Suzuki SWIFT RS415 2017, Service Manual

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1A-126 Engine General Information and Diagnosis:
4 Fuel level sensor output signal check with SUZUKI scan
tool
1) Connect SUZUKI scan tool to DLC with ignition switch
turned OFF.
2) Turn ON ignition switch and check fuel level displayed
on SUZUKI scan tool.
Is it 3% or less?
Go to Step 6. Intermittent trouble or
faulty ECM.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00”.
5 Fuel level sensor output signal check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Turn ON ignition switch and measure voltage between
“E23-24” terminal of ECM connector and vehicle body
ground.
Is voltage about 3.5 V or more?
Go to Step 6. Intermittent trouble or
faulty ECM.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00”.
6 Fuel level sensor circuit resistance check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection to “E23-24” terminal of
ECM connector.
3) If OK, measure resistance between “E23-24” terminal of
ECM connector and vehicle body ground.
Is resistance below 280
:
?
Go to Step 7. Go to Step 8.
7 Short circuit check for fuel level sensor output signal
circuit
1) Turn ON ignition switch and measure voltage between
“E23-24” terminal of ECM connector and vehicle body
ground.
Is voltage 0 V?
Go to Step 8. “YEL/RED” wire is
shorted to power supply
circuit.
8 Open circuit check for fuel level sensor output signal
circuit
1) Disconnect fuel pump connector referring to “Fuel Tank
Removal and Installation: in Section 1G”.
2) Check for proper connection to “YEL/RED” and “BLK/
ORN” wire terminals of fuel pump connector.
3) Connect connectors to ECM.
4) Turn ON ignition switch, measure voltage between “YEL/
RED” wire terminal of disconnected fuel pump connector
and vehicle body ground.
Is voltage 10 – 14 V?
Go to Step 10. Go to Step 9.
9 Open circuit check for fuel level sensor output signal
circuit
1) Measure voltage between “E23-24” terminal of ECM
connector and engine ground.
Is voltage 10 – 14 V?
Go to Step 10. “YEL/RED” wire is open
circuit.
10 Fuel level sensor ground circuit check
1) Turn ignition switch to OFF position.
2) Measure resistance between “BLK/ORN” wire terminal
of fuel pump connector and vehicle body ground.
Is resistance below 5
:
?
Go to Step 11. “BLK/ORN” wire is open
or high resistance
circuit.
Step Action Yes No