Suzuki SX4 Service Manual page 246

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1A-196 Engine General Information and Diagnosis:
Step
6
ECM ground circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from ECM.
3) Measure resistance between each "E01-31", "C01-58",
"C01-15" and "C01-30" terminals of ECM connector and
body ground.
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 "E01-60" terminal of ECM
connector and measure voltage between each "E01-1"
and "E01-16" terminals of ECM connector and body
ground.
Is voltage 10 – 14 V?
8
Main relay circuit check
1) Remove main relay (1) from individual circuit fuse box
No.1.
2) Check for proper connection to main relay connector at
"BLK/YEL" and "BLK/RED" wire terminals.
3) If OK, measure resistance between each "E01-1" and
"E01-16" wire terminals of ECM connector and "BLK/
RED" wire terminal of main relay connector.
Is resistance 1
or less?
9
Main relay circuit check
1) Remove main relay from individual circuit fuse box No.1
with ignition switch turned OFF.
2) Measure voltage between "BLK/YEL" wire terminal of
main relay connector and body ground.
Is voltage 10 – 14 V?
10 Main relay check
1) Check main relay referring to "Main Relay, Fuel Pump
Relay, Starting Motor Control Relay, Throttle Actuator
Control Relay and Radiator Cooling Fan Relay
Inspection in Section 1C".
Is main relay in good condition?
Action
1
I5RW0A110059-02
Yes
Substitute a known-
good ECM and recheck.
Go to Step 11.
Go to Step 9.
Go to Step 10.
"BRN/WHT" wire is
open or high resistance
circuit.
No
"BLK/ORN" or "BLK"
wire is open or high
resistance circuit.
Go to Step 8.
"BLK/RED" wire is open
circuit or high resistance
circuit.
"BLK/YEL" wire is open
circuit.
Replace main relay.

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