Question about 1995 Chevrolet Cavalier

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How do i manually retreive dtc codes for 95 cavalier without using a scanner.It is a 16 pin terminal

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I wouldnt recomend this..
you could fry your pcm!
go to your local auto zone and let them scan it for free
or for $200 you could buy a actron generic scanner at auto zone..i like em
then consult your manual for dtc's

Posted on Aug 01, 2009

  • dave smith
    dave smith Aug 01, 2009

    I wouldnt recomend this..

    you could fry your pcm!

    go to your local auto zone and let them scan it for free

    or for $200 you could buy a actron generic scanner at auto zone..i like em

    then consult your manual for dtc's

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Which terminals on obd do you short to get dtc,if you don't have scanner


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If your ALDL connector is a 16 pin (looks like an OBD2) but your GM vehicle is 95 or 94 then the only way to scan the codes is with a scanner. http://reddevilriver.com/aldl.html

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DTC CLEAR MANUALLY.
(a) Clear the DTCs.
(1) Using paper clip or piece of auto wire, connect terminals 4 and 13 of the DLC 3 (16 pin connector) located to the driver,s door side near the hood opener.
(2) Turn the ignition switch on.
(3) Clear the DTCs stored in the skid control ECU by depressing the brake pedal 8 times or more within 5 seconds.
(4) Check that the warning light blinks in the normal system code pattern.
(5) Remove jumper wire or paper clip from the terminals of the DLC3.
(6) Turn the ignition switch off.
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The DTCs cannot be cleared by removing the
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GM Bonneville/Eighty Eight/LeSabre 1986-1999
Reading Codes

Print


1987-97 VEHICLES EXCEPT 1997 MODELS WITH 16-PIN DLC

See Figures 1 and 2
Listings of the trouble for the various engine control system covered in this manual are located in this section. Remember that a code only points to the faulty circuit, NOT necessarily to a faulty component. Loose, damaged or corroded connections may contribute to a fault code on a circuit when the sensor or component is operating properly. Be sure that the components are faulty before replacing them, especially the expensive ones.


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Fig. Fig. 1: ALDL/DLC terminal identification for 1987-97 vehicles, except 1997 models with a 16-pin DLC
The Assembly Line Diagnostic Link (ALDL) or Data Link Connector (DLC) may be located under the dashboard, and is sometimes covered with a plastic cover labeled DIAGNOSTIC CONNECTOR.

  1. The diagnostic trouble codes can be read by grounding test terminal B . The terminal is most easily grounded by connecting it to terminal A (internal ECM ground). This is the terminal to the right of terminal B on the top row of the ALDL connector.
  2. Once the terminals have been connected, the ignition switch must be moved to the ON position with the engine not running.
  3. The Service Engine Soon or Check Engine light should be flashing. If it isn't, turn the ignition switch OFF and remove the jumper wire. Turn the ignition ON and confirm that the light is now on. If it is not, replace the bulb and try again. If the bulb still will not light, or if it does not flash with the test terminal grounded, the system should be diagnosed by an experienced driveability technician. If the light is OK, proceed as follows.
  4. The code(s) stored in memory may be read through counting the flashes of the dashboard warning lamp. The dash warning lamp should begin to flash Code 12. The code will display as one flash, a pause and two flashes. Code 12 is not a fault code. It is used as a system acknowledgment or handshake code; its presence indicates that the ECM can communicate as requested. Code 12 is used to begin every diagnostic sequence. Some vehicles also use Code 12 after all diagnostic codes have been sent.
  5. After Code 12 has been transmitted 3 times, the fault codes, if any, will each be transmitted 3 times. The codes are stored and transmitted in numeric order from lowest to highest.

The order of codes in the memory does not indicate the order of occurrence.
  1. If there are no codes stored, but a driveability or emissions problem is evident, the system should be diagnosed by an experienced driveability technician.
  2. If one or more codes are stored, record them. Refer to the applicable Diagnostic Code chart in this section.
  3. Switch the ignition OFF when finished with code retrieval or scan tool readings.

After making repairs, clear the trouble codes and operate the vehicle to see if it will reset, indicating further problems.

