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With engine running, unplug ignition coil pack one at a time and see if they all make a difference to the RPM of the engine, the one that doesn't is the bad one. Hope that helps
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The most common cause that will trigger the P1320 code is the ignition coils, one or more ignition coils may have failed. Even tough the coils may be working OK, the resistance for one or more of the coils is greater or smaller than the Engine Control Module (ECM) is expecting. Measuring the resistance with the coil out of the vehicle may not show any failures, usually the coil fails under heavy conditions (hard acceleration) or certain temperatures.
The P1320 code means that there is problem with the "Ignition Coil" or the wire to the ignition coil. For some models without individual ignition coils the Ignition Coil is inside the distributor and the distributor need to be replaced to fix the problem.
? 12:27 www.youtube.com/watch?v=kpFzunNeAaY Aug 15, 2014 - Uploaded by CarsNToys
This was performed on a 1997 Nissan Maxima. ... Code P1320 is indicated when ignition signal in the primary circuit (of the power transistor - built into ..... This test is performed at the ECM inside the car, not at the coil itself.
Here is the definition. The most common cause is a faulty coil.
P1320 NISSAN Description
The ignition signal from the Engine Control Module (ECM)
is sent to and amplified by the power transistor. The power transistor
turns on and off the ignition coil primary circuit. This on-off
operation induces the proper high voltage in the coil secondary circuit.
Read more: http://engine-codes.com/p1320_nissan.html#ixzz23vOHwQBO
The P1320 code is essentially a coil primary voltage problem. This is traceable using a labscope or accurate DVOM and perhaps you can isolate one or two coils that still work but are close to failure...but there is a nissan service message recommending replacement of ALL coils with updated/improved models to prevent this type of failure. TCS/SLIP is traction control. Most likely you have a speed sensor issue. Be aware, some vehicles can falsely illuminate TCS because of low tire pressure in a single wheel.
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