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How can I check a SMEC at home to varify if it is good or bad?

I am not able to check engine codes anymore. read-out gives me link-error. No spark control. Engine kill relay will not energize.

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  • Cars & Trucks Master
  • 21,873 Answers

Well that all points to a faulty computer.
You could buy a used part from a salvage yard, or do a pin test on the one you have. You'll need a shop manual to get the wiring diagrams and specs.

Posted on Jul 17, 2013

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Posted on Jan 02, 2017

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SOURCE: chrysler 3.3 vin r v6 mini van, starts then dies

Charlie. You have replaced the ECM on your van?.
Kedwin,, Your problem is, the computer on that 3.3 L.
Need to be programed with the VIN nember of your car.
The Antitheft System will disable the injectors due a incorrect VIN, Bucause the body computer is not recieve the correct pasword between 5 seconds after start up.
YOU have 2 options. 1 get a ALOHA Smith. some of they have the computer required to program ECMs.

The other option is: Get a new ECM from the dealer, They will program if ask for that.

NOTE:::::: Other way is . Put the body control module with the computer from the same car.

OK... I hope this work for yours.
If NOT letme know I can look for more information.
Thank you.

Posted on Jul 17, 2008

justuscc
  • 360 Answers

SOURCE: car will just turn over

main relay contacts get burned up...... common on the hondas its under the drivers side dash

Posted on Oct 10, 2008

  • 1 Answer

SOURCE: Check Engine LIght Problem code P1491

Don't rush to replace the fan itself until you have tested it. Check the fan relay and relay fuse inside the vehicle. Hopefully it will be just a failed relay and replacement ($12 at dealer) or/and an inexpensive 10amp or 30amp fuse. There can be multiple issues causing this code.

In my case, the fan relay failed (burnt). 2000 Dodge Durango. The PCM was also damaged and requires replacement, awaiting delivery. A remanufactured PCM can be purchased online for substantial less than at the dealer. We tested the fan by supplying power directly to the fan and it runs fine. We had to remove a cover (easy to remove) under the vehicle near the fan to gain access to the connector Use a fused link for testitng to prevent damage during the test. Using a multimeter, I found power 12.5volts from the 30amp fuse circuit which supplies the power for the fan, 12.5 volts from the PCM circuit with the key on, but only 5.16volts from the 10amp fuse circuit with the key on. A continuity test showed the 10amp fuse inside the fuse box inside the vehicle was good. The 30amp fuse in the power distribution box was good when tested for continuity. Checked resistance on all curcuits and they were well within limits. I also checked the wiring to the fan for continuity and resistance. After my tests were completed, a Dodge technican concluded the PCM is bad and is not grounding the circuit as it should. If you want to troubleshoot this yourself, see if your local library has access to ALLDATA which will have diagnostic information and the diagrams of the circuit involved. A Haynes manual for the vehicle, I purchased one at Autozone, can be helpful also.

Posted on Jul 27, 2009

emissionwiz
  • 76118 Answers

SOURCE: 2006 Cobalt 2.2 litre has check engine light come on, then "engine disabled"

That code dsoesn't 100% mean the sensor is defective, other factors can set it. See list below.
Possible causes- Camshaft Position Sensor harness is open or shorted
- Camshaft Position Sensor circuit poor electrical connection
- Faulty Camshaft Position Sensor
- Faulty starter motor
- Starting system circuit
- Dead (Weak) battery
P0601 CHEVROLET - Power Control Module Internal Fault

Cause: Faulty PCM. (Powertrain control module)

Posted on Jun 14, 2012

  • 1 Answer

SOURCE: 2000 jeep wrangler won't start, good crank, no bus

Check fuses first, but could be needs new CPU

Posted on Jun 15, 2012

Testimonial: "Thanks for your help, we checked the fuses even swapped out the relays. The CPU was a thought but someone else tried it and it didn't work. Might still try it though. Is there any other symptoms that would indicate the CPU is bad? We changed out the ignition switch, 135.00, changed the CPS, 42.00. I hear the CPU is about 150.00. When we run the tester it comes back with no error codes."

