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Engine Controls - Trouble Shooting - No Codes - Cng, Flex-Fuel & Gasoline: Other Ford Explorer III

Testing & Diagnostics ~5610 words

ROUGH OR ROLLING IDLE, STALLS, MISSES, HESITATION OR SURGE

WARNINGOn some models, vehicle may stall if engine is left running during refueling. Advise customer to always turn engine off during refueling to avoid contamination or damage to EVAP system.

Note. The Powertrain Control Module (PCM) is equipped with an over RPM/speed limiting function that will shut off fuel delivery when predetermined engine speed is exceeded.

Preliminary Checks

Check for vacuum leaks. Check air intake duct and air filter. Check ignition wiring. Check fuel quality (octane, winter/summer grade fuel, methanol, etc.). Check wiring harness connector for poor connections.

Engine Runs Rough At Idle

Turn ignition switch to ON position. Using scan tool, select INJxF PIDs from PID/DATA MONITOR & RECORD menu. There is one INJxF PID available for each engine cylinder, and the "x" indicates the appropriate injector number (1-10). AllINJxF PIDs should indicate NO (no fault). If any INJxF PID value indicates YES, an injector fault exists. Go to TEST HA: NATURAL GAS FUEL CONTROL , step 60) (Natural Gas models), or go to TEST H: FUEL CONTROL , step 56) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Engine Now Starts, But Stalls In Park Or Neutral

If engine will start and run normally at part throttle, check Idle Air Control (IAC) system. Go to TEST KE: IDLE AIR CONTROL VALVE , step 2) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Miscellaneous Component Or System Checks

Check the following

  1. Check Mass Air Flow (MAF) sensor. Go to «TEST DC: MASS AIRFLOW SENSOR»(ref-152182-S32366536882003012000000) , step 25) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check secondary ignition system. Go to «TEST JB: SECONDARY IGNITION»(ref-152182-S24361161942003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  3. Check fuel delivery system. Go to «TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM»(ref-152182-S07605800792003012000000) , step 1) (Natural Gas models), or go to «TEST HC: GASOLINE FUEL DELIVERY SYSTEM»(ref-152182-S37644316462003012000000) , step 1) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  4. Check exhaust system for restriction. Go to «TEST HF: CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS»(ref-152182-S21104827552003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  5. Check PCV system. For Aviator and Mustang 4.6L, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. For all others, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 4) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  6. Check EVAP emission system for blockages (engine stalls) or leaks (excessive fuel odor). Service appropriate symptom under «SYSTEM TESTS (EVAPORATIVE EMISSION)»(ref-152182-S40226187012003012000000) in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  7. On A/T models, ensure transmission is functioning properly. If engine stalls during transmission engagement, check transmission solenoids. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
  8. Check engine mechanical condition. Check compression, camshaft, valve train components, etc. and repair as necessary. See appropriate article in ENGINES.
  9. Check air intake system. Go to «TEST HU: AIR INTAKE SYSTEM»(ref-152182-S08327650632003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Natural Gas Vehicles With Rough Idle

Check injector circuits between Natural Gas (NG) module and injectors. Go to TEST HA: NATURAL GAS FUEL CONTROL , step 57) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Idle Concerns With A/C On (3-Wire Sensor)

Check A/C Pressure (ACP) sensor input to PCM. Go to TEST DS: AIR CONDITIONING PRESSURE SENSOR , step 22) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Additional Checks

Note. Some applications have a PID that will indicate whether the PCM is reducing torque (TQ_CNTL)(#095E b0), and if so, why the torque is being reduced (#095Eb1-13) (0 = No torque reduction requested; 1 = Torque Truncation. Cuts fuel to protect when line pressure fails to minimum limit; 2 = Traction Control Event. Cuts fuel and/or spark for traction control; 3 = Vehicle Speed Limit - Cuts fuel).

Ensure Powertrain Control Module (PCM) Vehicle Identification (VID) block is correct. See FLASH VEHICLE IDENTIFICATION BLOCK PROCEDURE under PROGRAMMING PCM in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Check engine RPM/speed limiting functions of PCM. Check for incorrect high vehicle speed signal from ABS, VSS or OSS. Check driveline(s), manual transmission or clutch assembly. Check charging system. See appropriate GENERATORS & REGULATORS article in ELECTRICAL. Check traction control system, if equipped. If engine surges with A/C on, or has a rolling idle and/or engine stumble when A/C cycles on, check A/C system and A/C compressor diode. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. Check cruise control system if engine surges with cruise control on. See appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.

Check battery condition and starter current draw.

