P1690 - Dodge Cummins Diesel Forum

98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

 
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post #1 of 9 (permalink) Old 12-18-2009, 12:07 PM Thread Starter
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P1690

Hey guys. A buddy of mine called me up this morning and his truck is loping really bad at about 1400 RPM at idle. When stopped and rev the engine up it still runs pretty crappy, but when driving and under a load he says it runs perfect. I havent seen the truck when running like this since hes on the other side of the state right now, just goin off of what he says.

He pulled up the code P1690 which I find as--CKP sensor does not agree with ECM CKP sensor.

Its a 2000 3/4 ton, 5-speed, with a PPE lift pump, has good fuel pressure. Edge comp and superchip but they are both turned off and edge is unplugged now.


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post #2 of 9 (permalink) Old 12-18-2009, 12:53 PM
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Replace the sensor and it should be good to go.

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post #3 of 9 (permalink) Old 12-19-2009, 01:52 AM Thread Starter
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what sensor would that be?

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post #4 of 9 (permalink) Old 12-19-2009, 09:59 AM
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The crankshaft position sensor. Have your buddy clean ALL the grounds -batteries, behind the starter, and under the drivers side battery traym and any others that he might fine and see iof that fixes the problem first.

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post #5 of 9 (permalink) Old 12-19-2009, 04:02 PM
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The CKP is located above and behind the starter, which has to be removed to change it.

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post #6 of 9 (permalink) Old 12-20-2009, 02:52 AM Thread Starter
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ohh alrite Thanks, I'll pass it on.

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post #7 of 9 (permalink) Old 12-20-2009, 10:20 AM
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If that doesn't work you might check the wiring... Here is a write up fot checking that...
VP44 Error Codes

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post #8 of 9 (permalink) Old 12-21-2009, 02:22 AM Thread Starter
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well, I let him know and he called me back today and said he went into mopar mans website and followed the directions on what wires to inspect and check out...he says everything checked out as should be so is kinda thinking its the ECM he also changed the crank sensor and had made no difference.

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post #9 of 9 (permalink) Old 12-21-2009, 03:13 AM
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Quote:
Originally Posted by j_ray05 View Post
well, I let him know and he called me back today and said he went into mopar mans website and followed the directions on what wires to inspect and check out...he says everything checked out as should be so is kinda thinking its the ECM he also changed the crank sensor and had made no difference.
only check for the ecm is verify resistance from ground at connector to ground. and verify +5v at connector.

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