Crank sensor 98 chev 4.3

PULVERISOR

MEMBER
1998 CHEVROLET TRUCK

I've got a 98 chev pickup 2wd 4.3.
It keeps giving me a code 338.
Its now at the point where it almost impossible to drive which is why I'm getting frustrated cause I have checked everything except the wiring, I'm getting the vehicle back tomorrow so I will check for shorts in and connection problems in the circuit to the module and the pcm.

I've tried a new crank sensor, no go.
I normally have distributor problems so I changed that. No go. Normally I get a crankshaft camshaft correlation code when its a distributor problem.

I thought possible timing chain slack cause my cam retard is bouncing around -10 to -11. Which I know isnt right. Should be 0 to -4. Any ideas would be great thank you.

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

P0338. Crankshaft Position Sensor A Circuit High Input is it getting the voltage reference from PCM?

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Saturday, August 11th, 2007 AT 5:32 PM

RASMATAZ

MECHANIC
75,992 POSTS

P0338. Crankshaft Position Sensor A Circuit High Input

The CPS function the same way as the pick-up and trigger wheel in an electronic distributor.

Its purpose is to tell the PCM the position of the crankshaft and the no.1 cylinder to include the engine rpm.

Note: some engines uses a seperate Cam sensor that the PCM uses to determine the correct firing order.

In the event the CPS fails completely the engine will not start and its normally caused by a sensor wiring harness problem

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Saturday, August 11th, 2007 AT 5:49 PM