Question about 1997 Saturn SL

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I need to know where to take my ECU to get it tested to see if it is bad or still good.

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You will need to take the whole car to a Saturn dealer or independent garage that can check it over. There is no 'magic tester" to check it.

Posted on Jun 06, 2010


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Posted on Jan 02, 2017

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SOURCE: need location of ecm/ecu on 88-93 buick regal

Its under the hood on the right side of the inner fender well covered up with a black plastic shield

Posted on May 23, 2009

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Oct 29, 2015 | Cars & Trucks

1 Answer

No check engine light, bulb test good

wow, no jeep stated. nor what year, nor what engine.

ill not even beg country (exports are diffr)

below is all ways, discounting bulb tests.

i guess you mean the key on only self test fails with CEL?

ok the PCM glows the lamp at key on, to tell you the PCM is happy and that it passes its rudimentry self checks

basically means its alive.

if the lamp fails to glow ? (all ways, i fix ECU so know this)

  1. power to lamp dead (fuse ) yes fuses can crack (unseen)

  2. lamp bad, (test it with a battery)

  3. cluster wiring to lamp bad, or that wire from PCM to lamp bad.

  4. ECU bad, yes, some bad ECU's can run an engine.

  5. ECU stuck in backup mode, (think limphome but 2 times worse)

in your case id say bad ECU, or bad wire from ECU to CEL.

no year stated, so is it 1988 with that silly junk RENIX EFI with no working CEL or is the unstated car 1993+ where the CEL started working for the first time?

if 93 or newer, we can connect a scan tool, and scan it.

and see , omg , comms are dead, so ECU is in backup mode.

(backup mode is like lawn mower mode, sure it runs but like crap)

ask? can give vivid details of all modes.....

or comm's is ok, and scans and we see DTCs stored and the CEL status in the scanner says ON,"aka, active CEL"

if it says ON< and is not on, then the wire is bad or the

CEL transistor in the ECU blew up. (common with folks using wrong bulb and overheating this poor transistor) replaced many i have.

there are some facts. and is poorly stated. due to NO YEAR !

retired, ET,

Apr 30, 2015 | Jeep Cars & Trucks

1 Answer

2002 rodeo is my obd ground bad my ecu wont communicate and horn wont blow but fuse is good

great question, im ane ECU spirt. )EFI.
what country, nobody ever says, that but gee, the OBD varies buy
Ill pretend USA. /Canada.

In the USA the car has OBD2. and you need a scan tool that works
on 2002 cars.
what engine, some engines have different ECU. radical differ..
they had like 3 engines here, other countries 9.

the scan tools connects to the 16pin, OBD2 connector at dash.
i the car is Can-bus. it needs a can-bus tool, all new tools work on canbus but old ones never do. (i have them back to 1995 and know this)
NON comms and tool is ok, not wrong tool . diagnosis.

  1. Pin 16 not at 12vdc, (blown fuse)
  2. ECU dead, 99% of time blown fuse to EFI. test the fuses to all EFI parts. wiring shows that.
  3. bad wiring to the DCL connector (rare) or from there to ECU
  4. yes, some crappy tools have no ground on both pin 4 and 5, buy a tool that has 2 pins there. OR it will fail on some cars. seen many POS ELM327 tools that do this horror, get a tool called, INNOVA 3160 and stop guessing, this tool works on all cars.
  5. barrow, rent , or buy or ask any sharp mech top scan car , his tool works.
  6. Fuses that look ok can IN FACT be bad, we never assume they ar good we test them. using either method, OHMS or 12vdc on both sides, is better. see? only the voltage matters, all else punts.
  7. The 3.3l communicates on pin 1 and 2..
pin 2 is PCM/ECU. VPW signalling.
and is not can-bus, yet.
simular to this.

top right photos

there you go, you tool must have VPW support on pin 2.

