Engine Controls - Symptom Charts (except Diesel & Hybrid) — Mercury Mariner II рестайлинг (2011-2011)

QT1 CARRY OUT THE PCM QUICK TEST

Note. For vehicles indicating not ready for inspection maintenance (I/M) testing, refer to the Owner's Literature, Readiness For Inspection/Maintenance (I/M) Testing to complete the system readiness. If an I/M testing system readiness concern is still present, GO to PINPOINT TEST QC .

Note. If the vehicle was brought in with an emission compliance concern, GO to PINPOINT TEST EM .

Note. For applications that use a stand-alone transmission control module (TCM), the PCM does not output TCM related diagnostic trouble codes (DTCs). Refer to the appropriate transmission article(s), diagnostic strategy to continue diagnosis.

Note. If unable to access the PCM DTCs, or a scan tool communication concern exists, GO to PINPOINT TEST QA . For additional information on retrieving malfunction indicator lamp (MIL) and non-MIL DTCs, refer to QUICK TEST DESCRIPTION for the Continuous Memory Self-Test.

Complete the preliminary checks looking for obvious concerns that may relate to the symptom. Check for the following items: fuses electrical circuits and connectors vacuum lines (leaks, routing) air intake system (leaks, restrictions) fuel quality (octane, contamination, winter/summer blend) cooling system (engine operating at correct temperature)
Access any related On-line Automotive Service Information System (OASIS) or Technical Service Bulletin (TSB) information (if available).
Carry out the PCM self-test to access any DTCs. Record any key on engine off (KOEO), key on engine running (KOER) (if the engine runs) and continuous memory (MIL and non-MIL) DTCs.

Are any DTCs present?

Yes

GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS for direction to repair DTCs after noting the following

DIAGNOSE the DTCs in the following order (begin diagnosis with the first DTC output in that mode and diagnose any circuit related DTCs first). For multiple circuit DTCs that are set as a result of a concern with more than one component, REFER to the apprpropriate Manual electronic Engine Controls Cells and identify the common cause such as SIGRTN, VREF, or VPWR. CONTINUE DTC diagnosis by referring to the appropriately identified pinpoint test.

Any KOEO self-test DTCs
Any KOER self-test DTCs
Any continuous memory self-test DTCs. Retrieve any available freeze frame data and disregard any identical/related continuous DTCs already repaired.

GO to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for direction to the correct symptom chart in No Diagnostic Trouble Codes (DTCs) Present Symptom Charts .

If the symptom is not listed, REFER to the appropriate Electronic Engine Controls article to continue diagnosis.

No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index

Driveability

System/Symptom		Oasis Number	Chart Number
Starting Concerns	Hard Start/Long Crank/Erratic Start/Erratic Crank	602300	Chart Number: 2
	No crank	601300	Chart Number: 22
	No start (engine cranks)	603300	Chart Number: 3
Unique Idle Concerns	Slow return to idle	617400	Chart Number: 4
	Rolling idle	618400	Chart Number: 1
	Fast idle	619400	Chart Number: 5
	Low/Slow idle	607400	Chart Number: 6

SYMPTOM CHART - DRIVEABILITY

Driveability - Performance While Driving Concerns

System/Symptom		Oasis Number	Chart Number
Stalls/Quits	Idle/Acceleration/Cruise	607x00	Chart Number: 1
	Deceleration	607700	Chart Number: 6
	Stall after start	607000	Chart Number: 1
Runs Rough		608x00	Chart Number: 1
Misses		609x00	Chart Number: 1
Buck/Jerk		610x00	Chart Number: 1
Hesitation/Stumble		611x00	Chart Number: 1
Surge		612x00	Chart Number: 1
Backfires		613x00	Chart Number: 7
Lack/Loss of Power		614x00	Chart Number: 8
Spark Knock		615x00	Chart Number: 9

SYMPTOM CHART - DRIVEABILITY (PERFORMANCE WHILE DRIVING CONCERNS)

Note. OASIS identifiers (the x means any number (1-9) can be used) xxx4xx equals during idle, xxx5xx equals during acceleration, xxx6xx equals during cruise, xxx7xx equals during deceleration.

