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6E–154 ENGINE DRIVEABILITY AND EMISSIONS 9 1. Using the Tech 2, ignition “On” and engine “On”. 2. Monitor the “Manifold Absolute Pressure” in the data display. Does the Tech 2 indicate correct “Manifold Absolute — Go to Step 11 Go to Step 10 10 Remove the MAP sensor and check for the following • Objects blocking the air cleaner. • Objects blocking the MAP sensor. • Objects blocking the throttle valve. • Vacuum leaking at intake duct. • Vacuum leaking at throttle body. — Verify repair Go to Step 11 11 1. Using the Tech 2, ignition “On” and engine “On”. 2. Select the “Miscellaneous Test” and perform the “IAC Control” in the “IAC System”. 3. Operate the Tech 2 in accordance with procedure. Was the engine speed changed, when the IAC valve — Go to Step 13 Go to Step 12 12 Check for the following conditions. • Objects blocking the IAC valve. • Objects blocking the throttle valve. • Vacuum leaking at throttle body. — Verify repair Go to Step 13 13 Check for injector for the affected bank. — Go to Step 14 Refer to Injector Coil Test & Injector Balance Test Procedure 14 Check for fuel pressure. — Go to Step 15 Refer to Fuel System Diagnosis 15 Replace the O 2 sensor. Was the problem solved? — Verify repair Go to Step 16 16 Is the ECM programmed with the latest software — Verify repair Go to Step 17 17 Replace the ECM. — Verify repair — Step Action Value(s) Yes No |