QT2 THE ENGINE RUNS ROUGH AT IDLE WITH KOER OR CONTINUOUS MEMORY DTCs: CHECK THE INJECTOR FAULT (INJxF) PID(s)
Note. An injector circuit fault could result in unrelated DTCs being received from the PCM.
- KOEO.
- Access the INJxF PIDs (the "x" indicates the injector number). There will be one INJxF PID for each engine cylinder.
Do any of the INJxF PIDs indicate a fault (or Yes)?
| Yes | No |
|---|
| An injector circuit fault exists. KEY OFF. Disregard the DTCs. | No fault detected by injector fault PIDs. KEY OFF. GO to Quick Test QT1 and follow the YES Action to Take for all others. |
| Ford GT: GO to L: Dual-Injection Fuel Delivery System STEP HL3. |
| All others: GO to H: Fuel Control STEP H34. |
CHART 1
- Starting Concerns: Stall After Start
- Stalls/Quits: Idle, Acceleration, Cruise
- Runs Rough
- Misses
- Buck/Jerk
- Hesitation/Stumble
- Surge
- Unique Idle concerns: Rolling Idle
Note. For stalls on passenger car applications, the engine may stall if left running while refueling. Advise the customer to turn the engine off while refueling to avoid contamination or damage to the EVAP system.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Check the following PIDs: DPFEGR (if equipped) (hot idle value within 0.15 volt of KOEO value) LONGFT1/LONGFT2 (value between -20 and +20%) VPWR (value between 10.5 and 17.0 volts, and within 0.5 volt of battery voltage) | DPFEGR PID value not within 0.15 volt of KOEO value: For vehicles equipped with ESM EGR: GO to H: Exhaust Gas Recirculation System Module (ESM) STEP HH27. All others: GO to E: Exhaust Gas Recirculation (EGR) Systems STEP HE57. |
| LONGFT1/LONGFT2 value low (-): Continue diagnosis. Concentrate checks in areas that would cause the engine to run rich. |
| LONGFT1/LONGFT2 value high (+): Continue diagnosis. Concentrate checks in areas that would cause the engine to run lean. |
| VPWR not between 10.5 and 17.0 volts: REFER to CHARGING SYSTEM - GENERAL INFORMATION . |
| VPWR between 10.5 and 17.0 volts, but not within 0.5 volt of battery voltage: CHECK B+ supply to PCM power relay. CHECK VPWR circuit between PCM and PCM power relay. CHECK PWR GND circuits. |
| For vehicles that run rough at idle: With the KOEO, check the INJxF PIDs (the "x" indicates the injector number; there will be one INJxF PID for each engine cylinder). All INJxF PIDs must indicate no fault (or NO). | INJxF PID(s) indicate a fault (an injector circuit fault is indicated) |
| Ford GT: GO to L: Dual-Injection Fuel Delivery System STEP HL3. |
| All others: GO to H: Fuel Control STEP H34. |
| Mass Air Flow (MAF) Sensor | GO to C: Mass Air Flow (MAF) Sensor STEP DC26. |
| Secondary Ignition System | For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . For all others, GO to PINPOINT TEST JB . |
| Fuel Delivery System | GO to PINPOINT TEST HC . |
| Exhaust System | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF8. |
| PCV System | GO to PINPOINT TEST HG . |
| EVAP System | GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX14 |
| Automatic Transmission | REFER to AUTOMATIC TRANSMISSION/TRANSAXLE . |
| Base Engine | REFER to ENGINE . |
| Applications without electronic throttle control: Intake Air System | GO to PINPOINT TEST HU . |
| Applications with A/C pressure sensor (3-wire sensor): A/C pressure (ACP) sensor input to PCM | GO to S: Air Conditioning Pressure (ACP) Sensor STEP DS18. |
| Additional Testing | GO to PINPOINT TEST Z . |
| Additional Checks | REFER to the applicable service information article. |
| NOTE: Some applications have a PID that indicates whether the PCM is reducing torque (TQ_CNTL) (#095E b0), and if so, why the torque is being reduced (#095Eb1- 13) (0 equals No torque reduction requested; 1 equals Torque Truncation. Cuts fuel to protect when line pressure falls to minimum limit; 2 equals Traction Control Event. Cuts fuel/spark for traction control; 3 equals Vehicle Speed Limit. Cuts fuel). |