Additional Driveability Concerns

System/Symptom	Oasis Number	Chart Number
Diesels/Runs On	621000	Chart Number: 5
Poor Fuel Economy	622000	Chart Number: 10
Emissions Compliance	623000	Chart Number: 11

SYMPTOM CHART - ADDITIONAL DRIVEABILITY CONCERNS

Electrical

System/Symptom		Oasis Number	Chart Number
Warning Indicators	Malfunction indicator lamp (MIL)	698298	Chart Number: 12
	Transmission control indicator lamp (TCIL)	698298	Chart Number: 12
	Power take off (PTO)	507000	Chart Number: 12
	Temperature warning indicator or gauge (for vehicles equipped with a cylinder head temperature (CHT) sensor only)	206000	Chart Number: 12
	Check fuel cap indicator	206000	Chart Number: 12
	Powertrain malfunction indicator (wrench)	698298	Chart Number: 12
Instrumentation	Tachometer inoperative	204000	Chart Number: 14
	Speedometer/odometer inoperative	204000	Chart Number: 14
	Boost gauge indicates higher than normal boost	204000	Chart Number: 14
	Fuel gauge inoperative	204000	Chart Number: 14

SYMPTOM CHART - ELECTRICAL

Engine

System/Symptom		Oasis Number	Chart Number
Oil System Concerns	High oil consumption	401000	Chart Number: 15
Oil System Concerns	Leaks	401000	Chart Number: 15
Cooling System Concerns	Electric cooling fan(s) does not operate (low, high or variable speed)	402000	Chart Number: 16
	Cooling fan clutch does not operate	402000	Chart Number: 16
	Electric cooling fan(s) always runs	402000	Chart Number: 17
Exhaust System Concerns	Visible smoke	403000	Chart Number: 18
Exhaust System Concerns	Odor (sulfur or rotten egg smell)	403000	Chart Number: 21
Fuel System Concerns	Odor, engine compartment	404000	Chart Number: 19
Engine Noise (under hood)		497000	Chart Number: 20

SYMPTOM CHART - ENGINE

Driveline

System/Symptom		Oasis Number	Chart Number
Automatic Transmission (A/T) Shift Concerns	Upshift	501000	Chart Number: 13
	Downshift	502000	Chart Number: 13
	Engagement	503000	Chart Number: 13

SYMPTOM CHART - DRIVE LINE

Power Take Off (PTO)

System/Symptom		Oasis Number	Chart Number
PTO Concerns	Not working correctly	507000	Chart Number: 12

SYMPTOM CHART - POWER TAKE OFF

Chart 1

Stalls/Quits: Idle, Acceleration, Cruise, Stall After Start
Runs Rough
Misses
Buck/Jerk
Hesitation/Stumble
Surge
Unique Idle Concerns: Rolling Idle

Note. For some vehicle 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 evaporative emission (EVAP) system.

