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Engine Scan Tool

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by FireBlazer, May 8, 2002.

  1. FireBlazer

    FireBlazer Registered Member

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    I bought a engine scanner but don't know what the information means. Knowing what the numbers are is good, knowing what they actually mean would be great!
    Thanks!
     
  2. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    BlazinOR (I think) pointed me to this gem. Helped me allot.

    <a target="_blank" href=http://www.amazon.com/exec/obidos/ASIN/076030422X/qid%3D/103-6943320-3777410>How to Tune and Modify Chevrolet Fuel Injection</a>
    ISBN 0-7603-0422-X
     
  3. NITRO

    NITRO 1/2 ton status

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    i already posted this once

    12 No reference pulses to Electronic Control Module (ECM)

    13 Oxygen (O2) Sensor - signal stays low ("lean") during warm engine cruise

    14 Coolant Temperature Sensor (CTS) - signal voltage is low

    15 Coolant Temperature Sensor (CTS) - signal voltage is high

    16 High battery voltage
    Direct Ignition System (DIS) fault - line open or shorted to ground

    17 RPM signal problem

    21 Throttle Position Sensor (TPS) - signal voltage is high during engine idle or deceleration

    22 Throttle Position Sensor (TPS) - signal voltage is low during engine idle
    Fuel cutoff relay circuit - open or shorted to ground

    23 Manifold Air Temperature (MAT) Sensor - signal voltage is low
    Throttle Position Sensor (TPS) error

    24 Vehicle Speed Sensor (VSS) - signal is constant (no pulsing) during engine deceleration

    25 Manifold Air Temperature (MAT) Sensor - signal voltage is low
    Vacuum Switching Valve Circuit open or shorted to ground
    ATS Sensor - signal voltage is high

    26 Quad driver module

    27 2nd gear switch

    28 3rd gear switch

    29 4th gear switch

    31 Manifold Absolute Pressure (MAP) Sensor - signal voltage is low
    Fuel injector
    Park or Neutral switch
    CAM diagnostic
    Governor Malfunction
    Wastegate overboost
    Wastegate Eletrical Signal - open or shorted to ground

    32 Barometric Pressure (BARO) Sensor circuit failure
    Exhaust Gas Recirculation (EGR) valve diagnostic switch - closed during engine startup or open when EGR flow requested by ECM
    EGR/EVRV (Electronic Vacuum Regulator Valve)

    33 Mass Air Flow (MAF) Sensor - signal voltage or frequency is high during engine idle
    Manifold Absolute Pressure (MAP) Sensor - signal voltage is high during idle [Note: Engine mis-fire or unstable idle may cause this code]

    34 Mass Air Flow (MAF) Sensor - signal voltage or frequency is low during engine cruise
    Manifold Absolute Pressure (MAP) Sensor - signal voltage is low during ignition on

    35 Idle Air Control (IAC) system problem - can not set desired RPM

    36 Mass Air Flow (MAF) Sensor - burn off circuit problem
    Transmission shift problem
    Direct Ignition System (DIS) fault - extra or missing pulses in Electronic Spark Timing (EST) signal

    38 Brake switch circuit failure

    39 Torque Converter Clutch (TCC) circuit fault

    41 Cam Sensor (CAM) failure
    Cylinder Select Error
    Tach Input Error - no reference pulses during engine run

    42 Electronic Spark Timing (EST) circuit - open or shorted to ground during engine run
    Direct Ignition System (DIS) fault - bypass circuit open or shorted ground during engine run
    Fuel Cutoff Relay Circuit - open or shorted to ground

