Question about 2000 Chevrolet Blazer

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No power to obd2 connector

I connect computer it wont power on and i have tried multiple shop computers and they still don't gain power or even read codes

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Check the cigar lighter fuse it is probably blown, that is where the 12v supply comes from, then check why it blew, chances are its a faulty adapter being used in it, cell phone, radar detector, etc, or there could be debris in it a coin, foil gum wrapper, if nothing found replace the cigar lighter

Posted on Jan 15, 2013

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Posted on Jan 02, 2017

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SOURCE: 04 tahoe check engine light

Check all the fuses with a 12 volt test light. Also does the cigar lighter work many times the same fuse that is for the cigar lighter also powers up the obd 2 connector.

Posted on Jan 07, 2009

  • 2920 Answers

SOURCE: multiple misfire

it could be in the timing...you might have it checked

Posted on Jan 29, 2009

  • 5 Answers

SOURCE: We have a 1998 chevy

shift solenoid malfunction

google "PO785" and you will find more out about it. I saw something about a 3-2 shift

Posted on May 10, 2009

  • 400 Answers

SOURCE: engine died, everything else normal. plugged obd2

No that doesn't mean the pcm is bad. Replace the cigar fues under the hood. That is where the power is supplied to the scanner. If that fues is blown the scanner will NOT turn on. The quick way of seeing if the pcm is alive is just to turn the key on, if the check engine light is on then the pcm is alive, doesn't mean there isn't a problem but means that it is still online.
Check to see what your fuel pressure is at, you need 50-55 psi to even light the engine!
Report back with your findings

Posted on Oct 27, 2009

  • 396 Answers

SOURCE: i tried to hook a obd2 code reader on and it wont

First things first. If the reader won't power up check the fuse for cigar lighter. Should be a 10 amp/yellow fuse.

Posted on Feb 02, 2010

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My 1996 cavalier wont pass inspection as the analyzer cannont communicate with my vehicles computer, what does that mean, autozone computer wont work either . i have no idea what to do, mechanic said it...


Testing your OBD2

Before You Begin
Since all vehicles are not the same please refer to the manual supplied with the OBD2 code reader for vehicle specific instructions.
Is your vehicle compliant?
All cars and light trucks manufactured since late 1995 should be OBD2 compliant. Two factors will show if your vehicle is definitely OBD2 equipped:
  • There will be a note on a sticker or nameplate under the hood: "OBD2 compliant”
  • There will be an OBD2 connector as shown below
april08_img1.gif
Pin 2 - J1850 Bus
Pin 4 - Chassis Ground
Pin 5 - Signal Ground
Pin 6 - CAN High (J-2284)
Pin 7 - ISO 9141-2 K Line
Pin 10 - J1850 Bus
Pin 14 - CAN Low (J-2284)
Pin 15 - ISO 9141-2 L Line
Pin 16 - Battery Power
Where is the connector located?
The connector must be located within three feet of the driver and must not require any tools to be revealed. Look under the dash and behind ashtrays.
Important info about OBD2
  • Can diagnose/check engine problems in all CAN and OBD2 vehicles (1996 and newer) and many of the most popular OBD1 (1981 to 1995) vehicles
  • Features unique patented all-in-one screen display and LED display for quick emissions check
  • Automatic refresh updates data every 30 seconds when connected to the vehicle - an easy way to verify repair completion
  • Code definition can be displayed in English, French and Spanish
  • Can be Flash updated with a standard Windows® PC
  • Features memory/battery backup for off-car review and analysis
Connecting
Connecting the OBD2 Code Reader is as simple as locating the DLC connector. The DLC connector is usually found under the driver side (left side) of the dash. The cable attaches only one.
Reading the LCD Display
april08_img2-small.gifClick to enlarge
Before you start testing, take a good look at the LCD display. The illustration above explains what the various icons mean and how the DTC (Diagnostic Trouble Code) will be displayed. The unit is self-powered by three-AAA batteries and will let you know when they are running low. When connected/receiving power from the vehicle, the CAR Icon will display.
The OB2 code reader is a very simple tool to use. Once it is connected, turn the power on. Once the ignition is switched to the on position, the code reader is checking the system for any stored DTCs.
The meaning of each DTC can be found in the manual supplied with your code reader.

Example: the code reader displays a DTC PO309, Cylinder 9 misfire was detected.
P0298 Engine Oil Over Temperature P0300 Random/Multiple Cylinder Misfire Detected P0301 Cylinder 1 Misfire Detected P0302 Cylinder 2 Misfire Detected P0303 Cylinder 3 Misfire Detected P0304 Cylinder 4 Misfire Detected P0305 Cylinder 5 Misfire Detected P0306 Cylinder 6 Misfire Detected P0307 Cylinder 7 Misfire Detected P0308 Cylinder 8 Misfire Detected P0309 Cylinder 9 Misfire Detected P0310 Cylinder 10 Misfire Detected P0311 Cylinder 11 Misfire Detected
Once you know what the problem is, you have to determine what's causing it. In this case the intake manifold gasket was faulty. Once the repairs have been made, it is time to clear the DTC and check the system to verify the repair.
Clearing the Diagnostic Trouble Code (DTC)
Clearing the DTC is very simple. Press the ERASE button on the code reader. A message will display on the screen; "SURE" for conformation. If you wish to clear the DTC press and hold down the ERASE button again until a message appears on the screen "DONE". If you did not wish to clear the codes and hit Erase by mistake at the screen message "SURE" simply press the link button to return without erasing any DTCs.
When you clear the DTC(s) from the PCM (Power train Control Module)you also clear ALL of the other gathered information that the PCM has collected, including Freeze Frame, Drive Cycle data, manufacture specific enhanced data end everything stored in memory is erased - just like if you cleared the Cache files on your PC.
The vehicle's PCM will need to re-learn the information that was erased. Don't be alarmed!! This is easily accomplished just by driving the vehicle. All you have to do is get driving.

Good luck and check the OBD 2 connection port.

Dec 02, 2009 | 1996 Chevrolet Cavalier

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