Chart 1
- Starting Concerns: Stalls 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, engine may stall if left running while refueling. Advise customer to turn engine off while refueling to avoid contamination or damage to the EVAP system.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Check The Following PIDs: DPFEGR (if equipped) (hot idle value within 0.15V of KOEO value) LONGFT1 / LONGFT2 (value between -20 and +20) VPWR (value between 10.5 and 17.0 volts, and within 0.5 volts of battery voltage) | DPFEGR PID value not within 0.15V of KOEO value: For vehicles equipped with ESM EGR: GO to H: Exhaust Gas Recirculation System Module (ESM) STEP HH34. 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: Go to the appropriate GENERATORS & REGULATORS article. VPWR between 10.5 and 17.0 volts, but not within 0.5 of battery voltage: CHECK B(+) supply to PCM power relay (or CCRM). CHECK VPWR circuit between PCM and PCM power relay or CCRM. CHECK PWR GND circuits. |
| For vehicles that run rough at idle: With the key on, engine off, 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): Natural Gas applications: GO to A: Natural Gas Fuel Control STEP HA27. All others: GO to H: Fuel Control STEP H46. |
| Mass Air Flow (MAF) Sensor | GO to C: Mass Air Flow Sensor STEP DC25. |
| 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 | Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1. |
| Exhaust System | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF5. |
| PCV System | GO to G: Positive Crankcase Ventilation (PCV) System STEP HG1. |
| Natural Gas applications with rough idle: Injector circuits between NG module and injectors. | GO to A: Natural Gas Fuel Control STEP HA27. |
| EVAP System | GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX14. |
| Automatic Transmission | Automatic Transaxle/Transmission - Refer to the appropriate AUTOMATIC TRANSMISSION article. |
| Base Engine | Engine System - Refer to the appropriate ENGINE article. |
| Intake Air System | GO to U: Intake Air Systems STEP HU1. |
| 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 Z: Intermittent STEP Z1. |
| 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). Correct PCM vehicle identification (VID) block information (refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY - FLASH 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 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) | Appropriate service information article. |
| 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). |
Chart 2
Starting Concerns
- Hard Start/Long Crank
- Erratic Start/Erratic Crank
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Battery Condition and Current Draw | Visual, Charging System - Refer to the appropriate GENERATORS & REGULATORS article. |
| 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 | Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1. |
| Exhaust System | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF5. |
| PCV System | GO to G: Positive Crankcase Ventilation (PCV) System STEP HG1. |
| EVAP System | GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX14. |
| Intake Air System | GO to U: Intake Air Systems STEP HU1. |
| Starting System | Starting System - Refer to the appropriate STARTERS article. |
| Mass Air Flow (MAF) Sensor | GO to C: Mass Air Flow Sensor STEP DC25. |
| 5.4L SC F -Series only: Check high speed fuel pump secondary circuits. | GO to A: Fuel Pump Relay STEP KA52. |
| Additional Testing | GO to Z: Intermittent STEP Z1. |
| Additional Checks: For applications with two Camshaft Position (CMP) sensors, verify 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, perform the following after the no start has been repaired: Disconnect the electric secondary air injection (AIR) solid state 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 will need to be cleared).
