Engine Controls - System & Component Tests - Eec-V: Other Ford Pickup F250

Ground Circuits

1. Using a DVOM, check for continuity to ground at the following Powertrain Control Module (PCM) connector terminals. See «IDENTIFYING POWERTRAIN CONTROL MODULE PWR GND TERMINALS»(ref-161995-S36181893042004051100000) table. (Scheme 551) If continuity does not exist, repair open ground circuit as necessary. If continuity exists, go to next step. IDENTIFYING POWERTRAIN CONTROL MODULE PWR GND TERMINALS Application PCM Harness Connector Terminal No. Pickup 24, 51, 76, 77 & 103
2. Touch negative lead of DVOM to a good ground. With vehicle running, backprobe positive lead of DVOM to each ground terminal. DVOM should indicate less than one volt. If reading is greater than one volt, check for open, corrosion or loose connection on ground lead.

Power Circuits

Turn ignition off. Using a DVOM, check for battery voltage between ground and PCM terminal No. 55 (KAPWR). Turn ignition switch to START or RUN position. Check for battery voltage between ground and PCM connector terminals No. 71 and 97 (VPWR). If battery voltage is not present, power is not being supplied from EEC power relay. See CIRCUIT TEST B under CIRCUIT TESTS in appropriate TEST W/CODES article.

POWERTRAIN CONTROL MODULE LOCATION

Identifying Powertrain Control Module 104-Pin Connector Terminals. Scheme 551

ENGINE SENSORS & SWITCHES

Note. Component tests are included when provided by manufacturer. If component tests are not provided, see appropriate test in TEST W/CODES article when stated. For additional sensor specifications, see appropriate SENSOR RANGE CHARTS article.

BRAKE ON/OFF SWITCH

For Brake On/Off (BOO) switch testing procedure and specifications, see CIRCUIT TEST FD under CIRCUIT TESTS in appropriate TEST W/CODES article.

CLUTCH PEDAL POSITION SWITCH

For Clutch Pedal Position (CPP) switch testing procedure and specifications, see CIRCUIT TEST TA under CIRCUIT TESTS in appropriate TEST W/CODES article.

ENGINE COOLANT TEMPERATURE SENSOR

Engine Coolant Temperature (ECT) sensor uses a 5-volt reference voltage during engine operation. To check ECT signal voltage, backprobe between signal terminal and ground with engine running. To check sensor resistance, disconnect sensor and measure resistance between sensor terminals. For specifications, see ENGINE COOLANT TEMPERATURE SENSOR SPECIFICATIONS table. For additional testing information, see CIRCUIT TEST DA under CIRCUIT TESTS in appropriate TEST W/CODES article.

ENGINE COOLANT TEMPERATURE SENSOR SPECIFICATIONS (1)

HEATED OXYGEN SENSOR

1. Faults in Heated Oxygen Sensor (HO2S) or circuit should set a Diagnostic Trouble Code (DTC). Perform QUICK TEST in appropriate TESTS W/CODES article. If no DTC has been set, check HO2S HTR resistance. Using a DVOM, measure resistance between HO2S HTR GND and VPWR terminals. See appropriate WIRING DIAGRAMS article. If resistance is 3-30 ohms, HO2S HTR circuit is okay, go to next step. If resistance is not 3-30 ohms, replace HO2S sensor.
2. With ignition off. Measure resistance between HO2S HTR GND terminal and HO2S case. Measure resistance between HO2S HTR GND and SIG RTN terminals. Measure resistance between HO2S VPWR terminal and HO2S case. If each resistance measurement is more than 10 k/ohms, HO2S is okay. If any resistance is 10 k/ohms or less, replace HO2S. For additional testing information, see CIRCUIT TEST H under CIRCUIT TESTS in appropriate TEST W/CODES article.

INERTIA FUEL SHUTOFF SWITCH

Ensure ignition is off. Inertia Fuel Shutoff (IFS) switch is located behind right kick panel. Shake or lightly tap on IFS switch to cause switch to open and reset button should pop up. Fuel pump should not operate and car should stall. Push down on reset button. Fuel pump should operate.

INTAKE AIR TEMPERATURE SENSOR

Intake Air Temperature (IAT) sensor uses a 5-volt reference voltage during engine operation. To check IAT signal voltage, backprobe between signal terminal and ground with engine running. To check sensor resistance, disconnect sensor and measure resistance between sensor terminals. For specifications, see INTAKE AIR TEMPERATURE SENSOR SPECIFICATIONS table. For additional testing information, see CIRCUIT TEST DA under CIRCUIT TESTS in appropriate TESTS W/CODES article.

INTAKE AIR TEMPERATURE SENSOR SPECIFICATIONS (1)

MASS AIRFLOW SENSOR

Faults in Mass Airflow (MAF) sensor or circuit should set a Diagnostic Trouble Code (DTC). See QUICK TEST in appropriate TESTS W/CODES article. If no DTC has been set, go to CIRCUIT TEST DC under CIRCUIT TESTS in appropriate TESTS W/CODES article for MAF sensor and circuit testing.