Check the following

  1. Check secondary ignition system. Go to «TEST JB: SECONDARY IGNITION»(ref-152182-S24361161942003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check fuel delivery system. Go to «TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM»(ref-152182-S07605800792003012000000) , step 1) (Natural Gas models), or go to «TEST HC: GASOLINE FUEL DELIVERY SYSTEM»(ref-152182-S37644316462003012000000) , step 1) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  3. Check exhaust system for restriction. Go to «TEST HF: CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS»(ref-152182-S21104827552003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  4. Check PCV system. For Aviator and Mustang 4.6L, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. For all others, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 4) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  5. Check EVAP emission system for blockages (engine stalls) or leaks (excessive fuel odor). Service appropriate symptom under «SYSTEM TESTS (EVAPORATIVE EMISSION)»(ref-152182-S40226187012003012000000) in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  6. Check air intake system. Go to «TEST HU: AIR INTAKE SYSTEM»(ref-152182-S08327650632003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  7. Check starting system. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
  8. Check Mass Airflow (MAF) sensor for contamination.
  9. Check high speed fuel pump secondary circuits (Lightning 5.4L SC models only). Go to «TEST KA: FUEL PUMP RELAY»(ref-152182-S39784600332003012000000) , step 70) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  10. Check Idle Air Control (IAC) system. Go to «TEST KE: IDLE AIR CONTROL VALVE»(ref-152182-S27651188682003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

NO-START/NORMAL CRANK

CAUTIONExtended cranking, due to a no-start condition, can load exhaust system with raw fuel, which can damage catalytic converter after engine is started.

After repairing a no-start condition on models with electric Secondary Air Injection (AIR) system, disconnect AIR solid state relay. Start and run engine until surplus fuel is used, and then reconnect relay. Disconnecting AIR solid state relay may set a Continuous Memory DTC. After repairs are completed, clear DTCs. See CLEARING CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Check Inertia Fuel Shutoff (IFS) switch. Check fuel pressure and quality (octane, winter/summer grade fuel, methanol, etc.). Check add-on alarm/anti-theft devices. Check wiring harness connectors. Check for disconnected or restricted air intake duct. Check fuses and relays.

Check the following

  1. Check fuel and ignition systems. Go to «TEST KB: FUEL PUMP DRIVER MODULE»(ref-152182-S21600353162003012000000) , step 85) (LS and Thunderbird), or go to «TEST A: NO-START»(ref-152182-S11334851662003012000000) , step 1) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check exhaust system for restriction. Go to «TEST HF: CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS»(ref-152182-S21104827552003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  3. Check engine mechanical condition. Check compression, camshaft, valve train components, etc. See appropriate article in ENGINES.

Engine Will Now Start & Run Normally At Part Throttle

If engine starts and runs only at part throttle, check Idle Air Control (IAC) system. Go to TEST KE: IDLE AIR CONTROL VALVE , step 2) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Check for vacuum leaks. Check throttle linkage operation. Check throttle body.

Check the following

  1. Check PCV system. For Aviator and Mustang 4.6L, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. For all others, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 4) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check air intake system. Go to «TEST HU: AIR INTAKE SYSTEM»(ref-152182-S08327650632003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  3. Check Idle Air Control (IAC) system. Go to «TEST KE: IDLE AIR CONTROL VALVE»(ref-152182-S27651188682003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Note. If engine runs normally after ignition switch is turned to OFF position, check for damaged ignition switch or IGN RUN or VPWR circuit for short to power. See WIRING DIAGRAMS .

Check for vacuum leaks. Check for deposits on throttle plate. Check throttle linkage operation. Check for binding/sticking cruise control linkage. Check for air intake duct leaks. Check for leaking intake manifold gasket. Check Idle Air Control (IAC) or Exhaust Gas Recirculation (EGR) valves. Ensure vehicle is at normal operating temperature.

Engine Idles Fast

Turn ignition switch to OFF, then back to ON position. Using scan tool, select TP V and TPREL PIDs from PID/DATA MONITOR & RECORD menu. Observe TP V and TPREL PIDs while wiggling TP sensor circuits. At vehicle start, TPREL PID value will begin at about 1.25 volts and count down to the lowest TP V value read since engine start-up. If TP V value goes below normal range, then increases again, TPREL will set to the lower voltage. If TP V is about .04 volt more than TPREL value at closed throttle, PCM will go into part throttle mode. Check for loose or worn throttle plates. If no concern is found, go to TEST Z: INTERMITTENT , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article and check for intermittent faults.