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Add-on Anti-Theft Devices | Visual, check with customer. |
| Fuel/Ignition | Thunderbird and LS6/LS8: GO to B: Fuel Pump Driver Module STEP KB56. All others: GO to A: No Start STEP A1. |
| If engine will not start now: If engine will not start at closed throttle, but will start and run normally at part throttle, check Idle Air Control (IAC) System. | Engine will now start and run normally at part throttle: GO to E: Idle Air Control (IAC) Valve STEP KE2. |
| Exhaust System (restrictions) | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF5. |
| Base Engine | Engine System - Refer to the appropriate ENGINE article. |
| Additional Testing | GO to Z: Intermittent STEP Z1. |
Chart 4
Unique Idle Concerns
- Slow Return To Idle
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Vacuum Leaks, Throttle Body | Visual |
| PCV System | GO to G: Positive Crankcase Ventilation (PCV) System STEP HG1. |
| Intake Air System (air leaks) | GO to U: Intake Air Systems STEP HU1. |
Chart 5
Unique Idle Concerns
- Fast Idle
Additional Driveability Concerns
- Diesels/Runs On
Note. If vehicle runs normally after the ignition key is turned OFF, check for damaged ignition switch, IGN RUN circuit short to power, VPWR circuit short to power, etc. Refer to the appropriate SYSTEM WIRING DIAGRAMS article.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) 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). | Visual, Engine System - Refer to the appropriate ENGINE article. |
| Verify engine operates at normal temperature. | Visual (refer to STEP 2: NO DTC(S) PRESENT SYMPTOM CHART INDEX or the appropriate ENGINE COOLING article, to diagnose any cooling system concerns that are present). |
| Fast idle concerns: Key on, engine off, monitor TP MODE PID while wiggling TP sensor circuits. TP MODE PID can also be monitored during vehicle drive. With throttle closed, TP MODE PID must be C/T (closed throttle). | TP Mode PID is not C/T with throttle closed: NOTE: At vehicle start, the TPREL will begin at about 1.25 volts, and count 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 will set to the lower voltage. If TP V is about 0.04 volts greater than the TPREL value at closed throttle, the PCM will go into part throttle mode. Monitor 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 Z: Intermittent STEP Z1. |
| Intake Air System (air leaks) | GO to U: Intake Air Systems STEP HU1. |
| Additional Testing | GO to Z: Intermittent STEP Z1. |
| NOTE |
|---|
| At vehicle start, the TPREL will begin at about 1.25 volts, and count 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 will set to the lower voltage. If TP V is about 0.04 volts greater than the TPREL value at closed throttle, the PCM will go into part throttle mode. |
Chart 6
Unique Idle Concerns
- Low/Slow Idle
Stalls/Quits
- Deceleration
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Verify fuel filler cap is properly tightened | Visual |
| For A/T with Stalls/Quits on deceleration: Transmission | Automatic Transaxle/Transmission - Refer to the appropriate AUTOMATIC TRANSMISSION article (Diagnosis By Symptom: Torque Converter Concerns). |
| For Low idle with A/C on (4.6/5.4L/6.8L E -Series): Check ACCS PID with A/C on and engine running (PID should indicate ON when A/C clutch is engaged). (On applications where the PCM cannot control the A/C clutch on and off, the PCM uses the ACCS circuit to determine additional load on the engine.) | ACCS PID does not indicate ON with A/C clutch engaged: GO to M: Air conditioning clutch relay circuit STEP KM7. |
| Fuel Delivery System | Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1. |
| Intake Air System | GO to U: Intake Air Systems STEP HU1. |
| Base Engine | Engine System - Refer to the appropriate ENGINE article. |
| Additional Checks: Check if the operation of certain systems are causing the low idle. | Visual |
| Additional Testing | GO to Z: Intermittent STEP Z1. |
Chart 7
Backfires
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) 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 | Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1. |
| Base Engine | Engine System - Refer to the appropriate ENGINE article. |
| Exhaust System | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF5. |
| Additional Testing | GO to Z: Intermittent STEP Z1. |
Chart 8
Lack/Loss of Power
Note. Verify 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 knock sensor, 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 - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Automatic Transmission Fluid Throttle Linkage Air cleaner element | Visual |
| Check the Following PIDS: DPFEGR (if equipped) (hot idle value within 0.15V of KOEO value) LONGFT1 / LONGFT2 (value between -20 and +20) For 4.6L E/F Series: IMTVF with both Key On Engine Off, and with transmission in PARK/NEUTRAL and engine rpm greater than 3000 rpm (PID should indicate no fault (or NO) in both situations). | DPFEGR PID value not within 0.15V of KOEO value: For vehicles equipped with ESM EGR: GO to H: Exhaust Gas Recirculation System Module (ESM) STEP HH34. 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 HU42. |
