What is an output sensor circuit malfunction?

1st one is from not having a t-stat. The PCM needs to see a certain temperature coolant before it switches to closed loop. No t-stat usually prevents the coolant from fully heating up.

2nd one is probably from the misfire prob you had, and once you clear it it should be gone.

3 I don't know.. I've heard of that but can't remember what action to take besides replacing the speed sensor.

My guess as to the stalling problem is you have a really dirty or malfunctioning IAC valve, a screwy TPS, or something is unplugged, maybe a vac line or an electrical connector.

As to your last question, certain problems the PCM detects will immediately illuminate the MIL.. like a misfire, or a missing gas cap.

Other problems, the PCM will detect, and store. If it detects the same problem again (or a certain number of times,) it will illuminate the MIL. P1000 is a common pending code people see without the MIL being on.

Rickey_Bobby said:

P0720
output speed sensor
circuit malfunction


If i have a speed sensor problem, how is the speedometer still working?

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is your car auto?

Rickey_Bobby said:

it was an auto, it has a TR-3650 in it now.
...and none of these flagged my check engine light...

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and which Output Shaft Speed Sensor did you use? the one off the automatic or did you get one for a manual trans?