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Check the following parameter identifiers (PIDs): DPFEGR (if equipped) (hot idle value within 0.15 volt of the ignition ON, engine OFF 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 ignition ON, engine OFF value: For vehicles equipped with an exhaust gas recirculation system module (ESM), GO to PINPOINT TEST HH . For all others, GO to PINPOINT TEST HE . 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 the apprpropriate Chargine System article and carry out the Inspection and Verification to continue diagnosis. VPWR between 10.5 and 17.0 volts, but not within 0.5 volt of battery voltage: CHECK the B+ voltage to the powertrain control module (PCM) power relay. CHECK the VPWR circuit between the PCM and the PCM power relay. CHECK the PWR GND circuits.
For vehicles that run rough at idle: Check the INJx_F PIDs (the "x" indicates the injector number) with the ignition ON, engine running. There is 1 INJx_F PID for each engine cylinder. All INJx_F PIDs must indicate no fault (or NO).	The INJx_F PID(s) indicate a fault (an injector circuit concern is indicated). For F-150 3.5L, Flex GTDI 3.5L, MKS 3.5L, MKT 3.5L and Taurus GTDI 3.5L vehicles, GO to PINPOINT TEST DI . For all others, GO to PINPOINT TEST KG .
Mass Air Flow (MAF) Sensor	GO to PINPOINT TEST DC .
Manifold Absolute Pressure (MAP) Sensor (F-150 3.5L, Flex GTDI 3.5L, MKS 3.5L, MKT 3.5L and Taurus GTDI 3.5L)	GO to PINPOINT TEST DN .
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 PINPOINT TEST HF .
Positive Crankcase Ventilation (PCV) System	GO to PINPOINT TEST HG .
EVAP System	For Fiesta, GO to PINPOINT TEST HZ . For all others, GO to PINPOINT TEST HX .
Charging System	Visual. REFER to the appropriate Charging System article and carry out the Inspection and Verification to continue diagnosis.
Universal Heated Oxygen Sensor (HO2S) (Edge, Escape, E-Series 4.6L, E-Series 5.4L, Expedition, Explorer, F-150, Fusion 2.5L, Fusion 3.0L, Flex, F-Series Super Duty, Mariner, Milan, MKS, MKT, MKX, Mustang, Navigator, and Taurus)	GO to PINPOINT TEST DZ .
Automatic Transmission	REFER to the appropriate Automatic Transaxle/Transmission, Diagnosis By Symptom to continue diagnosis.
Base Engine	REFER to the appropriate Engine article and carry out the Inspection and Verification to continue diagnosis.
Intake Air System	GO to PINPOINT TEST HU .
Additional Testing	GO to PINPOINT TEST Z .
Additional Checks: Some vehicles have a TQ_CNTRL PID available. Check this PID to determine if the PCM is reducing torque, and if so, why the torque is being reduced. As a PID display example; 0 equals no torque reduction requested, 1 equals torque truncation, which cuts fuel to protect when line pressure falls to minimum limit and 2 equals traction control event, which cuts fuel/spark for traction control. Correct PCM vehicle identification (VID) block information. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) to carry out the Making Changes to the VID Block procedure. 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 filler cap is correctly tightened or the capless fuel tank filler pipe is correctly sealed 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)	REFER to the appropriate service information
Brake Over Accelerator	For Fiesta with brake over accelerator feature activation, CHECK for simultaneous brake pedal and accelerator pedal operation inadvertently activating the brake over accelerator feature. ADVISE the customer that simultaneous brake pedal and accelerator pedal operation by the vehicle operator activates the brake over accelerator feature. For all others with brake over accelerator feature activation, CHECK the BRKOVR_ACTION, BRKOVRD_POSS, and DIST_BRKOVRD PIDs for recent simultaneous brake pedal and accelerator pedal operation. ADVISE the customer that simultaneous brake pedal and accelerator pedal operation by the vehicle operator activates the brake over accelerator feature. REFER to POWERTRAIN CONTROL SOFTWARE for additional information.

SYMPTOM CHART

Chart 2

Starting Concerns: Hard Start/Long Crank/Erratic Start/Erratic Crank

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Battery Condition and Current Draw	REFER to the appropriate Charging System article and carry out the Inspection and Verification to continue diagnosis.
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 PINPOINT TEST HF .
Positive Crankcase Ventilation (PCV) System	GO to PINPOINT TEST HG .
EVAP System	For Fiesta, GO to PINPOINT TEST HZ . For all others, GO to PINPOINT TEST HX .
Intake Air System	GO to PINPOINT TEST HU .
Starting System	REFER to the appropriate Starting System article and diagnose the engine cranks slowly symptom.
Mass Air Flow (MAF) Sensor	GO to PINPOINT TEST DC .
Additional Testing	GO to PINPOINT TEST Z .
Additional Checks: For vehicles equipped with two camshaft position (CMP) sensors, verify the CMP1 and CMP2 circuits are not shorted together.	Visual.

SYMPTOM CHART - STARTING CONCERNS: HARD START/LONG CRANK/ERRATIC START/ERRATIC CRANK

Chart 3

Starting Concerns: No Start (Engine Cranks)

Note. An extended crank because of a no start may load the exhaust system with raw fuel, damaging the catalytic converter after the engine starts.

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Add-on Anti-Theft Devices	Visual. CHECK with the customer.
Fuel/Ignition	GO to PINPOINT TEST A .
Intake Air System (Ranger). If the engine will not start at closed throttle, but will start and run normally at part throttle, check the IAC valve.	GO to PINPOINT TEST KE .
Exhaust System Restrictions	GO to PINPOINT TEST HF .
Base Engine	REFER to the appropriate Engine article and carry out the Inspection and Verification to continue diagnosis.
Additional Testing	GO to PINPOINT TEST Z .