| Correct the PCM vehicle identification (VID) block information (refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) Be aware of engine RPM/speed limiting functions of the PCM (look for incorrect high vehicle speed signal from ABS, VSS, or OSS). Verify the fuel cap is properly tightened and not physically damaged. Drivelines Manual transmission/clutch Charging system Traction control system (if equipped) A/C system (for surge with A/C on) Speed control system (for surge with speed control on) A/C compressor diode, if equipped (for rolling idle) |
| NOTE |
|---|
| Some applications have a PID that indicates whether the PCM is reducing torque (TQ_CNTL) (#095E b0), and if so, why the torque is being reduced (#095Eb1- 13) (0 equals No torque reduction requested; 1 equals Torque Truncation. Cuts fuel to protect when line pressure falls to minimum limit; 2 equals Traction Control Event. Cuts fuel/spark for traction control; 3 equals Vehicle Speed Limit. Cuts fuel). |
CHART 2
- Starting Concerns: Hard Start/Long Crank/Erratic Start/Erratic Crank
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Battery Condition and Current Draw | Visual. REFER to CHARGING SYSTEM - GENERAL INFORMATION . |
| Secondary Ignition System | For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . For all others, GO to PINPOINT TEST JB . |
| Fuel Delivery System | GO to PINPOINT TEST HC . |
| Exhaust System | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF8. |
| PCV System | GO to PINPOINT TEST HG . |
| EVAP System | GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX14. |
| Applications without electronic throttle control: Intake Air System | GO to PINPOINT TEST HU . |
| Starting System | REFER to STARTING SYSTEM . |
| Mass Air Flow (MAF) Sensor | GO to C: Mass Air Flow (MAF) Sensor STEP DC26. |
| Additional Testing | GO to PINPOINT TEST Z . |
| Additional Checks: For applications with two camshaft position (CMP) sensors, verify the CMP1 and CMP2 circuits are not shorted together. | Visual |
CHART 3
- Starting Concerns: No Start (Engine Cranks)
Note. Extended cranking because of a no start can load the exhaust system with raw fuel, damaging the catalytic converter after the engine starts. For applications with secondary air injection (AIR) systems, carry out the following after the no start has been repaired: Disconnect the electric AIR pump relay, run the engine until the surplus fuel is used up, and reconnect the relay (disconnecting the relay may set a continuous memory PCM DTC that needs to be cleared).
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Add-on Anti-Theft Devices | Visual. CHECK with the customer. |
| Fuel/Ignition | LS and Thunderbird: GO to B: Fuel Pump Driver Module STEP KB53. |
| All others: GO to PINPOINT TEST A . |
| Applications without electronic throttle control - If the engine will start at part throttle: If the engine will not start at closed throttle, but will start and run normally at part throttle, check the idle air control (IAC) system. | The engine will now start and run normally at part throttle: GO to PINPOINT TEST KE . |
| Exhaust System (restrictions) | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF8. |
| Base Engine | REFER to ENGINE . |
| Additional Testing | GO to PINPOINT TEST Z . |
CHART 4
- Unique Idle Concerns: Slow Return To Idle
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Vacuum Leaks, Throttle Body | Visual. |
| PCV System | GO to PINPOINT TEST HG . |
| Applications without electronic throttle control: Intake Air System (air leaks) | GO to PINPOINT TEST HU . |
CHART 5
- Unique Idle Concerns: Fast Idle
- Diesels/Runs On
Note. If the vehicle runs normally after the ignition key is turned OFF, check for a damaged ignition switch, an IGN RUN circuit short to power, a VPWR circuit short to power, etc. Refer to the appropriate service information article or SYSTEM WIRING DIAGRAMS .