| Fuel Delivery System | Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1. |
| 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 Sensor STEP DC25. |
| Exhaust System | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF5. |
| Base Engine | Engine System - Refer to the appropriate ENGINE article. |
| Automatic Transmission | Automatic Transaxle/Transmission - Refer to the appropriate AUTOMATIC TRANSMISSION article (Diagnosis by Symptom - Poor Performance). |
| Brake System (brake drag or binding) | Refer to the appropriate BRAKE SYSTEM article. |
| Mustang only: Check for lack of A/C cutoff under wide open throttle conditions. | Audible (listen for A/C clutch to disengage during a brief wide open throttle, then re-engage a few seconds after returning to idle). Follow Symptom CHART 21 if A/C does not cutoff. |
| Supercharged applications: Supercharger bypass system | GO to J: Supercharger Bypass Control STEP KJ13. |
| 5.4L SC F -Series: Check high speed fuel pump secondary circuits | GO to A: Fuel Pump Relay STEP KA52. |
| Additional Testing | GO to Z: Intermittent STEP Z1. |
| Additional Checks: NOTE: Some applications have a PID that will indicate whether the PCM is reducing torque (095E b0), and if so, why the torque is being reduced (095E b1-13). Customer driving habits Correct PCM vehicle identification (VID) block information (refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY - FLASH 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. Appropriate service information article. |
| NOTE |
|---|
| Some applications have a PID that will indicate whether the PCM is reducing torque (095E b0), and if so, why the torque is being reduced (095E b1-13). |
Chart 9
Spark Knock
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Verify engine operates at normal temperature | Visual (refer to STEP 2: NO DTC(S) PRESENT SYMPTOM CHART INDEX or the appropriate ENGINE COOLING article, to diagnose any cooling system concerns that are present). |
| Verify correct coolant level and coolant concentration | Refer to the appropriate ENGINE COOLING article for proper fill concentrations and fill procedures. |
| Mass Air Flow (MAF) Sensor | GO to C: Mass Air Flow Sensor STEP DC25. |
| Base Engine | Engine System - Refer to the appropriate ENGINE article. |
| Fuel Delivery System | Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1. |
| 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 G: Positive Crankcase Ventilation (PCV) System STEP HG1. |
| Engine Oil Quality | Visual |
| Additional Testing | GO to Z: Intermittent STEP Z1. |
Chart 10
Poor Fuel Economy
Note. Since driving styles can have a significant influence on fuel economy, verify the concern before starting an indepth diagnosis. Also, the following external factors could contribute to "poor fuel economy" conditions
- Stop/go driving
- Improper tire pressure/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 - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Transmission Fluid Level | Visual |
| Check The Following PIDs: DPFEGR (if equipped) (hot idle value within 0.15V of KOEO value) LONGFT1 / LONGFT2 (value between -20 and +20) VPWR (value between 10.5 and 17.0 volts, and within 0.5 volts of battery voltage) | DPFEGR PID value not within 0.15V of KOEO value: For vehicles equipped with ESM EGR: GO to H: Exhaust Gas Recirculation System Module (ESM) STEP HH34. 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: Go to the appropriate GENERATORS & REGULATORS article. VPWR between 10.5 and 17.0 volts, but not within 0.5 of battery voltage: CHECK B(+) supply to PCM power relay (or CCRM). CHECK VPWR circuit between PCM and PCM power relay or CCRM. CHECK PWR GND circuits. |
| Verify engine operates at normal temperature | Visual (refer to STEP 2: NO DTC(S) PRESENT SYMPTOM CHART INDEX or the appropriate ENGINE COOLING article, 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 | Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1. |
| Exhaust System | GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF5. |
| Automatic Transmission | Automatic Transaxle/Transmission - Refer to the appropriate AUTOMATIC TRANSMISSION article (Diagnosis by Symptom - Poor Performance). |
| PCV System | GO to G: Positive Crankcase Ventilation (PCV) System STEP HG1. |
| Additional Checks: Correct PCM vehicle identification (VID) block information (refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM . Brake drag Base engine concerns Incorrect PCV valve Contaminated MAF sensor Intake air system | Appropriate service information article. |
| Additional Testing | GO to Z: Intermittent STEP Z1. |
Chart 11
Emissions Compliance
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Emissions Related Systems | GO to M: Emission Compliance STEP EM1. |
Chart 12
Warning Indicators
- MIL
- TCIL
- Temperature Warning Indicator Lamp or Gauge (applications with CHT sensor)
- Check Fuel Cap Indicator Lamp
Note. If the symptom is both "MIL on" AND "exhaust emission test failure", GO directly to CHART 11 . If engine is a no start, GO directly to CHART 3 . If engine runs rough at idle, GO directly to CHART 1 .
