For 1990-2009 cars

### Description

The engine control module (ECM) learns the throttle position of the throttle body assembly to ensure the correct idle operation. Anytime the ECM or the throttle body assembly is replaced, the ECM must learn the throttle position. The engine idle may be unstable or a DTC may set if the throttle position is not learned.

### Conditions for Running the Throttle Learn Procedure

• | DTCs P0121, P0122, P0123, P0221, P0222, P0223, P0638, P2100, P2101, P2105, P2107, and P2119 are not set.

• | The engine speed is less than 40 RPM.

• | The vehicle speed is 0 km/h (0 mph).

• | The accelerator pedal position is less than 15 percent.

• | The ignition voltage is more than 10 volts.

• | The engine coolant temperature is between 5-85°C (41-185°F).

• | The intake air temperature is between 5-60°C (41-140°F).

### Throttle Learn Procedure

Important:

• | Ensure the above conditions are met before proceeding with this procedure.

• | Do not perform this procedure if a throttle position (TP) sensor or other throttle actuator control (TAC) system DTCs are set other than P2176. The ECM will not perform the throttle learn procedure with a DTC set.

1. Turn OFF the ignition for 30 seconds.
2. Turn ON the ignition, with the engine OFF for 60 seconds.
3. Turn OFF the ignition.
4. Turn ON the ignition, with the engine OFF.
5. Clear the DTCs with a scan tool.