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Base engine air leaks, including proper sealing of intake manifold and components/vacuum lines attached to intake air (such as the PCV, EGR or IAC valve/vacuum lines). | REFER to ENGINE . |
| Verify the engine operates at normal temperature. | Visual. REFER to ENGINE COOLING or the Symptom Index, to diagnose any cooling system concerns that are present. |
| Fast idle concerns: (applications without electronic throttle control) KOEO, monitor the TP MODE PID while wiggling the TP sensor circuits. The TP MODE PID can also be monitored during vehicle drive. With the throttle closed, the TP MODE PID must be C/T (closed throttle). | TP Mode PID is not C/T with the throttle closed: NOTE: At vehicle start, the TPREL begins at about 1.25 volts, and counts down to the lowest TP V value seen since engine start. If the TP V value goes below the "normal" range, then increases again, TPREL sets to the lower voltage. If TP V is about 0.04 volts greater than the TPREL value at closed throttle, the PCM goes into part throttle mode. Monitor the TP V and TPREL PIDs for sudden changes while checking for intermittent TP circuit/connector concerns. Also check for loose/worn throttle plates. If no concern is found, GO to PINPOINT TEST Z . |
| Applications without electronic throttle control: Intake Air System (air leaks) | GO to PINPOINT TEST HU . |
| Additional Testing | GO to PINPOINT TEST Z . |
| NOTE |
|---|
| At vehicle start, the TPREL begins at about 1.25 volts, and counts down to the lowest TP V value seen since engine start. If the TP V value goes below the "normal" range, then increases again, TPREL sets to the lower voltage. If TP V is about 0.04 volts greater than the TPREL value at closed throttle, the PCM goes into part throttle mode. |
CHART 6
- Unique Idle Concerns: Low/Slow Idle
- Stalls/Quits: Deceleration
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Verify the fuel filler cap is properly tightened. | Visual |
| For A/T with stalls/quits on deceleration: Transmission | REFER to AUTOMATIC TRANSMISSION/TRANSAXLE (Diagnosis by Symptom: Torque Convertor Operation Concerns). |
| Fuel Delivery System | GO to PINPOINT TEST HC . |
| Applications without electronic throttle control: Intake Air System | GO to PINPOINT TEST HU . |
| Base Engine | REFER to ENGINE . |
| Additional Testing | GO to PINPOINT TEST Z . |
CHART 7
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Secondary Ignition | For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . For all others, GO to PINPOINT TEST JB . |
| Fuel Delivery System | GO to PINPOINT TEST HC . |
| Base Engine | REFER to ENGINE . |
| Exhaust System | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF8. |
| Additional Testing | GO to PINPOINT TEST Z . |
CHART 8
Note. Verify the symptom is reported under normal driving conditions without excessive engine/vehicle load. Also, be aware of the engine RPM/speed limiting functions of the PCM.
Note. For applications with a knock sensor (KS), a lack of power may result when the vehicle is operated with a breakout box installed at the PCM. The KS circuits are not shielded in the breakout box, and KS signal noise may be noticed by the PCM. If this happens, spark timing will be retarded and a lack of power may result.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Automatic Transmission Fluid Throttle Linkage Air cleaner element | Visual |
| Check the following PIDS: DPFEGR (if equipped) (hot idle value within 0.15 volt of KOEO value) LONGFT1/LONGFT2 (value between -20 and +20%) For vehicles equipped with IMTV: IMTVF for both KOEO and KOER, with the transmission in PARK/NEUTRAL and the engine RPM greater than 3,000 RPM, the PID should indicate no fault (or NO) in both situations. | DPFEGR PID value not within 0.15 volt of KOEO value: For vehicles equipped with ESM EGR: GO to H: Exhaust Gas Recirculation System Module (ESM) STEP HH27. All others: GO to E: Exhaust Gas Recirculation (EGR) Systems STEP HE57. |
| LONGFT1/LONGFT2 value low (-): Continue diagnosis. Concentrate checks in areas that would cause the engine to run rich. |
| LONGFT1/LONGFT2 value high (+): Continue diagnosis. Concentrate checks in areas that would cause the engine to run lean. IMTVF PID indicates a fault: GO to U: Intake Air Systems STEP HU41. |
| Fuel Delivery System | GO to PINPOINT TEST HC . |
| Secondary Ignition | For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . For all others, GO to PINPOINT TEST JB . |
| Mass Air Flow (MAF) Sensor | GO to C: Mass Air Flow (MAF) Sensor STEP DC26. |
| Exhaust System | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF8. |
| Base Engine | REFER to ENGINE . |
| Automatic Transmission | REFER to AUTOMATIC TRANSMISSION/TRANSAXLE . |
| Brake System (brake drag or binding) | REFER to BRAKE SYSTEM - GENERAL INFORMATION . |
| Supercharged applications: Supercharger Bypass System | GO to J: Supercharger Bypass Control STEP KJ11. |