  1. Check air intake system. Go to «TEST HU: AIR INTAKE SYSTEM»(ref-152182-S08327650632003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check Idle Air Control (IAC) system. Go to «TEST KE: IDLE AIR CONTROL VALVE»(ref-152182-S27651188682003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Check Idle Air Control (IAC) wiring harness connector. Check for vacuum leaks. Ensure vacuum hoses are routed properly. Check air intake duct.

Stall Or Quit On Deceleration (A/T Models)

Check Torque Converter Clutch (TCC), TCC solenoid or TCC circuit may not be functioning properly. See appropriate OVERHAUL or DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

Low Idle With A/C On (Econoline 4.6L, 5.4L & 6.8L)

Check ACCS PID. Connect scan tool to Data Link Connector (DLC). Start engine and allow to idle. Using scan tool, access ACCS PID from PID/DATA MONITOR & RECORD menu. With A/C clutch engaged, ACCS PID value should indicate ON. On models where PCM cannot control A/C clutch on and off, PCM uses ACCS circuit to determine additional load on engine. If ACCS PID does not indicates ON, go to TEST KM: A/C CLUTCH RELAY & A/C CIRCUITS , step 10) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Check the following

  1. Check fuel delivery system. Go to «TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM»(ref-152182-S07605800792003012000000) , step 1) (Natural Gas models), or go to «TEST HC: GASOLINE FUEL DELIVERY SYSTEM»(ref-152182-S37644316462003012000000) , step 1) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check air intake system. Go to «TEST HU: AIR INTAKE SYSTEM»(ref-152182-S08327650632003012000000) TEST HU, step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  3. Check fuel filler cap for damage or improper installation. Repair as necessary.
  4. Check engine mechanical condition. Check compression, camshaft, valve train components, etc. and repair as necessary. See appropriate article in ENGINES.

Check vacuum hose routing. Check spark plug wiring (if equipped) for incorrect firing order.

Check the following

  1. Check secondary ignition system. Go to «TEST JB: SECONDARY IGNITION»(ref-152182-S24361161942003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check fuel delivery system. Go to «TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM»(ref-152182-S07605800792003012000000) , step 1) (Natural Gas models), or go to «TEST HC: GASOLINE FUEL DELIVERY SYSTEM»(ref-152182-S37644316462003012000000) , step 1) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  3. Check engine mechanical condition. Check compression, camshaft, valve train components, etc. and repair as necessary. See appropriate article in ENGINES.
  4. Check exhaust system for restriction. Go to «TEST HF: CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS»(ref-152182-S21104827552003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

LACK/LOSS OF POWER

Note. Ensure symptom is reported under normal driving conditions without excessive engine/vehicle load. PCM is equipped with an engine RPM/speed limit function. If programmed speed is exceeded, fuel delivery will shut off and DTC P1270 will be set in PCM memory. If vehicle is equipped with a Knock Sensor (KS), a lack of power may result when vehicle is operated with a breakout box installed at PCM. KS circuits are not shielded in the breakout box, and KS signal noise may be noticed by PCM. If this happens, spark timing will be retarded and a lack of power may result.

Check vacuum hose routing. Check for restricted air filter. Check wiring harness connectors. Check throttle linkage. Check for obstructed radiator. Check Automatic Transmission Fluid (ATF) level.

Check the following

  1. Check fuel delivery system. Go to «TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM»(ref-152182-S07605800792003012000000) , step 1) (Natural Gas models), or go to «TEST HC: GASOLINE FUEL DELIVERY SYSTEM»(ref-152182-S37644316462003012000000) , step 1) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check secondary ignition system. Go to «TEST JB: SECONDARY IGNITION»(ref-152182-S24361161942003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  3. Check Mass Air Flow (MAF) sensor. Go to «TEST DC: MASS AIRFLOW SENSOR»(ref-152182-S32366536882003012000000) , step 25) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  4. Check exhaust system for restriction. Go to «TEST HF: CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS»(ref-152182-S21104827552003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  5. Check engine compression. Check engine mechanical condition and repair as necessary. Check intake manifold gasket, camshaft and valves. See appropriate article in ENGINES.
  6. On A/T models, diagnose by symptom (POOR PERFORMANCE). See appropriate OVERHAUL or DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
  7. Check for binding or dragging brakes. See appropriate article in BRAKES.

Lack/Loss Of Power (Mustang Only)

Ensure A/C clutch disengages under Wide Open Throttle (WOT) conditions and engages a few seconds after returning to idle. If A/C does not cut off, see A/C DOES NOT TURN OFF DURING WOT (MUSTANG) symptom under CLIMATE CONTROL (LACK OF A/C COOLING, A/C ALWAYS ON OR A/C INOPERATIVE).