Apr 01, 2014 | 2002 Isuzu Rodeo

1 Answer

Where is the ecu ground on a 2002 4sl rodeo

old post
" ecu wont read bur" ><<<< i can not decode this.
bur, vur,nur, byr,bir, nah, bue, but, ah its BUT? (type analysis, me bad)
ECU won't read ,but fues is good, (test fuse, never just look)
What does wont read mean. by what tool by what actions, by you.?
IF the ECU will not scan with a new scan too the fuses are blown.
period! (or wrong scan tool;) this year is VPW OBD2. (ask)

simple answer, RTM.
long answer.
we cant answer on any car lacking engine size (type) and country.
sorry. can't. and be RIGHT.
in uSA its 3 engine this year.
2.2 L I4
3.2 L V6
3.5 L V6 each can be quite different, post engine.

horn don't blow can be blown fuse. test them. the one marked HORN being first.
can be bad horn relay or bad clockspring. or even a bad horn
to test any horn, HOT wire it. to any 12vdc battery.

ECU issues, gee, what country and engine and what are the Symptoms of your ECU. in details. running or not.
hot or cold, driving or not.

Mar 31, 2014 | 2002 Isuzu Rodeo

1 Answer

Coolant sensor bad

no it does not.
not ever.
it may run a test on the ECT and tell you it reads wrong, sure.
but that ONLY means the test failed, a technician
then tests it by hand , then the wires.
no ecu can tell you what part on any car is bad, ever.
it ONLY a test.

what does ECT read , in ohms cold 3000 or more? what?
then ECT read hot, 300?
if the ECT reads per the FSM chart then its good.
so the wires are bad.
i'ts that simple..
rare but possible is intermittent ECT the cause.

The PCM checks the ECT 3 ways.
1: open
2: shorted.
3: too slow to rise. (bad engine coolant thermostat , and others) ask

so in case 3 , the ECU is not saying the ECT is bad. it dont know.
it only sees it reads wrong, and never ever knows the why.

Mar 19, 2014 | 1996 Jeep Grand Cherokee

1 Answer

My 2005 jeep 4.0l has dtc 2302 , hesitates, replaced pcm still has code

replacing PCM is the last, why do that. which jeep,? wrangler? GC?
ECU is not bad and is almost always (GIGO) garbage in ,nets garbage out, now and for ever....
all most all errors are
1: input errors.
2: or bad output actuators or gee the engine it self.

now lets work
ever see this>? or the FSM, the FSM book is way cheaper than any knee jerk ECU swap.. ouch.
out of FSM. actual
PCM (last ) never 1st ever....
so the coil pack is 4 pins and 3 coils, one one is hot key on.
the other 3 are 3 coils, coil 1 is bad,,
from a pure tech stand point its.
1: bad coil (open or shorted) bad wires, open or shorted or bad ECU.
we never condemn any ECU unless we do the simple lamp tests.
etc. case in point below.
here are the FSM steps, so easy to do.... (truncated, read your FSM)
1: coil 1 removed, connector.
key on is pin 2, 12v, if no fix that first. ( bad power distra. or fuse)
yes, 12v. so.
then, use a test lamp to pin 3 and ground
Pin 3 is COIL 1, !
crank car , does light flash? (any small 12v lamp works) 0.1 amps are less.
1: yes, flash PCM good, coil bad.
test lamp tests continue....
2: stuck on lamp , wire is grounded out or bad PCM (pull PCM C2 conn, ? still tuck on?, yes, bad harness !
3: stuck lamp off? . this is harness wire cut or PCM bad.-
check continuity end to end on this wire. if good , bad ECU.
on a car with nice clean harnesses, no damage to conn?
its a bad coil.
the coil can in fact can be bench tested...
that to, is in the books.
(ohms tests, and make real spark) do so but do not exceed max dwell on the coil "smoke tested boom."( you need a pulse generator , or coil tester)
easy to make them .
there you go.... ECU last. for ever and ever.....