| Additional Testing | GO to PINPOINT TEST Z . |
| Additional Checks: NOTE: Some applications have a PID that indicates whether the PCM is reducing torque (TQ_CNTL) (#095E b0), and if so, why the torque is being reduced (#095Eb1-13) (0 equals No torque reduction requested; 1 equals Torque Truncation. Cuts fuel to protect when the line pressure falls to a minimum limit; 2 equals Traction Control Event. Cuts fuel/spark for traction control; 3 equals Vehicle Speed Limit. Cuts fuel). Customer driving habits Correct PCM vehicle identification (VID) block information. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . IMRC linkage (if equipped) Clutch (M/T) Charging system Engine RPM/speed limiting functions of the PCM (look for incorrect high vehicle speed signal from ABS, VSS, or OSS) | Visual. REFER to the applicable service information article. |
| NOTE |
|---|
| Some applications have a PID that indicates whether the PCM is reducing torque (TQ_CNTL) (#095E b0), and if so, why the torque is being reduced (#095Eb1-13) (0 equals No torque reduction requested; 1 equals Torque Truncation. |
CHART 9
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Verify the engine operates at normal temperature | Visual. REFER to ENGINE COOLING or the Symptom Index, to diagnose any cooling system concerns that are present. |
| Verify correct coolant level and coolant concentration | REFER to ENGINE COOLING for proper coolant concentrations and fill procedures. |
| Mass Air Flow (MAF) Sensor | GO to C: Mass Air Flow (MAF) Sensor STEP DC26. |
| Base Engine | REFER to ENGINE . |
| Fuel Delivery System | GO to PINPOINT TEST HC . |
| Secondary Ignition System | For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . For all others, GO to PINPOINT TEST JB . |
| PCV System | GO to PINPOINT TEST HG . |
| Engine Oil Quality | Visual |
| Additional Testing | GO to PINPOINT TEST Z . |
CHART 10
Note. Since driving styles can have a significant influence on fuel economy, verify the concern before starting an in-depth diagnosis. Also, the following external factors could contribute to poor fuel economy conditions
- Stop and go driving
- Improper tire pressure and size
- Vehicle loads (such as trailer towing)
- Extended winter warm-up conditions
- High speed driving
- Improper axle ratio
- Road/weather conditions
- Aftermarket add-ons
- Short run operations
- Customer expectations
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Transmission Fluid Level | Visual |
| Check the following PIDs: DPFEGR (if equipped) (hot idle value within 0.15 volt of KOEO value) LONGFT1/LONGFT2 (value between - 20 and +20%) VPWR (value between 10.5 and 17.0 volts, and within 0.5 volt of battery voltage) | DPFEGR PID value not within 0.15 volt of KOEO value: For vehicles equipped with ESM EGR: GO to H: Exhaust Gas Recirculation System Module (ESM) STEP HH27. All others: GO to E: Exhaust Gas Recirculation (EGR) Systems STEP HE57. |
| LONGFT1/LONGFT2 value low (-): Continue diagnosis. Concentrate checks in areas that would cause the engine to run rich. |
| LONGFT1/LONGFT2 value high (+): Continue diagnosis. Concentrate checks in areas that would cause the engine to run lean. |
| VPWR not between 10.5 and 17.0 volts: REFER to CHARGING SYSTEM - GENERAL INFORMATION . |
| VPWR between 10.5 and 17.0 volts, but not within 0.5 volt of battery voltage: CHECK the B+ supply to the PCM power relay. CHECK the VPWR circuit between the PCM and the PCM power relay. CHECK PWR GND circuits. |
| Verify the engine operates at normal temperature. | Visual. REFER to ENGINE COOLING or the Symptom Index, to diagnose any cooling system concerns that are present. |
| Secondary Ignition System | For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . For all others, GO to PINPOINT TEST JB . |
| Fuel System | GO to PINPOINT TEST HC . |
| Exhaust System | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF8. |
| Automatic Transmission | REFER to AUTOMATIC TRANSMISSION/TRANSAXLE . |
| PCV System | GO to PINPOINT TEST HG . |
| Additional Checks: Correct PCM vehicle identification (VID) block information. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . Brake drag Base engine concerns Incorrect PCV valve Contaminated MAF sensor Intake air system | REFER to the applicable service information article. |
| Additional Testing | GO to PINPOINT TEST Z . |
CHART 11
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Emissions Related Systems | GO to PINPOINT TEST EM . |
CHART 12
- Warning Indicators: PTO, MIL, TCIL, Temperature Warning Indicator Lamp or Gauge (applications with CHT sensor only), Check Fuel Cap Indicator Lamp, ETC Indicator Lamp
- PTO not working correctly
Note. If the symptom is both a MIL on and exhaust emission test failure, GO directly to CHART 11 . If the engine is a no start, GO directly to CHART 3 . If the engine runs rough at idle, GO directly to CHART 1 .