SYMPTOM CHART - STARTING CONCERNS: NO START (ENGINE CRANKS)

Chart 4

Unique Idle Concerns: Slow Return To Idle

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Vacuum Leaks, Throttle Body	Visual.
Positive Crankcase Ventilation (PCV) System	GO to PINPOINT TEST HG .
Intake Air System Leaks	GO to PINPOINT TEST HU .

SYMPTOM CHART - UNIQUE IDLE CONCERNS: SLOW RETURN TO IDLE

Chart 5

Unique Idle Concerns: Fast Idle
Diesels/Runs On

Note. If the vehicle runs normally with the ignition in the OFF position, check for a damaged ignition switch, an IGN START/RUN or ISP-R circuit short to voltage, or a VPWR circuit short to voltage.

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Base Engine Check for air leaks, including correct sealing of intake manifold and components/vacuum lines attached to intake air (such as the PCV, EGR or IAC valve/vacuum lines).	Visual. REFER to the appropriate Engine article and carry out the Inspection and Verification to continue diagnosis.
Verify the engine operates at normal temperature.	Visual. REFER to the appropriate Engine Cooling article or NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX , to diagnose any cooling system concerns that are present.
Fast idle concerns (Ranger) With the ignition ON, engine OFF 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: At vehicle start, the TPREL begins at about 1.25 volts and counts down to the lowest TP voltage value seen since engine start. If the TP voltage value goes below the normal range, then increases again, TPREL sets to the lower voltage. If the TP voltage is about 0.04 volt greater than the TPREL value at closed throttle, the PCM goes into part throttle mode. MONITOR the TP voltage and TPREL PIDs for sudden changes while checking for intermittent TP circuit/connector concerns. CHECK for loose or worn throttle plates. If no concern is found, GO to PINPOINT TEST Z .
Intake Air System Leaks	GO to PINPOINT TEST HU .
Additional Testing	GO to PINPOINT TEST Z .

SYMPTOM CHART - FAST IDLE AND DIESELS/RUNS ON

Chart 6

Unique Idle Concerns: Low/Slow Idle
Stalls/Quits: Deceleration

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Verify the fuel filler cap is correctly tightened or the capless fuel tank filler pipe is correctly sealed.	Visual.
Automatic Transmission (stalls/quits on deceleration)	REFER to the appropriate Automatic Transaxle/Transmission article to diagnose the torque convertor operation concerns.
Fuel Delivery System	GO to PINPOINT TEST HC .
Intake Air System	GO to PINPOINT TEST HU .
Charging System	REFER to the appropriate Charging System article and carry out the Inspection and Verification to continue diagnosis.
Universal Heated Oxygen Sensor (HO2S) (Edge, Escape, E-Series 4.6L, E-Series 5.4L, Expedition, Explorer, F-150, Fusion 2.5L, Fusion 3.0L, Flex, F-Series Super Duty, Mariner, Milan, MKS, MKT, MKX, Mustang, Navigator, and Taurus)	GO to PINPOINT TEST DZ .
Base Engine	REFER to the appropriate Engine System and carry out the Inspection and Verification to continue diagnosis.
Additional Testing	GO to PINPOINT TEST Z .

SYMPTOM CHART - LOW/SLOW IDLE AND DECELERATION

Chart 7

Backfires

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test 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 the appropriate Engine article and carry out the Inspection and Verification to continue diagnosis.
Exhaust System	GO to PINPOINT TEST HF .
Additional Testing	GO to PINPOINT TEST Z .

SYMPTOM CHART - BACKFIRES

Chart 8

Lack/Loss of Power

Note. Verify the symptom is reported under normal driving conditions without excessive engine or vehicle load. Also, be aware of the engine RPM/speed limiting functions of the PCM.

Note. For vehicles equipped 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 a breakout box, and KS signal noise may be noticed by the PCM. If this happens, spark timing is retarded and a lack of power may result.

Note. For applications with a KS, a lack of power may result if the engine has developed an abnormal noise. The KS may interpret some abnormal noise as detonation and retard spark timing.

