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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)] 01–03B–41 01–03B NO.19 EXHAUST SMOKE [FS] A3U010318881W24 Diagnostic procedure 19 Exhaust smoke DESCRIPTION • Blue, black, or white smoke from exhaust system POSSIBLE CAUSE Blue smoke (Burning oil): • PCV valve malfunction • Engine internal oil leakage White smoke (Water in combustion): • Cooling system malfunction (coolant loss) • Engine internal coolant leakage Black smoke (Rich fuel mixture): • Air cleaner restriction • Intake-air system is collapsed or restricted. • Fuel return line is restricted. • Excessive fuel pressure • Improper engine compression • Injector fuel leakage • Ignition system malfunction Warning •••• Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always •••• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or STEP INSPECTION RESULTS ACTION 1 • What color is smoke coming from exhaust Blue Burning oil is indicated. White Water in combustion is indicated. Black Rich fuel mixture is indicated. 2 • Remove and shake PCV valve. • Does PCV valve rattle? Yes Inspect for following: • Damaged valve guide, stems or valve seals • Blocked oil drain passage in cylinder head • Piston rings for not seated, seized or worn • Damaged cylinder bore If other drivability symptoms are present, return to No Replace PCV valve. 3 • Does cooling system hold pressure? Yes Inspect for following: • Cylinder head gasket leakage • Intake manifold gasket leakage • Engine block cracks or porosity If other driveability symptoms are present, return to No Inspect for cause. 4 • Inspect for following: • Are all items okay? Yes Go to next step. No Service as necessary. 5 • Connect WDS or equivalent to DLC-2. • Turn ignition key to ON. • Retrieve any DTC. • Is “DTC” displayed? Yes No DTC displayed: • Go to next step. No DTC displayed: • Go to appropriate DTC test. 1712-1U-01G(01-03B).fm 41 ページ 2001年6月29日 金曜日 午前9時33分 |