Sep 27, 2013 | Jeep Cars & Trucks

1 Answer

Fuel injector troubleshooting

this is a TOYOTA engine. in truth. what YEAR?
but they all trouble shoot the same. ( i can do them)
TBI or MPI (x4)
the fuel injectors fail in the following ways. there is a test for each and is covered 100% in the FSM. or at Alldata dot com.
but here are the ways, ( ill list all tests only if you ask)

1: clogged (partial to packed full) it has 10 micron screens too.
2; leaking
3: Mag coil open. infinity , some read 10ohms good. FSM time.
any DMM meter on ohms. works.
4: ECU not firing 1 injector. (NOID lamp test)
5: ECU not fairing them all , all 4, this is normal if ECU sees no spark after all you dont want to be like in TV, crash and burn.
6: Injector rail not at 30psi.
0 bad. ,1 bad, 20 bad, 30 good, 60 the regulator is stuck closed
and motor floods x4 cyl.
7: fuel pressure reg, not regulating causing injectors to fail.
8: ECu over injecting, do to bad inputs to ECU.
9: thermostat bad, coolant never holds 180F or more.
causing ECU to go CRAZY, oops,
pyro IR gun to the rescue.

1: are all fuses good.
2: is the CEL lamp on ,key on ,. y/n
3: does the cel go out , running y/n
this 3 are always top of list before any injector fussing.

a better post is , post car spec, and symptoms,
we are blind, less blind, 100x better answers.
post back, EFI is easy with good help.

Sep 23, 2013 | Geo Prizm Cars & Trucks

2 Answers

I have a 2001 VW golf auto with a 1.8L turbo engine. it starts and runs fine for about 5 to 10 seconds and then starts running badly and dies. when running badly, it does not respond to an increase in the...

Sometime unplugging sensors is a good way to find a bad one. If the incorrect reading is being supplied to the ecm, sometimes it can't tell.
When a sensor is disconnected, the ecm knows and uses a default value.
Obviously this doesn't work with the crank sensor.

One thing to check is the connector at the coolant resevoir. Sometimes coolant will migrate through the wires and cause all kinds of trouble.

Jan 30, 2011 | 2001 Volkswagen Golf

1 Answer

I have XG 300 2001 Model which is no longer starting due to replacement of engine set, when I ask to know the problem my mechanic said it is the ECU that is faulty and that it should be replaced with new...

There is a way to test the ecu to see if it's working properly. Go to a different mechanic and ask them to test the ecu.It is also possible that the icm ( ignition control module) is faulty. When an engine is changed out, especially with a used engine, the ecm is bad and /or your old distributor was used and the icm burnt - this is not uncommon and may not be by fault of your mechanic. A special scanner is needed to test these components.

Nov 03, 2010 | Hyundai XG300 Cars & Trucks

2 Answers

No spark and fuel pump wont work do 2 flood damage

I don't know how bad the flood is, but if its high enough your ECU may have also got damage. the ecu locate underneath the dashboard upper left side corner near the foot fuse box. if it has come in contact with the water I can assure you 99% you will need to replace it. the ECU is the brain to the car, water can also short out the ECU if one try to start the car while all the wires and connectors are still soak and wet. If you have to replace the ECU, get it from the junk yard or ebay, new from the dealer will cost you arms and a leg. In this situations you will have to narrow it down one by one, you starting off with a good idea seeing if you getting sparks and fuel. 1st I would check and see if your ECU is good and in working condition, there is no way you can bench test it at home, I don't know of any place that offer bench testing, if you find one, it will cost you about 75-100 bucks after shipping and handling. you can actually get one off ebay for 50-60 bucks used. If you think the ECU is still good, then check the cam and crank senors, one turn on the fuel pump and the other turn on the sparks. check the basic things like fuse and relays, plugs, caps, rotor and coil. for beginners, I would go down to any auto parts store and pick up Haynes auto repair book for 20 bucks, its a great bible include pictures step by step and its worth the investment. hope that help some good luck!

Oct 03, 2009 | Hyundai Elantra Cars & Trucks

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