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    1999 GMC Truck Yukon 4WD 5.7L SFI 8cyl

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    1720 S RIDGEWOOD A
    (386) 427-1210

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    Ford Sable, Taurus 2000-05

    Powertrain Control Module (PCM)

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    Operation



    The Powertrain Control Module (PCM) performs many functions on your vehicle. The module accepts information from various engine sensors and computes the required fuel flow rate necessary to maintain the correct amount of air/fuel ratio throughout the entire engine operational range.

    Based on the information that is received and programmed into the PCM's memory, the PCM generates output signals to control relays, actuators and solenoids. The PCM also sends out a command to the fuel injectors that meters the appropriate quantity of fuel. The module automatically senses and compensates for any changes in altitude when driving your vehicle.

    Click image to see an enlarged view

    Fig. PCM assembly

    PCM Actuator & Sensor Tables



    Application: All Vehicles With A Baro/MAP Sensor

    Barometric Pressure Sensor Chart

    Approximate Altitude in FeetBARO Hertz Rate
    0 feet (sea level)159 Hz
    1000 feet156 Hz
    2000 feet153 Hz
    3000 feet150 Hz
    4000 feet147 Hz
    5000 feet144 Hz
    6000 feet141 Hz
    7000 feet139 Hz
    8000 feet136 Hz

    Manifold Absolute Pressure Sensor Chart

    Manifold Vacuum (" Hg)MAP Hertz Rate
    KOEO at Sea Level159 Hz
    5" Hg146 Hz
    8" Hg134 Hz
    10" Hg129 Hz
    11" Hg126 Hz
    12" Hg124 Hz
    13" Hg121 Hz
    14" Hg119 Hz
    15" Hg116 Hz
    16" Hg114 Hz
    17" Hg111 Hz
    18" Hg109 Hz
    19" Hg107 Hz
    20" Hg104 Hz
    21" Hg102 Hz
    22" Hg99 Hz
    23" Hg97 Hz
    24" Hg95 Hz

    Application: Domestic Vehicles All applicable EEC-IV & EEC-V Vehicles

    Pressure Feedback EGR (PFE) Sensor

    PSIInches HGVoltsCode Set Values
    1.823.704.75Hot idle: A code sets if the PFE
    1.362.794.38Sensor signal is under 2.60v or if
    0.911.854.00the PFE signal is more than 4.20v
    0.460.943.63  
    003.25  
    -2.47-5.031.22  
    -3.63-7.400.25  

    EGR Vacuum Regulator (EVR) Solenoid Vacuum Examples

    Duty   Vacuum     Output  
    Cycle (%)Min   Nom   Max  
      In-HgKPaIn-HgKPaIn-HgKPa
    0000.381.280.752.53
    330.551.861.34.392.056.90
    905.6919.26.3221.36.9523.47

    NOTE: EVR resistance values - for 4.9L and 5.8L engines: 20-45 ohms, for 7.5L engines: 100 ohms. For all other engines: 30-70 ohms.

    Output Device Resistance Chart for OBD I and OBD II Vehicles

    ComponentOhm ValueComponentOhm Value
    AM1 Valve40-80 ohmsAM2 Valve40-80 ohms
    Canister Purge Valve40-80 ohmsIdle Air Control Motor7-13 ohms
    CCRM (module)1K minimumIRCM (module) - FP65-110 ohms
    EPC Solenoid36-43 ohmsHigh Pressure Injector12-16 ohms
    EGR VR Solenoid26-40 ohmsShift Solenoid 1 (SS1)15-25 ohms
    Electro Drive Fan (EDF)65-110 ohmsShift Solenoid 2 (SS2)15-25 ohms
    Fan or Low Fan Control65-110 ohmsShift Solenoid 3 (SS3)15-25 ohms
    Fuel Pump (FP) Relay40-90 ohmsTCC Solenoid0.9-1.9 ohms
    High Electro Drive Fan50-100 ohmsAC WOT Cutout Relay1K minimum

    Output Device Resistance Chart for Association Vehicles

    ComponentOhm ValueComponentOhm Value
    Canister Purge Valve30-34 ohmsA/C WOT Cutout Relay1K minimum
    EPC Solenoid36-43 ohmsShift Solenoid 1, 2, 311-27 ohms
    EGR Control, Vent30-45 ohmsVRIS Solenoid 1, 235-40 ohms
    EGR Boost Solenoid90-110 ohmsShift Solenoid 1, 2, 311-27 ohms
    Idle Air Control Valve10.7-12 ohmsTCC Solenoid11-27 ohms

    NOTE
    An Amp Draw Test should not be done on output devices with a resistance of less than 25 ohms (or duty cycle controlled).

    Voltage to Mass Airflow Conversation Table

    Vehicle & Engine ApplicationMAF Volts 0.23v =MAF Volts 0.27v =MAF Volts 0.46v =MAF Volts 2.44v =
    Continental with 4.6L Engine1.07 gm/sec1.22 gm/sec2.08 gm/sec59.52 gm/sec

    NOTE
    Connect a Scan Tool and select the MAF PID. Read the value and compare it against the known good grams per second reading of that vehicle in the table. A faulty MAF sensor will be out of range.

