Suzuki SX4 Service Manual page 250

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1A-200 Engine General Information and Diagnosis:
Troubleshooting
NOTE
• Before performed trouble shooting, be sure to read the "Precautions of ECM Circuit Inspection".
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to "Inspection of ECM and Its Circuits".
Step
1
Fuel pump control system check for operation
Is fuel pump heard to operate 2 sec. after ignition switch is
turned ON?
2
Fuel pump relay power supply check
1) Disconnect fuel pump relay from individual circuit fuse
box No.1 with ignition switch turned OFF.
2) Check for proper connection to fuel pump relay at each
terminal.
3) If OK, turn ON ignition switch, measure voltage between
"BLK/WHT" wire terminal of fuel pump relay connector
and engine ground.
Is voltage 10 – 14 V?
3
Fuel pump relay power supply check
1) Turn ON ignition switch, measure voltage between "BLK/
RED" wire terminal of fuel pump relay connector and
engine ground.
Is voltage 10 – 14 V?
4
Fuel pump relay check
1) Check fuel pump 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 relay in good condition?
5
Fuel pump relay drive signal check
1) Connect fuel pump relay to individual circuit fuse box
No.1.
2) Connect voltmeter between "E01-15" terminal of ECM
connector and vehicle body ground.
3) Measure voltage 2 second after ignition switch is turned
ON.
Is voltage 10 – 14 V?
Action
I2RH01110132-01
Yes
Fuel pump circuit is in
good condition.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
No
Go to Step 2.
"BLK/WHT" wire is open
or shorted to ground
circuit.
"BLK/RED" wire is open
circuit.
Faulty relay.
"GRN/WHT" wire is
open circuit or shorted
to ground circuit.

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