Engine Controls - Symptom Charts (except Diesel & Hybrid)

QT1 CARRY OUT THE PCM QUICK TEST

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

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 AUTOMATIC TRANSMISSION article for diagnosis and testing.

Note. If unable to access the PCM DTCs, or a diagnostic tool communication concern exists, GO to Pinpoint Test PINPOINT TEST QA: UNABLE TO ACTIVATE SELF-TEST/NETWORK COMMUNICATION ERROR . For additional information on retrieving malfunction indicator lamp (MIL) and non-MIL DTCs, refer to Diagnostic Methods article CONTINUOUS MEMORY SELF-TEST .

Complete the preliminary checks looking for obvious concerns that may relate to the symptom. Check for the following items: related electrical connectors or fuses vacuum lines (leaks, routing) air intake system (leaks, restrictions) fuel quality (octane, contamination, winter/summer blend) cooling system (engine operating at proper temperature)
Access any related 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	No
GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS for direction to repair DTCs after noting the following: Diagnose 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 SYSTEM WIRING DIAGRAMS and identify the common cause such as SIG RTN, 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 STEP 2: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for direction to the proper symptom chart in STEP 3: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHARTS . If the symptom is not listed, REFER to the applicable service information article.

Yes

GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS for direction to repair DTCs after noting the following: Diagnose 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 SYSTEM WIRING DIAGRAMS and identify the common cause such as SIG RTN, 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 STEP 2: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for direction to the proper symptom chart in STEP 3: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHARTS . If the symptom is not listed, REFER to the applicable service information article.

STEP 2: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX

System/Symptom		Chart Number
Starting Concerns	Hard Start/Long Crank/Erratic Start/Erratic Crank	CHART NUMBER: 2
	No crank	CHART NUMBER: 23
	No start (engine cranks)	CHART NUMBER: 3
Unique Idle Concerns	Slow return to idle	CHART NUMBER: 4
	Rolling idle	CHART NUMBER: 1
	Fast idle	CHART NUMBER: 5
	Low/Slow idle	CHART NUMBER: 6

DRIVEABILITY

System/Symptom		Chart Number
Stalls/Quits	Idle/Acceleration/Cruise	CHART NUMBER: 1
	Deceleration	CHART NUMBER: 6
	Stall after start	CHART NUMBER: 1
Runs Rough		CHART NUMBER: 1
Misses		CHART NUMBER: 1
Buck/Jerk		CHART NUMBER: 1
Hesitation/Stumble		CHART NUMBER: 1
Surge		CHART NUMBER: 1
Backfires		CHART NUMBER: 7
Lack/Loss of Power		CHART NUMBER: 8
Spark Knock		CHART NUMBER: 9

DRIVEABILITY - PERFORMANCE WHILE DRIVING CONCERNS

System/Symptom	Chart Number
Diesels/Runs On	CHART NUMBER: 5
Poor Fuel Economy	CHART NUMBER: 10
Emissions Compliance	CHART NUMBER: 11

ADDITIONAL DRIVEABILITY CONCERNS

System/Symptom		Chart Number
Warning Indicators	Malfunction indicator lamp (MIL)	CHART NUMBER: 12
	Transmission control indicator lamp (TCIL)	CHART NUMBER: 12
	Power take off (PTO)	CHART NUMBER: 12
	Temperature warning indicator or gauge (for vehicles equipped with a cylinder head temperature (CHT) sensor only)	CHART NUMBER: 12
	Check fuel cap indicator	CHART NUMBER: 12
	Powertrain malfunction indicator (wrench)	CHART NUMBER: 12
Climate Control	Lack of A/C cooling, A/C not functioning	CHART NUMBER: 21
Climate Control	A/C always on or A/C compressor runs continuously	CHART NUMBER: 21
Instrumentation	Tachometer inoperative	CHART NUMBER: 14
	Speedometer/odometer inoperative	CHART NUMBER: 14
	Boost gauge indicates higher than normal boost	CHART NUMBER: 14
	Fuel gauge inoperative	CHART NUMBER: 14

