The ECM then resets the pintle to the correct position. Step 2: Disconnect IAC valve. That's a good … Now, go remove the connector from the IAC. Less throttle opening equals higher IAC counts. To increase idle rpm the ECM moves the IAC valve out allowing more air to pass by the throttle plate. With the new IAC installed the truck is idling erratically. This should clear the ECM of all trouble codes. The idle rpm is programmed into the PROM. IAC Reset Procedure with a Scan Tool: Ken Mosher. Over 20 years of bumper to bumper GM experience. To decrease rpm it moves the IAC valve in to reduce air … The Idle Learn Procedure When you're having problems, the first thing worth trying is the idle lean procedure. The fuse box is located on the passenger side next to the battery. GM throttle body relearn procedure How to do a GM throttle body relearn procedure. Engine idling, verify the scan tool Throttle Body Idle Airflow Compensation value is equal 0% and the engine is … Turn on the ignition, but don't start the engine. Start engine. ... ASE Master Technician, L1, Master GM Technician. Many car makers including GM started installing fly by wire … Inspect the valve and the mounting location for carbon build-up, rust or … Use the procedure detailed in the vehicle service manual to remove the IAC valve. More throttle valve opening equals lower IAC counts. That should do it. 04-20-10 09:10 AM - Post# 1901788 I replaced the IAC to resolve a low idle problem I am having with my 1992 C1500 with a 350 TBI. Procedure: The ECM controls idle rpm with the IAC (idle air control) valve. Engine oil life interval may be programmed or reset by using a scan tool or the DIC. … Whenever the ECM loses battery power (which clears the stored IAC position) or significant changes to the system (e.g. Insert the clip ends into the ALDL in the 'A' and 'B' pins. The IAC valve pintle is reset by turning the ignition ON for ten seconds and then OFF. Step 4: Inspect the IAC valve. When your vehicle has properly warmed up then you want to turn your … Ignition ON, engine OFF, perform the Idle Learn or Idle Learn Reset in Configuration/Reset or Module Setup. If not, the adjustments may be tailored by adjusting the minimum air rate screw. If you’ve replaced your GM electronic throttle body or you’ve disconnected the battery, you must do a GM throttle body relearn to establish a new baseline idle. Idle Air Control Tools needed: Torx bit # T-20 Paper Clip Small Punch Take the paper clip and open it up and form it into a big "U" shape. You are now … The ECM uses non-volatile memory to keep track of the IAC position when the engine and ECM are turned off. sensors are replaced) it is a good idea to perform the idle learn procedure. In this instance, you want to reset your engine control modules manually through the fuse box. With engine stabilized and in closed loop, the IAC motor values should be between nine to 12 counts. If you set a Check Engine light by having the IAC disconnected, ensure the engine is off, disconnect the negative battery terminal and wait 5 minutes. Wait 30 seconds. General Motors Corp. - Computer Relearn Procedures All Models; Cars ... Procedure must be performed if any of the following have been done or exist: ... reprogrammed or reset. NOTE: Scan tool may reset engine oil life interval index in … Step 3: Remove the IAC valve from the vehicle. Locate the IAC valve electrical connector and unplug the IAC valve. Resetting your cars ECU can also be useful when modifications are done on the vehicle. Each car has a unique IAC value that takes into account the condition of the sensors, air and vacuum … And for more GM vehicles projects,check here:GM vehicle repair cases. 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