Suzuki Wagon R Manual page 3714

Test
T02 Tester Display – Injector Control
• Engine running at idle speed, operating temperature
• Accelerator pedal not actuated
• Vehicle stationary
• Air conditioning system switch OFF
• Press corresponding key in the system main menu to select Out-
put Test under Misc Test, select the desired test and confirm with
ENTER. Follow the instructions in the scan tool display.
• Press corresponding soft key to turn off the fuel injectors for 3 sec
sequentially.
NOTE:
• This test helps to analyses engine compression. All fuel injec-
tors are cut-off one after another. Each time an fuel injector is
cut-off, the engine must move the corresponding piston
against the compression pressure. This leads to a reduction
in torque and performance, and engine speed drops accord-
ingly. The engine speed reduction must be identical for each
injector, since the compression of all cylinders is nearly the
same as long as the system is working properly. The elec-
tronic control of the engine immediately responds to the dis-
abled cylinder by increasing the injection time of the
remaining injectors and by opening the idle air controller. In
order to avoid this, the spark angle and the idle air controller
position are adjusted to a fixed value. Engine speed is
increased to approximately 1200 rpm, with oxygen sensor
closed loop control working normally.
• The test should only be started when the cooling fan is not
running, otherwise the engine speed may be lowered by
approximately 50 rpm.
• When one cylinder has been cut-off, engine speed will drop by
approximately 150 rpm. If the cooling fan operates while the
cylinder is being cut-off, this may further reduce engine speed
by an additional 50 rpm. When an injector is switched off,
unburned oxygen from the cylinder will reach the exhaust
pipe. This lean combustion will be reflected by the oxygen
sensor showing a permanent low voltage value.
Yes: T03
T03 Tester Display – RPM Control
• Engine running at idle speed, operating temperature
• Accelerator pedal not actuated
• Vehicle stationary
• Press corresponding key in the system main menu to select Out-
put Test under Misc Test, select the desired test and confirm with
ENTER. Follow the instructions in the scan tool display.
NOTE:
The engine speed can be controlled in the range from 640 rpm to
1650 rpm (preset value: 1000 rpm).
This mode is used when various different engine parameters
must be checked at different engine speeds.
Yes: T04
ENGINE GENERAL INFORMATION AND DIAGNOSIS (Z10XEP AND Z12XEP ENGINES) 6-4-33
Work Order Description Nominal Value
Test OK?
No: C-38
Test OK?
No: C-02