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ENGINE DRIVEABILITY AND EMISSIONS 6E–205 8 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 is — Go to Step 10 Go to Step 9 9 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 14 10 Check for injector for the affected bank. — Go to Step 11 Refer to Injector Coil Test & Injector Balance Test Procedure 11 Check for fuel pressure. — Go to Step 15 Refer to Fuel System Diagnosis 12 Replace the TPS. — Verify repair — 13 Replace the MAP sensor. — Verify repair — 14 Replace the IAC valve. — Verify repair — 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 |