Lack/Loss Of Power (F150 Lightning 5.4L SC Only)

Also check high speed fuel pump secondary circuits. Go to TEST KJ: SUPERCHARGER BY-PASS CONTROL , step 70) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Note. Some models use a PID that will indicate whether PCM is reducing torque (095E b0), and if so, why torque is being reduced (095Eb1-13). Refer to scan tool manufacturer's operating instructions.

Check customer driving habits. Ensure Powertrain Control Module (PCM) Vehicle Identification (VID) block is correct. See FLASH VEHICLE IDENTIFICATION BLOCK PROCEDURE under PROGRAMMING PCM in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Check Intake Manifold Runner Control (IMRC) linkage, if equipped. Check manual transmission or clutch assembly. Check charging system. See appropriate GENERATORS & REGULATORS article in ELECTRICAL. Check engine RPM/speed limiting functions of PCM. Check for incorrect high vehicle speed signal from ABS, VSS or OSS.

Ensure engine is not exceeding normal operating temperature. Check cooling system for overheating, correct coolant level and coolant concentration. If cooling system is overheating, repair as necessary. See appropriate article in ENGINE COOLING.

Check the following

  1. Check Mass Air Flow (MAF) sensor input to PCM. Go to «TEST DC: MASS AIRFLOW SENSOR»(ref-152182-S32366536882003012000000) , step 25) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check engine mechanical condition. Check compression, camshaft, valve train components, etc. and repair as necessary. Check engine oil quality. See appropriate article in ENGINES.
  3. Check fuel delivery system. Go to «TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM»(ref-152182-S07605800792003012000000) , step 1) (Natural Gas models), or go to «TEST HC: GASOLINE FUEL DELIVERY SYSTEM»(ref-152182-S37644316462003012000000) , step 1) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  4. Check secondary ignition system. Go to «TEST JB: SECONDARY IGNITION»(ref-152182-S24361161942003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  5. Check PCV system. For Aviator and Mustang 4.6L, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. For all others, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 4) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  6. Visually inspect engine oil quality.

POOR FUEL ECONOMY

Note. Fuel consumption can be increased during stop-and-go driving, trailer towing, short-run operation, extended winter warm-up periods, improper tire inflation or size, high speed driving, improper axle ratio, road and weather conditions, and aftermarket add-ons. Determine if any of these factors are the cause of poor fuel mileage before proceeding with diagnostic procedure.

Check for restricted air filter/air intake duct. Check Automatic Transmission Fluid (ATF) level. Check fuel quality and coolant level. Ensure engine is operating at normal operating temperature. Check cooling system for stuck open or closed thermostat, correct coolant level or coolant concentration. Repair as necessary. See appropriate article in ENGINE COOLING.

Check the following

  1. Check secondary ignition system. Go to «TEST JB: SECONDARY IGNITION»(ref-152182-S24361161942003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check fuel delivery system. Go to «TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM»(ref-152182-S07605800792003012000000) , step 1) (Natural Gas models), or go to «TEST HC: GASOLINE FUEL DELIVERY SYSTEM»(ref-152182-S37644316462003012000000) , step 1) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  3. Check exhaust system for restriction. Go to «TEST HF: CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS»(ref-152182-S21104827552003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  4. On A/T models, diagnose by symptom (POOR PERFORMANCE). See appropriate OVERHAUL or DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
  5. Check PCV system. For Aviator and Mustang 4.6L, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. For all others, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 4) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Ensure Powertrain Control Module (PCM) Vehicle Identification (VID) block is correct. See FLASH VEHICLE IDENTIFICATION BLOCK PROCEDURE under PROGRAMMING PCM in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Check for binding or dragging brakes. See appropriate article in BRAKES. Check engine mechanical condition. Check for incorrect PCV valve. Check intake manifold gasket, camshaft and valves and repair as necessary. See appropriate article in ENGINES. Check for contaminated Mass Airflow (MAF) sensor. Check air intake system.

VEHICLE FAILS EMISSIONS/EMISSIONS COMPLIANCE

For emissions compliance procedures, see EMISSIONS COMPLIANCE under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - GASOLINE article.

HISSING SOUND WHEN REMOVING FUEL CAP

For diagnostic procedures, see HISSING SOUND WHEN REMOVING FUEL CAP symptom under SYSTEM TESTS (EVAPORATIVE EMISSION) in SYSTEM & COMPONENT TESTING - GASOLINE article.

