On Board Diagnostics II PCED

1999 PCED On Board Diagnostics II

SECTION 3: Symptom Charts

Step 3: No DTC(s) Present Symptom Charts

Chart 1

Starting Concerns: Stalls After Start
Stalls/Quits
Runs Rough
Misses
Buck/Jerk
Hesitation/Stumble
Surge
Unique Idle concerns: Rolling Idle

Note: For stalls on the following applications: Escort/Tracer (for 4V - late year production), Contour/Mystique/Cougar (w/ returnless fuel system), 3.0L Taurus/Sable, Mustang, Crown Victoria/Grand Marquis,Town Car and LS6/LS8; 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 (Section 5 Pinpoint Test 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: HE100 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 Charging System - General Information Section 414-00 of the Workshop Manual. VPWR between 10.5 and 17.0 volts, but not within 0.5 of battery voltage: CHECK B(+) supply to power relay (or CCRM). CHECK VPWR circuit between PCM and 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"?	INJxF PID(s) indicate "yes" (an injector circuit fault is indicated): Natural Gas applications: HA60 All others: H56
For engine now starts but stalls in PARK or NEUTRAL: If engine will start and run normally at part throttle, check Idle Air Control (IAC) System.	Engine will start and run normally, instead of stalling, at part throttle: KE2
Mass Air Flow (MAF) Sensor	DC25
Secondary Ignition System	JB1
Fuel Delivery System	For Natural Gas Applications: HB1 All Others: HC1
Exhaust System	HF1
PCV System	HG1
Natural Gas applications with rough idle: Injector circuits between NG module and injectors.	HA57
EVAP System	For Taurus Flex Fuel: If symptom is "engine stalls"; HX95 . For other symptoms; HX92 . All others: If symptom is "engine stalls"; HX19 . For other symptoms; HX44 .
Automatic Transmission	Automatic Transaxle/Transmission - Section 307-01 of the Workshop Manual
Base Engine	Engine System - General Information, Section 303-00 of the Workshop Manual
Intake Air System	HU1
Continental, LS6/LS8, Windstar: A/C pressure sensor input to PCM	DS22
Additional Testing	Z1
Additional Checks: Drivelines Manual transmission/clutch Charging System Optional traction control system (Contour/Mystique/ Cougar) 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)	Applicable section in Workshop Manual.

Chart 2

Starting Concerns:

Hard Start/Long Crank
Erratic Start/Erratic Crank

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Battery Condition and Current Draw	Visual, Charging System - General Information Section 414-00 in the Workshop Manual.
Secondary Ignition System	JB1
Fuel Delivery System	For Natural Gas Applications: HB1 All Others: HC1
Exhaust System	HF1
PCV System	HG1
EVAP System	If symptom is "engine stalls"; HX19 . For other symptoms; HX44 .
Intake Air System	HU1
Starting System	Starting System, Section 303-06 in the Workshop Manual.
Contaminated MAF Sensor	Visual Check
F-150 Lightning and 5.4L/6.8L F-250HD/350/450 only: Check high speed fuel pump secondary circuits.	KA70
Additional Testing	Z1

Chart 3

Starting Concerns:

No Start, Normal Crank

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 (Section 5 Pinpoint Test unless noted)
Add-on Anti-Theft Devices	Visual, check with customer.
Fuel/Ignition	For 2.5L Contour/Mystique/Cougar w/o returnless fuel: KA75 . For LS6/LS8: KB85 . All others: A1 .
If engine is now a no start: If engine will start and run normally at part throttle, check Idle Air Control (IAC) System.	Engine will now start and run normally at part throttle: KE2
Exhaust System (restrictions)	HF1
Base Engine	Engine System - General Information Section 303-00 of the Workshop Manual.
Additional Testing	Z1

Chart 4

Unique Idle Concerns:

Slow Return To Idle

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Vacuum Leaks, Throttle Body	Visual
PCV System	HG1
Intake Air System (air leaks)	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 Workshop Manual.

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Base engine air leaks, including proper sealing of intake manifold and components attached to intake air (such as the EGR valve or IAC valve).	Visual, Engine System - General Information Section 303-00 of the Workshop Manual.
Verify engine operates at normal temperature.	Visual (refer to Symptom Index, or Engine Cooling, Section 303-03 of Workshop Manual to diagnose any cooling system concerns that are present).
Intake Air System (air leaks)	HU1
Additional Testing	Z1

Chart 6

Unique Idle Concerns:

Low/Slow Idle

Stalls/Quits

Deceleration

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
For A/T with Stalls/Quits on deceleration: Transmission	Automatic Transaxle/Transmission, Section 307-1 of the Workshop Manual (Diagnosis By Symptom: Torque Converter Concerns)
For Low idle with A/C on (F-250/350/ o/8500#, 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: KM10
Fuel Delivery System	Natural Gas Applications: HB1 All Others: HC1
Intake Air System	HU1
Base Engine	Engine System - General Information, Section 303-00.

