Suzuki DF70A Service Manual page 89

Troubleshooting Without Self-Diagnostic Code
Before troubleshooting, make sure that there is not a self-diagnostic code indication.
Condition
Unstable idling / trolling
(or engine tends to stall)
Possible cause
Clogged MAP sensor vacuum passage. Check the vacuum passage.
Malfunctioning TPS.
Faulty IAC system.
Fuel pressure out of specification.
Faulty injector or its circuit.
Poor performance of the IAT sensor,
TPS or MAP sensor.
Faulty ECM.
Faulty spark plug.
Faulty ignition coil or its circuit.
Engine General Information and Diagnosis:
Correction / Reference Item
Check the TPS sensor.
Check the IAC system.
Check the fuel pressure.
Check the injector and its circuit.
Check each sensor.
Replace.
Replace.
Check the ignition coil and its circuit.
1A-37
Z9J0111104018