DTC Troubleshooting

DIAGNOSTIC PROCEDURES CHART

Step	Action	YES	NO
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2.	Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2	Fuel level check Check fuel level by fuel meter. Is indicate "E" level (empty)?	Add fuel and recheck DTC.	Go to Step 3.
3	DTC check Check DTC. Is there DTC(s) other than P0300, P0301, P0302, P0303 and P0304?	Go to applicable DTC (s).	Go to Step 4.
4	Air intake system and exhaust system inspection Check exhaust system and air intake system for clogging or leak. Are they in good condition?	Go to Step 5.	Repair or replace defective parts.
5	Ignition system inspection Check ignition system, see IGNITION SYSTEM CHECK . Is it in good condition?	Go to Step 6.	Repair or replace defective parts.
6	Engine mechanical systems check Check engine mechanical parts or system which can cause engine rough idle or poor performance. Engine compression: COMPRESSION CHECK Valve clearance: VALVE CLEARANCE INSPECTION AND ADJUSTMENT Valve timing: CAMSHAFT AND TAPPET REMOVAL AND INSTALLATION Are they in good condition?	Go to Step 7.	Repair or replace defective parts.
7	Fuel system inspection Check fuel system, see FUEL SYSTEM INSPECTION . Is it in good condition?	Replace ECM and recheck DTC, see ECM REMOVAL AND INSTALLATION .	Repair or replace defective parts or wire harness.