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Scan tool doesn't connect to the computer - 1999 Dodge Caravan

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Ijust went through this I used contact cleaner and it worked

Posted on Aug 04, 2013

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How do I program a 2002 trailblazer 4 wheel drive shift control module


Sorry , dealer only !
Programming Using Scan Tool Pass-Through Connection
  1. Connect the scan tool to vehicle and power it up.
  2. Connect the computer station to the scan tool.
  3. Select "PC Using Scan Tool Connection" from the programming menu on the computer station.
  4. Follow the menu select items for reprogramming and provide information as to what type of device you are programming and whether you are reprogramming or replacing the electronic control unit (ECU).
  5. Select "vehicle" from the selection menu.
  6. Select the module you wish to program.
  7. Select "Normal" for Programming Type.
  8. Select the applicable software calibrations.
  9. Transfer data file to the scan tool.

Sep 28, 2016 | Cars & Trucks

1 Answer

I have a message (air condition no connected)in my car LEXUS VG 470 v8 model 2006 and i can't read the trouble code with scan tool please help


You need a professional scan tool to read
body codes & the correct software
for asian vehicles, as well as enhanced data

Mar 08, 2013 | Cars & Trucks

1 Answer

Code p0403 on a 2001 chrysler intrepid


Hi there:
P0403 - Exhaust Gas Recirculation Circuit Malfunction



The most common failure is the EGR solenoid goes bad. The code will not set and turn on the light until the car's computer has gotten around to completing the EGR self-test.

The P0403 indicates the computer is not seeing any voltage on the blue wire coming back from the egr solenoid.


With the ignition on and engine off, use a scan tool to activate the EGR solenoid. Listen or feel for a clicking, indicating that the solenoid is operating.

If the solenoid does operate, you'll have to check current draw on the ground circuit. It should be less than one amp. If it is then the problem is intermittent. If it isn't then there is excessive resistance in the circuit and perform the following

1. When it's activated see if you can blow lightly through it. IF you can\'t there may be a blockage causing excessive resistance. Replace EGR solenoid as needed. If there is no blockage, disconnect the EGR solenoid and the PCM connector containing the EGR solenoid control circuit. Using a digital Volt-Ohm meter (DVOM) check resistence between the control circuit and battery ground. It should be infinite. If it isn't, then there is a short to ground on the control circuit. Repair the short to ground and retest as needed.

2. If the solenoid doesn't click as it should, disconnect the EGR solenoid connector and connect a test light between the two wires. Using the scan tool, command the EGR solenoid on. The light should light up. If it does, replace the EGR solenoid. If it does not perform the following: a. Check for 12 Volts on the ignition supply voltage to the solenoid. If it isn't present, inspect the supply circuit for an open, or a short due to chafing or breakage and re-test. b. If it still doesn't operate: then manually ground the EGR solenoid control circuit. The light should light. If it does, repair open in EGR solenoid control circuit and re-test. If it doesn't, replace EGR solenoid.


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 28, 2012 | 2001 Dodge Intrepid

1 Answer

My securty light is on in my 2002 chevy impala and my car wont start. how do i fix the problem


The GM PASSLOCK system is the probable cause, Try a different ignition key. If that doesn't solve the problem continue reading:
A Scan Tool can be used to read and erase trouble codes, display, record and play back LIVE diagnostic data and perform other tests allowed by the vehicle maker. Scan tools that cover vehicles 1982 to present are available at your local auto supply dealer.

You don't indicate any diagnostic tests to date. A dealer or your local mechanic will charge $100-$200 to perform a diagnostic scan. However, AutoZone will provide a thorough scan for FREE. Anyone who tells you that a modern vehicle can be diagnosed without a scanner with the problems you have set forth is merely guessing.

Oct 07, 2011 | 2002 Chevrolet Impala

2 Answers

Both brake lights are out, third light working, replaced bulbs & brake light circuit board, still nothing!


This could be a ground issue.
Check the wires and ground connections in the tail light with an ohm meter.
I am thinking a ground wire is at fault here.

Sep 28, 2011 | 2000 Chevrolet Venture

1 Answer

WHY DOES THE ENGINE CHECK LIGHT GOES ON AND OFF STAY ON OFF IN A CHRYSLER TOURING 2007


Hi there,

Your vehicle's OBD computer monitors all your vehicle's electrical emission circuits.

Each time you turn your key, the computer considers this 1 x drive cycle.

When a fault (or out of spec) condition occurs, this will register a fault code in the computer's memory. Some circuits will only trigger the Check Engine Light (CEL) after the same fault occurs a few times. Other circuits will trigger the CEL with just one fault detection.

