Invalid PID

[mk6gtracer]

I'm trying to tune my LS1. I'm using a 1220411 PCM with a custom (MAFless) operating system. I get an invalid PID message when I try to look at HO2S21. Any ideas as to what I'm doing wrong?
Thanks

[mr.prick]

Have you validated all PIDs?
Sometimes some PIDs will be Xed out after launching the software
but will be valid once logging begins.
Select it anyways and start logging.

[mk6gtracer]

Thanks for the reply. I have selected it anyway. When I log the data, it flatlines.

[joecar]

Connect to vehicle and validate pids.

[mr.prick]

Thanks for the reply. I have selected it anyway. When I log the data, it flatlines.
The PID becomes valid?

Any O2 DTCs?

[mk6gtracer]

The PID does become valid, I guess, when I log data, at least it isn't x'd out. Problem is, the data never changes.

[mk6gtracer]

The PID for the left bank logs data and oscillates as you would expect

[mr.prick]

The sensor may be dead.

[joecar]

Post some logs.

[mk6gtracer]

I connected the sensor for the right bak, which has and still is working. The value stayed at .250, never fluctuated. I checked continuity back to the PCM, no problems there either

[mk6gtracer]

5817

5818

[joecar]

Looks like HO2S21 sensor wires may be shorted somewhere...

Could possibly be a bad PCM.

Swap the left sensor with the right sensor and see if the flatline voltage follows the sensor or if it stays on the same side.

[mk6gtracer]

I did swap the sensors. Voltage did not follow the sensor. Its always the right bank. Check continuity back to the PCM, no problems there either. I'm thinking PCM. Thanks for the reply

[mk6gtracer]

Update. I did a full reflash on the PCM and revalidated the PIDs. Its working fine now. Except I can't get it to do a crank relearn. Thanks for the help!

[joecar]

What happens when you try to do a crank relearn...?

[mk6gtracer]

Nothing. Revs just keep going up. fuel never cuts off and relearn code stays set

[edwardzracing]

Are you certain it needs to be relearned?

[joecar]

Have you met all the conditions (operating temperature, zero VSS, P/N, brake applied, others)...?

Which OS are you using...?

[mr.prick]

1. Set the parking brake and block the drive wheels.
Make sure that the hood is closed.
2. Start the engine and make sure that the engine coolant temperature is at least 158 degrees F. (70 degrees C.)
3. Turn the engine off for at least 10 seconds.
4. Select the crankshaft position variation learn procedure (CASE Learn)on your scan tool.
5. Make sure that the transmission is in Park. Start the engine.
6. Apply the brakes and hold the pedal firmly.
7. Follow the scan tool instructions.
Remember: That you are going to increase the engine speed to approximately 3000 RPM, 4000 RPM, or 5150 RPM. That’s the variation learn fuel cutoff RPM (depending upon the engine), and that it’s important to release the throttle when the engine RPM starts to decrease as a result of the fuel cutoff going into effect.
Failure to do such will result in over revving of the engine, causing possible engine damage.
8. Once the engine has returned to idle, check the status of Diagnostic trouble code P1336. If the scan tool indicates that the CASE has been
learned, the relearn procedure is now complete.
If CASE has not been learned, check for the presence of other power train codes.
If any exist, correct the problem, then repeat this procedure.

NOTE: If the Crankshaft Variation
Relearn is not accessible through
your scan tool (some truck
applications 1998 & later), perform
the relearn in the following
manner:
1. Turn off all of the accessories.
With the Air temperature sensor and Coolant temperature within 5 degrees
(Centigrade) of each other, start the engine and let it idle in Park or Neutral for two minutes.
2. Accelerate the vehicle to 55 mph at part throttle. Cruise at 55 mph for 8-
10 minutes until the engine reaches operating temperature.
3. Cruise at 55 mph for another 5-6 minutes.
4. Decelerate to 45 mph without using the brakes, and maintain 45 mph for 1 minute.
5. Perform 4 deceleration cycles, without using the brakes, of 25 seconds each where no specific speed is necessary.
Returning to 45 mph for 15 seconds in between deceleration cycles.
6. Accelerate to 55 mph and cruise for 2 minutes.
7. Stop the vehicle and idle for 2 minutes with the brake applied and the transmission in Drive (automatic trans.) or Neutral (manual trans.) with the clutch depressed.