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Old 02-15-2010, 01:50 PM   #1
hdnick01
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Default drive cycle

how many miles does it take for a 2001 saturn SC1 take to go through the drive cycle?

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Old 02-15-2010, 03:23 PM   #2
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1998 SC2
Default Re: drive cycle

30 miles is plenty. If your temperature gauge does not reach 3/8 then the monitors will never reset. Also the fuel level has to be between 255 to 80% for the evap monitor to run.

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Old 02-15-2010, 07:19 PM   #3
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Default Re: drive cycle

do you mean that the fuel tank has to be close to full. and my temp gauge never gets above 1/4. it throws good heat, but is never above the "C". you know what to do about it?

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Old 02-15-2010, 08:08 PM   #4
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Default Re: drive cycle

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Originally Posted by hdnick01 View Post
how many miles does it take for a 2001 saturn SC1 take to go through the drive cycle?
OBD-II Driving Cycle
If you have a 96 or newer vehicle you have the OBD-II diagnostic system. This system is constantly monitoring the sensors and solenoids on the engine. If you have replaced the battery, disconnected the battery or cleared the codes after making a repair you will need to do what is called a "Driving Cycle". This will perform a diagnostic on all the systems the computer monitors. This cycle can be done in under fifteen minutes.

To perform an OBDII Driving cycle do the following:

1. Cold Start
In order to be classified as a cold start the engine coolant temperature must be below 50ºC (122ºF) and within 6ºC (11ºF) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.

2. Idle
The engine must be run for two and a half minutes with the air conditioner on maximum 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.

3. Accelerate
Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.

4. Hold Steady Speed
Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.

5. 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 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.

6. Accelerate
Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.

7. Hold Steady Speed
Hold a steady speed of 88km/hr (55mph) 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.

8. 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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Old 02-15-2010, 08:17 PM   #5
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Default Re: drive cycle

If only it were that simple

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Old 02-15-2010, 08:18 PM   #6
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Default Re: drive cycle

> is never above the "C". you know what to do about it

-start with installing a new thermostat ...

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Old 02-15-2010, 09:08 PM   #7
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1998 SC2
Default Re: drive cycle

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Originally Posted by hdnick01 View Post
do you mean that the fuel tank has to be close to full. and my temp gauge never gets above 1/4. it throws good heat, but is never above the "C". you know what to do about it?
To fix the cold problem you need to replace the ECTS and probably the thermostat. Use a STANT 14279 thermostat and buy a separate thermostat o-ring also. Do not use anything but teh STANT 14279 as its OEM for your year. Take the forum jump to the How-To Library and in the first couple of sticky posts you will find the ECTS info and the links to the richpin DIY videos. If the car never reaches proper operating temperature the monitors will not reset. The gas has to be between 25% and 80% so a half tank will do just fine. This will let the evap test run.

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Old 02-16-2010, 07:45 AM   #8
DonP
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1995 SL2
Default Re: drive cycle

As noted above you may have a stuck-open t-stat, a bad ECTS, or both. Either will likely cause the drive cycle not to be completed.

A bad ECTS will result in the ECM computer not gettng correct engine temperature information. The typical failure mode is that it will read too low a temperature. On '96 and newer models the temp gauge readings will also be unreliable.

A stuck open t-stat will circulate coolant through the radiator at all times keeping the coolant temprature low as long as air is flowing through the radiator (i.e., when the car is moving or the A/C is on). This too can prevent completionof the drive cycle due to too cool engine coolant.

If the car is allowed to idle for a long time (not moving with A/C off) and the temp gauge slowly rises above 1/2 scale, the ECTS could be OK and the t-stat may be stuck open. However, changing to the new type ECTS is recommended in any case, if not already done done so.

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