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How do i test power transistor unit j723t

Fire to the coil not out

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: 1988 audi 80 4cyl. no spark from coil,new coil fitted,coil lead

hi i have a coupe 1994 have same prob told by audi to replace the distributor as was common failt on audi's i have replaced new leads ,coil ,dissy cap, and arm ,still the same awaiting on distributor to see if this works hope this helps

Posted on Oct 18, 2009

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Is there a circuit breaker or fuse to replace to solve this issue?


When you turn the key on the instrument cluster has no lights come on ? The head lamps don't work ? plug 2 and 5 where not firing and was told to reset computer by disconnecting Battery.If 2 & 5 are the only ones not firing ,disconnecting the battery isn't going to change that . The ignition module has burnt out transistor . If there was B+ voltage before you disconnected the battery you have a bad connection . Check your connections , cables ! Unless you shorted something . Do you know how to do automotive electrical testing using a voltmeter and a electrical power distribution diagrams ? This video on diagnosing coil drivers ( transistors ) is on a saturn 2.2 4 cylinder , doesn't matter testing the transistor is the same for your vehicle .
2004 Saturn Ion 2 2 Misfire Case Study P0300 you look at some other ones . Here watch this one too .

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Did you replace the coil #2 ? still have the code ? Have seen this be the coil driver inside the PCM . A transistor supply's a ground for the coil , Coil breaks down inside an sends 40 K volts to the pcm . Video's on youtube ,checking PCM dirvers , #2coil primary/secondary unit malf.circuit low input . How to test computer transistor driver without scan tool


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My 1997 nissan largo has no spark, 2.4 petrol motor... appears to have good wiring and power at both the coil and at the distributor plug in points but no spark, can you help


Power Transistor Test and Ignition Coil Test 2.4L Nissan ...

easyautodiagnostics.com > Nissan > 2.4L
Mar 9, 2010 - If your Nissan Altima CRANKS but does NOT START or runs with a misfire... this is the article that will help you test and diagnose your Altima's 2.4Lignition system (1993-1997). ... With the tests in this article, you'll be able to test and diagnose: A BAD power transistor (ignition ...

Oct 28, 2015 | Nissan Cars & Trucks

1 Answer

What would be the problem 1998 toyota camry 4 cylinder 1 of the coils is not firing


if you have 12v and a switching signal but the individual coil wont fire,
verify its the coil by switching it with another cylinder. if the problem follows the coil to the other cylinder you must buy one

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Coil wont fire all three wires have power but no fire to plugs replaced twice


Crank sensor if it has one,timing belt skipped is a possibility,and always the dread security key problem.don-ohio

Apr 01, 2013 | 2001 Ford Focus

2 Answers

Power to the coil and power to the distributor but not firing need help


As long as your getting power at the black/red wire at the coil (battery power when the key is swtched to the on/run position, I would check the ignition control module. I think Nissan calls it a power transistor. In any case it is mounted on a bracket attached to the air filter housing (see picture below). the bottom picture is a picture of the connector/plug at the module. Using an ohm meter check terminal A & B on the module. If you any resistance at all the module is good. If you get 0 ohms then it is bad of course. Those units are about 100 dollars and it sounds as if you are spending money on parts that aren\'t needed. Nissan is pretty good about testing procedures on thier elctrical componants so I would suggest diagnosing completely and then repair once and for all. If you find this unit is good and you need more testing procedures you can reply/comment here and I\'ll do my best to help figure this puzzle out. Hope this helps.......


2_20_2013_5_01_15_am.jpg

Feb 20, 2013 | 1995 Nissan Altima

1 Answer

98 mercury villager no start , code P 1320


Here is the entire description for the code -

When is the code detected?When the ignition signal in the primary circuit is not sent to Engine Control Module (ECM) during engine cranking or running.

Symptoms- Engine Light ON (or Service Engine Soon Warning Light)

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
Possible causes - Faulty power transistor unit built into ignition coil
- Ignition primary circuit is open or shorted (circuit to ignition coils)
- Ignition primary circuit poor electrical connection (circuit to ignition coils)
- Faulty ignition system condenser
- Crankshaft position sensor circuit

help.png Help with this Tech notes 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 that what 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.
Read more: http://engine-codes.com/p1320_nissan.html#ixzz2EJsrz4BZ

Read more: http://engine-codes.com/p1320_nissan.html#ixzz2EJsktmXX

Dec 06, 2012 | Cars & Trucks

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