Suzuki GA413 Service Manual page 865

STEP
3 Check MAP Sensor
1) Remove MAP sensor from intake manifold and connect
vacuum pump gauge to MAP sensor. See Fig. 1.
2) Connect scan tool to DLC and turn ignition switch ON.
3) Check intake manifold absolute pressure displayed on
scan tool under following conditions.
Applying Vacuum
0
27 kPa
200 mmHg
67 kPa
500 mmHg
Is check result satisfactory?
Fig. 1 for Step 2
ACTION
Displayed Value on Scan Tool
Barometric pressure
(Approx. 100 kPa, 760 mmHg)
Barometric pressure – 27 kPa
(Approx. 73 kPa, 560 mmHg
Barometric pressure – 67 kPa
(Approx. 33 kPa, 260 mmHg)
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-89
YES
Check air intake
system for air
being drawn in
and engine
compression.
If OK, then
substitute a
known-good ECM
and recheck.
NO
Replace MAP
sensor.