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Automatic Transmission Fluid	Visual.
Throttle Linkage	Visual.
Air Cleaner Element	Visual.
Check the following PIDS: LONGFT1/LONGFT2 (value between -20 and +20%) IMTVF (if equipped): For both ignition ON, engine OFF and ignition ON, engine running 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.	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 PINPOINT TEST HU .
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 PINPOINT TEST DC .
Exhaust System	GO to PINPOINT TEST HF .
Variable Camshaft Timing (VCT) System	GO to PINPOINT TEST HK .
Accelerator Pedal Position (APP) Sensor	GO to PINPOINT TEST DK .
Base Engine	REFER to the appropriate Engine article and carry out the Inspection and Verification to continue diagnosis.
Automatic Transmission	REFER to the appropriate Automatic Transaxle/Transmission, Shift Point Road Test to continue diagnosis.
Brake System Drag or Binding	REFER to the appropriate Brake article
Supercharger Bypass System	GO to PINPOINT TEST KJ .
Turbocharger System	GO to PINPOINT TEST HN .
Additional Testing	GO to PINPOINT TEST Z .
Additional Checks: Some vehicles have a TQ_CNTRL PID available. Check this PID to determine if the PCM is reducing torque, and if so, why the torque is being reduced. As a PID display example; 0 equals no torque reduction requested, 1 equals torque truncation, which cuts fuel to protect when line pressure falls to minimum limit, and 2 equals traction control event, which cuts fuel/spark for traction control. Customer driving habits Correct PCM vehicle identification (VID) block information. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) to carry out the Making Changes to the VID Block procedure. Intake manifold runner control (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 appropriate service information.

SYMPTOM CHART - LACK/LOSS OF POWER

Chart 9

Spark Knock

Note. Carbon build up in the combustion chamber and on the back of valves can be a contributing factor for engine spark knock concerns. Remove carbon deposits prior to any component replacements.

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Verify the engine operates at normal temperature	Visual. REFER to the appropriate Engine Cooling article or NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX to diagnose any cooling system concerns that are present.
Verify correct coolant level and coolant concentration	REFER to the appropriate Engine Cooling article for correct coolant concentrations and fill procedures.
Mass Air Flow (MAF) Sensor	GO to PINPOINT TEST DC .
Base Engine	REFER to the appropriate Engine article and carry out the Inspection and Verification to continue diagnosis.
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 .
Positive Crankcase Ventilation (PCV) System	GO to PINPOINT TEST HG .
Engine Oil Quality	Visual.
Additional Testing	GO to PINPOINT TEST Z .

SYMPTOM CHART - SPARK KNOCK

Chart 10

Poor Fuel Economy

Note. Driving styles may have a significant influence on fuel economy. Verify the concern before starting an in-depth diagnosis. If available, use the integrated diagnostic system (IDS) fuel economy test to verify a concern is present. The following external factors may contribute to poor fuel economy

stop and go driving
incorrect tire pressure and size
vehicle loads (such as trailer towing)
extended winter warm-up conditions
high speed driving
incorrect axle ratio
road/weather conditions
aftermarket add-ons
short run operations
customer expectations

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Check the following PIDs: LONGFT1/LONGFT2 (value between -20 and +20%) VPWR (value between 10.5 and 17.0 volts, and within 0.5 volt of battery voltage)	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 the appropriate Charging System article and carry out the Inspection and Verification to continue diagnosis. VPWR between 10.5 and 17.0 volts, but not within 0.5 volt of battery voltage: CHECK the B+ voltage to the PCM power relay. CHECK the VPWR circuit between the PCM and the PCM power relay. CHECK the PWR GND circuits.
Verify the engine operates at normal temperature.	Visual. REFER to the appropriate Engine Cooling article, Symptom Chart 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 PINPOINT TEST HF .
Variable Camshaft Timing (VCT) System	GO to PINPOINT TEST HK .
Transmission Fluid Level	Visual.
Automatic Transmission	REFER to the appropriate Automatic Transaxle/Transmission article, Diagnosis By Symptom to continue diagnosis.
Positive Crankcase Ventilation (PCV) System	GO to PINPOINT TEST HG .
Additional Checks: Correct PCM VID block information. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) to carry out the Making Changes to the VID Block procedure. Brake drag Base engine concerns Incorrect PCV valve Contaminated MAF sensor Intake air system	REFER to the appropriate service information.
Additional Testing	GO to PINPOINT TEST Z .

