Suzuki 2000 Grand Vitara SQ416, Service Manual

Page: 235 / 729

YH4
GRAND
VITARA
6-1-124 ENGINE (H25 ENGINE)
10 – 14
at 20 C
10 – 14 V
TROUBLESHOOTING
STEP ACTION YES NO
1 Fuel Injector Operation check:
(1) Using sound scope, check each injector for
operating sound at engine cranking.
Do all 6 injectors make operating sound?
Go to Step 2. Go to Step 3.
2 Fuel Injector Circuit check:
(1) Remove ECM (PCM) cover.
(2) With ignition switch OFF, remove ECM (PCM)
couplers.
(3) Check resistance between following terminals.
C51-2-6 – C51-2-20
C51-2-7 – C51-2-20
C51-2-18 – C51-2-20
C51-2-19 – C51-2-20
C51-2-27 – C51-2-20
C51-2-28 – C51-2-20
Is check result as specified?
Fuel injector circuit is
in good condition. Go to Step 3.
3 Does not of 6 injectors make operating sound at
Step 1? Go to Step 4. Faulty wire harness.
4 Fuel Injector Power Circuit check:
(1) Connect ECM (PCM) couplers.
(2) With ignition switch ON, check voltage between
following terminals.
C51-2-6 – ground
C51-2-7 – ground
C51-2-18 – ground
C51-2-19 – ground
C51-2-27 – ground
C51-2-28 – ground
Is check result as specified?
Substitute a known-
good ECM (PCM)
and recheck. Faulty “Bl / B” wire.