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Catalyst moniotor:

Pre-req: no codes present, IAT between -4 and 176 deg f; ECT is avove 75 deg f; barometric pressure above 72kPa, STFT between -20% and 20 %

-Idle vehicle 5 minutes until it is in closed loop

-drive 5 min at steady speed above 50 mph

-idle 2 min in drive (auto) or neutral (manual)

*very stable idle is required to pass this monitor

EGR Monitor:

Pre-req: no codes present, ECT is avove 75 deg f; barometric pressure above 72kPa

1. Idle vehicle 5 minutes until it is in closed loop

2. Accelerate and drive for 1 min at steady speed above 50 mph

3. coast vehicle down to 20 mph (vehicle in drive or w/ clutch engaged, brake off)

4. repeat steps 2 and 3 four times

* the GM egr runs during the deceleration portion of the drive trace

Evaporative Monitor:

Pre-req: no codes present, IAT & ECT between 45 and 85 deg f: barometric pressure above 75 kPa, fuel tank level between 26 and 74 %; TPS between 9& 35 %; evap solenoid is at 50% pwm within 65 sec of engine run time

-Idle vehicle 5 minutes until it is in closed loop

-drive 5 min at steady speed between 30 and 40 mph

-stop and idle 2 min

O2 Sensor Monitor:

Pre-req: no codes present, IAT above 32 deg f; ECT is avove 167 deg f

-Idle vehicle 5 minutes until it is in closed loop

-drive 3 min at steady speed above 50 mph

-drive 2 min at steady 40 mph

-drive 2 min at steady 50 mph

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