Question about 1996 Dodge Dakota

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How can I check to see If a SMEC is bad without going to major repair shop? Can"t spend money on replacement without being sure.

Hand held, for checking faults, gives me link-error. unit has worked in the past. Kill relay will not energize. have no engine icon on dash anymore. have also tried ignition on / off system to retrieve any codes or clues.

Posted by Anonymous on

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5 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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hotrodshop
  • 106 Answers

SOURCE: I have a 2003 dodge ram 1500 with a V-8 4.7 engine

The leak in your evap system is very small at .020. It is more than likely a small split in a hose somewhere. The cap is probably ok, we rarely find a bad one. If it is a small split in a hose it will only get larger over time. Here is the factory info on the code. We have found that alot of these leaks are from a small hose on the evap canister under the vehicle, but with out looking at your vehicle it is hard to say. If the leak goes away or is no longer large enough to be detected, your light will go out after a few days. These leaks are emmissions related and will not effect the integrity of the vehicle. I would have it checked and corrected if the light stays on at your convienience.

Symptom List:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0442-EVAP LEAK MONITOR
MEDIUM (0.040) LEAK DETECTED.
When Monitored and Set Condition:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: If there is a leak larger than 0.0409 and smaller than 0.0809 in the
evaporative system.
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0809 in the evaporative system.
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0209 and smaller than 0.0409 in the
evaporative system.
POSSIBLE CAUSES
LEAK AT GAS CAP
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
VISUAL AND PHYSICAL INSPECTION
VERIFY EVAPORATIVE EMISSION SYSTEM LEAK
EVAP PURGE SOLENOID OPERATION
INTERMITTENT LDP MONITOR FAILURE
EVAPORATIVE EMISSION LEAK DETECTION
GAS CAP
LDP COMPONENT LEAK

Posted on Jun 12, 2009

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  • 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

  • 1986 Answers

SOURCE: My 2002 Dodge Grand Caravan eL has been acting up

It may be your TPS may be faulty. It may also be your EGR, but the symptom with that would also include jerking and bucking of the car.

Posted on Aug 21, 2009

  • 8 Answers

SOURCE: 2002 Dodge Durango 4.7L V8 Check Engine Codes

1st try and search for a vaccum leak, due to the fact that these vehicles have had some bad problems with the length of wires and hoses, if there is a vaccum leak in the vehicle somewhere that will trigger other malfunctions in your vehicle. Using a can of starting fluid or Brake cleaner spray lightly spray around our engine til you hear the motor rev-up and the spot you have sprayed will determine where your vaccum leak will be. And then check under your distributor cap for any moisture be sure to take a rag and wipe and residue off. Also check the firing order on your distributor.

Posted on Oct 28, 2009

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I forgot to unhook the battery and relay wheni put a new fuel pump in my 2007 trailblazer now it wont crank or make any sounds just signals come on the dash


As long as the key was off and fuel pump relay not energized, you should have had no problem.
Check the pcm B fuse in diagram.
fuel pump-14xnoeoh11hcd40wqw2fpa52-1-0.jpg

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Kill switch for what ? Fuel pump ? If so . doesn't have one . There is a circuit opening relay in the I/P fuse box >The relay is energized by the PCM - engine computer . Do you know what a relay is and how it works ? There are video's on youtube on testing relay's and the electrical circuits they control .

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Tail lights and dash gauge lights not working signals breaks and reverse work as well as all other dash lights prk lamp fuse is not burnt


Do the park lamps work in the front? If they are out front and rear, did you check park lamp fuse circuit for voltage, headlamp switch on. Use a test lite to check for voltage at fuse circuit. Also, notice park lamp relay, That relay has to be energized before you get voltage at the fuse circuit. If you unplug the relay use jumper wire between the two terminals for load side of relay, the park lamps should work. When the relay is energized that line with the arrowhead/load side moves to the other terminal, carries voltage to fuse and park lamps. If that works, problem is on control side of relay or relay is faulty. The bcm grounds control side of relay in order to energize.

26148864-dcv0a2erqphaf2ctvomc3e1x-5-0.jpg

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1999. What are the probable causes of DTC P1624?


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I need a diagram for a 1994 Buick Lesabre fuse-relay center under the hood on the right hand side. When I bought this car the diagram was missing, please help


Hey Jon do you have a security light lit on the dash ? There is a starter enable relay that is energized by the pass key decoder module - anti-theft system ! There are more relays under the dash right side, I/P relay center ! My service info shows relays at the back center of engine compartment , these are cooling fan relays -two , A/C compressor relay , maxi fuse relay center an blower motor relay .

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Ac relay not energizing


The engine computer commands the relay on based on input from the dash control and the ac pressure switch. You may need a shop manual to troubleshoot the circuits.

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I installed a fuel pump kill switch in a2002 tahoe it worked severaltimes however when i moved it around the connection in back of kill switch was loose so I went to store and got more connectors they...


Why would you want a kill switch ? The PCM supply's B+ voltage to energize a relay that turns on the fuel pump. When the key is first turned to on the PCM - engine computer will energize fuel pump relay for two seconds to prime the system . It won't turn it on again untill you crank the engine . ( Turn key to start ) An that is only if it sees a RPM signal from the crank sensor .
GM Fuel Pump Relay Testing

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1 Answer

Abs on vr commodore light stays on solutions


Error logs are a great thing. They will help you find intermittent problems and start you off in a general direction of where a problem could be. There is a great level of detail on the justcommodores site on checking error codes logged by the engine management system, but this does not detail anything about the abs system. The abs warning light is not as common as the check engine warning light. Reading through the posts, I haven't found any detail on checking error codes logged by the abs system.

So here it is. For those of you familiar with checking the engine error codes, this procedure is so simple its not funny.

Basically, to check the engine error log, you bridge the 5th (ground) and 6th pins in the ODB connector under the steering wheel.

To check the ABS error log, using the same trusty calibrated paper clip, you simply bridge pins 5 and 12 of the connector.

To find pins 5 and 12, start at the top left hand corner. That is pin one. Going to the right, you count pin 2,3,4 etc. Once you get to the end, jump back to the start of the bottom left level of pins and keep counting. Pin 5 is about halfway along the top row, pin 12 is a little left of the middle in the bottom row.

Reading the error codes is the same procedure (counting the flashes), except now, the ABS light flashes (as opposed to the engine light when checking the engine codes).

The ABS log also uses code 12 firstly, with any errors logged shown after that. If no errors are logged, the 12 will flash again.

Error codes for the ABS error log (VR/VS) are as follows:

12 Diagnostic system operational
21 Right hand front wheel speed sensor fault
23 Right hand front wheel speed sensor continuity fault
25 Left hand front wheel speed sensor fault
27 Left hand front wheel speed sensor continuity fault
28 Wheel speed sensor frequency error
31 Right hand rear wheel speed sensor fault
33 Right hand rear wheel speed sensor continuity fault
35 Left hand rear wheel speed sensor fault
37 Left hand rear wheel speed sensor continuity fault
41 Right hand front inlet solenoid valve circuit fault
42 Right hand front outlet solenoid valve circuit fault
45 Left hand front inlet solenoid valve circuit fault
46 Left hand front outlet solenoid valve circuit fault
55 Rear inlet solenoid valve circuit fault
56 Rear outlet solenoid valve circuit fault
61 Pump motor relay circuit fault
63 Valve relay circuit fault
71 ABS control module internal fault

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


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.

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