Suzuki AN400 - Page 71

Engine General Information and Diagnosis: 1A-8
Engine will not start or is
hard to start (No fuel
reaching the intake
manifold)
Clogged fuel filter or fuel hose. Clean or replace.
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Defective fuel injector. Replace.
Defective fuel pump relay. Replace.
Defective ECM. Replace.
Open-circuited wiring connections. Check and repair.
Engine will not start or is
hard to start (Incorrect
fuel/air mixture)
TP sensor out of adjustment. Adjust.
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Defective TP sensor. Replace.
Defective CKP sensor. Replace.
Defective IAP sensor. Replace.
Defective ECM. Replace.
Defective ECT sensor. Replace.
Defective IAT sensor. Replace.
Engine idles poorly Valve clearance out of adjustment. Adjust.
Poor seating of valves. Replace or repair.
Defective valve guides. Replace.
Worn down camshafts. Replace.
Too wide spark plug gap. Adjust or replace.
Defective ignition coil. Replace.
Defective crankshaft position sensor. Replace.
Defective ECM. Replace.
Defective throttle position sensor. Replace.
Defective fuel pump. Replace.
Defective ISC valve. Replace.
Engine stalls often
(Incorrect fuel/air mixture)
Defective IAP sensor or circuit. Repair or replace.
Clogged fuel filter. Clean or replace.
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Damaged or cracked vacuum hose. Replace.
Defective ECT sensor. Replace.
Defective thermostat. Replace.
Defective IAT sensor. Replace.
Engine stalls often (Fuel
injector improperly
operating)
Defective fuel injector. Replace.
No injection signal from ECM. Repair or replace.
Open or short circuited wiring
connection.
Repair or replace.
Defective battery or low battery voltage. Replace or recharge.
Engine stalls often
(Control circuit or sensor
improperly operating)
Defective ECM. Replace.
Defective fuel pressure regulator. Replace.
Defective TP sensor. Replace.
Defective IAT sensor. Replace.
Defective CKP sensor. Replace.
Defective ECT sensor. Replace.
Defective fuel pump relay. Replace.
Engine stalls often
(Engine parts improperly
operating)
Fouled spark plug.
Clean.
Defective CKP sensor or ECM. Replace.
Clogged fuel hose. Clean.
Valve clearance out of adjustment. Adjust.
Engine noisy (Excessive
valve chatter)
Too large valve clearance. Adjust.
Weakened or broken valve springs. Replace.
Worn tappet or cam surface. Replace.
Worn and burnt camshaft journal. Replace.
Condition Possible cause Correction / Reference Item