MISFIRE DETECTION SENSOR

Faults in Misfire Detection (MD) sensor or circuit should set a Diagnostic Trouble Code (DTC). See QUICK TEST in appropriate TESTS W/CODES article. If no DTC has been set, go to CIRCUIT TEST DK under CIRCUIT TESTS in appropriate TESTS W/CODES article for MD sensor and circuit testing.

PARK/NEUTRAL POSITION SWITCH

For Park/Neutral Position (PNP) switch test procedures, see CIRCUIT TEST TA under CIRCUIT TESTS in appropriate TEST W/CODES article.

POWER STEERING PRESSURE SWITCH

For Power Steering Pressure (PSP) switch test procedures, see CIRCUIT TEST FF under CIRCUIT TESTS in appropriate TEST W/CODES article.

THROTTLE POSITION SENSOR

Ensure none of following conditions exist

1. Binding throttle linkage.
2. TP sensor loose or not seated properly.
3. Throttle plate not fully closed.

Faults in TP sensor or circuit should set a Diagnostic Trouble Code (DTC). See QUICK TEST in appropriate TESTS W/CODES article. If no DTC has been set, see CIRCUIT TEST DH under CIRCUIT TESTS in appropriate TESTS W/CODES article for additional sensor and circuit testing.

TRANSMISSION CONTROL SWITCH

For Transmission Control Switch (TCS) test procedures, see CIRCUIT TEST TB under CIRCUIT TESTS in appropriate TEST W/CODES article.

VEHICLE SPEED SENSOR

Faults in Vehicle Speed Sensor (VSS) or circuit should set a Diagnostic Trouble Code (DTC). See QUICK TEST in appropriate TESTS W/CODES article. If no DTC has been set, go to CIRCUIT TEST DP under CIRCUIT TESTS in appropriate TESTS W/CODES article for VSS and circuit testing.

EGR VACUUM REGULATOR SOLENOID

For diagnostic procedures for EGR Vacuum Regulator (EVR) solenoid, see EGR VACUUM REGULATOR SOLENOID under EXHAUST GAS RECIRCULATION under EMISSION SYSTEMS & SUB-SYSTEMS.

FUEL PUMP RELAY

Note. To identify fuel pump relay terminals, refer to numbers molded on relay. Two different numbered relays are used. Fuel pump relay terminals may be numbered 1-5 or terminals may be numbered 30, 85, 86, 87 and 87A. On relays that are numbered 1-5; terminals for relay coil are terminals No. 1 and 2. On relays that are numbered 30, 85, 86, 87 and 87A; terminals for relay coil are terminals No. 85 and 86.

1. Turn ignition off. On fuel pump relays that terminals are numbered 1-5, measure resistance between relay terminal No. 1 and all other relay terminals. Resistance should be 40-120 ohms between terminals No. 1 and 2 and more than 10 k/ohms between terminal No. 1 and other relay terminals.
2. On fuel pump relays that terminals are numbered 30, 85, 86, 87 and 87A, measure resistance between relay terminal No. 85 and all other relay terminals. Resistance should be 40-120 ohms between terminals No. 85 and 86 and more than 10 k/ohms between terminal No. 85 and other relay terminals. On both relays, if resistance is not as specified replace relay. If resistance is okay, see TEST KA under CIRCUIT TESTS in appropriate TESTS W/CODES article for additional fuel pump circuit testing procedures.

IDLE AIR CONTROL SOLENOID

1. Idle Air Control (IAC) solenoid is a by-pass air type. Ensure ignition is off. Disconnect IAC solenoid harness connector. Measure resistance between IAC solenoid connector terminals. Solenoid has an internal diode. Connect positive lead from DVOM to VPWR terminal and negative lead to IAC terminal. Resistance should be 6-13 ohms. If resistance is not 6-13 ohms, replace solenoid. If resistance is 6-13 ohms, go to next step.
2. Measure resistance between either IAC solenoid terminal and IAC solenoid case. If resistance is 10 k/ohms or less, replace IAC solenoid. If resistance is more than 10 k/ohms, IAC solenoid may be okay. See CIRCUIT TEST KE under CIRCUIT TESTS in appropriate TESTS W/CODES article for additional testing and specifications.

VAPOR MANAGEMENT VALVE

For diagnostic procedures for Vapor Management Valve (VMV), see VAPOR MANAGEMENT VALVE under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS.

With Fuel Pressure Gauge

Remove fuel cap to release fuel tank pressure. Remove relief valve cap. Relief valve is located on fuel supply manifold. Using Fuel Pressure Gauge (T80L-9974-B), release fuel pressure from relief valve (Schrader valve).

Without Fuel Pressure Gauge

If fuel pressure gauge is not available, disconnect Inertia Fuel Shutoff (IFS) switch. IFS is located behind right kick panel. Remove fuel cap to release fuel tank pressure. Crank engine for 15 seconds to release system pressure. Turn ignition off. Reconnect IFS switch connector.

FUEL DELIVERY

Note. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article.

See FUEL PUMP RELAY under MODULES, MOTORS, RELAYS & SOLENOIDS.

