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GM DRIVE CYCLE FOR EMISSIONS TEST
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Author:  96 SSEi [ Sun May 08, 2016 1:14 pm ]
Post subject:  GM DRIVE CYCLE FOR EMISSIONS TEST
HI, ALL I had issues getting my 2000 SSEi to pass emissions in Canada - i/m not ready on many systems so I thought it would be helpful to start a post dedicated to this...........I found this:

General Motors Driving Cycle

A complete driving cycle should perform diagnostics on all systems. A complete driving cycle can be done in under fifteen minutes.

To perform an OBDII Driving cycle do the following:

Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and within 6°C (11°F) 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.

1- 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.

2- 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.

3- 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.

4- 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.

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

6- 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.

7- Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

any thoughts or additions?
Author:  ddalder [ Sun May 08, 2016 4:09 pm ]
Post subject:  Re: GM DRIVE CYCLE FOR EMISSIONS TEST
Were there any codes that had been set/cleared or repairs that were carried out prior to the test?
Author:  ddalder [ Sun May 08, 2016 4:51 pm ]
Post subject:  Re: GM DRIVE CYCLE FOR EMISSIONS TEST
This is what the GM service manual states (as it relates to my 2004 GXP). Basically, it should be pretty much the same for any OBD-II vehicle.

Inspection/Maintenance (I/M) System Check

Description
Several states require that a vehicle pass on-board diagnostic (OBD) system tests and the inspection/maintenance (I/M) emission inspection in order to renew license plates. This is accomplished by viewing the I/M System Status display on a scan tool. Using a scan tool, the technician can observe the I/M System Status in order to verify that the vehicle meets the criteria that comply with the local area requirements.

Conditions for Updating the I/M System Status
Each system monitor requires at least one, and sometimes several diagnostic tests. The result of each test is reported by a diagnostic trouble code (DTC). A system monitor is complete when either all of the DTCs comprising the monitor have Run and Passed, or when any one of the DTCs comprising the monitor has illuminated the malfunction indicator lamp (MIL). Once the system monitor is complete, the I/M System Status display will indicate YES in the Completed column.

For example, when the HO2S Heater Status indicates YES, either all of the oxygen sensor heater tests have passed or one of the tests has illuminated the MIL. If the vehicle has 4 heated oxygen sensors, either all four heater circuit tests have passed or one of the heater circuit tests has illuminated the MIL. The I/M System Status will indicate NO under the Completed column when any of the required tests for that system have not run. The following is a list of conditions that would set the I/M System Status indicator to NO:

• The vehicle is new from the factory and has not yet been driven through the necessary drive conditions to complete the tests.

• The battery has been disconnected or discharged below operating voltage.

• The control module power or ground has been interrupted.

• The control module has been reprogrammed.

• The control module DTCs have been cleared.

Monitored Emission Control Systems
The OBD II System monitors all emission control systems that are on-board. Not all vehicles have a full complement of emission control systems. For example, a vehicle may not be equipped with secondary air injection (AIR) or exhaust gas recirculation (EGR). The OBD II regulations require monitoring of the following:

• The air conditioning (A/C) system

• The catalytic converter efficiency

• Comprehensive component monitoring--Emission related inputs and outputs

• The evaporative emissions (EVAP) system

• The exhaust gas recirculation (EGR) system

• The fuel delivery system

• Heated catalyst monitoring

• Misfire monitoring

• The oxygen sensor system (O2S or HO2S)

• The oxygen sensor heater system (HO2S heater)

• The AIR system
Author:  ddalder [ Sun May 08, 2016 6:10 pm ]
Post subject:  Re: GM DRIVE CYCLE FOR EMISSIONS TEST
From my GXP, using my Tech2, this is what the screen shot looks like...

Image
Author:  96 SSEi [ Sun May 08, 2016 6:28 pm ]
Post subject:  Re: GM DRIVE CYCLE FOR EMISSIONS TEST
ddalder wrote:
Were there any codes that had been set/cleared or repairs that were carried out prior to the test?


yes, I had 449: that solenoid by drivers rear wheel but 4 systems were not ready, cat, egr, o2 and I think ho2
Author:  ddalder [ Sun May 08, 2016 6:35 pm ]
Post subject:  Re: GM DRIVE CYCLE FOR EMISSIONS TEST
I'm not the best person to respond to that, but my best guess is that a fault in one system can also result in other systems working out of spec resulting in diagnostics being repeated to change their status back to ready.
Author:  CMNTMXR57 [ Sun May 08, 2016 9:34 pm ]
Post subject:  Re: GM DRIVE CYCLE FOR EMISSIONS TEST
1) Resetting the system (I.E. Idle relearn) and doing this ISN'T "fixing" the issue. If there is truly a fault, it is just a matter of time before it comes back again. So resetting it, then doing the drive cycle as close to the methods linked doesn't mean it will fix it. GM I/M system checks, when they do fail, will run still each drive cycle until they pass.

2) Many states/municipalities/etc allow for 1 or 2 of your I/M (readiness monitors) NOT to have to respond and pass depending on model year. If they all do and report as complete and pass, great. But not every drive cycle, does the PCM run EVERY test on EVERY readiness monitor. In Darcy's picture above, all show completed and passed (with the YES), because 1) he hasn't reset his PCM and 2) it's going on the last time the test ran and passed.

Same thing here on mine. All reported as Completed/passed because I haven't reset them and over time they all have ran;
Image

This is the State of Illinois's langauge regarding I/M system status;
Quote:
Remember, vehicles are rejected when more than two non-continuous readiness monitors are “not ready” for 1996 to 2000 model year vehicles, or when more than one non-continuous readiness monitor is “not ready” for 2001 and newer model year vehicles. Additionally, the catalyst monitor must be “ready” at the time of any re-test after a vehicle failed an initial test for any catalyst code.
Author:  ddalder [ Sun May 08, 2016 10:25 pm ]
Post subject:  Re: GM DRIVE CYCLE FOR EMISSIONS TEST
Exactly what Lane said.

A fault totally negates that entire process and needs to be fixed. Since reconnecting my battery after taking it out of storage a couple of weeks back, I've definitely driven in all the various conditions that cause the tests to occur. I also have absolutely no problems with the car.

In Alberta we don't have emissions testing. We do have a very intense inspection for any vehicle imported from out of country or comes from another province. If the inspections fails, it must be repaired within a specified time frame or exported back out of the province. This doesn't address the whole problem, but the government wanted to ensure people weren't bringing in pieces of junk from other areas. They are so strict, I had to have a brand new Alberta purchased emergency vehicle inspected (for some criteria) after bringing it in from a second stage upfitter in Ohio.
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