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1994 Geo Metro will not start


all spark plugs dead. and at the main coil?
in this case after fuse (test them , ones that look good can be bad)
these steps work or all EFI cars made.
first is the rotor spinning cranking, if not the cam belt snapped!
a 1 second check, do you try to run 60k mile belts 200k ?


  1. CEL lamp on? key on? no crank? y/n,, if no the ECU is dead. or lamp burned out, we fix this FIRST. for next tests.
  2. I insert the diagnostic jumper clip (paper clip)
  3. the CEL now flashes codes, write them all down.
  4. I then crank for 5 seconds. and release the key.
  5. The ECU then reports live codes. beyond above stored codes.
  6. The ECU is very good at finding bad crank or cam sensors dead or even missing pulses, 1 in 10 lost. trust it, on all cars ......
  7. if no sensor code errors or spark bad errors then do the next things.
  8. The ecu also reads back the Tacho signal and will report dead tacho, sig, the ECU creates this and is the COIL drive signal to the ignition coil via the IGNITOR device.
  9. If the ignitor dies, or the coil primary opens, (dead Ign.coil) then the ECU see this and gives you Spark fail codes, cranking only!
  10. if you get far with a dead ignition coil, the ignitor is bad or the coil assuming coil even has power 12vcd key on.
this is all in the FSM, if you read it.
as is the Ignitior tests, and the coil tests.
The FSM is an amazing thing if your read it.
buy one.

ECU = engine brain, or EFI brain
EFI = eletronic fuel injection
CEL is the check engine light also called SES or MIL.
your ECU is OBD1 and no scan tool works .
only the winky blinky light.

Mar 04, 2014 | 1994 Geo Metro

1 Answer

Need to check engine codes


Hi there:Code 12 - Memory standby power recently lost - Possible Causes

Battery or power line recently disconnected - This code is normal if the electrical system has been worked on or the battery has recently been disconnected. It will be removed after 15 ignition switch on/off cycles.


Low system voltage, bad battery or battery terminals - If the system recently had a power drop (due to a dead battery or bad alternator), this code will appear. If the battery terminals are bad and the engine was jumped, this code will appear. See the Diagnosing Your Charging System page for more information.


Bad connection or wiring - Check the wiring and connections between the battery, power module, and logic module (or SMEC). Check all fusible links and power connectors to the battery. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.

Code 32 - Logic module did not see a change in air/fuel ratio when EGR circuit was activated - Possible CausesEGR valve stuck open or closed - If the vehicle fails emmisions, then the valve may be shut. If the enigne runs poorly at low rpm or at idle, the valve may be stuck open. It may be the valve or the transducer valve. Test the transducer valve vacuum output. At idle, the transducer valve vacuum should be mostly bled, and there should be very little, if any vacuum at the output. When the engine is revved, the vacuum should increase. If the transducer is functioning properly, replace the EGR valve.

Bad EGR solenoid or Canister purge/EGR solenoid - The solenoid is located in the right, front fender next to one to three other solenoids. See the Understanding Solenoids page for information about how to test and repair solenoids.


Bad connection or wiring - Check the wiring and connections between the solenoid and the logic module (or SMEC). Clean and regrease any corroded connectors with dielectric grease and repair any shorts.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Aug 20, 2012 | 1990 Oldsmobile Silhouette

1 Answer

Grand cherokee error code 13,16,24,27,36,51


Hi there: Definetivelly you have a problem with emission and injection syste,, check this code descriptions...

DTC 13 - MAP (Manifold Absolute Pressure) sensor pneumatic failure: sensor output does not change
Power loss light: On
Limp-in mode: TPS and engine speed used as an indication of manifold pressure

Possible Causes:
Broken or disconnected vaccum line - Check the vaccum line leading from the MAP sensor. On '87 and later engines, the sensor is located on the right shock tower and the vaccum line often gets pulled or pushed off. Replace the entire line with a piece of 1/8" I.D. vaccum hose making sure to provide enough slack in the line.

Bad Baro-read solenoid - The barometric read solenoid may not be operating. Try bypassing the solenoid, connecting the MAP sensor directly to the manifold to see if the engine runs better (this may not prevent the code 13, however). If not accompanied by a code 37, you can try to repair or replace the solenoid. See the Understanding Solenoids page for information about how to test and repair solenoids.

