acquire petrol map B
Acquire petrol map G
Check deviations between both maps.
3.1. Auto-calibration
Prior to starting the auto-calibration, start the engine and wait until the lambda probe begins to
work. During the auto-calibration the engine should work at idle run; do not increase rpm, switch off
air-conditioning and lights and do not turn the steering wheel as this may cause errors during the auto-
calibration. During the auto-calibration, watch carefully petrol and LPG injection times. If LPG injection
times are shorter than petrol injection times, the injector nozzles may be too large and should be
replaced with smaller diameter ones. When auto-calibration is completed, the multiplier map will be
preset. The multiplier’s value for this point should be between 1.2 and 1.8; if the value is greater than
1.8, longer times of petrol injection i.e. greater load and high rpm, may cause overlapping of injection
times i.e. one LPG injection will begin before the previous one ends (looped injections). In such a
case, the controller will display the „Too long injection time” error message.
In such case, make sure
that the Lambda sensor indicates a rich fuel mixture.
