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Dan
Dan, Technician
Category: Saturn
Satisfied Customers: 24205
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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P0335 Crankshaft sensor circuit malfunction. Tested CKP

Customer Question

P0335 Crankshaft sensor circuit malfunction. Tested CKP sensor and Resistance found within range. Tested wires to ECM and continuity found. Clear codes and still getting P0335.
Submitted: 1 year ago.
Category: Saturn
Customer: replied 1 year ago.
Car will not start. No spark found
Expert:  Dan replied 1 year ago.

Hello, my name is***** is no resistance specification for the crankshaft position sensor and checking resistance is not a good way to test the sensor. This code/symptom almost always means the crank sensor has failed, has it been replaced? Thanks.

Customer: replied 1 year ago.
we recently replaced it and nothing changed. Cleared code and it returned when it was cranked. The manual shows crankshaft should have a resistance of 600-900 ohms which both new and old have it
Expert:  Dan replied 1 year ago.

Disconnect sensor and check to see if both wires going to sensor have 5v with key on. Let me know, thanks.

Customer: replied 1 year ago.
Both wires going to sensor have ground signal. No voltage when tested each to ground with key on
Customer: replied 1 year ago.
When tested with key on to power. They both had same voltage as battery, 11.57v
Customer: replied 1 year ago.
Remove insulation and confirmed no rips/tears or wires touching ground and traced it back to ECM with no faults found
Customer: replied 1 year ago.
Car was running fine but had a knock. Engine was replaced and haven't been able to fire since. ECM was unplugged after battery off prior to swap.
Expert:  Dan replied 1 year ago.

Have you tested crankshaft position sensor resistance at ECM plug to verify resistance is the same which would prove wiring to be good?

Expert:  Dan replied 1 year ago.

As of now it either sounds like wiring has been shorted to ground or ECM has failed.

Customer: replied 1 year ago.
resistance matches with both sensors. No resistance when CKP unplugged
Customer: replied 1 year ago.
Again, this is both measures at sensor and at pin location on ECM connector
Customer: replied 1 year ago.
We ripped the rear O2 sensor so we have it unplugged. We've never had a cat not start due to an rear O2 sensor
Expert:  Dan replied 1 year ago.

I don't see any other possible options besides failed ECM at this point and I'd go ahead and replace. The rear o2 sensor would not effect crank sensor signal to the ECM so I agree that would not be your issue. Let me know if you have more questions, thanks.

Customer: replied 1 year ago.
Car*
Customer: replied 1 year ago.
How can we confirm ECM is faulty? You mentioned both purple and yellow wires should have 5V, but they don't, is that odd?
Customer: replied 1 year ago.
Wouldn't I have intermittent spark with bad CKP signal?
Expert:  Dan replied 1 year ago.

The ECM provides the crank sensor the voltage so that would also confirm ECM as problem. This code means ECM does not see a crank signal which would be caused by crank sensor, wiring, or ECM. You have already replaced crank sensor and verified wiring is good leaving the ECM as last possible option. A failed CKP will usaully cause no spark, not intermittent spark. Let me know if you have more questions, thanks.