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'99 Explorer Sport P0340 problem! help!

Discussion in 'Under the Hood' started by yamatallica, March 14, 2010.

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    1. yamatallica

      yamatallica New Member

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      City, State:
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      Year and Model:
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      hey y'all, I recently acquired a 1999 Explorer sport with 140,000 miles from a buddy who's been having trouble with the cam sensor code (4.0L SOHC).....I've replaced the sensor (twice), fuel pump and filter (just because), alternator, coil pack and ECU to no avail.

      Here are the symptoms: I can clear the code out, drive it for 5-10 miles with no problems at all. while driving, the check engine light flickers on and off at different brightnesses and the car dies. i normally can limp it back home, starting it, driving it for a hundred yards or so at a time between engine stalls. after it sits overnight, the process can be repeated without any change. as long as the CEL is flickering, my scanner will not connect with the OBDII system. when it is solid, it shows the P0340 code every time. any suggestions on what to do next?

      any leads whatsoever will be greatly appreciated! I don't want to set this explorer on fire! =-)
       
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    3. RickOTR

      RickOTR Active Member

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      Have you tried to replace the Crankshaft Position Sensor. If not, give it a try, it works in conjunction with the Camshaft position sensor. Here are a few other things to check as well.

      INTERMITTENT CRANKSHAFT POSITION SENSOR SIGNAL
      INTERMITTENT CAMSHAFT POSITION SENSOR SIGNAL
      5 VOLT SUPPLY CIRCUIT SHORTED TO GROU
      5 VOLT SUPPLY CIRCUIT OPEN
      5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
      CMP SIGNAL CIRCUIT SHORTED GROUND
      CMP SIGNAL CIRCUIT OPEN
      CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE
      CMP SIGNAL SHORTED TO 5 VOLT SUPPLY CIRCUIT
      SENSOR GROUND CIRCUIT OPEN
      PCM - 5 VOLT SUPPLY
      PCM - CMP SIGNAL
       
    4. BobWiersema

      BobWiersema Well-Known Member

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      Yep. Change them both.

      This is from obd-codes.com

      Camshaft Position Sensor Circuit Malfunction

      Causes

      A code P0340 could mean one or more of the following has happened:

      * a wire or connector in the circuit could be grounded/shorted/broken
      * the camshaft position sensor may have failed
      * the PCM may have failed
      * there exists an open circuit
      * the crankshaft position sensor may have failed

      Possible Solutions

      With a P0340 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

      * Visually inspect all the wiring and connectors in the circuit
      * Check for continuity in the circuit wiring
      * Check the operation (voltage) of the camshaft position sensor
      * Replace the camshaft position sensor as required
      * Check the crankshaft position circuit as well
      * Replace circuit wiring and/or connectors as required
      * Diagnose/replace the PCM as required
       
    5. yamatallica

      yamatallica New Member

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      where exactly is the crankshaft position sensor located? and what is a reliable brand of part to go with? I see several different parts/part numbers on the O'Reilly website....

      Thank you for the prompt responses, I hate to sound like a complete idiot, but this car is certainly making me feel like one!
       
    6. RickOTR

      RickOTR Active Member

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      On the crankshaft Balancere pully on the passenger side. Has two wires going to it. There are two small bolts that holds it in place. No adjustment required.
       
    7. yamatallica

      yamatallica New Member

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      well, i changed the crank position sensor.....no changes, the car still presents with the same symptoms. i'm planning on starting the process of checking the circuit itself...

      the car acts as if its running out of gas when it dies....does this change your opinions?
       
    8. Bogatee

      Bogatee New Member

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      I just got this same code, P0340, on the way back from fishing with my boat. I checked out my haynes manual and it said to check the connector first, which should get 1.5A with the ignition on and engine off. I wasnt getting any reading so i checked the fuse for the CMP. Fuse was still in tact but the connections had some crud so i took a small piece of sand paper to it and plugged it back in. What do ya know, no more check engine light. Lucky me i guess. Had a similar issue with the fog lamps, disconnected the relay, blew it off, plugged it back in and wallha! Fog lamps work. Check fuses first...
       

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