Suzuki 2000 Grand Vitara SQ625 Service Manual page 192

D Intake air temperature: between –14_C and 70_C (6.8_F and 158_F)
D Atmospheric pressure: higher than 560 mmHg (Altitude: lower than 2790 m (9150 ft))
D Following DTCs are not detected: P0110 (No.23, 25), P0335, P0460, P01450 and P01451
(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) or more.
(5) Keep above vehicle speed for 5 min. (Throttle valve operating is kept constant in this step.)
(6) Increase vehicle speed to 80 – 100 km/h (50 – 60 mph). (engine speed; 2500 – 3000 r/min.)
(7) Keep above vehicle speed for 1 min. (Throttle valve operating is kept constant in this step.)
(8) Release accelerator pedal and with engine brake applied, keep vehicle coasting and then stop vehicle.
(9) Check DTC and pending DTC by using scan tool.
DTC TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 HO2S Voltage check:
(1) With ignition switch OFF, install scan tool.
(2) Start engine and check "O2S B2 S2" (HO2S
voltage) displayed on scan tool while repeating
racing engine.
Does the voltage deflect between 0 – 0.25 V and
0.35 – 2.0 V?
3 Wire Harness check:
(1) Check "R/Y" and "Gr/Y" wire.
Are they in good condition?
4 Fuel Injector Circuit check:
(1) Check fuel injector circuit referring to "TABLE B-2"
in this section.
Is it in good condition?
5 Fuel Injector inspection:
(1) Inspect fuel injectors (No.2, 4, 6) referring to
"ENGINE AND EMISSION CONTROL" section.
Are they in good condition?
6 Fuel Pressure inspection:
(1) Check fuel pressure referring to following "TABLE
B-3" in this section.
Is fuel pressure within specification?
ACTION
ENGINE (H25 ENGINE) 6-1-81
YES
Go to Step 2.
Intermittent trouble.
If OK, substitute a
known-good ECM
(PCM) and recheck.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Replace HO2S and
recheck.
If DTC P0156
detected, substitute a
known-good ECM
(PCM) and recheck.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Go to Step 3.
Repair or replace.
Repair or replace.
Faulty fuel injector(s).
Repair or replace.