Suzuki Swift Sport 2004 Service & Repair Manual page 181

DTC Troubleshooting
NOTE
• 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
1 Was "Engine and Emission Control System Check"
performed?
2 A/C refrigerant pressure sensor power supply circuit
check
1) Disconnect connector from A/C refrigerant pressure
sensor with ignition switch turned OFF.
2) Check for proper connection of A/C refrigerant pressure
sensor at "GRY/RED", "RED" and "ORN" wire terminals.
3) Turn ON ignition switch, measure voltage between
engine ground and "GRY/RED" wire terminal of A/C
refrigerant pressure sensor connector.
Is voltage 4 – 6 V?
3 A/C refrigerant pressure sensor power supply circuit
check
1) Disconnect connectors from MAP sensor with ignition
switch turned OFF.
2) Turn ON ignition switch, measure voltage between
engine ground and "GRY/RED" wire terminal of A/C
refrigerant pressure sensor connector.
Is voltage 4 – 6 V?
4 A/C refrigerant pressure sensor power supply circuit
check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between engine ground and "C37-
14" terminal of ECM connector.
Is resistance infinity?
5 A/C refrigerant pressure sensor signal circuit check
1) Connect connectors to ECM.
2) Turn ON ignition switch, measure voltage between
engine ground and "RED" wire terminal of A/C
refrigerant pressure sensor connector.
Is voltage 4 – 6 V?
6 A/C refrigerant pressure sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between engine ground and "E23-
55" terminal of ECM connector.
Is resistance infinity?
Action
Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 5.
Faulty MAP sensor.
Go to Step 6.
Go to Step 7.
Go to Step 7.
1A-131
No
Go to "Engine and
Emission Control
System Check".
Go to Step 3.
Go to Step 4.
"GRY/RED" wire is
shorted to ground
circuit.
Go to Step 6.
"RED" wire is shorted to
ground circuit.