Moisture in MAP sensor - If this mostly occurs old cold weather, then you may have water that is freezing inside the sensor. This is a common problem on vehicles that have the sensor located on the logic module. Remove the sensor and bring inside to warm up. Shake any droplets out of the sensor and set it in a warm, dry place for a day or so. Don't try to take the sensor apart because you may destroy it. Check all your vaccum lines because a vaccum leak would be the most likely cause of water entering the system. If your MAP sensor is located on or near the logic module, you may wish to consider moving it under the hood on the right shock tower. All 1987 and later models were set up this way to prevent moisture collection in the MAP sensor.

Pinhole leak in Fuel Pressure Regulator - Occasionally, a small leak will develop in the fuel pressure regulator diaphram that allows fuel to enter the vacuum system. This upsets the response of the vacuum system, triggering this code. Check for the presence of fuel in the vacuum line to the fuel pressure regulator. If fuel is present, replace the regulator.

MAP sensor failure - A bad MAP sensor will usually cause a code 14, so this is not as likely to be the cause of a code 13. But if it comes down to it, replace the MAP sensor which is located on the right shock tower on '87 and later vehicles or in the logic module on previous vehicles. Damage from freezing water can destroy a MAP sensor.

DTC 16 - Loss of battery voltage detected with engine running
Power loss light: On
Limp-in mode: 25% alternator field coil duty cycle

Possible Causes:
Blown fusible link to power module (or SMEC) - Check the only white fusible link (may look grey if dirty) by tugging on it. A good link will feel solid while a blown link will stretch like a rubber band. It is the white link on the two-link circuit (not the four or five link circuit). This link supplies power to the ASD relay and the voltage sense input on the logic module (may be accompanied by a code 42). See the Fusible Links page for more details.

Bad connection or wiring - Check the wiring and connections between the alternator and the battery, power module and the alternator field coil, and the voltage sense line through the power and logic modules.

Alternator failure or bad voltage regulator circuit - See the Diagnosing Your Charging System page.

Diagnostic Method
Trigger Parameters
- 60 seconds after engine startup
- Voltage sense input is below 8.5V
Results If Component Fails
If the voltage sense input is between 4V and 8.5V, the logic module will full-field (100% duty cycle) the alternator field coil for 20 seconds. If the voltage sense input is still below 8.5V, the system enters limp-in mode, the power loss light is turned on, a fault code 16 is stored, and the alternator field coil driver will enter a fixed, 25% duty cycle.

If the voltage sense input is below 4V, the system enters limp-in mode, the power loss light is turned on, and a fault code 16 is stored. The alternator field coil driver will enter a fixed, 25% duty cycle to prevent overcharging of the battery, but allow the vehicle to operate.


DTC 24 - Throttle position sensor (TPS) signal is out of range
Power loss light: On
Limp-in mode: MAP sensor is used as an indication of thottle position

Possible Causes
TPS failure - The TPS is located on the throttle body on the opposite side of the throttle cable. Turn the engine off, disconnect the sensor and test it by connecting an ohmmeter (preferably an analog one) between the center and either outside pin of the sensor. Slowly open the throttle all the way and then slowly close it again. The ohmmeter should show a constant, smooth change in resistance as the throttle is moved. If there are any jumps in reading or no change in reading at all, replace the sensor. If the sensor seems ok, reconnect the sensor cable and turn the ignition on. One outside wire should be 5V, the other ground. The voltage on the center wire should vary as the throttle is opened (about 0V closed, 3V wide open). If power or ground is not present, check the wiring.

Bad connection or wiring - Check the wiring and connections between the sensor and the logic module (or SMEC). Clean and regrease any corroded connectors with dielectric grease. Check connections if there is no power or ground, or for shorts if there is power and resistance, but no output.

Diagnostic Method
Trigger Parameters
- Sensor output less than 0.16V or greater than 4.7V
Results If Component Fails
Fault code 24 is stored, the power loss light is turned on, and the logic module will enter limp-in mode. The logic module will then use the MAP sensor as an indication of the thottle position. A MAP sensor voltage less than 2.0V is considered closed throttle and a MAP sensor voltage greater than 2.0V is considered wide open throttle (WOT).