EXCESSIVE FUEL ODOR

For diagnostic procedures, see EXCESSIVE FUEL ODOR symptom under SYSTEM TESTS (EVAPORATIVE EMISSION) in SYSTEM & COMPONENT TESTING - GASOLINE article.

UNABLE TO REFUEL VEHICLE

For diagnostic procedures, see UNABLE TO REFUEL VEHICLE symptom under SYSTEM TESTS (EVAPORATIVE EMISSION) in SYSTEM & COMPONENT TESTING - GASOLINE article.

WARNING INDICATOR LIGHTS

Note. If exhaust emission test fails and Malfunction Indicator Light (MIL) is on, perform EMISSIONS COMPLIANCE procedures under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - GASOLINE article. If MIL is illuminated and engine is a no-start, perform NO START/NORMAL CRANK symptom diagnosis first. If MIL is illuminated and engine runs rough at idle, perform ROUGH OR ROLLING IDLE, STALLS, MISSES, HESITATION OR SURGE symptom diagnosis first.

The following warning indicators may illuminate

  1. Malfunction Indicator Light (MIL)
  2. Transmission Control Indicator Light (TCIL)
  3. Shift Indicator Light (SIL)
  4. Temperature Warning Indicator Light Or Gauge - Models With Cylinder Head Temperature (CHT) Sensor
  5. Check Fuel Cap Indicator Light

Preliminary Check

Check wiring harness connectors. Ensure fuel filler cap is installed and tightened properly.

Pickups With Power Takeoff (PTO) & MIL Concern

Check PTO input to PCM. Go to TEST FB: POWER TAKE OFF , step 3) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

MIL Always On When Engine Is Running, No DTCs Are Present

Check MIL circuits. On Aviator, Escape, Expedition, Focus, F150 Pickup, LS, Mustang, Navigator, Thunderbird, Town Car or Windstar, see appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. On all other models, go to TEST NB: MALFUNCTION INDICATOR LIGHT , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

TCIL Always On When Engine Is Running, No DTCs Are Present

Check TCIL circuits. On Aviator, Expedition, Focus, LS, Mustang, Navigator, Thunderbird, Town Car or Windstar, see appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. On all other models, go to TEST TB: TRANSMISSION CONTROL SWITCH/TRANSMISSION CONTROL INDICATOR LAMP , step 6) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

MIL Inoperative (Including Bulb Check When Engine Is First Started)

Check MIL circuits. On Aviator, Escape, Expedition, Focus, F150 Pickup, LS, Mustang, Navigator, Thunderbird, Town Car or Windstar, see appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. On all other models, go to TEST NB: MALFUNCTION INDICATOR LIGHT , step 2) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Transmission Control Indicator (TCIL) Inoperative

Check TCIL circuits. On Aviator, Expedition, Focus, LS, Mustang, Navigator, Thunderbird, Town Car or Windstar, see appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. On all other models, go to TEST TB: TRANSMISSION CONTROL SWITCH/TRANSMISSION CONTROL INDICATOR LAMP , step 8) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Temperature Warning Indicator Light Or Temperature Gauge Inoperative (Models With CHT Sensor Only)

Check cooling system or indicator light circuits. If engine is overheating, note that since a PCM DTC was not retrieved, PCM has not attempted to illuminate light. Check and repair cooling system as necessary. If cooling system is operating at normal operating temperature, go to TEST DL: CYLINDER HEAD TEMPERATURE SENSOR , step 40) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

SIL Always On Or Inoperative

Check SIL circuits. Go to TEST KL: SHIFT INDICATOR LIGHT , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Fuel Cap Indicator Light Always On Or Inoperative

Check fuel indicator light circuits. On Crown Victoria, Escape, Explorer Sport, Explorer Sport Trac, Focus, F150 Pickup (except Lightning), Grand Marquis, Ranger, Sable or Taurus, if check fuel indicator light is always ON, go to TEST HX: EVAPORATIVE EMISSION MONITOR & SYSTEM , step 88) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. For check fuel indicator light is always OFF, go to TEST HX: EVAPORATIVE EMISSION MONITOR & SYSTEM , step 89) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. On all other models, see appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.

Check Automatic Transmission Fluid (ATF) level and condition. Check wiring harness connectors. Check for vehicle modifications. Check for electronic add-on items. Check for misadjusted shift linkage.

Check A/T mechanical components and A/T shift solenoids and Torque Converter Clutch (TCC) solenoid operation. See appropriate OVERHAUL or DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

Check wiring harness connectors for loose, damaged or corroded terminals.