    PID Data & Pin Chart Glossary

    Glossary of Terms and Acronyms
    (<): Indicates less than the value(>): Indicates more than the value
    ACCS: A/C Cycling Clutch SwitchACP: Air Conditioning Pressure Sensor
    AODE: Automatic Overdrive ElectronicA4R70W: Automatic Overdrive Electronic
    BOO: Brake On/Off SwitchCANP: EVAP Canister Purge Solenoid
    CES: Clutch Engage SwitchCCS: Coast Clutch Solenoid
    CKP: Crankshaft PositionCMP: Camshaft Position
    COP: Coil On Plug Electronic IgnitionCTM: Central Timer Module
    CTO: Clean Tachometer OutputDI: Distributor Ignition
    DIS: Direct Ignition (Waste Spark)DLC: Data Link Connector
    DPFE: Differential Pressure FeedbackDRL: Daytime Running Lights
    EBCM: Electronic Brake Control ModuleEBTCM: Electronic Brake T/C Module
    EFI: Electronic Fuel InjectionEGR: Exhaust Gas Recirculation
    EGRC: EGR Control SolenoidEGR Monitor: OBD II EGR Test
    EGRV: EGR Vent SolenoidEI: Electronic Ignition System
    EPC: Electronic Pressure ControlEPT: EGR Pressure Transducer
    EVAP: Evaporative Emission SystemEVAP CP: Evaporative Canister Purge
    EVAP CV: Evaporative Canister VentEVP: EGR Valve Position Sensor
    EVR: EGR Vacuum RegulatorFAN: Cooling Fan (Low or High Speed)
    FF: Flexible Fuel VehicleFIC: Fast Idle Control
    FEM: Front Electronic ModuleFMEM: Failure Mode Effect Management
    FDPM: Fuel Pump Driver ModuleFTO: Filtered Tachometer Output
    FPM: Fuel Pump Monitor (in the PCM)FTP: Fuel Tank Pressure
    GEM: Generic Electronic ModuleGOOSE: Brief throttle open/close
    GND: Electrical ground connectionGVW: Gross Vehicle Weight
    HDR-CKP: High Data Rate Crankshaft Position SensorHFC: High Fan Control, controls the high speed cooling fan
    HFP: High Fuel Pump (Relay) ControlHLOS: Hardware Limited Operating Strategy
    HO: High OutputHO2S: Heated Oxygen Sensor
    HO2S-11 (Bank 1 Sensor 1) SignalHO2S-12 (Bank 1 Sensor 2) Signal
    HO2S-21 (Bank 2 Sensor 1) SignalHO2S-22 (Bank 2 Sensor 2) Signal
    HSC: High Swirl CombustionIAC: Idle Air Control (solenoid)
    IAT: Intake Air TemperatureIC: Integrated Circuit
    ICM: Ignition Control ModuleIDL: Idle Position Switch
    IDM: Ignition Diagnostic MonitorIFS: Inertia Fuel Switch
    IGN GND: Ignition GroundIMRC: Intake Manifold Runner Control
    IMRC: Intake Manifold Runner ControlINJ 1 to INJ 10: Fuel Injectors 1 to 10
    EI: Integrated-Electronic IgnitionISO: International Standards Org.
    ITS: Idle Tracking SwitchKAM: Keep Alive Memory
    KAPWR: Direct Battery PowerKg/cm2: Kilograms/Cubic Centimeters
    KOEC: Key On, Engine CrankingKOEO: Key On, Engine Off
    KOER: Key On, Engine RunningKS: Knock Sensor (Bank 1 or Bank 2)
    LAMBSE: Short Term Fuel TrimLCD: Liquid Crystal Display
    LFC: Low Fan ControlLFP: Low Speed Fuel Pump (control)
    LONGFT: Long Term Fuel TrimLOS: Limited Operating Strategy
    LOOP: Engine Operating Loop StatusLPG: Liquid Petroleum Gas

