Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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6-120 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES)
Table B-2 Fuel Injectors and Circuit Inspection
WIRING DIAGRAM
INSPECTION
1. Main relay 3. Injector No.2 5. Injector No.4 7. ECM (PCM)
2. Injector No.1 4. Injector No.3 6. To ignition switch
Step Action Yes No
1 Check Injector for Operating Sound.
Using sound scope, check each injector for
operating sound at engine cranking.
Do all 4 injectors make operating sound? Go to Step 2. Go to Step 3.
2 Wire Harness Check :
1) Remove ECM (PCM) cover and discon-
nect connectors from ECM (PCM).
2) Check for resistance between following
terminals of ECM (PCM) connector dis-
connected.
Fuel injector circuit resistance
C51-2-1 – C51-3-4, C51-2-2 – C51-3-4,
C51-2-8 – C51-3-4, C51-2-9 – C51-3-4
: 13 – 16
Ω
at 20°C, 68°F
Is check result as specified?
Fuel injector circuit is in
good condition. “PNK”, “PNK/BLK”, “PNK/
GRN” and “PNK/BLU”
shorted each other.
3 Does none of 4 injectors make operating
sound at Step 1? Go to Step 4. Check coupler connection
and wire harness of injector
not making operating sound
and injector itself (Refer to
“Fuel Injector” in Section
6E1).