Tachometer Inoperative On Models With Clean Tach Output (CTO) Only

Check CTO circuit from PCM terminal No. 48. Go to TEST JH: TACHOMETER OUTPUT FAILURE , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. To determine if CTO circuit is used, see appropriate PIN VOLTAGE/PID VALUE CHARTS article. Check terminal No. 48 under OUTPUTS.

Speedometer/Odometer Inoperative On Models With Manual Shift On-The-Fly (MSOF) Only

Check Transfer Case Speed Sensor (TCSS) circuits. Go to TEST DP: VEHICLE SPEED SENSOR/TRANSFER CASE SPEED SENSOR , step 30) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Boost Gauge Indicates higher than normal Boost

Check supercharger bypass control intercooler system. For supercharger bypass control, go to TEST KJ: SUPERCHARGER BY-PASS CONTROL , step 1) . For intercooler system, go to TEST KP: CHARGE AIR COOLER PUMP , step 7) .

Check instrumentation. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.

Check for external engine oil leaks. Check for correct oil dipstick. Check for proper oil viscosity.

Check the following

  1. Check PCV system. For Aviator and Mustang 4.6L, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. For all others, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 4) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check engine mechanical condition. Check valves, valve guides, valve stem oil seals, intake manifold gaskets, cylinder head oil drain passages and piston rings. See appropriate article in ENGINES.

Perform the following checks

  1. Engine coolant level.
  2. Cooling fan wiring harness connections.
  3. Coolant leaks.
  4. Water/anti-freeze mixture.
  5. Radiator condition.
  6. Collapsed/restricted radiator hoses.
  7. Radiator pressure cap.
  8. Overflow system.

Check the following

  1. On Mustang and ZX2, if cooling fan(s) do not operate at any speed, go to «TEST X: CONSTANT CONTROL RELAY MODULE»(ref-152182-S04220364592003012000000) , step 40) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. On Crown Victoria, Grand Marquis, LS, Thunderbird and Town Car, if hydraulic cooling fan(s) do not operate at any speed, go to step «TEST KN: VARIABLE SPEED ELECTRIC COOLING FAN»(ref-152182-S13643098272003021200000) , step 15) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  3. On Expedition, Navigator and Pickups with Visctronic cooling fan clutch, if cooling fan does not operate, go to «TEST KG: VISCTRONIC DRIVE FAN CLUTCH»(ref-152182-S29016223772003012000000) , step 4) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  4. On all others, if cooling fan(s) do not operate at all speeds, go to «TEST KF: FAN CONTROL RELAY»(ref-152182-S12298051322003012000000) , step 25) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

If directed back here from another article for further cooling fan diagnosis, check engine cooling system for mechanical faults. See COOLING SYSTEM TROUBLE SHOOTING under ENGINE MECHANICAL in TROUBLE SHOOTING - BASIC PROCEDURES article in GENERAL INFORMATION.

ELECTRIC, HYDRAULIC OR VISCTRONIC COOLING FAN(S) ALWAYS ON

Note. This is intended to diagnose an electric, hydraulic or Visctronic cooling fan that is always on with a "cool" engine, and A/C and defroster off.

Ensure all accessories, A/C and defroster are off, and engine is cooled (so cooling fan would not normally come on). Start engine. Check electric or hydraulic cooling fan. If cooling fan runs continuously, check cooling fan ACPSW or ACP circuits. Perform the following

  1. On ZX2 and Mustang 4.6L, go to «TEST X: CONSTANT CONTROL RELAY MODULE»(ref-152182-S04220364592003012000000) , step 80) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. On Mustang 3.8L, go to «TEST X: CONSTANT CONTROL RELAY MODULE»(ref-152182-S04220364592003012000000) , step 82) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  3. On Windstar, go to «TEST KF: FAN CONTROL RELAY»(ref-152182-S12298051322003012000000) , step 63) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  4. On Crown Victoria, Grand Marquis, LS, Thunderbird and Town Car, verify results of quick test. See «QUICK TEST»(ref-152182-S34455276122003012000000) in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Visually inspect cooling fan for concerns.
  5. On Pickups with Visctronic cooling fan clutch, go to «TEST KG: VISCTRONIC DRIVE FAN CLUTCH»(ref-152182-S29016223772003012000000) , step 10) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  6. On all other models, go to «TEST KF: FAN CONTROL RELAY»(ref-152182-S12298051322003012000000) , step 60) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

If directed back here from another article for further cooling fan diagnosis, check engine cooling system for mechanical faults. Check engine cooling system for mechanical faults. See COOLING SYSTEM TROUBLE SHOOTING under ENGINE MECHANICAL in TROUBLE SHOOTING - BASIC PROCEDURES article in GENERAL INFORMATION.

