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How do i erase a code number with out using a code reader scan tool?

The check engine light is on i did a test on the coil pack so now i need to erase the code number with out using a scan tool.

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Mark Schmit

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Usually you can remove the ground cable from the battery for about ten minutes the error will clear unless the problem that caused the error still exists.

Posted on Oct 18, 2016

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3 Answers

How do you get engine fire to the coil packs on a 2.0 engine


in all cases
check fuses, and scan it.
and do the test correctly , 2 coil packs are not test like 4 packs. not at all.
The J20 engines
so what country?
ours use 4 coil packs in USA.
outside USA some use 2 PACKS (wasted spark packs)
we cant guess what's under your hood nor, what EFI system is there. ever.
so ill answer for the USA setup 4x cop coils
C.O.P, coil over plug, x4
check fuses first (ig-coil and FI fuse)
check that Check engine lamp glows key on, if not power (elect) lost to PCM/ECU. (fuses blown)
ours is OBD2 compliant so all scan tools made here work.
next, is scan it, while cranking and in every case it tells you why.
the CKP sensor (crank) is behind the flywheel, (yes, transmission pulled.
the CMP sensor (cam) is on the left rear of cam. DOHC J20 engine
do not fiddle CMP, or lose spark timing. (compounding issues)
if you are compelled to fiddle about, match mark it first with a center punch tool or scribe. some later j20 cars the timing freeze jumper is in the factory scan tool only and no on left strut DCL conn. (mark it first)

that is it.. just sold all my suz. they are DOA here."bugged-out"

now my quesitons.
all 4 spark plugs dead.?
or just 2 (2 pack engine)
if just 2, then is it wasted spark 2 coil pack system
then yes, ? then use 2 spark plugs at one time, to test.
not 1 ever.
ask. or tell , or show a photo of your engine, if you want exact answers,
hints, (yes i travel outside usa and see all this...)
wasted spark has actual, old school spark HV wires on top of engine
some J20 have just 2 wires. and other half are direct fire.de791219-83fd-4c6f-8010-585464c0182d.jpg

Feb 29, 2016 | 2002 Suzuki Grand Vitara

2 Answers

How to check a ignition coil pack to see if its good,


the coil does not crank the engine , the starter does that, sorry.
(if you ever had to hand or foot crank and engine , youd under stand that. (like motor cycles or boat engines, or per 30s cars.)

in fact will crank all day with no spark parts on car..

x2, the scan tool does tell you why there is NO STARTS, CRANKS OK. The pcm can detect, one missfire in 10 cmp;ckp signals.
  • CRANK FOR 5 SECONDS
  • release, key
  • scan tool has DTC errors?, read the believe them.
no engine stated of 4 or more,

U checked everything but spark,
why, check spark at all cylinders, all most fire or the engine will not run or stall.
That test be first, if not starting (AFTER SCAN TEST)

IF NO spark fuses are next , not last.
lets do no start fails tests. (cranks perfectly 200 to 300 rpm)
  1. : check fuses
  2. key on, CEL lamp must glow, if not , ECU fuse blown.
  3. crank with scan tool , see P03xx DTC errors, see RPM dead.?
  4. check for spark? got spark x4 or times number of cylinders?
  5. got spark try test fuel now, runs for 3 seconds?
  6. yes, runs on test fuel now means lost fueling
  7. no, dont run on test fuel, means, 1 to 5 done wrong above or engine compression bad.
  8. bad fueling, huge number of tests. check fuel pressure now.
confused, try a shop and watch them, learn.

Jan 12, 2015 | 2005 Suzuki Forenza

1 Answer

Jeep grand cherokee crankshaft position sensor replaced but still given a weak spark


the coil. ? older post.
the PCM reports even one drop out of 10 , on the CKP or CMP sensors. 99.9% of these changed are good.
why not tell me what you have,? full symptoms and evidence.
got P030x misfiring? are you even using a scan tool,? or working blind.
may be its the coil.?
can can you feel the misfiring.c
can you see the engine shake? all of this is evidence.
do not miss out on that.
does the scan too shop pending misfire codes?
stored codes, or codes while driving, learn to use the scan tool.
do a 60k mile tune up yet?
your engine is not COP coils like the V8
its COIL rail that is a COIL pack with 3 coils inside
that runs 2 sparks each called WASTED park.
so did you try new sparkplugs(dah)first then new coil pack wires HV
next , then a new coil pack last.
start with the cheap spark plug and wires, (called a tuneup)
then pop for coil pack./
misfire can be clogged or leaking injectors too, and that ill skip
with out you using the scan tool fully.