SYMPTOM CHART

Chart 11

Emissions Compliance

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Emissions Related Systems	GO to PINPOINT TEST EM .

SYMPTOM CHART - EMISSIONS COMPLIANCE

Chart 12

Warning Indicators: Check Fuel Cap Indicator, Malfunction Indicator Lamp (MIL), Power Take Off (PTO), Temperature Warning Indicator or Gauge (applications with cylinder head temperature [CHT] sensor only), Transmission Control Indicator Lamp (TCIL), Powertrain Malfunction Indicator (Wrench)
PTO Concerns: 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. SYMPTOM CHART - WARNING INDICATORS AND PTO CONCERNS SYSTEM/COMPONENT REFERENCE ( Pinpoint Test unless noted) Verify the fuel filler cap is correctly tightened or the capless fuel tank filler pipe is correctly sealed. Visual. Check Fuel Cap Indicator Never/always on REFER to the appropriate INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article , to diagnose the check fuel cap indicator is never/always on or to diagnose the CHECK FUEL CAP warning is inoperative. MIL Always on when the engine is running (no DTCs present) Never on (including during indicator prove out) REFER to the appropriate INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article , and carry out the Inspection and Verification to continue diagnosis. PTO PTO indicator never/always on PTO not working correctly GO to PINPOINT TEST FB . Temperature Warning Indicator or Gauge (applications with CHT sensor only) Engine cooling system Indicator circuits For an engine that is overheating, REFER to the appropriate ENGINE COOLING article to diagnose the engine overheating symptom . Be aware that since a PCM DTC is not present, the PCM is not attempting to activate the indicator. For an engine operating at normal temperature, GO to PINPOINT TEST DL . TCIL Always on when the engine is running (no DTCs present) Never on REFER to the appropriate INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article. Powertrain Malfunction Indicator (Wrench) Never/always on REFER to the INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article , to diagnose the wrench indicator is never/always on or to diagnose the POWERTRAIN MALFUNCTION warning is inoperative. Additional Testing GO to PINPOINT TEST Z .

Chart 13

Automatic Transmission (A/T) Shift Concerns: Upshift, Downshift, Engagement

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Transmission	REFER to the appropriate Automatic Transaxle/Transmission article, Shift Point Road Test to continue diagnosis.
Additional Tests	GO to PINPOINT TEST Z .

SYMPTOM CHART - AUTOMATIC TRANSMISSION (A/T) SHIFT CONCERNS: UPSHIFT, DOWNSHIFT, ENGAGEMENT

Chart 14

Instrumentation: Tachometer Inoperative, Speedometer/Odometer Inoperative, Boost Gauge Indicates Higher Than Normal Boost, Fuel Gauge Inoperative

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Tachometer Inoperative	REFER to the appropriate INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article to diagnose the incorrect tachometer indication.
Speedometer/Odometer Inoperative	REFER to the appropriate INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article to diagnose the inoperative speedometer/odometer.
Boost Gauge (for vehicles equipped with a supercharger) Indicates higher than normal boost	For supercharger bypass control concerns, GO to PINPOINT TEST KJ . For charge air cooler (CAC) system concerns, GO to PINPOINT TEST KP .
Fuel Gauge Inoperative Fuel gauge always indicates full or empty	REFER to the appropriate INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article to diagnose the incorrect fuel gauge indication.
Instrumentation	REFER to the appropriate INSTRUMENTATION SYSTEM, MESSAGE CENTER & WARNING CHIMES article.

SYMPTOM CHART - INSTRUMENTATION

Chart 15

Oil System Concerns: High Oil Consumption, Leaks

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Positive Crankcase Ventilation (PCV) System	GO to PINPOINT TEST HG .
Base Engine	REFER to the appropriate Engine article and carry out the Inspection and Verification to continue diagnosis.
Additional Checks External leaks Correct dipstick Correct oil viscosity Turbocharger System	Visual.