EXHAUST SMOKE

Note. Black smoke may indicate a rich fuel mixture, blue smoke may indicate engine burning oil, and white smoke may indicate water in combustion chamber.

Black Smoke (Rich Mixture)

Check the following

  1. Check fuel delivery system. Go to «TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM»(ref-152182-S07605800792003012000000) , step 1) (Natural Gas models), or go to «TEST HC: GASOLINE FUEL DELIVERY SYSTEM»(ref-152182-S37644316462003012000000) , step 1) (all others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check secondary ignition system. Go to «TEST JB: SECONDARY IGNITION»(ref-152182-S24361161942003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Blue Smoke (Burning Oil)

Check the following

  1. Check PCV system. For Aviator and Mustang 4.6L, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. For all others, go to «TEST HG: PCV SYSTEM»(ref-152182-S17444021872003012000000) , step 4) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
  2. Check engine mechanical condition. Check valve guides, valve stems, valve seals, oil drain passages in cylinder heads (Blue smoke on start-up), piston rings and cylinder bores, and repair as necessary. See appropriate article in ENGINES.

White Smoke (Water In Combustion)

Check for cylinder head gasket leaks, intake manifold gasket leaks, cracked engine block or cylinder head(s) and repair as necessary. See appropriate article in ENGINES.

Check fuel tank(s), hoses, connectors and lines for leaks.

CLIMATE CONTROL (LACK OF A/C COOLING, A/C ALWAYS ON OR A/C INOPERATIVE)

Note. For additional A/C system information, see appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

Lack Of A/C Cooling Or A/C Inoperative (Mustang)

Go to TEST X: CONSTANT CONTROL RELAY MODULE , step 98) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

A/C Always On (Mustang)

Go to TEST X: CONSTANT CONTROL RELAY MODULE , step 140) under SYSTEM TESTS in SELF DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

A/C Does Not Turn Off During WOT (Mustang)

Go to TEST X: CONSTANT CONTROL RELAY MODULE , step 130) under SYSTEM TESTS in SELF DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

A/C System Concerns (All Others)

Check A/C system. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING for diagnosis and repair.

WACF PID Displays YES

If directed here from a MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article with Parameter Identification (PID) WACF displaying YES (fault present), perform diagnostics for KOEO DTC P1460. For Mustang and ZX2, see TEST X: CONSTANT CONTROL RELAY MODULE , step 105) , for all others, see TEST KM: A/C CLUTCH RELAY & A/C CIRCUITS , step 1) in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

EXHAUST ODOR (SULFUR SMELL)

Note. On vehicles with a NEW catalytic converter or vehicles with 5000-10,000 miles, sulfur smell may be normal due to the highly active state of catalytic converter. Replacing catalytic converter on these vehicles may worsen symptom.

Ensure odor is from exhaust and not from an under hood odor, such as battery acid. Ensure that there are no other driveability or exhaust smoke symptoms. See appropriate symptom under SYMPTOM DIAGNOSIS under SYMPTOMS.

CARS

  1. On Crown Victoria, see «ENGINE PERFORMANCE»(ref-154364-S30294725172003051400000) in SYSTEM WIRING DIAGRAMS article.
  2. On Focus, see «ENGINE PERFORMANCE»(ref-154425-S07468081362003051400000) in SYSTEM WIRING DIAGRAMS article.
  3. On Grand Marquis, see «ENGINE PERFORMANCE»(ref-154406-S03975765212003051400000) in SYSTEM WIRING DIAGRAMS article.
  4. On LS, see «ENGINE PERFORMANCE»(ref-154424-S20020034772003051400000) in SYSTEM WIRING DIAGRAMS article.
  5. On Marauder, see «ENGINE PERFORMANCE»(ref-154433-S13321705662003051400000) in SYSTEM WIRING DIAGRAMS article.
  6. On Mustang, see «ENGINE PERFORMANCE»(ref-154340-S15212209392003051400000) in SYSTEM WIRING DIAGRAMS article.
  7. On Sable, see «ENGINE PERFORMANCE»(ref-154408-S21196731022003051400000) in SYSTEM WIRING DIAGRAMS article.
  8. On Taurus, see «ENGINE PERFORMANCE»(ref-154346-S41000750532003051400000) in SYSTEM WIRING DIAGRAMS article.
  9. On Thunderbird, see «ENGINE PERFORMANCE»(ref-154347-S15764185652003051400000) in SYSTEM WIRING DIAGRAMS article.
  10. On Town Car, see «ENGINE PERFORMANCE»(ref-154332-S36162759332003051400000) in SYSTEM WIRING DIAGRAMS article.
  11. On ZX2, see «ENGINE PERFORMANCE»(ref-154434-S05219728512003051400000) in SYSTEM WIRING DIAGRAMS article.

