Question about Mercury Villager

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I have a 99 mercury villager, getting a 0340 code. it says its for a crankshaft sensor but vehicle doesn't have one. What does this code mean?

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  • Mercury Master
  • 8,582 Answers

Hi, code 340 is for the camshaft sensor. Below is a test you can run to check the sensor. The PCM is above the glovebox. Do not disconnect or remove the PCM. Just remove the glove box and probe the back of the connector to access the pins indicated in the cam sensor test. Please let me know if you have any questions, and thanks for using FixYa.

1999-00 Vehicles

On 1999-00 vehicles, the camshaft position sensor must be checked with the engine running. If a no start condition is encountered, observe the MIL. With the ignition switch on and the engine off, the MIL should be illuminated. If the camshaft position sensor is functioning, the MIL should go out when cranking the engine.

  1. Run the engine until it reaches normal operating temperature. Leave the engine running.
  2. Using a voltmeter set to the DC range, connect the negative lead of a voltmeter lead to the negative battery terminal or chassis ground.
  3. Connect the positive voltmeter lead to the back of the PCM electrical connector in terminal 44.
PCM pinout

I have a 99 mercury - jturcotte_1222.gif

  1. Observe the voltmeter reading. The reading should be 0.3-0.5 volts.
  2. Disconnect the positive voltmeter lead from terminal 44, and connect it to terminal 49.
  3. Observe the voltmeter reading. The reading should be approximately 2.5 volts.
  4. Perform steps 3 through 6 with the engine at 2,000 rpm with the transaxle in park. The voltage readings should be the same.
  5. If the observed voltages are not within specifications, the sensor may be faulty.

REMOVAL & INSTALLATION
The camshaft position sensor is part of the distributor assembly, and must be replaced as a unit. Please refer to Engine Electrical, Distributor Ignition System, Distributor, Removal and Installation for the procedure.

Posted on Mar 12, 2011

  • 5 more comments 
  • lilblkshp Aug 29, 2011

    i got a 99 that a critter ate an injector wire. what all contributes to the computer sending injector pulse? new crank sensor, known good pcm and dist with cam sensor out of working van, all non essential sensors unplugged and no injector pulse?????????

  • Jeffrey Turcotte
    Jeffrey Turcotte Aug 29, 2011

    Hi, it's hard to say what the logic is in a particular computer, but the PCM and injection circuits must be energized. They can usually get by with a crank sensor signal and will use the last idle pulse width they knew. Off idle, they need data from a MAF and/or MAP and/or TPS sensor to adjust the pulse width appropriately. After warmup, they will use O2 sensor feedback to adjust pulse width. Are any of your injectors firing? If not, check to see if they are getting power and also check for an AC signal while cranking. If only the one injector is not firing, it's possible the rat caused a short that burned the transistor in the PCM.

  • Jeffrey Turcotte
    Jeffrey Turcotte Aug 29, 2011

    here is the diagram



  • lilblkshp Aug 30, 2011

    thanks alot. yeah all of them have 12 volts but not getting the ground pulse from pcm. switched pcm with known good pcm out of other van i have here and no difference. gonna switch again to be sure. checked continuity in harness and got it. when i initially found the chewed wire i just seperated them and had a pulse, so i repaired(solder and heat shrink to keep down resistance) and the pulse went away and hasnt came back yet. new crank sensor but i pulled the short harness and on the sensor side theres two wires but the other side that plugs to harness has three?

  • lilblkshp Aug 30, 2011

    thanks alot. do you know what the extra wire on other side of crank sensor plug is? theres two wires on sensor side and three on harness side? when i initially found the frayed wire i seperated them and had a pulse, i repaired the wire with solder and heatshrink and the pulse went away and i cant get it back. gonna try and swap the pcm again with a working van i have here. new crank sensor. checked harness for continuity and it checked out????????

  • lilblkshp Aug 30, 2011

    thanks again for the help. swapped the pcms again to be sure and the one out of this van wont run the other, no pulse. the pcm out of the other gives me my pulse back, so i guess in the process the other pcm decided to call it quits. thanks alot

  • Jeffrey Turcotte
    Jeffrey Turcotte Aug 30, 2011

    an extra wire from the crank sensor may be for a tach or some other use. So are you up and running or still need help?

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