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Verify fuel filler cap is properly tightened | Visual |
| Trucks with Power Takeoff (PTO) and MIL concern: PTO input to PCM | GO to B: Power Take Off STEP FB1. |
| MIL always on when engine is running (no DTCs): MIL circuits | Crown Victoria, Grand Marquis, Marauder, Explorer Sport Trac, Ranger: GO to B: Malfunction Indicator Lamp STEP NB1. All Others: Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article. |
| TCIL always on when engine is running (no DTCs): TCIL circuits | Focus, Mustang, Town Car, Thunderbird, LS6/LS8, Freestar/Monterey, Expedition, Aviator and Navigator: Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article. All Others: GO to B: Transmission Control Switch TCS/Transmission Control Indicator Lamp TCIL STEP TB7. |
| MIL never on (including the bulb check when the engine is first started): MIL circuits | Crown Victoria, Grand Marquis, Marauder, Explorer Sport Trac, Ranger: GO to B: Malfunction Indicator Lamp STEP NB3. All others: Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article. |
| TCIL never on: TCIL circuits | Focus, Mustang, Town Car, Thunderbird, LS6/LS8, Freestar/Monterey, Expedition, Aviator and Navigator: Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article. All others: GO to B: Transmission Control Switch TCS/Transmission Control Indicator Lamp TCIL STEP TB9. |
| Temperature Warning Indicator Lamp or Gauge concerns (applications with CHT sensor only): Engine cooling system or lamp circuits | If engine is overheating: Engine Cooling - Refer to the appropriate ENGINE COOLING article. 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 DL35. |
| Check Fuel Cap Indicator Lamp Always on or off: Check fuel indicator lamp circuits | Focus (2.0L), Crown Victoria/Grand Marquis/Marauder, Ranger, Explorer Sport Trac, E-Series, and F -150 (4.2L and 4.6L): Indicator Lamp Always On: GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX47. Indicator Lamp Always Off: GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX48. All others: Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article. |
| Additional Testing | GO to Z: Intermittent STEP Z1. |
Chart 13
Automatic Transmission Concerns
- Upshift
- Downshift
- Engagement
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Transmission | Automatic Transaxle/Transmission - Refer to the appropriate AUTOMATIC TRANSMISSION article. |
| Additional Tests | GO to Z: Intermittent STEP Z1. |
Chart 14
Instrumentation
- Tachometer Inoperative
- Speedometer Inoperative
- Boost Gauge indicates higher than normal boost (supercharger applications)
- Fuel Gauge Inoperative
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Tachometer Inoperative Applications with CTO circuit from PCM pin 48: CTO circuit from PCM | GO to H: Tachometer Signal Output CTO STEP JH1. |
| 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 DP9. Applications with manual transmissions using a Vehicle Speed Sensor (VSS): GO to P: Vehicle Speed Sensor (VSS)/Transfer Case Speed Sensor (TCSS) STEP DP1. Applications with manual transmissions using an Output Shaft Speed (OSS) Sensor: GO to J: Output Shaft Speed (OSS) Sensor Introduction STEP TJ1. |
| Boost Gauge indicates higher than normal boost Supercharger bypass control Intercooler system | Supercharger bypass control: GO to J: Supercharger Bypass Control STEP KJ1. 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 hardwire circuit input to PCM (E-Series, Explorer Sport Trac, Ranger, Crown Victoria, Grand Marquis, Marauder): GO to . X: Evaporative Emission (EVAP) Monitor and System STEP HX40 All others: REFER to the appropriate INSTRUMENT CLUSTER article, fuel level indicator or Rear Electronic Module diagnosis. |
| Instrumentation | Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article. |
Chart 15
Oil System Concerns
- High Oil Consumption
- Leaks
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| PCV System | GO to G: Positive Crankcase Ventilation (PCV) System STEP HG1. |
