Suzuki 2000 Grand Vitara SQ625 Service Manual page 235

6-1-124 ENGINE (H25 ENGINE)
TROUBLESHOOTING
STEP
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?
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?
3 Does not of 6 injectors make operating sound at
Step 1?
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?
ACTION
10 – 14 W
at 20_C
10 – 14 V
YES
Go to Step 2.
Fuel injector circuit is
in good condition.
Go to Step 4.
Substitute a known-
good ECM (PCM)
and recheck.
NO
Go to Step 3.
Go to Step 3.
Faulty wire harness.
Faulty "Bl/B" wire.