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Master
1,050 Answers
- Posted on Mar 21, 2009
Re: pcm not ready, NYS inspection, 1997 Saturn SL-1
Performing a GM OBDII Driving cycle:
- Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 122°F (50°C) and within 11°F (6°C) of the ambient air temperature at startup.
Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
- Idle. The
engine must be run for two and a half minutes with the air conditioner
on and rear defroster on. The more electrical load you can apply the
better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire, and - if closed loop is achieved- Fuel Trim.
- Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 55mph (88km/hr) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
- Hold Steady Speed.
Hold a steady speed of 55mph (88km/hr) for 3 minutes. During this time
the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim
diagnostics will be performed.
- Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch.
It is important to let the vehicle coast along gradually slowing down
to 20 mph (32km/hr). During this time the EGR, Purge and Fuel Trim
diagnostics will be performed.
- Accelerate. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.
- Hold Steady Speed.
Hold a steady speed of 55mph (88km/hr) for five minutes. During this
time, in addition to the diagnostics performed in step 4, the catalyst
monitor diagnostics will be performed. If the catalyst is marginal or
the battery has been disconnected, it may take 5 complete driving
cycles to determine the state of the catalyst.
- Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.
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