TRUCKS

  1. On Aviator, see «ENGINE PERFORMANCE»(ref-154449-S30952553792003051400000) in SYSTEM WIRING DIAGRAMS article.
  2. On Cab and Chassis F350 Super Duty, see «ENGINE PERFORMANCE»(ref-154363-S18748364512003051400000) in SYSTEM WIRING DIAGRAMS article.
  3. On Cutaway E350 Super Duty, see «ENGINE PERFORMANCE»(ref-154333-S04450249282003051400000) in SYSTEM WIRING DIAGRAMS article.
  4. On Econoline E150, see «ENGINE PERFORMANCE»(ref-154334-S10462385272003051400000) in SYSTEM WIRING DIAGRAMS article.
  5. On Econoline E250, see «ENGINE PERFORMANCE»(ref-154335-S16491182962003051400000) in SYSTEM WIRING DIAGRAMS article.
  6. On Econoline E350 Super Duty, see «ENGINE PERFORMANCE»(ref-154336-S11415451512003051400000) in SYSTEM WIRING DIAGRAMS article.
  7. On Escape, see «ENGINE PERFORMANCE»(ref-154430-S08155773812003051400000) in SYSTEM WIRING DIAGRAMS article.
  8. On Expedition, see «ENGINE PERFORMANCE»(ref-154337-S37422994292003051400000) in SYSTEM WIRING DIAGRAMS article.
  9. On Explorer, see «ENGINE PERFORMANCE»(ref-154339-S21010081492003051400000) in SYSTEM WIRING DIAGRAMS article.
  10. On Explorer Sport, see «ENGINE PERFORMANCE»(ref-154432-S32262993312003051400000) in SYSTEM WIRING DIAGRAMS article.
  11. On Explorer Sport Trac, see «ENGINE PERFORMANCE»(ref-154429-S34302365642003051400000) in SYSTEM WIRING DIAGRAMS article.
  12. On Excursion, see «ENGINE PERFORMANCE»(ref-154426-S21967319832003051400000) in SYSTEM WIRING DIAGRAMS article.
  13. On E450 Super Duty, see «ENGINE PERFORMANCE»(ref-154453-S37520167922003051400000) in SYSTEM WIRING DIAGRAMS article.
  14. On E550 Super Duty, see «ENGINE PERFORMANCE»(ref-154456-S36775797642003051400000) in SYSTEM WIRING DIAGRAMS article.
  15. On F450 Super Duty, see «ENGINE PERFORMANCE»(ref-154454-S19299036622003051400000) in SYSTEM WIRING DIAGRAMS article.
  16. On F550 Super Duty, see «ENGINE PERFORMANCE»(ref-154455-S23398037162003051400000) in SYSTEM WIRING DIAGRAMS article.
  17. On Mountaineer, see «ENGINE PERFORMANCE»(ref-154407-S09318122352003051400000) in SYSTEM WIRING DIAGRAMS article.
  18. On Navigator, see «ENGINE PERFORMANCE»(ref-154331-S09556899652003051400000) in SYSTEM WIRING DIAGRAMS article.
  19. On Pickup F150, see «ENGINE PERFORMANCE»(ref-154341-S02719138532003051400000) in SYSTEM WIRING DIAGRAMS article.
  20. On Pickup F250 Super Duty, see «ENGINE PERFORMANCE»(ref-154342-S17416650412003051400000) in SYSTEM WIRING DIAGRAMS article.
  21. On Pickup F350 Super Duty, see «ENGINE PERFORMANCE»(ref-154343-S34121943772003051400000) in SYSTEM WIRING DIAGRAMS article.
  22. On Ranger, see «ENGINE PERFORMANCE»(ref-154344-S07083847482003051400000) in SYSTEM WIRING DIAGRAMS article.
  23. On RV Cutaway E350 Super Duty, see «ENGINE PERFORMANCE»(ref-154345-S25603007422003051400000) in SYSTEM WIRING DIAGRAMS article.
  24. On Windstar, see «ENGINE PERFORMANCE»(ref-154348-S23364496442003051400000) in SYSTEM WIRING DIAGRAMS article.

More articles — Engine Controls - Trouble Shooting - No Codes - Cng, Flex-Fuel & Gasoline