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4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS 6E–343 27 Using the vacuum pump and check the exhaust • Restrict shaft movement. Check for objects sticking the shaft, broken diaphragm or excessive carbon Was a problem found? — Verify repair Go to Step 28 28 Check the exhaust system for a possible restriction. • Damaged or collapsed pipes or catalytic converter. • Internal muffler failure. — Verify repair Go to Step 29 29 Visually/physically inspect for the following conditions. • Restrict fuel supply system. Check for a pinched fuel hose/pipe. • Check for a condition that causes fuel waxing or icing, such as the customer is using an incorrect If a problem is found, repair as necessary. — Verify repair Go to Step 30 30 Replace the fuel filter. — Verify repair Go to Step 31 Step Action Value(s) Yes No |