Suzuki 2000 Grand Vitara SQ416, Service Manual

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YH4
GRAND
VITARA
ENGINE (H25 ENGINE) 6-1-115
Fig. for STEP 3
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
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 C51-3-20
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 C58 coupler
from MAP sensor.
(2) Check voltage between C58-3 and C58-2 terminal.
Is voltage 4.5 – 5.5 V?
Faulty “R / W” wire.
If OK, substitute a
known-good MAP
sensor and recheck. Faulty “Gr / R”, “Gr / Y”
wire.
If OK, substitute a
known-good ECM
(PCM) and recheck.