Question about 1996 Chevrolet Silverado 2500

2 Answers

How do i reset the ecm of my 1996 chevy silverado 1500

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  • villarrealc8 Oct 13, 2010

    hi i have a code is P1345 can somebody help

  • villarrealc8 Oct 14, 2010

    Hey man thanks alot that you are trying to help me, the truck already has a new crank and camshaft psition sensor two new oxygen sensors that were coming out and distributor cap , rotor and the distributor itself and the mechanic end up telling me that it can be the ecm or the time chain and i don't know may be he didn't put the distributor the right way or i don't know what to thinks anymore.

  • villarrealc8 Oct 15, 2010

    Another mechanic told me that it ca be the time chain too loose because some times when try to turn on the truck it crank but it pause like for a second and then it will start, is there a way to know if the time chain is too loose

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2 Answers

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  • Chevrolet Master
  • 6,826 Answers

Use the OBD-II scanner for 1996 and up vehicles to clear codes and shut the service engine soon light off if set. I would read the codes before doing this, though, to get a clue as to what is tripping the ECM's light in the first place.

One can get a scanner for under $100 from Sears or Walmart or get the local Autozone or Advance Auto Parts to do it for free, if they do that in your area.

Posted on Oct 13, 2010

  • 6 more comments 
  • Duane Wong
    Duane Wong Oct 13, 2010

    P1345 is "Crankshaft position sensor / Camshaft position sensor correlation". Same code for both and it either is malfunctioning or needs adjustment.

  • Duane Wong
    Duane Wong Oct 13, 2010

    It's recommended to disconnect the neg. cable first, since the pos. cable if disconnected, can connect with a wrench to the neg. grounded chassis and cause a short that can damage the car's electronics like the alternator.

  • villarrealc8 Oct 14, 2010

    How can you know if the distributor is not install correctly, the truck has new cam and crankshaft sensors and the mechanic replace the distributor.

  • Duane Wong
    Duane Wong Oct 14, 2010

    Distributor
    Removal

  • Duane Wong
    Duane Wong Oct 14, 2010

    Distributor


    Removal & Installation


    4.3L, 5.0L & 5.7L Engines

    To Remove:

    NOTE: There are two procedures available to install the distributor


    • Use Installation Procedure 1 when the crankshaft has not been rotated from the original position
    • Use Installation Procedure 2 when any of the following compartments are removed:

      1. The intake manifold
      2. The cylinder head
      3. The camshaft
      4. The timing chain or sprockets
      5. The complete engine

    • If the malfunction indicator lamp (MIL) turns on and DTC P1345 sets after installing the distributor, this indicates an incorrectly installed distributor. Engine damage or distributor damage may occur. Use Procedure 2 in order to install the distributor


    1. Before servicing the vehicle, refer to the Cautions and Warnings in the beginning of this section
    2. Turn off the ignition
    3. Remove the spark plug and ignition coil wires from the distributor cap.
    4. Remove the electrical connector from the base of the distributor.










    5. Remove the two screws that hold the distributor cap to the housing.










    6. Use a grease pencil in order to note the position of the rotor in relation to the distributor housing (A)
    7. Mark the distributor housing and the intake manifold with a grease pencil.










    8. Remove the mounting clamp hold down bolt.
    9. Remove the distributor.











    NOTE: As the distributor is being removed from the engine, watch the rotor move in a counter-clockwise direction about 42 degrees. Note the position of the rotor segment. Place a second mark on the base of the distributor (B). This will aid in achieving proper rotor alignment during the distributor installation.

    To Install:

    Installation Procedure 1











    NOTE: If installing a new distributor assembly, place two marks on the new distributor housing in the same location as the two marks on the original housing and align the rotor with the second mark (B)


    1. Guide the distributor into the engine.
    2. Align the hole in the distributor hold-down clamp over the mounting hole in the intake manifold.
    3. As the distributor is being installed, observe the rotor moving in a clockwise direction about 42 degrees.
      NOTE: If the rotor segment is not aligned with the number 1 mark, the driven gear teeth and the camshaft have meshed one or more teeth out of alignment. In order to correct this condition, remove the distributor and reinstall it. Once the distributor is completely seated, the rotor segment should be aligned with the mark on the distributor base.

    4. Install or connect the following:

      • Distributor mounting clamp bolt and tighten the distributor clamp bolt.

        1. Torque to: 20 ft. lbs. (27 Nm)

      • Distributor cap
      • Two new distributor cap screws and tighten the screws.

