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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)] 01–03A–53 01–03A Diagnostic procedure STEP INSPECTION ACTION 1 • Remove all spark plugs. • Inspect each spark plug. • Is condition of spark plugs okay? Yes Troubleshooting completed. No Specific plug is wet or covered with carbon: • Go to next step. Specific plug looks grayish white: • Go to Step 7. All plugs are wet or covered with carbon: • Go to Step 9. All plugs look grayish white: • Go to Step 15. 2 • Are any of sparks plug wet/covered with Yes Working up and down, inspect all areas related to oil. No Go to next step. 3 • Inspect spark plugs for following. • Are spark plugs okay? Yes Go to next step. No Replace spark plug. 4 • Inspect compression pressure at suspected • Is compression pressure correct? Yes Go to next step. No Repair or replace malfunctioning part. 5 • Install all spark plugs. • Carry out spark test at suspected faulty • Is strong blue spark visible? (Compare with Yes Go to next step. No Repair or replace malfunctioning part. 6 • Perform fuel line pressure inspection. • Is fuel line pressure okay? Yes Inspect fuel injector for following: • Open or short in injector • Leakage • Injection volume No Zero or low: • Inspect fuel pump circuit. • Inspect for open fuel pump relief valve open. • Inspect for fuel leakage inside pressure regulator. • Inspect for clogged main fuel line. High: • Inspect pressure regulator for high pressure cause. • Inspect for clogged fuel return line. 7 • Inspect spark plugs for following. • Are they okay? Yes Go to next step. No Replace spark plug. 8 • Remove suspected fuel injector. • Inspect following: (See 01–14–24 Resistance Inspection.) — Fuel injection volume (See 01–14–26 Volume Test.) • Are all above items okay? Yes Inspect for open circuit between suspected fuel injector • For #1 cylinder: 75 • For #2 cylinder: 101 • For #3 cylinder: 74 • For #4 cylinder: 100 No Replace fuel injector. 9 • Is air cleaner element free of restrictions? Yes Go to next step. No Replace air cleaner element. 10 • Carry out spark test. • Is strong blue spark visible at each cylinder? Yes Go to next step. No Repair or replace malfunctioning part. 1712-1U-01G(01-03A).fm 53 ページ 2001年6月29日 金曜日 午後4時45分 |