Lincoln Aviator, Ford Explorer, Exp Sport, Exp Sport-Trac, Mercury Mountaineer 2000-2005

Powertrain Control Module (PCM)



The Powertrain Control Module (PCM) performs many functions on your car. 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.

The PCM carries out the following functions:

Accepts input from various engine sensors to compute the fuel flow rate necessary to maintain a prescribed air/fuel ratio throughout the entire engine operational range.
Outputs a command to the fuel injectors to meter the appropriate quantity of fuel.

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

Vehicles with EEC-V and 5.0L V8 (VIN P) Engine

EGR Valve Position (EVP) Sensor

Percent of EGRVoltageCode Set Values
0% (valve closed)0.40vHot Idle: A code sets if the EVP
10% (valve open)0.75vSensor voltage is less than 0.24v or
30% (valve open)1.45vIf the EVP signal is more than 0.67v
50% (valve open)2.15v  
70% (valve open)2.85v  
90% (valve open)3.55v  

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

EGR Vacuum Regulator (EVR) Solenoid Vacuum Examples

Duty   Vacuum     Output  
Cycle (%)Min   Nom   Max  

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 (2000-2005 Models)

Vehicle & Engine ApplicationMAF Volts 0.23v =MAF Volts 0.27v =MAF Volts 0.46v =MAF Volts 2.44v =
Explorer & Mountaineer 4.0L & 5.0L Engines0.97 gm/sec1.11 gm/sec1.90 gm/sec49.97 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.

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

Differential Pressure Feedback EGR Sensor

PSIInches HgKPaVolts

Removal & Installation

Before starting removal procedure, all programmable module information must be downloaded from the PCM using a proper scan tool and software. If you do not have the proper equipment, refer the vehicle to a qualified repair facility for this procedure.

  1. Disconnect the negative battery cable.
  3. Loosen the bolts and disconnect the Powertrain Control Module (PCM) electrical connectors.
  5. Remove the PCM bracket nuts.
  7. Remove the passenger door scuff plate, position the front door weatherstrip aside, and remove the A-pillar lower trim panel.
  9. Remove the screws and the glove compartment.
  11. Remove the PCM bracket bolt and the PCM and bracket as an assembly.
  13. Remove the PCM from the bracket.

To install:

  1. Position the PCM into its bracket.
  3. Install the PCM and bracket into place and tighten the bracket bolt to 89 inch lbs. (10 Nm).
  5. Install the following:
    After installation, the PCM must be reprogrammed, using proper scan tool and software. If you do not have the proper equipment, refer the vehicle to a qualified repair facility for this procedure.

    Glove compartment
    A-pillar lower trim panel
    Door weatherstrip
    Door scuff plate
    PCM bracket nuts; tighten to 71 inch lbs. (8 Nm)
    PCM electrical connectors; tighten the bolts to 62 inch lbs. (7 Nm)
    Battery ground cable.



For additional testing data, see -PID Charts- and -PIN Charts- sections.

Click image to see an enlarged view

Fig. PCM connector pin identification