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Bough new battery and then went to ga emission station.everything passed except readiness.said evaporative system not ready. Truck has 157k mi. i have never tuned. What does it need to pass

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If the evaporative system not ready then something is disconnected there, or the canister is broken or needs to be replaced, for instance.

Also, the tubes from the gas tank to the canister may be bad.

You could tune it up as a matter of doing routine maintenance,
but I don't think this is the problem they came up with.


Posted on Jul 10, 2010

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Posted on Jan 02, 2017

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I have a 2002 honda accord 4 cyl. that is reading on obd2 7 monitors ready ,1 inc egr , can anyone ell me what this means if it is not ready.


Whenever power is completely removed from a vehicle (disconnect the battery), active trouble codes are erased and all system monitors are reset. This is primarily to prevent 'turning off' the check engine light just before emissions inspection. Most states require that all monitors (or a specific number of them) be in a 'ready' status.
For the monitors to 'pass' checks and attain a 'ready' status, specific conditions must be met, usually involving 'drive cycles'. Some system monitors will reset very quickly - one drive cycle or less. Some take longer - more drive cycles or other conditions (usually the evaporative emission cycle requires fuel be between 1/4 and 3/4 of a tank of fuel).
If your car recently had the battery disconnected or replaced, you may have to drive it a few more times to get all monitors into a 'ready' status. If the EGR (exhaust gas recirculation) monitor does not reset, check with a dealer or a good garage on what parameters must be met to reset this monitor.

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2002 Hyundai Elantra that says my on board computer is not ready to be tested. Emission results are: readiness- fail, monitor comprehensive- not ready, monitor EVAP not ready,monitor O2 not ready.


Did you recently clear the trouble codes or disconnect the battery? Once all codes are cleared, the computer will not display systems 'ready' until they go through an evaluation cycle. Some of the systems require a certain number of drive cycles before they will display 'ready'. A drive cycle is usually starting the engine from a cold start (based on coolant temperature) and driving until certain conditions are met. I don't know what the requirements are for your car, but my 2003 pickup truck requires more than 10 drive cycles before it will make the O2 sensors and evaporative emissions 'ready'. Most states only require that a certain number of systems are showing 'ready' to pass emissions certification.

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2001 chevrolet tahoe secondary air system not working cant pass smog all I did was replace battery before getting it smog


Disconnecting the battery resets the PCM - engine computer ,an the emission monitors . A drive cycle has to be done to get the monitors to run an hopefully set. That's all you need to do is drive it for few days of different driving conditions - city , highway ,from cold start . google GM drive cycle . OBD Monitor Not Ready

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Cant pass emissions,i need at least one of the not ready status to become ready status out of the oxygen senson, evaporative system, catalyst


drive it. I am betting you have recently "cleared" codes which also clears readiness monitors in an attempt to better control people cheating the system. After enough drive cycles are reached the monitors will pass if nothing is wrong and turn to ready. If the problem that the codes implicated where not fixed than the check engine light will again come back on and you will again fail your attempt to pass emissions.

Drive it for a week or so and see what happens.

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1 Answer

1997 Nissan Truck didn't pass emission test, readiness monitor not ready


that usually means that someone either disconnected the battery or the computer was reset. You need to drive the vehicle for about at least 20 minutes at road speed so the computer can scan all modules.

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Engine Check light


Take it to autozone or another place like it and have them read the codes and tell us what they are.

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Not enough data in computer for emissions testing


Has the battery been disconnected, or has it gone dead? Every time the battery is disconnected, all trouble codes are cleared, the check engine light is turned off, and all system monitors are reset. For the monitors to get back to a 'ready' status, the vehicle needs to go through one or more (sometimes quite a few) drive cycles.
When you go to the emission station, they check for codes, AND also check to see how many of your monitors are in a 'ready' status. (This keeps people from disconnecting the battery, and thus clearing any trouble codes, in order to pass emission tests).
If you have not disconnected your battery for a while, but the monitors are still not showing 'ready', you need to have a qualified shop check out your computer and other electronic systems.

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1 Answer

I bought a 99 Voyager this week and it failed emmissions because the battery had been removed for a peroid of time and they said I needed to drive it for a while and bring it back. How many miles do I need...


What does "not ready" mean?

A service technician will turn off the dashboard "check engine" light after most repairs. This resets the vehicle's emission system components to "not ready". The status remains "not ready" until the vehicle's computer has had adequate time to review the repaired component. This happens after the vehicle is driven for a period of time established by the manufacturer.

If the vehicle's emissions system status is "not ready" when it is presented at the E-Check station during the initial test cycle, a tailpipe emissions test may be conducted. If the vehicle is transferred to another test type, the vehicle must remain on the different test track until the vehicle passes the emissions test or receives a waiver. For example, if the vehicle undergoes an OBD II test and fails, it cannot be downgraded to a tailpipe test on a re-test; the vehicle must pass the OBD II test.

For initial and subsequent tests, if a dashboard light is on when the vehicle is presented at the E-Check station, the vehicle will fail the test.


How can the vehicle status be made ready?

When a vehicle is driven through its normal drive cycle, the computer reviews the emission control
system and if the vehicle was properly repaired, the system resets itself to ready. A normal drive
cycle includes operation at both cruising speeds and in stop-and-go traffic for up to a couple
weeks. This process should be followed before bringing the vehicle in to be tested.

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1 Answer

Can't pass emissions inspection


TRY DISCONNECTING THE BATTERY CABLE SO THE PCM (COMPUTER) RESETS TO ORIGINAL DEFAULT VALUES. HOPE THIS WORKS FOR YOU. GOOD LUCK

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