[ArmAir1]

I'm looking for some assistance from anyone here from anyone who is familiar with reading data logging / O2 sensor graphs. I'm trying to get all the little bugs worked out of my '07 CC.

History: Back before I replaced my transmission I was getting an occasional CEL for catalyst inefficiency (P0430- Powertrain). I would clear the code and it would usually be good for a couple weeks or so. I have not seen the CEL since I replaced the trans but performance has seemed to be off a bit (I had been babying it for quite some time with the failing trans so would not have noticed the decreased performance). Of course now that the trans is up to par it been throttle down everywhere I go! :eveilgrin Idles good, runs good, no major issues just seems like its missing something. Note: I'm running shorty headers with the OE cats (primary and secondary)

So I've been monitoring/data logging with my Torq app and there seems to be some irregularities with the O2 sensor readings. Bank 2 sensors 1 and 2 seem to jump around alot. Both sensors on bank 1 seem to be much more steady. I know sensor 1 is the engine management sensor and sensor 2 is the emissions monitoring sensor.

I had gotten this fault with Torque Scan (although the last check after ECU reset it is was not there):
TID:$04 CID:$02
- High sensor Voltage for switch time calculation
Min: 50
Test result value: 36
FAIL

My theory: Bank 2 sensor 1 is faulty. This is causing sensor 2 to also read erratically. Possibly also causing the catalyst inefficiency CEL. Thoughts/input/suggestions?

 

[ArmAir1]

Here is some data. I will post some screenshots of the O2 sensor readings shortly.

Mode $06 report generated by Torque for Android
================================================

Vehicle VIN: Not present
Vehicle Manufacturer: Unknown
Vehicle Calibration ID: Not present

Unit and scaling information are not supplied with the data from the ECU for this type of vehicle. Consulting the manufacturers service book for this information is recommended.

Test report:
------------------
TID:$01 CID:$01
- Rich to Lean sensor threshold voltage(constant)
Min: 12
Test result value: 23
PASS
----
TID:$02 CID:$01
- Lean to Rich sensor threshold voltage(constant)
Min: 0
Test result value: 255
PASS
----
TID:$03 CID:$02
- Low sensor Voltage for switch time calculation
Min: 12
Test result value: 38
PASS
----
TID:$04 CID:$02
- High sensor Voltage for switch time calculation
Min: 50
Test result value: 36
FAIL
----
TID:$05 CID:$03
- Rich to Lean sensor switch time(calculated)
Max: 127
Test result value: 72
PASS
----
TID:$06 CID:$03
- Lean to Rich sensor switch time(calculated)
Min: 1
Test result value: 2
PASS
----
TID:$07 CID:$03
- Minimum sensor Voltage for test cycle(calculated)
Max: 33
Test result value: 18
PASS
----
TID:$19 CID:$06
-
Min: 6
Test result value: 6
PASS
----
TID:$1a CID:$06
-
Min: 58
Test result value: 58
PASS
----
TID:$1b CID:$06
-
Max: 17
Test result value: 17
PASS
----
TID:$1c CID:$06
-
Max: 119
Test result value: 17
PASS
----
TID:$21 CID:$07
-
Min: 6
Test result value: 6
PASS
----
TID:$22 CID:$07
-
Min: 58
Test result value: 58
PASS
----
TID:$23 CID:$07
-
Max: 17
Test result value: 17
PASS
----
TID:$24 CID:$07
-
Max: 119
Test result value: 58
PASS
----


End of report.

 

[ArmAir1]

O2 voltage is always higher on sensor 2- does this mean anything?

Some screen shots:

Idle 1

Idle 2

70 MPH Cruise 1

70 MPH Cruise 2

Reading seem more stable since ECU reset but not sure about the O2 sensor voltage variance.

This error seems to have gone away since reset:
TID:$04 CID:$02
- High sensor Voltage for switch time calculation
Min: 50
Test result value: 36
FAIL

 

[HRTKD]

I hope you get this figured out. I suspect I have a similar issue with bank 2.

 

[dubyam]

I wish I could be more help here. I went through a fuel trim and O2 sensor evaluation with my wife's Expedition and then with my Titan but luckily for me, the T was just in a relearning curve after transmission replacement. The wife's expy has a sensor which is a little lazy, but I haven't gotten around to replacing it yet.

 

[OnTheWrongSide]

well, normal behaviour for an o2 sensor is to jump around a lot, if you have one or more giving out the same voltage at all times, or responding slowly (eg if you floor the throttle it doesn't go immediately rich, or immediately lean when you stop revving) then the sensor is dead.

But I'm not familiar with the Titan o2 setup, where are the sensors physically located? Are there 2 in each manifold?

 

[ArmAir1]

Titans have (4) catalyst system with (4) O2 sensors. The primary cats are integral with the exhaust manifolds. The first O2 sensors are on the collector portion of the exhaust manifolds upstream of the primary cats. Immediately downstream of the primary cats are the second O2 sensors- downstream of those are the secondary cats. My understanding is the sensors on the manifolds are the fuel management sensors and the sensors after the cats are strictly emissions monitoring sensors.

If I am not correct someone please chime in....