        1. Torque to: 45 inch lbs. (5 Nm)

      • Electrical connector to the base of the distributor
      • Spark plug wires and ignition coil wires to the distributor cap

      NOTE: If the Malfunction Indicator Lamp (MIL) turns on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly. See Installation Procedure 2 if MIL turns on after installing the distributor.

    5. Test drive the vehicle to confirm the repairs.

    Installation Procedure 2











    NOTE: Rotate the number 1 cylinder to top dead center (TDC) of the compression stroke. The engine front cover has 2 alignment tabs and the crankshaft balancer has 2 alignment marks (spaced 90 degrees apart) which are used for positioning number 1 piston at top dead center (TDC). With the piston on the compression stroke and at top dead center, the crankshaft balancer alignment mark (A) must align with the engine front cover tab (B) and the crankshaft balancer alignment mark (D) must align with the engine front cover tab (C)

    Previous Next

  • Duane Wong
    Duane Wong Oct 14, 2010

    OTE: As the distributor is being removed from the engine, watch the rotor move in a counter-clockwise direction about 42 degrees. Note the position of the rotor segment. Place a second mark on the base of the distributor (B). This will aid in achieving proper rotor alignment during the distributor installation.


    To Install:

    Installation Procedure 1











    NOTE: If installing a new distributor assembly, place two marks on the new distributor housing in the same location as the two marks on the original housing and align the rotor with the second mark (B)


    1. Guide the distributor into the engine.
    2. Align the hole in the distributor hold-down clamp over the mounting hole in the intake manifold.
    3. As the distributor is being installed, observe the rotor moving in a clockwise direction about 42 degrees.
      NOTE: If the rotor segment is not aligned with the number 1 mark, the driven gear teeth and the camshaft have meshed one or more teeth out of alignment. In order to correct this condition, remove the distributor and reinstall it. Once the distributor is completely seated, the rotor segment should be aligned with the mark on the distributor base.

    4. Install or connect the following:

      • Distributor mounting clamp bolt and tighten the distributor clamp bolt.

        1. Torque to: 20 ft. lbs. (27 Nm)

      • Distributor cap
      • Two new distributor cap screws and tighten the screws.

        1. Torque to: 45 inch lbs. (5 Nm)

      • Electrical connector to the base of the distributor
      • Spark plug wires and ignition coil wires to the distributor cap

      NOTE: If the Malfunction Indicator Lamp (MIL) turns on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly. See Installation Procedure 2 if MIL turns on after installing the distributor.

    5. Test drive the vehicle to confirm the repairs.

    Installation Procedure 2











    NOTE: Rotate the number 1 cylinder to top dead center (TDC) of the compression stroke. The engine front cover has 2 alignment tabs and the crankshaft balancer has 2 alignment marks (spaced 90 degrees apart) which are used for positioning number 1 piston at top dead center (TDC). With the piston on the compression stroke and at top dead center, the crankshaft balancer alignment mark (A) must align with the engine front cover tab (B) and the crankshaft balancer alignment mark (D) must align with the engine front cover tab (C)


    1. Rotate the crankshaft balancer clockwise until the alignment marks on the crankshaft balancer are aligned with the tabs on the engine front cover and the number 1 piston is at top dead center of the compression stroke.










    2. Remove the distributor cap screws and distributor cap.
    3. Align white paint mark on the bottom stem of the distributor, and the pre-drilled indent hole in the bottom of the gear (C)
      NOTE: The ignition system distributor driven gear and rotor may be installed in multiple positions. In order to avoid mistakes, mark the distributor on the following components in order to ensure the same mounting position upon reassembly.


      • The distributor driven gear
      • The distributor shaft
      • The rotor holes

      NOTE: Installing the driven gear 180 degrees out of alignment, or locating the rotor in the wrong holes, will cause a no-start condition and premature engine wear or damage may result.

    4. The rotor should point the cap hold down mount nearest the flat side of the housing.
    5. Using a long screw driver, align the oil pump drive shaft to the drive tab of the distributor
    6. Guide the distributor into the engine making sure that the spark plug towers are perpendicular to the centerline of the engine










      NOTE: Once the distributor is fully seated, the rotor segment should be aligned with the pointer cast into the distributor base. This pointer may have a 6 cast into it, indicating that the distributor is to be used on a 6 cylinder engine, or a 8 cast into it, indicating that the distributor is to be used on a 8 cylinder engine. If the rotor segment does not come within a few degrees of the pointer, the gear mesh between the distributor and the camshaft may be off a tooth or more. If this is the case, repeat the procedure again in order to achieve proper alignment.

    7. Install or connect the following:

      • Distributor mounting clamp bolt and tighten the distributor clamp bolt.