In the same manner, if the fault condition is only intermittent, the computer may consider the condition recitified, if that fault does not occur after several drive cycles (i.e. the CEL will no longer light up).

The only way to have this resolved is to arrange for your local Mercedes dealership (or authorised service agent) to connect their factory SCAN TOOL.....and read your computer's stored fault codes.

These fault codes will quickly identify the suspected circuits (eliminating unnecessary garage labor costs), allowing quick diagnosis & repair.

Note: Mercedes Scan Tools operate on a different communication protocol. Typical scan tools designed for American & Japanese vehicles use a different protocol, therefore, I recommend this be done only by a Mercedes agent (or European service specialist).

The process of scanning for fault codes only takes 15-25mins (depending on the technician's experience), hence should not cost you much to have this procedure performed.





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Jul 31, 2011 | 2005 Chrysler 300

1 Answer

My Break, ABS and Trac warning lights all come on at the same time. I can shut the engine down and restart the issue goes away. I t seems to be happening more frequently. My mechanic found nothing wrong...


Nothing wrong. Doesn't that seem strange to you

The ABS & Trac came on because that system has issues

There may be stored data, if not a code present

The mechanic has to component test to find the problem

These guys spend too much time with a scan tool & I
think some of them are waiting for it to tell them something

Doesn't work that way. If everything goes as it should, the
scanner shows what the computer sees,that's all,& that can
be a lot,but you have to move on & use different skills that
not everyone has learned yet apparently

Try another shop

That really isn't a diagnostic test etc,just looking at data
stream,if they see nothing out of range they quit

That doesn't help you any,the problem is still there,intermitent
maybe, but there.

Jun 26, 2011 | 2001 Ford Windstar

1 Answer

Erg code 405 how do test it


Potential causes of a P0405 code include:
Short to ground in EGR signal or Reference circuits
Short to voltage in EGR ground or signal circuits
Bad EGR valve
Bad PCM wiring issues due to chafing or loose terminals


Possible Solutions:
If you have access to a scan tool you can command the EGR valve on. If it responds and the feedback indicates the valve is moving properly then the problem may be intermittent. Sometimes in cold weather, moisture can freeze in the valve causing it to stick. After the vehicle warms up the problem may disappear. Carbon or other debris can lodge in a valve causing it to stick also

If the EGR valve doesn't respond to your commands with the scan tool, disconnect the EGR harness connector. Turn the key to on position, engine off (KOEO). Using a voltmeter, check for 5 volts on the reference wire to the EGR valve. If there is no 5 volts, is there any voltage at all? If there is 12 volts, then repair short to voltage in the 5 volt reference circuit. If there is no voltage connect a test light to battery voltage and probe the 5 volt reference wire. If the test light illuminates, the 5 volt reference circuit is shorted to ground. Repair as necessary. If the test light doesn't illuminate check for an open in the 5 volt reference circuit. Repair as necessary

If there is no apparent problem and there is no 5 volt reference, PCM may be at fault, however other codes will likely be present. If 5 volts are present on the reference circuit, jumper the 5 volts to the EGR signal circuit. Now the EGR position on the scan tool should read 100 percent. If it doesn't connect test light to battery voltage and probe the EGR signal circuit. If it illuminates, then the signal circuit is shorted to ground. Repair as necessary. If the light doesn't illuminate, check for an open on the EGR signal circuit. Repair as necessary.

If, after jumpering the 5 volt reference circuit to the EGR signal circuit the scan tool EGR position reads 100 percent, then check for poor terminal tension at the EGR valve connector. If the wiring is okay, replace the EGR valve.

Hope this helps.

Jun 24, 2011 | Chevrolet S 10 Cars & Trucks

1 Answer

Scan tool will not connect to PCM, car has no spark, engine rolls over but wont start


Does your 'service engine soon' (sometimes a check engine) light stay on if you turn the key to 'run' but don't start it? If this light comes on then the computer is getting power. The no spark could be caused by a bad cam or crank sensor. Since the computer on Dodge vehicles uses both sensors for spark, you can't really tell which one is the issue unless you can connect a scan tool. The scan tool is powered by the port you plug it into, which gets its' power from the cigarette lighter fuse.

Jun 21, 2011 | 1997 Dodge Avenger

1 Answer

03 Ford Explorer w/ V6 engine. Will not communicate with state of CT Emissions computer but scan tools work fine without any codes. Mechanic has has check wiring at OBDII connector which is good and is...


NO it's not bad. If any scan tool reads it and the mechanics scan tool wont' then there is a problem with the mechanics scan tool. Some scan tools require a different chip in them to read different cars. Try another mechanic.

May 07, 2011 | Ford Explorer Cars & Trucks

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