Suzuki GA413 Service Manual page 306

6-14 ENGINE
Condition
Excessive
hydrocarbon (HC)
emission or
Excessive carbon
monoxide (CO)
emission
Excessive nitrogen
oxides (NOx)
emission
Possible Cause
Ignition system out of order
D Faulty ignition coil or high-tension cord
Engine and Emission control system
out of order.
D Fuel pressure out of specification
D Lead contamination of three way catalytic
converter (if equipped)
D Malfunctioning PCV system
D Faulty EVAP control system
D Closed loop system (A / F feed back
compensation) fails (vehicle with HO2S)
– Faulty TP sensor
– Faulty ECT sensor or MAP sensor
– Faulty HO2S
D Maladjusted CO adjusting resistor
(vehicle without HO2S)
D Faulty injector
D Faulty ECM
Low compression
Engine and emission control system
D Fuel pressure out of specification
D Lead contamination of three way catalytic
converter (if equipped)
D Faulty EGR system (if equipped)
D Closed loop system (A / F feed back
compensation) fails (vehicle with HO2S)
– Faulty TP sensor
– Faulty ECT sensor or MAP sensor
– Faulty HO2S
D Faulty injector
D Faulty ECM
Referring Item
Diagnosis in Section 6F.
Fuel pressure check in Section 6E.
Check for absence of filler neck re-
strictor.
PCV system in Section 6E.
EVAP control system check in
Section 6E.
Check oxygen sensor output voltage.
Refer to DTC No.14 Heated Oxygen
Sensor Circuit in Section 6E.
Idle mixture adjustment in Section 6E.
Fuel injector injection volume inspec-
tion in Section 6E.
Inspection of ECM and its circuit in
Section 6E.
Previously outlined.
Fuel pressure check in Section 6E.
Check for absence of filler neck re-
strictor.
Diag. Flow Table B-6 in Section 6E.
Check oxygen sensor output voltage.
Refer to DTC No.14 Heated Oxygen
Sensor Circuit in Section 6E.
Fuel injector injection volume inspec-
tion in Section 6E.
Inspection of ECM and its
circuit in Section 6E.