Suzuki Swift Sport 2004 Service & Repair Manual page 256

1A-206 Engine General Information and Diagnosis:
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".
• When A/C evaporator outlet air temp. is below 2.5 °C (36.5 °F), A/C remains OFF ("E23-47" terminal
voltage becomes 10 – 14 V). This condition is not abnormal.
Step
1 Reception data check from BCM
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch.
3) Check DTC for reception data from BCM.
Is there DTC P1678?
2 A/C switch signal circuit check
1) Start engine and select "DATA LIST" mode on scan tool.
2) Check A/C switch signal under following conditions
respectively.
A/C switch signal
Engine running, A/C switch OFF: OFF
Engine running, A/C switch ON and blower speed
selector turned 1st position or more: ON
Is check result satisfactory?
3 DTC check of ECT sensor circuit
1) Check ECM for DTC of ECT sensor circuit.
Is there DTC P0116, DTC P0117 or DTC P0118?
4 Radiator cooling fan control system check
Is radiator cooling fan started when A/C and blower speed
selector switch are turned ON with engine running?
5 Radiator cooling fan control circuit check
1) Check DTC with scan tool.
Is DTC P0480 displayed?
Action Yes
Go to applicable DTC
diag. flow.
Go to Step 3.
Go to applicable DTC
diag. flow.
Go to Step 10.
Go to "DTC P0480: Fan
1 (Radiator Cooling
Fan) Control Circuit".
No
Go to Step 2.
Check A/C switch
circuit.
Go to Step 4.
Go to Step 5.
Go to Step 6.