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6E–348 4JH1 ENGINE DRIVEABILITY AND EMISSIONS 19 Substitute a known good CKP sensor and recheck. — Go to Step 20 Go to Step 21 20 Replace the CKP sensor. — Verify repair — 21 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” Are the large gap or unstable parameter displayed — Go to Step 23 Go to Step 22 22 Check the exhaust system for a possible restriction. • Damaged or collapsed pipes or catalytic converter. • Internal muffler failure. — Verify repair Go to Step 23 23 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 24 24 Replace the fuel filter. — Verify repair Go to Step 25 Step Action Value(s) Yes No When idling or part-throttle When accelerated
High Desired Low Time Actual High Low Desired Actual Time |