    43 Electronic Spark Timing (EST) Circuit - low voltage detected

    44 Lean exhaust indication - Oxygen (O2) Sensor voltage stays low after on or two minutes of engine run

    45 Rich exhaust indication - Oxygen (O2) Sensor voltage stays high after one minute of engine run

    46 Vehicle Anti-Theft Sytem (VATS) failure
    Power Steering Switch failure

    47 Electronic Control Module (ECM) computer circuit problems - Universal Asynchronous Receiver/Transmitter(UART) link

    48 Misfire

    49 Vacuum leak

    51 Electronic Control Module (ECM) computer circuit problems - Programmable Read-OnlyMemory (PROM)
    Checksum errors

    52 Electronic Control Module (ECM) computer circuit problems - fuel calpac missing, analog todigital converter (A/D) error quad driver module (QDM) fault
    Oil Temperature Sensor - signal voltage is low

    53 Over voltage condition
    Exhaust Gas Recirculation (EGR)
    Voltage reference error
    Vehicle Anti-Theft System (VATS) problems

    54 Low fuel pump voltage
    Fuel pump relay
    Quad Driver Module (QDM) output failure

    55 Electronic Control Module (ECM) computer circuit problems - ECM failure, Serial Bus error, SAD error
    Fuel lean malfunction

    56 Corrosivity/add collant
    Port Throttle System Vacuum Sensor problems

    58 Vehicle Anti-Theft System (VATS) problem

    61 Oxygen (O2) Sensor degraded
    Port Throttle System error
    Cruise control problems - vent solenoid circuit

    62 Gear switch imput diagnostics
    Oil Temperature Sensor - signal voltage is high
    Cruise Control Problems - vacuum solenoid circuit

    63 Manifold Absolute Pressure (MAP) Sensor - signal voltage is high
    Small EGR failure
    Right Oxygen (O2) Sensor failure

    64 Manifold Absolute Pressure (MAP) Sensor - signal voltage is low
    Medium EGR failure
    Right Oxygen (O2) Sensor - lean condition indicated

    65 Large EGR failure
    Injector Peak/hold Diagnostic
    Right Oxygen (O2) Sensor - rich condition indicated
    Cruise Control Position Sensor Problem

    66 Electronic Control Module (ECM) computer circuit problem - internal reset occurred

    67 Cruise Control - switch circuit problems

    68 Cruise Control - system circuit problems

    69 Air Conditioner Pressure Switch - circuit problems

    88 Electronic Control Module (ECM) computer circuit problem - internal reset occured

    NITRO
     
  4. BurbinOR

    BurbinOR 3/4 ton status

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    Here's the code page link............... http://216.121.161.76/files/GMError.pdf

    Anyway, what scanner do you have? The book Bad Dog mentioned is good for figuring out a baseline (thanks Russ for the props!) and you can post some info here - we can surely help ya get acclimated to the wonderful world of digital engine management................/forums/images/icons/laugh.gif
     
  5. FireBlazer

    FireBlazer Registered Member

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    I bought it a few years ago, its an actron scan tool. Its pretty good I think. It lets you read the codes, view data, and record data. Its just the manuels that came with it really don't help you trouble shoot. I once had to research the TPS once, and spent half the day at the library figuring out the voltage settings.

    The problem I am having is when my truck is idling. The idle drops and then picks back up. It then lights the SES light and code 42 came up. But what good does that do you, it only points you in a direction, I want it to be more specific. I guess I have unrealalistic expectations as to what the tool can do.

    Thanks to all of you with your help!
     
  6. FireBlazer

    FireBlazer Registered Member

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    Thank you, I placed the order for the book.
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    I don't have any GM service manuals new enough for the trucks to be certain, but they are gold mines when researching data for the GM cars. Unless something out there is made EXACTLY with GM injection/CCC in mind, I doubt anything can be better than the GM service manual and electrical manuals.

    Anyone have a newer manual that they can check for sensor voltage/readings to be sure they are in there? I know it is in the car manuals, even for CCC in '85.
     
  8. HarryH3

    HarryH3 1 ton status Author

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    Yep, the Driveability and Emissions section of the newer GM service manuals go into very good detail about how each sensor works, what output to expect from it, what wires it is connected to, etc. They even have a flowchart for troubleshooting a particular sensor circuit in a logical sequence. But using one that is for a different year than your vehicle can get you very confused, so make sure that you have the right one. /forums/images/icons/cool.gif
     

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