Suzuki 2000 Grand Vitara SQ416, Service Manual

Page: 177 / 729

YH4
GRAND
VITARA
6-1-66 ENGINE (H25 ENGINE)
STEP ACTION YES NO
3 HO2S Voltage check:
(1) Remove ECM (PCM) cover.
(2) Start engine and check voltage between C51-3-4
and C51-3-21 while repeating racing engine.
Does the voltage indicate 0.5 V or more even at once?
Poor C51-3-4 and / or
C51-3-21 terminal
connection.
If OK, substitute a
known-good ECM
(PCM) and recheck. Go to Step 4.
4 Wire Harness check:
(1) Check “R” and “Gr / Y” wire.
Are they in good condition? Go to Step 5. Repair or replace.
5 Fuel Injector Circuit check:
(1) Check fuel injector circuit referring to “TABLE B-2”
in this section.
Is it in good condition?
Go to Step 6. Repair or replace.
6 Fuel Injector inspection:
(1) Inspect fuel injectors (No.1, 3, 5) referring to
“ENGINE AND EMISSION CONTROL” section.
Are they in good condition?
Go to Step 7. Faulty fuel injector(s).
7 Fuel Pressure inspection:
(1) Check fuel pressure referring to following
“TABLE B-3” in this section.
Is fuel pressure within specification?
Replace HO2S and
recheck.
If DTC P0134 (DTC
No.13) detected,
substitute a known-
good ECM (PCM)
and recheck. Repair or replace.