Suzuki 2000 Grand Vitara SQ416, Service Manual

Page: 228 / 729

YH4
GRAND
VITARA
ENGINE (H25 ENGINE) 6-1-117
Applying Vacuum Displayed Value on Scan Tool
0
Barometric pressure
(Approx. 100 kPa, 760 mmHg)
27 kPa
200 mmHg
Barometric pressure – 27 kPa
(Approx. 73 kPa, 560 mmHg
67 kPa
500 mmHg
Barometric pressure – 67 kPa
(Approx. 33 kPa, 260 mmHg)
Fig. for STEP 3
DTC TROUBLESHOOTING
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE
DIAG. FLOW
TABLE”.
2 1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ignition switch ON and select “DATA LIST”
mode on scan tool.
3) Check manifold absolute pressure.
Is it barometric pressure (approx. 100 kPa, 760 mmHg)
at seal level?
Substitute a known-
good ECM (PCM)
and recheck. Go to Step 2.
3 Check MAP Sensor
1) Remove MAP sensor from intake manifold and
connect vacuum pump gauge to MAP sensor.
2) Connect scan tool to DLC and turn ignition switch
ON.
3) Check intake manifold absolute pressure displayed
on scan tool under following conditions.
Is check result satisfactory?
Check air intake
system for air being
drawn in and engine
compression.
If OK, then substitute
a known-good ECM
and recheck. Replace MAP
sensor.