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Verify the fuel filler cap is properly tightened. | Visual |
| Trucks with power take off (PTO) and MIL concern: PTO input to the PCM | E-Series and F-Series: GO to PINPOINT TEST FB . |
| PTO Indicator never on, always on: PTO circuits | E-Series and F-Series: GO to B: Power Take Off (PTO) STEP FB6 |
| PTO not working correctly: PTO operation | E-Series and F-Series: GO to PINPOINT TEST FB . |
| MIL always on when the engine is running (no DTCs): MIL circuits | Crown Victoria/Grand Marquis, Explorer Sport Trac, and Ranger: GO to PINPOINT TEST NB . |
| All others: REFER to INSTRUMENT CLUSTER . |
| TCIL always on when the engine is running (no DTCs): TCIL circuits | Crown Victoria/Grand Marquis, Excursion, Explorer Sport Trac, E-Series, and Ranger: GO to B: Transmission Control Switch (TCS)/ Transmission Control Indicator Lamp (TCIL) STEP TB7. |
| All others: REFER to INSTRUMENT CLUSTER . |
| MIL never on: (including the bulb check when the engine is first started): MIL circuits | Crown Victoria/Grand Marquis, Explorer Sport Trac, and Ranger: GO to B: Malfunction Indicator Lamp STEP NB3. |
| All others: REFER to INSTRUMENT CLUSTER . |
| TCIL never on: TCIL circuits | Crown Victoria/Grand Marquis, Excursion, Explorer Sport Trac, and Ranger: GO to B: Transmission Control Switch (TCS)/ Transmission Control Indicator Lamp (TCIL) STEP TB9. |
| All others: REFER to INSTRUMENT CLUSTER . |
| Temperature warning indicator lamp or gauge concerns (applications with CHT sensor only): Engine cooling system or lamp circuits | If engine is overheating: REFER to ENGINE COOLING . Be aware that since a PCM DTC was not received, the PCM has not attempted to turn the lamp on. |
| If engine operates at normal temperature: GO to L: Cylinder Head Temperature (CHT) Sensor STEP DL28. |
| Check fuel cap indicator lamp always on or off: Check the fuel indicator lamp circuits | Crown Victoria/Grand Marquis, Explorer Sport Trac, and Ranger: Indicator Lamp Always On, GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX44. Indicator Lamp Always Off, GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX45. |
| All others: REFER to INSTRUMENT CLUSTER . |
| ETC indicator lamp never/always on: ETC indicator lamp circuits | REFER to INSTRUMENT CLUSTER . |
| Additional Testing | GO to PINPOINT TEST Z . |
CHART 13
- Automatic Transmission (A/T) Shift Concerns: Upshift, Downshift, Engagement
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Transmission | REFER to AUTOMATIC TRANSMISSION/TRANSAXLE . |
| Additional Tests | GO to PINPOINT TEST Z . |
CHART 14
- Instrumentation: Tachometer Inoperative, Speedometer/Odometer Inoperative, Boost Gauge indicates higher than normal boost (supercharger applications), Fuel Gauge Inoperative
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Tachometer inoperative: Applications with CTO circuit from the PCM | GO to PINPOINT TEST JH . |
| Speedometer/odometer inoperative | Applications with manual shift-on-the-fly (MSOF) transfer case using a transfer case speed sensor (TCSS): GO to P: Vehicle Speed Sensor (VSS)/Transfer Case Speed Sensor (TCSS) STEP DP16. |
| Applications with manual transmissions using a vehicle speed sensor (VSS): GO to PINPOINT TEST DP . |
| Applications with manual transmissions using an output shaft speed (OSS) sensor: GO to PINPOINT TEST TJ . |
| Boost gauge indicates higher than normal boost: Supercharger bypass control Intercooler system | Supercharger bypass control: GO to PINPOINT TEST KJ . |
| Intercooler system: GO to P: Charge Air Cooler (CAC) Pump STEP KP8. |
| Fuel gauge inoperative: Fuel gauge always indicates full or empty. | For vehicles with hardwired fuel level indicator (FLI) circuit input to PCM (Crown Victoria/Grand Marquis, Explorer Sport Trac, Ranger): GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX37. |
| All others: REFER to INSTRUMENT CLUSTER . |
| Instrumentation | REFER to INSTRUMENT CLUSTER . |
CHART 15
- Oil System Concerns: High Oil Consumption, Leaks
