We recommend reseting the ECU (clearing trouble codes) after emission repairs. This is standard repair procedure. Once the repair is performed, in this case replacement of the EGR valve and modulator, the EGR P0128 trouble code should be erased and your Toyota Camry be driven through a drive cycle. If the fault was repaired correctly the check engine light will not illuminate and no pending code (s) will be set; during the course of the drive cycle. We recommend using a scan tool to ensure all emission monitors are "ready" or "complete" after performing the drive cycle.
NOTE: While clearing your Toyota Camry's EGR valve/systems trouble code (P0128) you will also be erasing all of the emission monitors, including the EGR monitor. As you probably already know, emission monitors are internal self tests which your 2001 Toyota Camry conducts to ensure its emission systems are working properly.
The following is a Generic Drive Cycle which should set all the required Monitors and let your Toyota Camry pass the smog test.
Begin by: (Make sure you have between 1/4 and 3/4 fuel in the gas tank. The EVAP test will not run while your Toyota has a full tank of gas or the gas tank is near empty).
- Start the engine. Idle the engine in drive for two and a half minutes with the A/C and rear defroster on.
- Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle.
- Hold at a steady speed of 55 mph for three minutes.
- Decelerate (coast down) to 20 mph without braking.
- Accelerate back to 55 to 60 mph at ¾ throttle.
- Hold at a steady speed of 55 to 60 mph for five minutes.
- Decelerate (coast down) to a stop without braking.
If all other emissions systems are functioning properly, completing the drive cycle above should set (make ready) your Toyota Camry emission monitors required to pass the smog check. It will not hurt to perform the drive cycle 2 or 3 times before the smog inspection. Take caution when performing drive cycles on public roadways. Perform at your own risk.
