99 SL2 Codes. I Need Help

Chris S · 12-17-2003, 11:59 PM

Okay here is the problem. I take the car to get inspected and it doesnt pass. The guy gives me a computer printout of the codes it threw. They are p0113, p0133, and p0410. Now I know what they mean but here is what I am thinking.

p0113-IAT Sensor Circuit High Input. - Change IAT sensor?

p0133-Upstream Heated O2 sensor Circuit (Bank 1, Sensor 1) - Change front O2 sensor?

p0410-Problem with the Air Pump - Dont know what this is or what to do about it. The only thing I know about the air pump is that it is located on the exhaust manifold. - What should I do about this? I dont really want to bypass it or take it out of the loop.

Thanks in advance for any informationa that you can offer. I am glad I stumbled upon this forum as it will help me deal with my saturn issues a little easier.

Chris

sc2_ct · 12-18-2003, 12:16 AM

It sounds like the IAT sensor has failed which is throwing off your air/fuel mixture and causing it to run rich. Try replacing the IAT sensor (about $10-15 at the dealership) and the other codes might go away. The o2 sensor might need a good cleaning, in which case just scrub it down with some gasoline and a tooth-brush. As for the air pump, it is conceivable that this is clogged and needs to get replaced.

**Ssicarman** · 12-18-2003, 02:21 AM

P0113 will set if the IAT has ever been unplugged when the key has been turned on. I have never had to replace an IAT sensor.

P0133
Most likely is a bad O2 sensor. Check out the following.

DTC P0133, P1133, or P1134
Circuit Description

After achieving closed loop fuel control, a commanded air fuel ratio of 14.7:1, RPM between 1,500-3,200, and air flow between 7-25 grams per second, the PCM will continuously monitor the front oxygen sensor signal for 100 seconds. During this time, the PCM counts the number of rich to lean and lean to rich switches. To be considered a switch, the voltage must go below 300 mv and above 600 mv. The PCM also keeps track of the time it takes to make the switch. The number of switches along with the time to achieve these switches are used to calculate the average response time to perform each switch. Also this information is used to calculate if the proper ratio of the switches is correct. The 3 diagnostic trouble codes listed below are used to identify different types of faults that can occur with oxygen sensors.

Conditions for Setting the DTC
DTC P0133
This DTC is set if the average response time of the switches from the sensor is too slow after the 100 second test is performed. If the lean to rich time is greater than 125 ms or the rich to lean time is greater than 156 ms, this code will set.

DTC P1133
If less than 10 switches take place during the test, this code will set.

DTC P1134
If the transition ratio of the sensor is greater than 2.8 or less than 0.6, this DTC will set.

Diagnostic Aids
Repair Procedure
The oxygen sensor wiring and connections should be checked if any of these DTCs are set because corrosion or loose connections could cause these DTCs to set.
The most likely cause of setting any of these DTCs is contamination. This contamination could be caused by fuel, improper use of RTV sealant, engine oil, or coolant contamination.
The source of contamination should be identified and corrected before replacing the sensor.

P0410

See the following and wonder if perhaps a bad front O2 sensor may help set that code. Check all the vacuum lines and wiring for the air pump as well.

DTC P0410 determines if the air pump system is operating properly. During air pump operation, the PCM monitors the oxygen sensor output. The additional air pumped into the exhaust manifold causes the oxygen sensor to indicate a lean condition in a properly operating system. If the oxygen sensor does not indicate a lean condition for a fixed amount of time, it will fail the DTC P0410 diagnostic test.

Conditions for Setting the DTC
DTC P0410 will set when:

The oxygen sensor does not indicate a lean condition during air pump operation.
No MAP, TP, EGR, O2S, misfire, or fuel trip DTCs are set.
The diagnostic for DTC P0410 will only run when the air pump is ON. If the air pump runs only for a short period of time, the DTC P0410 diagnostic test may not run.

Diagnostic Aids
Us the scan tool air pump Special Test to verify if a problem exists. The Special Test turns ON the air pump for 30 seconds and forces the DTC P0410 diagnostic test to run.

Once you have checked things out I would suggest getting the codes erased and see if they come back, it may take a few drives to pop them but if they do come back then you have a better idea of what to go after.
Any of these codes should have turned the SES light on.

Chris S · 12-18-2003, 02:52 AM

Well I did just change the trans fluid and had to unhook the wires to the airbox so do you think that could had tripped the IAT Sensor? And I guess I will change the upper O2 sensor and see what that does.

Thanks,

Chris

sc2_ct · 12-18-2003, 06:42 PM

I know right now I am having a P0133 and that my scan tool is reading 0F and never changing, but since I've changed the sensor I am assuming that there is a problem with either the connector or with the wiring. If you have a scan tool that supports it, check the temperature return from the sensor.

**Ssicarman** · 12-19-2003, 03:51 AM

Quote:

Originally Posted by Chris S

Well I did just change the trans fluid and had to unhook the wires to the airbox so do you think that could had tripped the IAT Sensor? And I guess I will change the upper O2 sensor and see what that does.

Thanks,

Chris

If you turned the key on with the sensor unplugged or if it is still unplugged (double check it) then yes.

wolfman · 12-19-2003, 04:22 AM

I will only add that you abosolutely CANNOT CLEAN AN O2 SENSOR! Any attempt to do so (esp with gasoline!) WILL RUIN IT.

I believe the airpump is also controlled by the PCM using IAT data, and it would also affect the air/fuel mixture to the engine, and when the PCM "thinks" it should see valid O2 sensor data... I'd say all things considered the obvious is probably correct...RECONNECT the IAT SENSOR.