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| PCV System | GO to PINPOINT TEST HG . |
| Base Engine | REFER to ENGINE . |
| Additional Checks External leaks Proper dipstick Proper oil viscosity | Visual |
CHART 16
- Cooling System Concerns: Electric Cooling Fan(s) Does Not Operate (Low, Medium, High or Variable speed)
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Electric Cooling Fan Components | Crown Victoria/Grand Marquis, Five Hundred/Freestyle/Montego, LS, Thunderbird, and Town Car: GO to N: Variable Speed Electric Cooling Fan STEP KN9. |
| All others: GO to F: Fan Control (FC) Relays STEP KF56. |
| Cooling System | REFER to ENGINE COOLING . |
CHART 17
- Cooling System Concerns: Electric Cooling Fan(s) Always Runs
Note. This chart is intended to only diagnose an electric cooling fan that always runs with a cool engine and the A/C and defroster off.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Cooling fan circuits and ACPSW or ACP circuits | Crown Victoria/Grand Marquis, Five Hundred/Freestyle/Montego, LS, Thunderbird, and Town Car: VERIFY results of the Quick Test. Visually INSPECT the cooling fan for concerns. |
| Mustang 4.0L, Freestar/Monterey and Aviator: GO to F: Fan Control (FC) Relays STEP KF56. |
| All others: GO to F: Fan Control (FC) Relays STEP KF55. |
| Cooling System | REFER to ENGINE COOLING . |
Chart 18
- Exhaust System Concerns: Visible Smoke
Note. Black smoke indicates a rich fuel mixture, blue smoke indicates burning oil, and white smoke indicates water in the combustion chamber.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Base Engine | REFER to ENGINE . |
| Black smoke: Fuel Delivery System | GO to PINPOINT TEST HC . |
| Black smoke: Ignition System | For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . |
| For all others, GO to PINPOINT TEST JB . |
| Blue smoke: PCV System | REFER to ENGINE SYSTEM - GENERAL INFORMATION for a description of the Oil Consumption Test. |
Chart 19
- Fuel System Concerns: Odor, Engine Compartment
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| EVAP System | Visual. |
| Fuel System | Visual. GO to PINPOINT TEST HC . |
Chart 20
- Engine Noise (under hood)
Note. Attempt to identify the source of the noise. If the noise is from a source other than those listed below, refer to the Symptom Index (for noise such as spark knock) or the applicable service information article.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Snap noise that may be due to secondary ignition arcing: Secondary Ignition System | For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . |
| For all others, CHECK the condition of the spark plug boots. |
Chart 21
- Climate Control: Lack of cooling, A/C not functioning, A/C always on, or A/C compressor runs continuously
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| A/C System | If sent here with WACF PID indicating a fault (or YES): GO to POWERTRAIN DTC CHARTS AND DESCRIPTIONS - GASOLINE MODELS and follow the directions for KOEO DTC P0645. |
| All others: REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION . |
Chart 22
- Exhaust System Concerns: Odor (Sulfur or Rotten Egg Smell)
Note. A slight sulfur smell may be normal. Catalysts with less than 8,000-16,000 kilometers (5,000-10,000 miles), new vehicle or replaced catalyst, are likely to have a sulfur smell due to the highly active state of new catalysts. Replacing the catalyst can actually make the symptom worse.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Check for any driveability or exhaust smoke symptoms. | REFER to STEP 2: NO DTC(S) PRESENT SYMPTOM CHART INDEX for direction to repair other symptoms. |
| Fuel Delivery System | GO to PINPOINT TEST HC . |
| Fuel Source | Talk with the customer. Since sulfur content can vary in different fuels, suggest trying a different fuel source. |
Chart 23
- Starting Concerns: No Crank
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted) |
|---|
| Add-on Anti-Theft Devices | Visual. CHECK with the customer. |
| Anti-Theft | REFER to ANTI-THEFT . |
| Base Engine (Starting System) | REFER to ENGINE . |