ELECTRICAL

System/Symptom		Chart Number
Oil System Concerns	High oil consumption	CHART NUMBER: 15
Oil System Concerns	Leaks	CHART NUMBER: 15
Cooling System Concerns	Electric cooling fan(s) does not operate (low, medium, high or variable speed)	CHART NUMBER: 16
	Cooling fan clutch does not operate	CHART NUMBER: 16
	Electric cooling fan(s) always runs	CHART NUMBER: 17
Exhaust System Concerns	Visible smoke	CHART NUMBER: 18
Exhaust System Concerns	Odor (sulfur or rotten egg smell)	CHART NUMBER: 22
Fuel System Concerns	Odor, engine compartment	CHART NUMBER: 19
Engine Noise (under hood)		CHART NUMBER: 20

ENGINE

System/Symptom		Chart Number
Automatic Transmission (A/T) Shift Concerns	Upshift	CHART NUMBER: 13
	Downshift	CHART NUMBER: 13
	Engagement	CHART NUMBER: 13

DRIVELINE

System/Symptom		Chart Number
PTO Concerns	Not working correctly	CHART NUMBER: 12

POWER TAKE OFF (PTO)

Chart 1

Stalls/Quits: Idle, Acceleration, Cruise, Stall After Start
Runs Rough
Misses
Buck/Jerk
Hesitation/Stumble
Surge
Unique Idle Concerns: Rolling Idle
Intermittent Rough 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 TESTS -- GASOLINE MODELS unless noted)
Check the following parameter identifiers (PIDs): DPFEGR (if equipped) (hot idle value within 0.03 volt [E-Series 5.4L] or 0.15 volt [all others] of the key 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 0.03 volt (E-Series 5.4L) or 0.15 volt (all others) of key 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 appropriate CHARGING SYSTEM - GENERAL INFORMATION article . 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 INJxF PIDs (the "x" indicates the injector number) with the key ON, engine OFF. There is 1 INJxF PID for each engine cylinder. All INJxF PIDs must indicate no fault (or NO).	The INJxF PID(s) indicate a fault (an injector circuit fault is indicated). For Ford GT, GO to Pinpoint Test HL . For all others, GO to Pinpoint Test KG .
Mass Air Flow (MAF) Sensor	GO to Pinpoint Test DC .
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	GO to Pinpoint Test HX .
Charging System	GO to Pinpoint Test HY .
Automatic Transmission	REFER to the appropriate AUTOMATIC TRANSMISSION article .
Base Engine	REFER to the appropriate ENGINE article .
Intake Air System (for vehicles equipped with an idle air control [IAC] valve)	GO to Pinpoint Test HU .
A/C Pressure (ACP) Sensor	GO to Pinpoint Test DS .
Additional Testing	GO to Pinpoint Test Z .
Additional Checks: Some vehicles have a TQ_CNTL 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 powertrain control module (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 filler 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)	REFER to the applicable service information article.

Chart 2

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

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Battery Condition and Current Draw	Visual. REFER to the appropriate CHARGING SYSTEM - GENERAL INFORMATION 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	GO to Pinpoint Test HC .
Exhaust System	GO to Pinpoint Test HF .
PCV System	GO to Pinpoint Test HG .
EVAP System	GO to Pinpoint Test HX .
Intake Air System (for vehicles equipped with an IAC valve)	GO to Pinpoint Test HU .
Starting System	REFER to the appropriate STARTING SYSTEM article.
MAF Sensor	GO to Pinpoint Test DC .
Additional Testing	GO to Pinpoint Test Z .
Additional Checks: For vehicles equipped with 2 camshaft position (CMP) sensors, verify the CMP1 and CMP2 circuits are not shorted together.	Visual

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. For vehicles equipped with a secondary air injection (AIR) system, carry out the following after the no start concern is repaired: Disconnect the electric AIR pump relay, run the engine until the surplus fuel is used up, and connect the relay (disconnecting the relay may set a continuous memory PCM DTC that needs to be cleared).

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Add-on Anti-Theft Devices	Visual. CHECK with the customer.
Fuel/Ignition	For LS, GO to Pinpoint Test KB . For all others, GO to Pinpoint Test A .
Intake Air System (for vehicles equipped with an IAC valve). 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 .
Additional Testing	GO to Pinpoint Test Z .

