Suzuki Grand Vitara Service Manual page 243

Step
4 Main relay circuit check
1) Turn ignition switch to OFF position.
2) Check "FI" fuse (1) (20 A) in fuse box No.2 for blowing.
3) If OK, measure voltage between "E23-60" terminal of
ECM connector and body ground.
Is voltage 10 – 14 V?
5 Main relay circuit check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Turn ignition switch to ON position.
3) Measure voltage between "E23-60" terminal of ECM
connector and body ground.
Is voltage 0 – 1 V?
6 ECM ground circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from ECM.
3) Measure resistance between each "C37-15", "C37-30",
"C37-29", "C37-48" and "C37-58" terminals of ECM
connector and body ground.
Ω
Is resistance 1 or less?
7 Main relay circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Using service wire, ground "E23-60" terminal of ECM
connector and measure voltage between each "E23-1"
and "E23-16" terminals of ECM connector and body
ground.
Is voltage 10 – 14 V?
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Action
For J20 engine
1
For M16 engine
1
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Engine General Information and Diagnosis:
Yes
Go to Step 5.
I5JB0A110097-02
I5JB0A110098-02
Go to Step 7.
Substitute a known-
good ECM and recheck.
Go to Step 11.
1A-236
No
Go to Step 9.
Go to Step 6.
"BLK/ORN" or "BLK/
YEL" wire is open or
high resistance circuit.
Go to Step 8.