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1998 chevy p/u, crank, no start


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farm kid
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Apr 6, 2012, 1:02 AM

Post #1 of 12 (2027 views)
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1998 chevy p/u, crank, no start Sign In

code p0336 (crank sensor), replaced sensor,checked wiring harness for continuity to ecm, power and ground in harness ok. Also tried coil, ignition module, still no spark. Has fuel pressure, pump cycles normally. Thanks for any advice.


Discretesignals
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Apr 6, 2012, 7:45 AM

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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

Which pickup? engine size? Please don't type Cheyenne.





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farm kid
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Apr 6, 2012, 6:26 PM

Post #3 of 12 (1938 views)
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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

Vehicle is a 1998 Chevy K3500, 454, automatic.


Hammer Time
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Apr 6, 2012, 7:36 PM

Post #4 of 12 (1932 views)
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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

Make sure you didn't bend any pins over in the sensor. I've seen that happen a couple times.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Apr 6, 2012, 9:33 PM

Post #5 of 12 (1924 views)
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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

Inspect the crank sensor connector as HT stated.

The crank sensor is a hall effect. Do you have a multimeter and a 12 volt test lamp?





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farm kid
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Apr 7, 2012, 1:18 AM

Post #6 of 12 (1915 views)
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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

H/T, pins in connector ok,had that happen also, have multimeter(digital) and test lamp.


Discretesignals
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Apr 7, 2012, 1:34 AM

Post #7 of 12 (1912 views)
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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

At the crank sensor connector back probe the yellow wire at the connector.

Backprobing means sliding a pin or small paper clip into the back of the connector where the wire goes to make contact with the back of the terminal. This way you don't damage the terminals where they slide together.





Unplug the connector from the crank sensor.

Connect your meter's black lead to battery ground and touch the red lead to your back probe with the ignition on.

What is the voltage?





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farm kid
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Apr 22, 2012, 12:12 AM

Post #8 of 12 (1831 views)
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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

Sorry it took so song getting back on this. Voltage matched battery voltage (12.40) with ignition on and cranking (11.70).


Discretesignals
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Apr 22, 2012, 2:02 PM

Post #9 of 12 (1815 views)
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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

Plug the connector back in and move your back probe to the pink wire. Connect your meter lead to the probe and the other end to battery ground. Have someone crank the engine while you watch the voltage. What is the voltage?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


farm kid
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May 17, 2012, 9:47 AM

Post #10 of 12 (1734 views)
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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

Voltage reads zero.


Discretesignals
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May 17, 2012, 7:34 PM

Post #11 of 12 (1722 views)
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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

You have no power to the sensor. Check the ECM1 fuse in the fuse panel under hood. If the fuse looks good, turn the ignition on and check for power at the fuse.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


farm kid
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Jun 6, 2012, 10:19 PM

Post #12 of 12 (1643 views)
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Re: 1998 chevy p/u, crank, no start [In reply to] Sign In

Rechecked voltage, must have had bad connection on tester. Voltage is same as battery with ignition on. Also tried different coil, ignition module, crank sensor. the help has been appreciated.


(This post was edited by farm kid on Jul 10, 2012, 1:36 AM)




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