    PID Data & Pin Chart Glossary

    Glossary of Terms and Acronyms
    M/T: Manual TransmissionMAF: Mass Airflow
    MAF RTN: Mass Airflow Sensor ReturnMAP: Manifold Absolute Pressure
    MCU: Microprocessor Control UnitMFI: Multiport Fuel Injection
    MIL: Malfunction Indicator LampMLP: Manual Lever Position (Sensor)
    MPH: Miles Per HourN.C.: Normally Closed
    NDS: Neutral Drive (Switch)N/V: Input shaft speed to vehicle speed
    NGV: Natural Gas VehiclesN.O.: Normally Open
    OASIS: Online Automotive Service Information SystemOBD I: On Board Diagnostics Version I OBD II: On Board Diagnostics Version II
    OCIL: Overdrive Cancel Indicator LampOCS: Overdrive Cancel Switch
    OCT ADJ: Octane Adjust Fuel (Switch)OHC: Overhead Cam Engine
    OSM: Output State MonitorOSS: Output Speed Shaft
    O2S-11 (Bank 1 Sensor 1) SignalO2S-21 (Bank 2 Sensor 1) Signal
    PAS: Passive Anti-Theft SystemPCM: Powertrain Control Module
    PCV: Positive Crankcase VentilationPFE: Pressure Feedback EGR System
    PFI: Port Fuel InjectionPID: Parameter Identification Location
    PIP: Profile Ignition Pickup SignalPMI: Programmable Module Installation
    PNP: Park Neutral PositionPSP: Power Steering Pressure (switch)
    PSOM: Programmable Speedometer Odometer ModuleRAM: Random Access Memory
    RCM: Restraint Control ModuleREM: Rear Electronic Module
    ROM: Read Only MemoryRPM: Revolutions Per Minute
    RTN: Dedicated sensor ground circuitRWD: Rear Wheel Drive
    SC: Supercharged EngineSCP: Standard Corporate Protocol
    SFI: Sequential Fuel InjectionSHRTFT1: Short Term Fuel Trim Bank 1
    SHO: Super High Output EngineSIG RTN: Signal Return
    SIL: Shift Indicator LampSPOUT: Spark Output signal
    SS: Shift SolenoidSTAR: Self Test Automatic Readout
    STI: Self Test InputSTO: Self Test Output
    TAB: Thermactor Air BypassTAD: Thermactor Air Diverter
    TC: Turbo ChargedTCC: Torque Converter Clutch
    TCC: Torque Converter Clutch ControlTCS: Traction Control Switch
    TCIL: Transmission Control Indicator LampTFT: Transmission Fluid Temperature
    TKS: Throttle Kicker SolenoidTOT: Transmission Oil Temperature
    TP: Throttle Position (Sensor)TP Mode: Throttle Position Mode
    TR: Transmission Range sensorTSB: Technical Service Bulletin
    TSS: Transmission Shaft Speed SensorTWC: Three Way Catalyst
    TWC + OC: 3-Way CatalystUBP: UART Based Protocol Network
    VAF: Vane Airflow Meter or sensorVAT: Vane Air Temperature sensor
    VID: Vehicle Information Block (memory)VIM: Vehicle Interface Module
    VBAT: Vehicle Battery VoltageVLCM: Variable Load Control Module
    VPWR: Ignition switched PowerVREF: Reference Voltage (from PCM)
    VRS: Variable Reluctance SensorVMV: Vapor Management Valve (EVAP)
    VCT: Variable Camshaft TimingWAC: WOT A/C Cutout Relay
    WACA- A/C WOT Cutout Relay MonitorWOT: Wide Open Throttle
    Application: Vehicles With EEC-IV & EEC-V Systems

    ACT, ECT, IAT, TFT & TOT Sensor Conversion Chart

    Temperature Voltage Resistance
    Degrees FDegrees CVoltsKohms
    3021600.120.54
    2671310.200.80
    2481200.281.18
    2301100.361.55
    2121000.472.07
    194900.612.8
    176800.83.84
    158701.045.37
    140601.357.6
    104402.1616.15
    86302.6224.27
    68203.0637.3
    50103.5258.75
    3203.9765.85
    14-104.4278.19
    -4-204.8790.54
    -22-304.89102.88
    -40-404.91115.23

    Differential Pressure Feedback EGR Sensor

    PressureVoltage
    PSIInches HgKPaVolts
    4.348.8329.814.56
    3.256.6222.363.54
    2.174.4114.902.51
    1.082.217.461.48
    0000.45

    Removal & Installation



    3.0L (VIN S) Engine
    1. Before servicing the vehicle, refer to the Precautions section.
    2.  
    3. Park the wiper pivot arms in the highest position on the glass.
    4.  
    5. Disconnect the battery ground cable.
    6.  
    7. Remove the three RH cowl panel clips and remove the RH cowl panel.
    8.  
    9. Remove the clip on the water shield.
    10.  
    11. Remove the three RH water shield screws and remove the RH water shield.
    12.  
    13. Disconnect the powertrain control module (PCM) electrical connector and remove the gasket.
    14.  
    15. Remove the retaining bolts and the PCM.
    16.  
    17. To install, reverse the removal procedure.
    18.  

    3.0L (VIN U, 2) Engines
    1. Before servicing the vehicle, refer to the Precautions section.
    2.  
    3. Park the wiper pivot arms in the highest position on the glass.
    4.  
    5. Disconnect the battery ground cable.
    6.  
    7. Remove the three RH cowl panel clips and remove the RH cowl panel.
    8.  
    9. Remove the clip on the water shield.
    10.  
    11. Remove the three RH water shield screws and remove the RH water shield.
    12.  
    13. Disconnect the evaporative emission (EVAP) canister purge valve return tube at the intake manifold and position aside.
    14.  
    15. Disconnect the powertrain control module (PCM) electrical connector and remove the gasket.
    16.  
    17. Remove the retaining bolts and the PCM.
    18.  
    19. To install, reverse the removal procedure.
    20.  

     
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