Reading codes

Discussion in 'Chevy Truck Forum' started by raybo100, Dec 21, 2008.

  1. raybo100

    raybo100 Member

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    I have a 94 chev silverado (454 cid) and was wondering how to read the codes
    I know on my olds delta 88 that you jumper A and B terminals and count the flashes but my plugin on the truck does not have it marked which ones are A and B (any help)
    Does any one have an idea as well as what the flashes would represent ( I found stuff for my olds but nothing for a silverado on the intenet)
    please do not say to take to a shop and put on scanner as they charge big bucks for the same info if you jumper the scanner plug in and count flashes
    thanks in advance
     
  2. Flopeyeman

    Flopeyeman Senior Member

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    You can go to Advance auto or autozone and they will scan it for free!
     
  3. raybo100

    raybo100 Member

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    neither of those stores around here only in the U.S.?? or they dont have a website for us canadians
    checked around and cheapest was $120 min charge to put on scanner
    Canadian Tire used to do some of this but with the economy going strong they only do starters, batteries if you take them out of truck and bring into store to test them
     
  4. Chevy_Finatic79

    Chevy_Finatic79 Senior Member

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  5. Chevy_Finatic79

    Chevy_Finatic79 Senior Member

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    here are codes for a 94' Chevy: (note a couple of them are probably missing I know this because the system will flash the code 12 if no codes are present and at the begining and end of the flash process)

    remeber that a code 12 for example would be like morse code 1 long flash followed by 2 short flashes.

    also that 94' may possibly have OBD-II which can't be jumped it requires a scantool


    13 Open Oxygen Sensor Circuit
    14 Coolant Temperature Sensor (High Temp Indicated)
    15 Coolant Temperature Sensor (Low Temp Indicated)
    21 Throttle Position Sensor (Signal Voltage High)
    22 Throttle Position Sensor (Signal Voltage Low)
    23 Manifold Air Temperature (MAT) Low Temp Indicated
    24 Vehicle Speed Sensor (VSS) Circuit
    25 Manifold Air Temperature (MAT) High Temp Indicated
    32 Exhaust Gas Recirculation (EGR) Circuit
    33 Manifold Absolute Pressure Sensor Circuit (High Sig.)
    34 Manifold Absolute Pressure Sensor Circuit (Low Sig.)
    35 Idle Air Control (IAC)
    41 Cylinder Select Error
    42 Ignition Control (IC) Circuit
    43 Knock Sensor (KS) Circuit
    44 Oxygen Sensor Circuit (Lean Exhaust Indicated)
    45 Oxygen Sensor Circuit (Rich Exhaust Indicated)
    51 EEPROM or ECM Failure
    53 System Voltage Overcharge
    54 Fuel Pump Circuit (Low Voltage)
    55 ECM Error
    61 Degraded Oxygen Sensor
    62 Transaxle Gear Switch Signal Circuit
    63 A/C Refrigerant Pressure Sensor Circuit

    BE SURE TO CHECK THIS SITE THEY HAVE WAY MORE DETAILED CODE LISTS
    http://www.troublecodes.net/technical/
     
  6. raybo100

    raybo100 Member

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    thanks a lot after I have a sleep this morning I will get my trusty jumper wire out and go at it
    glad I have a shop to work in it is -30 degrees celcius ( was -37 yesterday so things are looking good)
     
    Last edited: Dec 22, 2008

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