Suzuki Engine 2002 GRAND VITARA SQ625, Руководство по обслуживанию

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ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE) 6-1-131
• Intake air temperature : between 5°C and 70°C (6.8°F and 158°F)
• Atmospheric pressure : higher than 560 mmHg (Altitude : lower than 2790 m (9150 ft))
1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Start engine and warm up to normal operating temperature.
4) Increase vehicle speed to 56 km/h (35 mph) for 30 sec.
5) Stop vehicle and run engine at idle speed for 10 sec.
6) Check DTC and pending DTC by using scan tool.
DTC TROUBLESHOOTING
Fig. for Step 3
Step Action Yes No
1 Was “Engine Diag. Flow Table” performed? Go to Step 2. Go to “Engine Diag. Flow
Table”.
2 MAP Sensor Signal check :
1) Remove ECM (PCM) cover.
2) Check voltage between C51-3-13 and C51-
3-21 as following conditions. with ignition
switch on
leaving engine OFF : 3.3 – 4.3 V
idling : less than 3.3 V
Is check result as specified?
Intermittent trouble.
If OK, substitute a known-
good ECM (PCM) and
recheck. Go to Step 3.
3 MAP Sensor Power Supply Voltage check :
1) With ignition switch OFF, disconnect coupler
from MAP sensor.
2) Check voltage between “GRY/RED” wire
terminal and “GRY/YEL” wire terminal.
Is voltage 4.5 – 5.5 V?
Faulty “RED/WHT” wire.
If OK, substitute a known-
good MAP sensor and
recheck. Faulty “GRY/RED”, “GRY/
YEL” wire.
If OK, substitute a known-
good ECM (PCM) and
recheck.