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6E–332 4JH1 ENGINE DRIVEABILITY AND EMISSIONS 25 1. Using the Tech 2 and ignition “On” and engine “Run”. 2. Monitor the following parameters in the data display. • “Desired Injection Quantity” & “Injection Quantity” • “Desired Injection Start” & “Actual Injection Start” — Go to Step 29 Go to Step 26 26 Using the vacuum pump and check the EGR valve (if • Restrict shaft movement. Check for objects sticking the shaft, broken diaphragm or excessive carbon If a problem is found, repair as necessary. — Verify repair Go to Step 27 27 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 28 28 Replace the fuel filter. — Verify repair Go to Step 29 Step Action Value(s) Yes No When idling or part-throttle
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