S70 T5 OBDII Monitors not ready for emissions

  • Thread starter Thread starter Pal
  • Start date Start date
P

Pal

I have a 99 S70 T5
It is inspection time and with the new OBDII emissions based test I can not
have
any check engine codes. About 6 months ago I had the Check engine light and
checked the code.

It was Fuel rich Bank 1. I replaced the Front O2 Sensor with an OEM
sensor - Bosch I believe.
About a month later the light came back on. I lived with it. But now I
need it to pass inspection.

I checked the codes and had the P0172 error. Same thing.
I started to check the vacuum lines and could not find any obvious problems.
I cleaned the wires on the MAF sensor.

Still the same error. I cleared the code and now have 3 monitors that are
not ready.
O2, Catalyst and Evap System. I think you can have no more than 2 monitors
not ready
for the OBDII emissions test. I ran it about 15 minutes this evening and
still they did not reset.
I will let it cool and run it again tomorrow.

Any ideas on what else to check? I read about a small vacuum elbow near the
power steering pump
but I could not find it on my T5.

Oh, when I start it cold it runs very ruff for about 15 seconds.

Thanks
Pal
 
Pal said:
I have a 99 S70 T5
It is inspection time and with the new OBDII emissions based test I can not
have
any check engine codes. About 6 months ago I had the Check engine light and
checked the code.

It was Fuel rich Bank 1. I replaced the Front O2 Sensor with an OEM
sensor - Bosch I believe.
About a month later the light came back on. I lived with it. But now I
need it to pass inspection.

I checked the codes and had the P0172 error. Same thing.
I started to check the vacuum lines and could not find any obvious problems.
I cleaned the wires on the MAF sensor.

Still the same error. I cleared the code and now have 3 monitors that are
not ready.
O2, Catalyst and Evap System. I think you can have no more than 2 monitors
not ready
for the OBDII emissions test. I ran it about 15 minutes this evening and
still they did not reset.
I will let it cool and run it again tomorrow.

Any ideas on what else to check? I read about a small vacuum elbow near the
power steering pump
but I could not find it on my T5.

Oh, when I start it cold it runs very ruff for about 15 seconds.
Click to expand...

You definately have a problem if its running rough at cold start. All the 5
cylinders should fire up almost instanltly and smoothly at cold start. It
sounds as its running rich- does the exhaust smell excessively of fuel? I'd
be looking at the coolant temp sensor to begin with...

Tim..
 
Pal said:
I have a 99 S70 T5
It is inspection time and with the new OBDII emissions based test I can not
have
any check engine codes. About 6 months ago I had the Check engine light and
checked the code.

It was Fuel rich Bank 1. I replaced the Front O2 Sensor with an OEM
sensor - Bosch I believe.
About a month later the light came back on. I lived with it. But now I
need it to pass inspection.

I checked the codes and had the P0172 error. Same thing.
I started to check the vacuum lines and could not find any obvious problems.
I cleaned the wires on the MAF sensor.

Still the same error. I cleared the code and now have 3 monitors that are
not ready.
O2, Catalyst and Evap System. I think you can have no more than 2 monitors
not ready
for the OBDII emissions test. I ran it about 15 minutes this evening and
still they did not reset.
I will let it cool and run it again tomorrow.

Any ideas on what else to check? I read about a small vacuum elbow near the
power steering pump
but I could not find it on my T5.

Oh, when I start it cold it runs very ruff for about 15 seconds.

Thanks
Pal
Click to expand...

Replacing the oxygen sensor is not the thing to do for P0172. The most
likely causes are vacuum leaks, fuel pressure or injector problems or a
bad air mass sensor.
Once the computer is "reset", (i.e. codes cleared, battery changed) it
has to go through a thorough check of all systems, (called a "trip")
twice for the readiness code to be set to "yes".

To set readiness codes, first turn off your A/C. A/C coming on will
cause tests to abort. Resetting the check engine light the "proper way"
with a Volvo tool will minimize the number of checks that need to be
done.

After the computer is reset, the flywheel adaptation must first be
done. This adaptation only occurs during coasting, the computer
analyses the tolerances in the cage or teeth on the flywheel so it knows
exactly when each cylinder is at top dead center. This is used for
misfire diagnostics. You need to do several decelerations from speed
(coasting). Without the special Volvo tool you have no way of knowing
when this has been completed, but 5 or 6 from 100 km/hr (60 mph) to 40
km/hr (25 mph) should be enough. A slight downhill will help.

The Trip

Obviously a road with little traffic and a good shoulder where you can
pull off easily would be preferable to complete this cycle. The times
given are minimum, allowing a little longer won't hurt.

Start engine, with the coolant temperature between 29 and 49 degrees
Celsius.
Make sure the A/C is off.
Gear selector in Drive
Drive at 1500-2000 rpm for 6 minutes
Idle engine in Drive for 70 seconds
(Fuel trim adaptive functions are being tested here)
Drive at 1500-2000 rpm for 6 minutes
Idle engine in Drive for 70 seconds
(Air pump functions are being tested here)
Accelerate gently to at least 45 mph, (75 km/hr), drive at 1800-2200 rpm
for 5 minutes
Idle engine in Drive for 70 seconds
(Evap leakage (gas cap) functions are being tested here)
Accelerate gently to at least 45 mph, (75 km/hr), drive at 1800-2200 rpm
for 4 minutes
Now the instruction sheet I have does not specify, but I believe you
should shift to neutral for the next step
Rev engine to 1500 rpm, hold for 10 sec, return to idle for 10 sec.
Repeat at least 3 more times.
(Idle air adaptation needs to come to idle at least 7 times to be set
to ready)

Now if everything worked out OK, you have just completed one trip. Turn
the car off, and allow the coolant temperature to drop between 29 and 49
degrees Celsius, and repeat. If you have the fancy Volvo scan tool you
can monitor this stuff, otherwise you're flying blind.

And while this may look like a very unfunny joke, I'm afraid it isn't.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
If this is a MA7 system (electronic throttle) you wont have a MAF- this
system uses a MAP sensor.
Gear selector in Drive
Click to expand...

What if its a manual Mike?

Tim..
 
Tim (Remove NOSPAM. said:
If this is a MA7 system (electronic throttle) you wont have a MAF- this
system uses a MAP sensor.


What if its a manual Mike?

Tim..
Click to expand...

Well, I didn't compose this, just copied it. You'll have to do this
part in neutral, I guess.
And ME7 injection still uses a MAF sensor.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
Mike F said:
Well, I didn't compose this, just copied it. You'll have to do this
part in neutral, I guess.
And ME7 injection still uses a MAF sensor.
Click to expand...

Ahh then my Haynes BOL is not telling the truth- they claim the ME7 uses a
MAP sensor.

Tim..
 
Tim (Remove NOSPAM. said:
Ahh then my Haynes BOL is not telling the truth- they claim the ME7 uses a
MAP sensor.

Tim..
Click to expand...


Bosch ME7 uses both a MAF and a MAP sensor. (And and intake air temp sensor
and a air pressure sensor, lots of scope for problems!)
 
OBD said:
Bosch ME7 uses both a MAF and a MAP sensor. (And and intake air temp sensor
and a air pressure sensor, lots of scope for problems!)
Click to expand...


Ahharrr! We were both right then! hehe

Tim..
 
You must log in or register to reply here.
Back
Top