Tacoma 2.4L Drive Cycle

<m0nk3y_69@hotmail.com> wrote in message
news:1109437516.253937.267570@z14g2000cwz.googlegroups.com...[color=blue]
> What is the drive cycle to set the readiness flags for the OBDII
> system?
>
> I failed emissions since they changed from a tailpipe test to an OBDII
> test. I replaced the O2 sensor almost a month ago, but the catalyst
> keeps reporting that it isn't ready to test yet... I want to run a
> standard drive cycle to fulfill the readiness monitor... HELP?!?
>[/color]
I don't have a specific answer for your question, however, in general, if
the engine reaches normal operating temperature, your system should be ready
for testing. Conventional wisdom used to be that it was good to take the
vehicle for a good hard highway drive before going in for a test; IMO, that
is not really necessary any more.

When you replaced the O2 sensor, did you use OEM or aftermarket parts?
Assuming you replaced the O2 sensor due to a check engine light (malfunction
indicator light), did you clear the trouble code from the ECU's memory? If
you did not clear the code, the vehicle will probably fail an emissions
test.


--
Ray O
correct the return address punctuation to reply

What is the drive cycle to set the readiness flags for the OBDII
system?

I failed emissions since they changed from a tailpipe test to an OBDII
test. I replaced the O2 sensor almost a month ago, but the catalyst
keeps reporting that it isn't ready to test yet... I want to run a
standard drive cycle to fulfill the readiness monitor... HELP?!?

<m0nk3y_69@hotmail.com> wrote in message
news:1109437516.253937.267570@z14g2000cwz.googlegroups.com...[color=blue]
> What is the drive cycle to set the readiness flags for the OBDII
> system?
>
> I failed emissions since they changed from a tailpipe test to an OBDII
> test. I replaced the O2 sensor almost a month ago, but the catalyst
> keeps reporting that it isn't ready to test yet... I want to run a
> standard drive cycle to fulfill the readiness monitor... HELP?!?
>[/color]
I don't have a specific answer for your question, however, in general, if
the engine reaches normal operating temperature, your system should be ready
for testing. Conventional wisdom used to be that it was good to take the
vehicle for a good hard highway drive before going in for a test; IMO, that
is not really necessary any more.

When you replaced the O2 sensor, did you use OEM or aftermarket parts?
Assuming you replaced the O2 sensor due to a check engine light (malfunction
indicator light), did you clear the trouble code from the ECU's memory? If
you did not clear the code, the vehicle will probably fail an emissions
test.


--
Ray O
correct the return address punctuation to reply

Yes, I've driven from a cold start on the highway for a long trip.
I've driven all over the place. I did a search for "obdii drive cycle"
and found some instructions that appeared to be the formula I needed to
follow, but the Catalyst readiness flag will not set. My state has
mandated this system, but does not provide the necessary information to
repair your own vehicle.

The O2 sensor I used was genuine Toyota. I used an AutoXray tool to
reset the MIL and clear the trouble codes.

The state has pretty much mandated a dealer extortion scenario.
They've set a list of authorized repair centers. They've set the
exemption to spending $660 at one of these authorized repairers. I am
fairly certain that the actual emissions from the vehicle are low
enough to pass a tail-pipe test. I have plenty of power and I average
27mpg (+) for around town driving.

I am curious to know if Toyota has varied the standard drive cycle for
their OBDII implementation.

Thanks for the response!

In my search for an answer, I stumbled upon a document about the Dodge
Neon, and how the catalyst cycle needs to be completed in 4th gear.

I tried that approach. I reset the ECU and followed the generic OBDII
drive cycle that I found in a google search. I ran the final segment
of the cycle in 4th gear, and when I finished the cycle, all readiness
tests were complete.

Who the heck runs their vehicle at 60mph in 4th gear for 8+ minutes?

People that drive 2.4L Tacoma up a steep grade and still want to
maintain the 65 MPH speed limit, I guess ;)


mike hunt



[email]m0nk3y_69@hotmail.com[/email] wrote:[color=blue]
>
> In my search for an answer, I stumbled upon a document about the Dodge
> Neon, and how the catalyst cycle needs to be completed in 4th gear.
>
> I tried that approach. I reset the ECU and followed the generic OBDII
> drive cycle that I found in a google search. I ran the final segment
> of the cycle in 4th gear, and when I finished the cycle, all readiness
> tests were complete.
>
> Who the heck runs their vehicle at 60mph in 4th gear for 8+ minutes?[/color]

I have never had an issue with the truck losing power on hills in 5th
gear. Especially once I'm going 60-65. If I get slowed down to 45-50
or so, then I downshift. But to maintain 60-65, 5th gear has never let
me down.

Of course, Connecticut is relatively flat...

I have never had an issue with the truck losing power on hills in 5th
gear. Especially once I'm going 60-65. If I get slowed down to 45-50
or so, then I downshift. But to maintain 60-65, 5th gear has never let
me down.

Of course, Connecticut is relatively flat...

On Sat, 19 Mar 2005 19:12:07 -0800, m0nk3y_69 wrote:
[color=blue]
> I have never had an issue with the truck losing power on hills in 5th
> gear. Especially once I'm going 60-65. If I get slowed down to 45-50
> or so, then I downshift. But to maintain 60-65, 5th gear has never let
> me down.
>
> Of course, Connecticut is relatively flat...[/color]

And most residents are Flat-Headed!

(ONLY KIDDING!!!! I live in New Britsky for 2 years, and Whorehouse Point
for 4, and worked at Hamilton Standard for nine! ;)