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4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS 6E–379 EXCESSIVE BLACK SMOKE Step Action Value(s) Yes No 1 Was the “On-Board Diagnostic (OBD) System Check” — Go to Step 2 Go to On Board Diagnostic (OBD) System Check 2 1. Perform a bulletin search. 2. If a bulletin that addresses the symptom is found, correct the condition as instructed in the bulletin. Was a bulletin found that addresses the symptom? — Verify repair Go to Step 3 3 Was a visually/physical check performed? — Go to Step 4 Go to Visual / physical Check. 4 Is the customer using the incorrect fuel type? Diesel fuel only Replace with diesel fuel Go to Step 5 5 Visually/physically inspect for the following conditions. • Restrict air intake system. Check for a restricted air filter element, or foreign objects blocking the air • Check for objects blocking or excessive deposits in the throttle bore and on the throttle plate • Check for a condition that causes a large vacuum leak, such as an incorrectly installed or faulty • Restrict air intake system at the turbocharger. — Verify repair Go to Step 6 6 Check the ECM & PSG grounds to verify that they are — Verify repair Go to Step 7 7 1. Using the Tech 2, display the ECT sensor and IAT sensor value. 2. Check the displayed value. Does the Tech 2 indicate correct temperature — Verify repair Go to Step 8 8 1. Using the Tech 2, display the FT sensor value. 2. Check the displayed value. Does the Tech 2 indicate correct temperature — Go to Step 22 Go to Step 9 9 1. Using the Tech 2, ignition “On” and engine “Run”. 2. Monitor the “Mass Air Flow” in the data display. Does the Tech 2 indicate correct “Mass Air Flow” — Go to Step 14 Go to Step 10 |