Diagnostic Information And Procedures; Engine Symptom Diagnosis - Suzuki RMX450Z Service Manual

1A-7 Engine General Information and Diagnosis:

Engine Symptom Diagnosis

Condition
Engine will not start or is
hard to start
(Compression too low)
Engine will not start or is
hard to start (Plug not
sparking)
Engine will not start or is
hard to start (No fuel
reaching the intake
manifold)
Engine will not start or is
hard to start (Incorrect
fuel/air mixture)
Engine idles poorly
Engine stalls often
(Incorrect fuel/air mixture)

Diagnostic Information and Procedures

Possible cause
Valve clearance out of adjustment.
Worn valve guides or poor seating of
valves.
Mistimed valves.
Excessively worn piston rings.
Worn-down cylinder bore.
Starter motor cranks too slowly.
Poor seating of spark plug.
Broken, cracked, or damaged piston.
Defective automatic decomp.
Fouled spark plug.
Wet spark plug.
Incorrect spark plug gap.
Defective spark plug cap.
Defective ignition coil.
Open or short in high-tension cord.
Defective CKP sensor.
Defective ECM.
Open-circuited wiring connections.
Defective magneto.
Clogged fuel feed hose or fuel delivery
pipe.
Defective fuel pump.
Defective fuel injector.
Defective ECM.
Open-circuited wiring connections.
Defective TO sensor.
Defective fuel pump.
TP sensor out of adjustment.
Defective TP sensor.
Defective CKP sensor.
Defective IAP sensor.
Defective ECM.
Defective ECT sensor.
Defective IAT sensor.
Valve clearance out of adjustment.
Valve timing out of adjustment.
Poor seating of valves.
Worn valve guides.
Worn camshaft.
Incorrect spark plug gap.
Defective ignition coil.
Defective fuel pump.
Defective CKP sensor.
Defective ECM.
Defective TP sensor.
Insufficient throttle cable play.
Defective IAP sensor or circuit.
Defective fuel pump.
Defective ECT sensor.
Defective IAT sensor.
Correction / Reference Item
Adjust.
Repair or replace.
Adjust.
Replace.
Replace.
Refer to "Starting System Diagram" in Section
1I (Page 1I-1).
Retighten.
Replace.
Clean or replace.
Clean.
Clean and dry.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Clean or replace.
Replace.
Replace.
Replace.
Check and repair.
Replace.
Replace.
Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Adjust.
Replace or repair.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Repair or replace.
Replace.
Replace.
Replace.
BA02J21104001