Suzuki 2000 Grand Vitara SQ625 Service Manual page 226

D Intake air temperature: between 5 C and 70 C (6.8 F and 158 F)
D 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
1 Was "ENGINE DIAG. FLOW TABLE" performed?
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:
Is check result as specified?
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?
Fig. for STEP 3
ACTION
less than 3.3 V
ENGINE (H25 ENGINE) 6-1-115
YES
Go to Step 2.
Intermittent trouble.
If OK, substitute a
known-good ECM
(PCM) and recheck.
Faulty "R/W" wire.
If OK, substitute a
known-good MAP
sensor and recheck.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Go to Step 3.
Faulty "Gr/R", "Gr/Y"
wire.
If OK, substitute a
known-good ECM
(PCM) and recheck.