Chart 4

Unique Idle Concerns: Slow Return To Idle

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Vacuum Leaks, Throttle Body	Visual
PCV System	GO to Pinpoint Test HG .
Intake Air System Leaks (for vehicles equipped with an IAC valve)	GO to Pinpoint Test HU .

Chart 5

Unique Idle Concerns: Fast Idle
Diesels/Runs On

Note. If the vehicle runs normally with the key in the OFF position, check for a damaged ignition switch, an IGN RUN circuit short to voltage, a VPWR circuit short to voltage. Refer to the applicable SYSTEM WIRING DIAGRAMS or service information article.

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Base Engine Check for 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. REFER to the appropriate ENGINE article .
Verify the engine operates at normal temperature.	Visual. REFER to the appropriate ENGINE COOLING article or STEP 2: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX , to diagnose any cooling system concerns that are present.
Fast idle concerns (for vehicles equipped with an IAC valve) With the key 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 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. CHECK for loose or worn throttle plates. If no concern is found, GO to Pinpoint Test Z .
Intake Air System Leaks (for vehicles equipped with an IAC valve)	GO to Pinpoint Test HU .
Additional Testing	GO to Pinpoint Test Z .

Chart 6

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

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Verify the fuel filler cap is properly tightened.	Visual
Automatic Transmission (stalls/quits on deceleration)	REFER to the appropriate AUTOMATIC TRANSMISSION article to diagnose the torque convertor operation concerns.
Fuel Delivery System	GO to Pinpoint Test HC .
Intake Air System (for vehicles equipped with an IAC valve)	GO to Pinpoint Test HU .
Charging System	GO to Pinpoint Test HY .
Base Engine	REFER to the appropriate ENGINE article .
Additional Testing	GO to Pinpoint Test Z .

Chart 7

Backfires

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- 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 the appropriate ENGINE article .
Exhaust System	GO to Pinpoint Test HF .
Additional Testing	GO to Pinpoint Test Z .

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, a lack of power may result when the vehicle is operated with a breakout box installed at the PCM. The knock sensor circuits are not shielded in the breakout box, and knock sensor 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 TESTS -- GASOLINE MODELS article unless noted)
Automatic Transmission Fluid	Visual
Throttle Linkage	Visual
Air Cleaner Element	Visual
Check the following PIDS: DPFEGR (if equipped) (hot idle value within 0.15 volt of key ON, engine OFF value) LONGFT1/LONGFT2 (value between -20 and +20%) IMTVF (if equipped): For both key ON, engine OFF and key 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.	DPFEGR PID value not within 0.15 volt of key ON, engine OFF value: For vehicles equipped with an 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. 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 .
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 Sensor	GO to Pinpoint Test DK .
Base Engine	REFER to the appropriate ENGINE article .
Automatic Transmission	REFER to the appropriate AUTOMATIC TRANSMISSION article .
Brake System Drag or Binding	REFER to the BRAKE SYSTEM - GENERAL INFORMATION .
Supercharger Bypass System	GO to Pinpoint Test KJ .
Additional Testing	GO to Pinpoint Test Z .
Additional Checks: Some vehicles have a TQ_CNTL 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) . 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 applicable service information article .

Chart 9

Spark Knock

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Verify the engine operates at normal temperature	Visual. REFER to the appropriate ENGINE COOLING article or STEP 2: 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 proper coolant concentrations and fill procedures.
MAF Sensor	GO to Pinpoint Test DC .
Base Engine	REFER to the appropriate ENGINE article .
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

Poor Fuel Economy

Note. Driving styles may have a significant influence on fuel economy. Verify the concern before starting an in-depth diagnosis. The following external factors may contribute to poor fuel economy

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 TESTS -- GASOLINE MODELS unless noted)
Check the following PIDs: DPFEGR (if equipped) (hot idle value within 0.15 volt of key 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 key ON, engine OFF value: For vehicles equipped with an 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 appropriate CHARGING SYSTEM - GENERAL INFORMATION article . 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 todiagnose 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 TRANSMISSION article .
PCV System	GO to Pinpoint Test HG .
Additional Checks: Correct PCM 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

Emissions Compliance

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Emissions Related Systems	GO to Pinpoint Test EM .

Chart 12

Warning Indicators: Check Fuel Cap Indicator, Malfunction Indicator Lamp (MIL), Power Take Off (PTO), Temperature Warning Indicator or Gauge (applications with 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.

