1997 LT1 pinout and schematic including CKP sensor

[RAF7789]

Im trying to find a 1997 LT1 pinout and schematic including CKP sensor. I am diagnosing codes p0335 and p0336. I have looked at the schematics and pinouts on Rob's site and had no luck.

or if anyone knows what bank the crankshaft position sensor plugs into and where it gets the 5v source.....

Thanks

[Injuneer]

You missed part it.... he has the pinouts for 95, and marked in red to reflect the 96/97 changes, including the CKP.

http://shbox.com/1/1995_pcm_conn_a.jpg

Not sure about the question of "what bank it ties into".... its not specific to one bank of the engine. It reading the crankshaft velocity for both banks of the engine.

My Chilton's shows the CKP sensor has a yellow reference (signal) wire that goes to pin A1, as noted on the chart above. The pink/black wire is the "reference low" = ground, from the same pin as the Opti low reference (B3). The pink wire gets 12V from fuse #11 in the under hood box.

[Rob B (shoebox)]

You also missed this Distributor Ignition System Schematic (1996-97) that shows what you want. Better hone those search skills.

[RAF7789]

Thanks guys that showed me exactly what i needed to know. I seem to have bypassed the CKP reference signal by replacing the wire for the Distributor Reference Low signal straight to the PCM.

Oddly the engine starts and runs fine. I do have problems starting the car back up after driving for more than 5 mins and turning it off. Could this be a correlation with the P0335, P0336 DTCs?

Fred to clarify, by "bank" i meant PCM pin. I thought i heard the pins called "banks"

One question though, what exactly does the CKP sensor do? and when is it gathering data? (does it only collect data under certain circumstances--like closed or open loop-- or all the time?)

Thanks again gentlemen.

[Rob B (shoebox)]

The crank sensor was required by OBD-II for misfire detection. That's all it does on an LT1. It is not used for spark delivery like crank sensors on most other cars. The LT1 has the optispark that determines crank position. The outputs from the opti and crank sensor are compared in the PCM to determine misfires.

[RAF7789]

Thanks Rob!