SYMPTOM CHART - OIL SYSTEM CONCERNS: HIGH OIL CONSUMPTION, LEAKS

Chart 16

Cooling System Concerns: Electric Cooling Fan(s) Does Not Operate (Low, High or Variable Speed), Cooling Fan Clutch Does Not Operate

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Electric Cooling Fan	For Crown Victoria, Edge, Explorer, Flex, Fusion, Grand Marquis, Milan, MKS, MKT, MKX, MKZ, Taurus and Town Car, GO to PINPOINT TEST KN . For all others, GO to PINPOINT TEST KF .
Cooling Fan Clutch	GO to PINPOINT TEST HV .
Cooling System	REFER to the appropriate ENGINE COOLING article to diagnose the cooling system concern.

SYMPTOM CHART - COOLING SYSTEM CONCERNS

Chart 17

Cooling System Concerns: Electric Cooling Fan(s) Always Runs

Note. This chart is only intended to diagnose an electric cooling fan that always runs with a cool engine and the A/C and defroster off.

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Cooling Fan	For Crown Victoria, Edge, Explorer, Flex, Fusion, Grand Marquis, Milan, MKS, MKT, MKX, MKZ, Taurus and Town Car, GO to PINPOINT TEST KN . For all others, GO to PINPOINT TEST KF .
Cooling System	REFER to the appropriate ENGINE COOLING article, The Engine Overheats to diagnose the cooling system concern.

SYMPTOM CHART - COOLING SYSTEM CONCERNS: ELECTRIC COOLING FAN(S) ALWAYS RUNS

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 unless noted)
Base Engine	REFER to the appropriate Engine article and carry out the Inspection and Verification to continue diagnosis.
Fuel Delivery System Black smoke	GO to PINPOINT TEST HC .
Ignition System Black smoke	For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . For all others, GO to PINPOINT TEST JB .
Positive Crankcase Ventilation (PCV) System Blue smoke	REFER to the appropriate Engine article for a description of the Oil Consumption Test.
Turbocharger System Blue smoke	REFER to the appropriate FUEL CHARGING AND CONTROLS- Turbocharger for the Oil Consumption Test.

SYMPTOM CHART - EXHAUST SYSTEM CONCERNS: VISIBLE SMOKE

Chart 19

Fuel System Concerns: Odor, Engine Compartment

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
EVAP System	Visual.
Fuel System	Visual. GO to PINPOINT TEST HC .

SYMPTOM CHART - FUEL SYSTEM CONCERNS: ODOR, ENGINE COMPARTMENT

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 NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX (for noise such as spark knock) or the appropriate service information to continue diagnosis .

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Secondary Ignition System Snap noise that may be due to secondary ignition arcing.	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.
Turbocharger System	REFER to the appropriate FUEL CHARGING AND CONTROLS article - Turbocharger to diagnose the turbocharger noise.

SYMPTOM CHART - ENGINE NOISE (UNDER HOOD)

Chart 21

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), either from a new vehicle or new catalyst, are likely to have a sulfur smell due to the highly active state of new catalysts. Installing a new catalyst may actually make the symptom worse.

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Check for any driveability or exhaust smoke symptoms.	REFER to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for direction to repair other symptoms.
Fuel Delivery System	GO to PINPOINT TEST HC .
Fuel Source	Talk with the customer. Sulfur content can vary in different fuels. Suggest trying a different fuel source.

SYMPTOM CHART - EXHAUST SYSTEM CONCERNS: ODOR (SULFUR OR ROTTEN EGG SMELL)

Chart 22

Starting Concerns: No Crank

SYSTEM/COMPONENT	REFERENCE ( Pinpoint Test unless noted)
Add-on Anti-Theft Devices	Visual. CHECK with the customer.
Anti-Theft	REFER to the appropriate ANTI-THEFT SYSTEM - ANTI-THEFT PERIMETER article and diagnose the vehicle does not start symptom.
Base Engine Starting system	REFER to the appropriate Starting System article and diagnose the engine does not crank symptom.

SYMPTOM CHART - STARTING CONCERNS: NO CRANK

Engine Controls - Symptom Charts (except Diesel & Hybrid) Mercury Mariner II рестайлинг