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OBDII Driving Cycle

 
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1979 Chevrolet Camaro

PostPosted: Mon Jun 01, 2009 9:18 am    Post subject: OBDII Driving Cycle Reply with quote

General Motors Driving Cycle

A complete driving cycle should perform diagnostics on all systems. This is required in order to pass state emissions inspections. If you reset the check engine light the steps below should complete the ecm tests required to pass emission testing.

1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50C (122F) and within 6C (11F) 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 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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squeeezer
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1991 Chevrolet Camaro

PostPosted: Tue Jun 02, 2009 9:03 am    Post subject: Reply with quote

should add a sticky for readiness monitors
this is what you need online for emmisions
so dont clear codes before your inspections!!!!!!

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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Tue Jun 02, 2009 1:49 pm    Post subject: Reply with quote

The readiness monitors are:

Misfire (continuous)
Fuel Trim (continuous)
Comprehensive Components (continuous)
Catalyst (CAT)
Exhaust Gas Recirculation (EGR)
Evaporative (EVAP)
Oxygen (O2) Sensor
Secondary Air
Heated Catalyst
Air Conditioning (AC) System
O2 Sensor Heater

NOTE: Not all vehicles have these.

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squeeezer
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Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Tue Jun 02, 2009 2:13 pm    Post subject: Reply with quote

so only the top 3 (continuous) will come back or stay online after you clear a code
the rest have a list of criteria before they come on line

this comes into play when you made a repair then cleared a code went to emmisions test and failed because your rediness monitors were not on line

im glad this end of wisconsin has no emissions tests!!!! Very Happy

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