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Verify the fuel filler cap is properly tightened.	Visual
Check Fuel Cap Indicator Never/always on	For Ranger, GO to Pinpoint Test HX . For all others, REFER to the appropriate INSTRUMENT CLUSTER article .
MIL Always on when the engine is running (no DTCs present) Never on (including during indicator prove out)	For Ranger, GO to Pinpoint Test NB . For all others, REFER to the appropriate INSTRUMENT CLUSTER article .
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 . 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	For E-Series and Ranger, GO to Pinpoint Test TB . For all others, REFER to the appropriate INSTRUMENT CLUSTER article .
Powertrain Malfunction Indicator (Wrench) Never/always on	REFER to the appropriate INSTRUMENT CLUSTER article .
Additional Testing	GO to Pinpoint Test Z .

Chart 13

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

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Transmission	REFER to the appropriate AUTOMATIC TRANSMISSION article .
Additional Tests	GO to Pinpoint Test Z .

Chart 14

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

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Tachometer Inoperative (for vehicles equipped with a CTO circuit from the PCM)	GO to Pinpoint Test JH .
Speedometer/Odometer Inoperative	GO to Pinpoint Test DP .
Boost Gauge (for vehicles equipped with a supercharger) Indicates higher than normal boost	For supercharger bypass control concerns, GO to Pinpoint Test KJ . For intercooler system concerns, GO to Pinpoint Test KP .
Fuel Gauge Inoperative Fuel gauge always indicates full or empty	For Ranger, GO to Pinpoint Test HX . For all others, REFER to the appropriate INSTRUMENT CLUSTER article .
Instrumentation	REFER to the appropriate INSTRUMENT CLUSTER article .

Chart 15

Oil System Concerns: High Oil Consumption, Leaks

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
PCV System	GO to Pinpoint Test HG .
Base Engine	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), Cooling Fan Clutch Does Not Operate

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Electric Cooling Fan	For Crown Victoria/Grand Marquis, Five Hundred/Freestyle/Montego, Fusion/Milan/Zephyr, LS, 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 .

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 TESTS -- GASOLINE MODELS unless noted)
Cooling Fan A/C pressure switch (ACPSW) or ACP sensor circuits	For Crown Victoria/Grand Marquis, Five Hundred/Freestyle/Montego, Fusion/Milan/Zephyr, LS, and Town Car, VERIFY the results of the PCM self-test. Visually INSPECT the cooling fan for concerns. For all others, GO to Pinpoint Test KF .
Cooling System	REFER to the appropriate ENGINE COOLING article .

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 TESTS -- GASOLINE MODELS unless noted)
Base Engine	REFER to the appropriate ENGINE article .
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 .
PCV System Blue smoke	REFER to the appropriate ENGINE SYSTEM - GENERAL INFORMATION article for a description of the Oil Consumption Test.

Chart 19

Fuel System Concerns: Odor, Engine Compartment

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- 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 STEP 2: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX (for noise such as spark knock) or the applicable service information article.

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Secondary Ignition System	For vehicles equipped with a coil pack ignition system, GO to Pinpoint Test JC .
Snap noise that may be due to secondary ignition arcing.	For all others, CHECK the condition of the spark plug boots.

Chart 21

Climate Control: Lack of A/C Cooling, A/C Not Functioning, A/C Always On, or A/C Compressor Runs Continuously

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
A/C System	If sent here from the service information article with WACF PID indicating a fault (or YES), GO to , DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS and follow the directions for KOEO DTC P0645. For all others, REFER to the appropriate CLIMATE CONTROL SYSTEM - GENERAL INFORMATION article .

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), 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 TESTS -- 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. Sulfur content can vary in different fuels. Suggest trying a different fuel source.

Chart 23

Starting Concerns: No Crank

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TESTS -- GASOLINE MODELS unless noted)
Add-on Anti-Theft Devices	Visual. CHECK with the customer.
Anti-Theft	REFER to the appropriate ANTI-THEFT article .
Base Engine Starting system	REFER to the appropriate STARTING SYSTEM article .

Engine Controls - Symptom Charts (except Diesel & Hybrid) Lincoln Zephyr US