Question about 1993 Chevrolet Suburban

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How to check out the codes on check engine light a 93 chevy suburban.

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  • Chevrolet Master
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1988–95 MODELS 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. Fig. 1: ALDL connector — 1988–92 models How to check out the codes on check engine light a - 84904060.gif
The Assembly Line Diagnostic Link (ALDL) connector or Data Link Connector (DLC) may be located under the dash and 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 OFF and remove the jumper wire. Turn the ignition ON and confirm that 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. Fig. 2: ALDL connector — 1993–95 models 84904061.gif

  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. NOTE: The order of codes in the memory does not indicate the order of occurrence.
  6. If there are no codes stored, but a driveability or emissions problem is evident, the system should be diagnosed by an experienced driveability technician.
  7. If one or more codes are stored, record them. Refer to the applicable Diagnostic Code chart in this section.
  8. Switch the ignition OFF when finished with code retrieval or scan tool readings. NOTE: After making repairs, clear the trouble codes and operate the vehicle to see if it will reset, indicating further problems.
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Posted on Jul 12, 2010

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Posted on Jan 02, 2017

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jmeyer847
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SOURCE: PO179 CODE

P0179 Fuel Composition Sensor Circuit High Input. May have got some bad fuel somewhere. I would erase your codes and see if it comes back. If it does I would take your vehicle to the stealership to have it diagnosed a little further. Thanks for using fixya.

Sincerely,

IC

Posted on Jan 08, 2009

  • 41 Answers

SOURCE: I have a 93 Chevy Suburban 1500 and the

yes just change out the tail shaft the electric speed o into the older one i just changed out a 84 to a 93 trans very easy

Posted on Jun 25, 2009

  • 9 Answers

SOURCE: how do i retrieve codes? check engine light is on.

either google the code or go to the dealer and have them use the reference guide for you vehicle. most dealerships have a huge collection of reference books that goes back years and years

Posted on Jul 13, 2009

  • 3600 Answers

SOURCE: How do you reset the check engine light?

If you have the problem resolved try disconnecting the battery for 3 minutes then reconnect, if it still stays on then you will need to go to Auto-zone to have them run diagnostic test for the truck once you have pulled the codes then select clear codes then reset the computer with scan tool. This is a free service from AutoZone. Be sure to write down all trouble codes so that it can be looked at later if it does not work. Then if it does not stay off post the trouble codes here so it can be diagnosed.

Posted on Jul 14, 2009

jgwhomeequip
  • 1902 Answers

SOURCE: I have a 2002 Chevy

Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include:

  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present

A code P0300 may mean that one or more of the following has happened:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel2_bing.gif injector(s)
  • Burned exhaust valve
  • Faulty catalytic convertor(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

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