Suzuki SWIFT RS415 2017, Service Manual

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1A-122 Engine General Information and Diagnosis:
DTC Troubleshooting
WARNING:
In order to reduce risk of fire and personal injury, this work must be performed in a well ventilated area
and away from any open flames such as gas water heater.
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: ”.
• Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and
confirm that the trouble has been corrected.
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2. Go to “Engine and
Emission Control
System Check: ”.
2 EVAP canister purge power supply circuit check
1) Turn OFF ignition switch and disconnect connector from
EVAP canister purge valve.
2) Measure voltage between engine ground and “BLK/
RED” wire terminal of EVAP canister purge valve
connector with ignition switch turned ON.
Is it voltage 10 – 14 V?
Go to Step 3. “BLK/RED” wire is open
circuit.
3 Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “C37-29” terminal of ECM
connector and vehicle body ground.
Is resistance infinity?
Go to Step 4. “BLU/BLK” wire is
shorted to ground
circuit.
4 Wire circuit check
1) Measure voltage between “C37-29” terminal of ECM
connector and vehicle body ground with ignition switch
turned ON.
Is voltage 0 V?
Go to Step 5. “BLU/BLK” wire is
shorted to other circuit.
5 Wire circuit check
1) Connect connector to purge control valve with ignition
switch turned OFF.
2) Turn ON ignition switch and measure voltage between
“C37-29” terminal of ECM connector and vehicle body
ground.
Is it voltage 10 – 14 V?
Go to Step 6. “BLU/BLK” wire is open
circuit.
6 EVAP canister purge control valve check
1) Check EVAP canister purge control valve referring to
“EVAP Canister Purge Valve Inspection: in Section 1B”.
Is it in good condition?
Go to Step 7. Faulty EVAP canister
purge control valve.
7 EVAP canister purge control circuit check
1) With ignition switch turn OFF, measure resistance
between “E23-1/16” terminal and “C37-29” terminal of
ECM connector.
Is resistance below 40
:
at 20
q
C, 68
q
F?
Faulty ECM. Substitute
a known-good ECM and
recheck. “BLK/RED” and/or
“BLU/BLK” wire are high
resistance circuit.