DTC 27 - Injector driver circuit 2 open or shorted
Power loss light: Off
Limp-in mode: None

Possible Causes
Bad connection or wiring - Check the wiring and connections to injectors 3 and 4 in the injector harness (above the fuel rail) and between the harness and the power module (or SMEC) and the injector contol lines between the logic module and power module. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.

Injector driver transistor failure - Check the injector signals coming from the power module (or SMEC). They should rise to about 12V when the injector is off and drop close to 0V when the injector is on. If they are out of spec, you may need to replace the power module.

Diagnostic Method
Trigger Parameters
- Near 0V or near 12V not detected when the injector driver is turned on or off, respectively
Results If Component Fails
Fault code 27 is stored.


DTC 36 - For MPI N/A engines

Description: Air switching solenoid circuit is open or shorted
Power loss light: Off
Limp-in mode: None

Possible Causes
Bad connection or wiring - Check the wiring and connections between the logic module and the solenoid. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.

Bad solenoid - The solenoid is located in the right, front fender next to one to three other solenoids. See the Understanding Solenoids page for information about how to test and repair solenoids.

Diagnostic Method
Trigger Parameters
- Near 0V or near 12V not detected when the solenoid is turned on or off, respectively
Results If Component Fails
Fault code 36 is stored.


DTC 51 - Oxygen sensor output indicates lean too long
Power loss light: Off
Limp-in mode: Engine allowed to run rich, but prevented from running lean

Possible Causes
Bad oxygen sensor - Replace the sensor which is located on the turbo housing near the down pipe (for turbo) or on the down pipe near the exhaust manifold.

Bad connection or wiring - Check the wiring and connections between the sensor and the logic module (or SMEC). Clean and regrease any corroded connectors with dielectric grease and repair any shorts. Look for melted wire insulation near the exhaust manifold. A shorted connection to ground or any positive source will cause this fault code.

Low fuel rail pressure - See the Diagnosing Your Fuel System page.

Diagnostic Method
Trigger Parameters
- In closed-loop
- Sensor output indicates lean for more than 715 seconds (11 minutes, 55 seconds)
Results If Component Fails
A fault code 51 is stored, the circuit stays in closed-loop, and the logic module will still monitor the oxygen sensor signal. If the condition persists for four times what it took to set the code, the logic module will allow the engine to run rich, but prevent it from running lean.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Dec 21, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

1988 dodge dakota v6 car ran until I changed plug wires. Looked at all connectors I may have bumped and disconnected found nothing loose. Now no power to ignition coil or fuel pump. Have engine codes 11,...


Start with the basics. Varify that you have 12V at the J1 (solid red) at the SMEC at all times. Then check for J2 (blue or blue/white) when ignition key is on. If you don't, tug on all your fusible links. If they pull apart, you probably have a short to ground on that circuit. Also check all the grounds at the smec. They are black and black with white trace. Make sure they have =< .5 ohms to battery negative terminal. If all of that is well and good, make sure you have the correct 8vdc and 5vdc coming from the smec at the applicable places like the HEP, TPS, CTS, etc.

Jul 28, 2011 | 1988 Dodge Dakota

2 Answers

S430/102k, mi/ Wouldn't start. Told to put car in neutural and 'rock it' 'Rocked' car, put it in park and car started and 'check engine light lit'Prior to the no start, wife...


Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.


To confirm the problem, the basic troubleshooting is required.


Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

---------

This will help.

Thanks

May 18, 2011 | Mercedes-Benz S-Class Cars & Trucks

1 Answer

How do I determine which coil is bad without a "check engine" light?


Run engine to normal operating temperature, Turn engine off remove one spark plug wire from spark plug. restart engine.Where protective gloves, hold the end of the spark plug wire approximatly one quarter of an inch from engine block or exhaust manifold, you should not only be able to see the spark arc to the engine but hear it as well,as a pronounced snap.Repeat for each cylinder.If you find a bad coil before you have finished the remaining cylinders( NOTE ) cylinder and continue on until all cylinders are checked, because there could be more than one cylinder down at the same time. Before replacing any bad coils make sure you check the wire harness going to each bad coils connection, burnt, missrouted,unpluged at connector and propper voltage supply at plugin connector.Once this is varified replace coil and check for a good spark.I hop this is helpfull for you,good luck.