Mar 29, 2014 | 2002 Jeep Grand Cherokee

1 Answer

When i start my 2001 kia optima my car putters. i changed my bad o2 sensors. but not sure what the problem is. and when i drive sometimes it jerks. what could the problem be


The spark and fuel system needs to be inspected.--------- The spark plugs are getting fouled or very loose, can cause sputtering problem.Inspect the spark plugs and coil packs.The spark plugs gets power from coil pack.If the spark plugs are very old and dirty, then it needs to be replaced.--------------- The **** problem also relates to faulty worn out spark plugs or clogged fuel filter or low fuel pressure or problem with ignition coil pack.----------- When coil pack stops giving power to spark plug the car will **** while driving.---------- So very first thing you get tested is spark plugs and ignition coil packs.If they are tested good, but looks very dirty/ worn out, that can also be the reason.----------- But if spark plugs and ignition coil tested ok and cleaned properly, but still same problem, then get fuel pressure tested.If fuel pressure is low, the fuel pump and fuel filter are the cause of problem.----------- ------------------ Also one more thing, " IS there check engine light coming ON dash" ? If yes, then get the car scanned at autozone service center.Its absolutely free to get car scanned at autozone.They do it for no charge.------- In scanning you will get error codes, as per error codes, it will point towards faulty part, causing this sputtering and jerking problem.----------------- But if there is no check engine light ion dash, then get the above mentioned possibilities checked.That will help.Thanks.Helpmech.

Aug 05, 2011 | 2001 Kia Optima

2 Answers

How to reset engine warning light on 2004 mini cooper s JCW?? Cheers Colin Metcalfe


YOU CANT RESET ENGINE WARNING LIGHT UNTIL YOU CODE SCAN FIX THE PROBLEM.BECAUSE IF YOU HAVE A BAD SENSOR THE CHECK ENGINE LIGHT WILL STAY ON.ONCE YOU REPLACE THE BAD SENSOR YOU NEED A CODE SCANNER TO ERASE TURN OFF CHECK ENGINE LIGHT.

May 30, 2011 | 2004 Mini Cooper

1 Answer

Check engine light won't go off. when diagnostic test is run, I get 2 codes: 1633 and 1633pd. How can I fix this?


Check engine light will not go off untill you fix the problems, or if you erase the codes. Go buy a haynes or chiltons manual for your particular car or truck. Look in the emissions section of the book, and it will give you all code info.

If you want to reset your check engine light with a scan tool, you must hit erase after scan is complete.

Or, unhook your negative battery connection for about 10 minutes.

If your check engine comes back on, then you`ll need to fix the problems.

Apr 15, 2011 | Ford F-250 Cars & Trucks

2 Answers

Kinda putters then engine light came on and its giving me a code p0303


p0303 is a mutible engine misfire on number 3 cylinder. the best fix,

A code P0303 may mean that one or more of the following has happened:

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • but first of all check the wires and sparkplugs first!

Feb 18, 2011 | 2001 Jeep Grand Cherokee

2 Answers

How do you reset the service engine light?


Locate the diagnostic connector. On the 1997 Nissan Maxima the connector is located in the OBD2 standardized location under the driver-side dash, slightly to the right of the steering column. With the ignition key in the "OFF" position, plug the connector of the scan tool into the diagnostic connector of the car. Turn the ignition key to the run position but do not start the engine unless instructed to by the scan tool.

Turn the scan tool on and select "Global OBD2" from the main menu. Select "Diagnostic Trouble Codes" from the first sub-menu, and then "Read Trouble Codes" from the second sub-menu. Write down all listed codes and their descriptions before erasing them. This will save time if you must perform additional diagnostics.

Press the back button on the scan tool until the second sub-menu is displayed, and select "Erase Codes" or "Clear Codes," depending on the manufacturer of the scan tool. A message will appear asking you to confirm your desire to erase the codes and other stored data. Select "Yes". The scan tool will alert you when the codes have been erased.

Test drive the vehicle to verify the repair is complete. The 1997 Nissan Maxima on-board computer will run a series of tests on the systems in the vehicle, including emission control devices. To complete these tests you must take two test drives that include a variety of driving conditions, with a 2-minute cool-down between each test drive. If the service engine soon light does not come back on during these two test drives, you have completed the repairs and the reset.

Oct 25, 2010 | 1997 Nissan Maxima

1 Answer

2001 20 vw beetle engine managmemt light keeps comming on told it was misfire on no4 all new plugs light reset run for three days light back on HELP


Certainly the person telling you this had a scan tool but did not investigate thoroughly why it was misfiring and only suggested a bad plug in cyl #4. A bad plug is usually the case maybe from a mixed matched set of plugs. Having a distributor-less system some people miss to check the ignition coil pack. Technically you can't correct a problem by resetting it's warning indicator which some people think they have a red FIX button. In this case the engine management needed 3 start up cycles to verify if problem was fixed after erasing the DTC stored in the system, hence the 3 days. The ignition coil pack could be going bad or the individual ignition wire is. Is this an AEG engine code?

Oct 16, 2009 | 2000 Volkswagen Beetle

3 Answers

2001 Pontiac Bonneville. Service engine soon light stays on. Went to Auto Zone and had them check out why the service light stays on, does not flash. They suggested to disconnect the battery, replaced fuel...


The scan tool that they used at autozone should be able to erase them and tell you whether they are existing codes or just stored. Hope this helps.

May 10, 2009 | 2001 Pontiac Bonneville

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