1. 1) System Integrity Check Perform the following checks: Visually inspect fuel system (fuel lines, filter, pump, injectors, pressure regulator, etc.). Ensure Inertia Fuel Shutoff (IFS) switch reset button is not in upper (tripped) position. Ensure battery is fully charged and fuel-related fuses are okay. Check fuel tank contents and fuel gauge accuracy. On vehicles with 2 fuel tanks, check both tanks. If any fault is detected, repair as necessary. If system checks are okay, go to next step.
2. 2) Check Fuel Pressure Install fuel pressure gauge. Check and record fuel pressure. See «FUEL PRESSURE SPECIFICATIONS»(ref-123323) article. If fuel pressure is as specified, testing is complete. If fuel pressure is not as specified, go to CIRCUIT TEST HC, step 1) under CIRCUIT TESTS in appropriate TEST W/CODES article.

FUEL PRESSURE REGULATOR

See CIRCUIT TEST HC under CIRCUIT TESTS in appropriate TEST W/CODES article.

Fuel Injector Resistance

Disconnect injector harness connectors. Using DVOM, measure resistance between injector terminals. Resistance should be 11-18 ohms. Replace any injector not within specification.

Fuel Injector Check

Start engine and allow to idle. If engine will not start, crank engine for 10 seconds. Using a stethoscope, listen for clicking sound at each injector. If clicking sound is heard, fuel injector is operating. If clicking sound is not heard, go to CIRCUIT TEST HD, step 8) under CIRCUIT TESTS in appropriate TEST W/CODES article.

Turn ignition off. Disconnect Idle Air Control I(AC) solenoid wiring harness connector. Connect DVOM positive lead to VPWR terminal of IAC solenoid wiring harness connector. See appropriate WIRING DIAGRAMS article. Connect DVOM negative lead to IAC terminal. If resistance is 6-13 ohms, go to next step. If resistance is not 6-13 ohms, replace IAC valve assembly.

Preliminary Check

Perform following preliminary checks

1. Visually inspect engine compartment to verify vacuum hoses and spark plug wires are properly routed and securely connected.
2. Examine all wiring harnesses and connectors for damage.
3. Ensure all ground connections are clean and tight.
4. Ensure battery is fully charged.
5. All accessories should be off during diagnosis.

EXHAUST CATALYST

Note. Perform CIRCUIT TEST HF under CIRCUIT TESTS in appropriate TEST W/CODES article.

SECONDARY AIR INJECTION

Note. For diagnostic procedures, go to CIRCUIT TEST HM under CIRCUIT TESTS in appropriate TEST W/CODES article.

Differential Pressure Feedback EGR Sensor

To diagnose the Differential Pressure Feedback EGR (DPFE) sensor, go to CIRCUIT TEST HE under CIRCUIT TESTS in appropriate TEST W/CODES article.

EGR Valve

1. Ensure all vacuum hoses are correctly routed and securely attached. Replace any crimped or broken hoses. Ensure there is less than one in. Hg vacuum to EGR valve at idle with engine at normal operating temperature.
2. Install tachometer. Disconnect Idle Air Control (IAC) wiring harness connector. Remove and plug vacuum hose at EGR valve. Start engine and allow to idle in Neutral. Note idle speed. Using hand vacuum pump, slowly apply 5-10 in. Hg vacuum to EGR valve. When vacuum is fully applied, engine should do one or more of the following: Engine should stall. Idle speed should drop more than 100 RPM. Idle speed should return to normal when vacuum is released. Service or replace EGR valve if engine does not stall or idle speed does not respond as specified. Reconnect IAC harness connector. Unplug and reconnect vacuum hose at EGR valve.

Turn ignition off. Disconnect EGR Vacuum Regulator (EVR) solenoid wiring harness connector. Measure resistance across EVR solenoid terminals. If resistance is not 26-40 ohms, replace EVR solenoid. For additional testing, go to CIRCUIT TEST HE under CIRCUIT TESTS in appropriate TEST W/CODES article.

EVAP Canister

There are no moving parts in canister. Check for loose, missing, cracked or broken connections and parts. Repair or replace as necessary. There should be no liquid in canister.

Canister Purge Valve/Vapor Management Valve

Turn ignition off. Disconnect Canister Purge Valve (CVP)/Vapor Management Valve (VMV) wiring harness connector. Using DVOM, measure resistance between CVP/VMV SIG and VPWR terminals. If resistance is not 30-36 ohms, replace CVP/VMV. If resistance is 30-36 ohms, sensor is okay. If fault is still present, go to CIRCUIT TEST HX under CIRCUIT TESTS in appropriate TEST W/CODES article.

POSITIVE CRANKCASE VENTILATION

1. Check Positive Crankcase Ventilation (PCV) Valve Remove PCV valve. Shake valve and listen for rattle. If PCV valve rattles when shaken, go to next step. Replace PCV valve if it does not rattle when shaken.
2. Check PCV System Start engine and warm to normal operating temperature. Disconnect hose from remote air cleaner or outlet tube. Place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, repair clogged or leaking hose as necessary. If vacuum from hose holds paper in place for one minute, PCV system is okay and testing is complete.