Dec 07, 2010 | 1998 Ford Expedition

1 Answer

I had a cylinder 5 misfire on my 2002 chevy Camaro v6 3.8. I changed the spark plugs and the spark plug wires and the car runs great, until i give it alot of gas. If i accelerate too quickly now the car...


sounds like spark plug coil is bad. had the same problem on my truck also. check wich cylinder is misfiring and replace the coil and maybe the plug also. if the plug looks good leave it. autozone can give you a read out. when checking the coil, if it has a rust color to it its bad and needs to be replaced. 02 z28

Jul 07, 2010 | 2002 Chevrolet Camaro

1 Answer

HELP... CODES FOR 1996 DODGE GRAND CARAVAN SE. CODES 12, 22, 11, 44, 55. WHAT DO THES MEAN AND HOW TO FIX IT.


11- no start since battery disconnected.
12- battery has been disconnected recently.
22-Coolant temperature sensor, bad connection or faulty.
44-signal to smec (engine computer) was interrupted, or is not present.
55- is end of codes.

What exactly are you experiencing as far as starting and driving goes.
The only code I see right now that I would worry about is the coolant temperature sensor, if you are experiencing poor running, starting etc.
The signal to smec, may have been a one time thing, if vehicle runs.

Feb 02, 2010 | 1996 Dodge Grand Caravan

2 Answers

What is it


It's really hard to give a specific cause for something like this with out more information. If for instance it is a miss-firing cylinder, there are several possible causes for it ranging from a bad spark plug, bad 02 sensor or even a burnt valve. However there are a few items you can check and maintenance the can be preformed that may help out. At the very least it will eliminate them as a possible cause.

The most common cause of rough idle is worn out components. These include air cleaner, spark plugs, wires, cap and rotor. These are all items that should be replace at the time of a tune-up. If it hasn't had a tune in a while, that is a good place to start. This will also give you a chance to inspect the spark plugs. The condition and color of the electrode at the bottom end of the plug will give you a good indication as to how well the engine is performing. The first link I provided below will give you a way to compare what your plugs look like and what would cause that condition. Included with the items for a general tune-up, A good fuel injector cleaner should be added to a couple tanks of gas as well as a injector cleaner that runs through the intake manifold.
During the tune-up you should inspect all the vacuum lines and listen for any leaks while the car is running.

Before doing anything that's unnecessary it's a good idea to check the error codes. You do this by turning the ignition key on-off-on-off-on within five seconds. Only turn the key to the on position not the start position. If your odometer is digital the codes will be displayed there. Examples are P0303 and P1283. If your odometer is mechanical the codes will be displayed in a series of flashes, a pause and more flashes from the engine light. To be honest it's much easier to take the car to someplace like Auto Zone where they will read error codes for free then dealing with the flashing pause system. After you have the code (if any), you can check them at the second link I added below. Make sure to check both the Dodge specific codes and the generic codes.
These codes help by giving you specific information on any system that is not functioning properly.
Once you have recovered the engine diagnostic codes if any or you are at all unsure of any part of this solution please re-post.
Hope this helps.

http://www.engine-light-help.com/dodge-check-engine-light.html
http://website.lineone.net/~srbrock/01a.jpg

Sep 24, 2009 | 2000 Dodge Neon

4 Answers

No spark and no gas now what


Hi,

If you have no spark and no fuel pump operation,I would strongly suspect the Auto Shut Down relay.
The Auto Shut Down (ASD) Relay supplies power to the ignition coil, fuel injector, electric fuel pump, and the oxygen sensor heater element as long as the key is in the START or RUN position and the Single Module Engine Controller (SMEC) is receiving a reference signal from the distributor.
If the SMEC receives no distributor reference signal for two seconds or more the SMEC interrupts power to the ignition coil, fuel injectors, electric fuel pump, and the oxygen sensor heater element by removing the ASD relay ground.

Thanks for contacting Fixya.

Jul 26, 2009 | 1996 Jeep Grand Cherokee

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