Suzuki 2000 Grand Vitara SQ625 Service Manual page 104

6-100 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
TABLE B-2 FUEL INJECTORS AND CIRCUIT INSPECTION
WIRING DIAGRAM
1. Main relay
2. Injector No.1
3. Injector No.2
4. Injector No.3
5. Injector No.4
6. To ignition switch
INSPECTION
STEP
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?
2 Wire Harness Check:
1) Remove ECM (PCM) cover and disconnect
connectors from ECM (PCM).
2) Check for resistance between following terminals
of ECM (PCM) connector disconnected.
C51-2-1 – C51-3-4
C51-2-2 – C51-3-4
C51-2-8 – C51-3-4
C51-2-9 – C51-3-4
Is check result as specified?
3 Does none of 4 injectors make operating sound
at Step 1?
4 Check power circuit of injectors for open and short.
Is it normal?
ACTION
13 – 16 W at
20_C, 68_F
YES
Go to Step 2.
Fuel injector circuit
is in good condition.
Go to Step 4.
Check all 4 injectors
for resistance
respectively.
If resistance is OK,
substitute a known-
good ECM (PCM)
and recheck.
NO
Go to Step 3.
"P", "P/B", "P/G" and
"P/Bl" shorted each
other.
Check coupler connec-
tion and wire harness of
injector not making oper-
ating sound and injector
itself (Refer to "Fuel
Injector Inspection" in
Section 6E1).
Power circuit open or
short.