| Base Engine | Engine System - Refer to the appropriate ENGINE article. |
| 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 - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Electric Cooling Fan Components | Mustang: GO to X: Constant Control Relay Module (CCRM) STEP X21. Crown Victoria/Grand Marquis, LS6/LS8, Thunderbird and Town Car: GO to N: Variable Speed Electric Cooling Fan STEP KN9. All Others: GO to F: Fan Control relays STEP KF56. |
| Cooling System | Engine Cooling - Refer to the appropriate ENGINE COOLING article. |
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 - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Cooling fan circuits and ACPSW or ACP circuits | Crown Victoria/Grand Marquis, Thunderbird, LS6/LS8 and Town Car: VERIFY results of Quick Test. Visually inspect cooling fan for concerns. Freestar/Monterey, Aviator: Go to Cooling System check below (also check for over-pressurized A/C system) 3.8/3.9L Mustang: GO to X: Constant Control Relay Module (CCRM) STEP X39. 4.6L Mustang: GO to X: Constant Control Relay Module (CCRM) STEP X37. All others: GO to F: Fan Control relays STEP KF55. |
| Cooling System | Engine Cooling - Refer to the appropriate ENGINE COOLING article. |
Chart 18
Exhaust System Concerns
- 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 - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Base Engine | Engine System - Refer to the appropriate ENGINE article. |
| Black Smoke: Fuel Delivery System | Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1. |
| 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 the appropriate ENGINE SYSTEMS - GENERAL INFORMATION article. |
Chart 19
Fuel System Concerns
- Odor, Engine Compartment
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Natural Gas Applications: Fuel Delivery System | GO to B: Natural Gas Fuel Delivery System STEP HB28. |
| EVAP System | GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX14. |
| Fuel System | Visual (refer to the appropriate FUEL TANKS & LINES article for system description) |
Chart 20
Engine Noise (under hood)
Note. Attempt to identify source of noise. If noise is from source other than those listed below, refer to STEP 2: NO DTC(S) PRESENT SYMPTOM CHART INDEX (for noise such as spark knock) or the appropriate service information article.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) 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)/ A/C Not Functioning
- n A/C Always On
- A/C Compressor Runs Continuously
- A/C Does Not CUT-OFF Under WOT Conditions (Mustang only)
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Mustang only: A/C electrical circuits | For lack of A/C cooling or A/C not functioning: GO to X: Constant Control Relay Module (CCRM) STEP X42 (Mustang) For A/C always on: GO to X: Constant Control Relay Module (CCRM) STEP X69 (Mustang) For A/C does not CUT-OFF under WOT conditions: GO to X: Constant Control Relay Module (CCRM) STEP X67 (Mustang) |
| A/C System | If sent here with WACF PID indicating a fault (or YES): GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS and follow direction for KOEO DTC P0645. All others: Climate Control System - Refer to the appropriate CLIMATE CONTROL SYSTEM article. |
Chart 22
Exhaust System Concerns
- Odor (Sulfur, 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 - CNG, FLEX-FUEL & GASOLINE ) 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 | Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1. |
| EVAP System | GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX14. |
| Fuel Source | Talk with 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 - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Add-on Anti-Theft Devices | Visual, check with customer. |
| Anti-Theft | Anti-Theft - Refer to the appropriate ANTI-THEFT article. |
| Base Engine (Starting System) | Starting System - Refer to the appropriate STARTERS article. |