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Procedure: The ECM controls idle rpm with the IAC (idle air control) valve. sensors are replaced) it is a good idea to perform the idle learn procedure. 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. 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. The ECM then resets the pintle to the correct position. Over 20 years of bumper to bumper GM experience. Engine oil life interval may be programmed or reset by using a scan tool or the DIC. ... ASE Master Technician, L1, Master GM Technician. Whenever the ECM loses battery power (which clears the stored IAC position) or significant changes to the system (e.g. This should clear the ECM of all trouble codes. … 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. With the new IAC installed the truck is idling erratically. Step 4: Inspect the IAC valve. Ignition ON, engine OFF, perform the Idle Learn or Idle Learn Reset in Configuration/Reset or Module Setup. Now, go remove the connector from the IAC. When your vehicle has properly warmed up then you want to turn your … In this instance, you want to reset your engine control modules manually through the fuse box. Many car makers including GM started installing fly by wire … More throttle valve opening equals lower IAC counts. That's a good … 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. You are now … NOTE: Scan tool may reset engine oil life interval index in … Reconnect the battery and drive the car for 20 minutes to allow the ECM to “relearn.” -Allan Reinike/Tom Keliher And for more GM vehicles projects,check here:GM vehicle repair cases. Turn on the ignition, but don't start the engine. Step 3: Remove the IAC valve from the vehicle. If not, the adjustments may be tailored by adjusting the minimum air rate screw. Wait 30 seconds. Resetting your cars ECU can also be useful when modifications are done on the vehicle. To increase idle rpm the ECM moves the IAC valve out allowing more air to pass by the throttle plate. Engine idling, verify the scan tool Throttle Body Idle Airflow Compensation value is equal 0% and the engine is … Inspect the valve and the mounting location for carbon build-up, rust or … Locate the IAC valve electrical connector and unplug the IAC valve. Less throttle opening equals higher IAC counts. Step 2: Disconnect IAC valve. With engine stabilized and in closed loop, the IAC motor values should be between nine to 12 counts. That should do it. The ECM uses non-volatile memory to keep track of the IAC position when the engine and ECM are turned off. 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. The IAC valve pintle is reset by turning the ignition ON for ten seconds and then OFF. Start engine. 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. Each car has a unique IAC value that takes into account the condition of the sensors, air and vacuum … The idle rpm is programmed into the PROM. IAC Reset Procedure with a Scan Tool: Ken Mosher. Use the procedure detailed in the vehicle service manual to remove the IAC valve. Insert the clip ends into the ALDL in the 'A' and 'B' pins. 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