Suzuki Swift Sport 2004 Service & Repair Manual page 188

1A-138 Engine General Information and Diagnosis:
DTC Detecting Condition and Trouble Area
DTC detecting condition
• Battery voltage is higher than specification even through
generator control is maximum regulation (duty 100%).
• Battery voltage is lower than specification even through
generator control is minimum regulation (duty 0%) and electric
load is less than 15 A.
(1 driving cycle detection logic but MIL does not light up)
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool to DLC
2) Turn ON ignition switch and clear DTC.
3) Make sure that all accessory switches are tuned OFF.
4) Start engine and warm it up to normal operating temperature (ECT approx. 90 – 95 °C, 193 – 203 °F).
5) Turn ON the following accessory switches.
• Head light switch.
• Blower motor switch (max position).
• Rear defogger switch.
6) Increase engine speed to 4000 rpm and keep it for 10 sec or more.
7) Decrease engine speed to idle.
8) Check DTC.
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 Generator drive belt check
1) Check generator drive belt tension referring to "Water
Pump / Generator Drive Belt Tension Inspection and
Adjustment in Section 1J".
Is check result satisfactory?
Action
Trouble area
• Generator and/or its circuit
• Electric load current sensor
• ECM
• Generator drive belt
Yes
Go to Step 2.
Go to Step 3.
No
Go to "Engine and
Emission Control
System Check".
Adjust or replace
generator drive belt.