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Tuner in Training
CEL just came up..
I was driving yesterday and got my 1st CEL. I ran VCM scanner this evening and got the codes. [ECM] P0121 TP Sensor Circuit Insufficient Activity (Old) (History) (Immature) and [ECM] P0121 TP Sensor Circuit Insufficient Activity. I had installed a VMAX port and polished throttle body about two months ago and all has seemed fine. I am curious as if this is related to it. The only change I made back when I installed the throttle body was Engine>Idle>Airflow>Base Running Airflow>Airflow Final Minimum. I lowered these values by 25% to help idle. Any ideas? and what does this error mean? Possible scenarios that could happen with this error present? How to correct?
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Senior Tuner
Bad tps, bad connection, harness fault are most common.
Could be PCM but unlikely.
Hard to say if its a tune issue without looking at file but I suspect a bad TPS or connection.
Will need to scan and log tps
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Tuner in Training
Well, all seems ok for now. All day today, the CEL light has vanished and the errors are gone. I made no change of any kind.