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Fig. Fig. 2: Engine diagnostic trouble codes - 1987-93 vehicles, and 1994 vehicles with a 12-pin DLC connector


197 VEHICLES WITH 16-PIN DLC AND ALL 1995-99 MODELS

See Figures 3 through 7


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Fig. Fig. 3: DLC terminal identification for 1994 vehicles with a 16-pin DLC, as well as all 1995-99 models
On 1994-95 3.4L and 3.8L engines, and all 1996 models, an OBD-II compliant scan tool must be used to retrieve the trouble codes. Follow the scan tool manufacturer's instructions on how to connect the scan tool to the vehicle and how to retrieve the codes.


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Fig. Fig. 4: Engine diagnostic trouble codes (1 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles


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Fig. Fig. 5: Engine diagnostic trouble codes (2 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles


0996b43f8021af6b.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 6: Engine diagnostic trouble codes (3 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles


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Fig. Fig. 7: Engine diagnostic trouble codes (4 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles

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I have been trying to retrive the DTC's from my 95 lumina. I tried the OBD-I process, but the MIL did not flash the codes. I bought an CAN OBD-I & II tool, but the reader tells me that the tool is not...


On some 1995 OBD 1 models with a 12-pin Data Link Connector, trouble codes can be accessed by connecting terminal B to terminal A with a jumper wire. With the key in on position, the codes can be read by watching the "service engine soon" light. HOWEVER, some models have a 16-pin DLC and you have to jump terminals 5 and 6 to get the trouble codes to flash.

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3 Answers

I need to know how to manually retrieve dtc codes without a scanner.What are the steps of this procedure.I have a 1995 chevy cavalier 2.2 l with a check engine light on.The pin terminal has 16 pins.


This info is from the tech manual.....because you have a 16-pin DTC connector, you have the OBD II system in your car. This is cut and pasted info from the tech manual:

Fig. 2: A Tech 1® , or equivalent scan tool must be used to retrieve codes from 1996–00 models with the 16-pin DLC connector


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If you look on your doorjamb and read the sticker, it will tell you the year of your car...and if it was manufactured AFTER a certain month, then you have the 96 model...and from what you are saying, you have a 96 model because it has the 16-pin connector and not the 12-pin connector that the 95 and earlier had.

Reading Codes OBD-I SYSTEMS
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1 Answer

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Check the CIG fuse it goes directly to pin 16. It also powers the cigarette lighter. That fuse should be in the I/P fuse box.

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OBD 1.5 OBD 1.5 refers to a partial implementation of OBD-II which General Motors used on some vehicles in 1994 and 1995 (GM did not use the term OBD 1.5 in the documentation for these vehicles - they simply have an OBD and an OBD-II section in the service manual.)
For example, the 94-95 Corvettes have one post-catalyst oxygen sensor (although they have two catalytic converters), and have a subset of the OBD-II codes implemented. For a 1994 Corvette the implemented OBD-II codes are P0116-P0118, P0131-P0135, P0151-P0155, P0158, P0160-P0161, P0171-P0175, P0420, P1114-P1115, P1133, P1153 and P1158.[1]
This hybrid system was present on the GM H-body cars in 94-95, W-body cars (Buick Regal, Chevrolet Lumina ('95 only), Chevrolet Monte Carlo ('95 only), Pontiac Grand Prix, Oldsmobile Cutlass Supreme) in 94-95, L-body (Chevrolet Beretta/Corsica) in 94-95, Y-body (Chevrolet Corvette) in 94-95, on the F-body (Chevrolet Camaro and Pontiac Firebird) in 95 and on the J-Body (Chevrolet Cavalier and Pontiac Sunfire) and N-Body (Buick Skylark, Oldsmobile Achieva, Pontiac Grand Am) in 95.
Depending on the year and the vehicle, a car with the OBD 1.5 system may have either the older OBD-I connector, or the newer OBD-II connector, but they are electrically identical to each other.[citation needed]
The pinout for the ALDL connection on these cars is as follows:
180px-obd-connector-pinout.png magnify-clip.pngFemale OBD connector pinout 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 For ALDL connections, pin 9 is the data stream, pins 4 and 5 are ground and pin 16 is battery voltage.
Additional vehicle-specific diagnostic and control circuits are also available on this connector. For instance, on the Corvette there are interfaces for the Class 2 serial data stream from the PCM, the CCM diagnostic terminal, the radio data stream, the airbag system, the selective ride control system, the low tire pressure warning system and the passive keyless entry system.[2]
An OBD1.5 has also been used on Mitsubishi cars of '95 '97 vintage.
An OBD1.5 has been used in some 1995 Volkswagen VR6's (Juice Box's GTI)

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