        1. Torque to: 20 ft. lbs. (27 Nm)

      • Distributor cap
      • Two new distributor cap screws and tighten the screws.

        1. Torque to: 45 inch lbs. (5 Nm)

      • Electrical connector to the base of the distributor
      • Spark plug wires and ignition coil wires to the distributor cap

      NOTE: If the MIL turns on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly. Repeat the installation procedure 2 if MIL turns on after installing the distributor.

    8. Test drive the vehicle to confirm the repairs

    7.4L Engine

    To Remove:


    1. Before servicing the vehicle, refer to the Cautions and Warnings in the beginning of this section.
    2. Remove engine cover (if equipped).
    3. Turn off the ignition.
    4. Remove the ignition coil.
    5. Remove the spark plug wires from one side of the distributor cap and set aside.
    6. Remove the distributor cap.
    7. Remove the distributor hold down bolt and clamp.
    8. Remove the distributor.

    To Install:


    1. Rotate the number 1 cylinder to top dead center (TDC) of the compression stroke.
    2. Remove the distributor cap screws and distributor cap.
    3. Align white paint mark on the bottom stem of the distributor and the pre-drilled indent hole in the bottom of the gear.
    4. Using a long screw driver, align the oil pump drive shaft to the drive tab of the distributor.
    5. Guide the distributor into the engine making sure that it is fully seated in the engine.
      NOTE: If the distributor is not fully seated, the distributor shaft may not be properly aligned with the oil pump drive shaft. Once the distributor is fully seated, the rotor segment should be aligned with the pointer cast into the distributor base. This pointer may have an 8 cast into it, indicating that the distributor is to be used on an 8 cylinder engine. If the rotor segment does not come within a few degrees of the pointer, the gear mesh between the distributor and the camshaft may be off a tooth or more. If this is the case, repeat the procedure again in order to achieve proper alignment.

    6. Install or connect the following:

      • Distributor mounting clamp bolt and tighten the distributor clamp bolt.

        1. Torque to: 24 ft. lbs. (33 Nm)

      • Distributor cap
      • Two distributor cap screws and tighten the screws.

        1. Torque to: 40 inch lbs. (5 Nm)

      • Ignition coil to upper intake manifold.
      • Ignition coil bracket bolt and stud to upper intake manifold

        1. Torque to: 18 ft lbs. (25 Nm).

      • Fuel injector wiring harness connector to ignition coil bracket.
      • Ignition coil wire to distributor and ignition coil.
      • Spark plug wires
      • Engine cover (if equipped)

    7. Connect scan tool and monitor the camshaft ****** offset value.
    8. Test drive the vehicle to confirm the repairs.


    Previous Next

  • villarrealc8 Oct 15, 2010

    how would i know if the time chain is too loose

  • Duane Wong
    Duane Wong Oct 15, 2010

    It's like a bicycle chain, if the chain rubs against any other parts of the engine, then it's too loose and worn.


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  • Chevrolet Master
  • 17,970 Answers

Just disconnected the negative cable battery few minutes. If the check codes turn on again, then you have one problem there.

Send us the codes to additional details.

Hope helps.

Posted on Oct 13, 2010

  • 1 more comment 
  • villarrealc8 Oct 13, 2010

    is the same if i disconnect the positive cable, and i have a code P1345

  • Duane Wong
    Duane Wong Oct 13, 2010

    I would disconnect the neg. cable first for safety reasons.

  • ZJ Limited
    ZJ Limited Oct 14, 2010

    P1345 - No CMP or SGC Signal

    Code P1345 dertermines if the distributor is installed incorrectly, or
    if a mechanical malfunction is present in the engine. The light will
    trigger when the engine is running and the camshaft sensor reference
    pulse is not detected at a correct relative position with the crankshaft
    pulse. Most likely causes for this Chevy check engine light code
    include a faulty crankshaft position sensor, a wiring concern or an
    improperly installed distributer. A quick check on the crankshaft sensor
    is to monitor the RPM value with a scan tool while revving up the
    engine. If the reading is close to twice the expected RPM, then the
    sensor is likely faulty. There are other less likley concerns possible,
    such as base engine or computer related issues, but these involve more
    in depth testing.

    I hope this information is useful.

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mcgyver468
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SOURCE: where is the fuel pump shutoff switch located on a 1996 chevy silverado 1500 located

Should be on the passenger side kickplate below the glovebox and to the right. You may have to remove the plastic panel to access it or look for a small hole in it and feel around for the button

Posted on Apr 23, 2009

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SOURCE: 1996 chevy silverado 1500 problems to start fuell

engine?

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