Chart 7

Backfires

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Secondary Ignition	JB1
Fuel Delivery System	Natural Gas Applications: HB1 All Others: HC1
Base Engine	Engine System - General Information, Section 303-00 of the Workshop Manual.
Exhaust System	HF1
Additional Testing	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 linear 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 (Section 5 Pinpoint Test 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 4.0L SOHC, 4.6L E/F Series, 5.4L: IMTVF with both Key On Engine Off, and with transmission in PARK/NEUTRAL and engine rpm greater than 3000 rpm (PID should indicate NO in both situations).	DPFEGR PID value not within 0.15V of KOEO value: HE100 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 YES: HU65
Fuel Delivery System	Natural Gas Applications: HB1 All others: HC1
Secondary Ignition	JB1
Mass Air Flow (MAF) Sensor	DC25
Exhaust System	HF1
Base Engine	Engine System - General Information, Section 303-00 of the Workshop Manual
Automatic Transmission	Automatic Transaxle/Transmission, Section 307-01 of the Workshop Manual (Diagnosis by Symptom - Poor Performance)
Brake System (brake drag or binding)	Brake System - General Information, Section 206-00 of the Workshop Manual
Contour/Mystique/Cougar (w/o returnless fuel system), Mustang, 4.2L E-Series 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.
F-150 Lightning and 5.4L/6.8L F-250HD/350/450 only: Check high speed fuel pump secondary circuits	KA70
Additional Testing	Z1
Additional Checks: Customer driving habits IMRC linkage (if equipped) Clutch (M/T) Charging System	Visual. Appropriate Group of the Workshop Manual.

Chart 9

Spark Knock

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Verify engine operates at normal temperature	Visual (refer to Symptom Index or Engine Cooling Section 303-03 of the Workshop Manual, to diagnose any cooling system concerns that are present).
Mass Air Flow (MAF) Sensor	DC25
Base Engine	Engine System - General Information Section 303-00 of the Workshop Manual
Fuel Delivery System	For Natural Gas Applications: HB1 All Others: HC1
Secondary Ignition System	JB1
PCV System	HG1
Knock Sensor (if equipped)	DG15
Engine Oil Quality	Visual
Additional Testing	Z1

Chart 10

Poor Fuel Economy

Note: Since driving styles can have a significant influence on fuel economy, verify the concern before starting an in-depth diagnosis. Also, the following external factors could contribute to "poor fuel economy" conditions:

Stop/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 (Section 5 Pinpoint Test 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: HE100 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 Charging System - General Information Section 414-00 of the Workshop Manual. VPWR between 10.5 and 17.0 volts, but not within 0.5 of battery voltage: CHECK B(+) supply to power relay (or CCRM). CHECK VPWR circuit between PCM and power relay or CCRM. CHECK PWR GND circuits.
Verify engine operates at normal temperature	Visual (refer to Symptom Index, or Engine Cooling Section 303-03 of the Workshop Manual, to diagnose any cooling system concerns that are present).
Secondary Ignition System	JB1
Fuel System	For Natural Gas Applications: HB1 All Others: HC1
Exhaust System	HF1
Automatic Transmission	Automatic Transaxle/Transmission Section 307-01 of the Workshop Manual (Diagnosis by Symptom - Poor Performance)
PCV System	HG1
Additional Checks: Brake drag Base engine concerns Incorrect PCV valve Contaminated MAF sensor Intake air system	Appropriate section in Workshop Manual
Additional Testing	Z1

Chart 11

Emissions Compliance

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Emissions Related Systems	EM1

Chart 12

Warning Indicators:

MIL
TCIL
SIL
Temperature Warning Indicator Lamp
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 (Section 5 Pinpoint Test unless noted)
Verify fuel filler cap is properly tightened	Visual
Trucks with Power Takeoff (PTO) and MIL concern: PTO input to PCM	FB3
MIL always on when engine is running (no DTCs): MIL circuits	For Mustang, Town Car, Continental, LS6/LS8, Windstar, F-150/250LD, Expedition and Navigator: GO to Instrument Cluster, Section 413-01 of the Workshop Manual. All Others: NB1
TCIL always on when engine is running (no DTCs): TCIL circuits	TB6
MIL never on (including the bulb check when the engine is first started): MIL circuits	For Mustang, Town Car, Continental, LS6/LS8, Windstar, F-150/250 LD, Expedition and Navigator: GO to Instrument Cluster, Section 413-01 of the Workshop Manual. All others: NB2
TCIL never on: TCIL circuits	For Mustang, Continental, LS6/LS8 and Windstar: GO to Instrument Cluster, Section 413-01 of the Workshop Manual. All others: TB8
Temperature Warning Indicator Lamp concerns: Engine cooling system or lamp circuits	If engine is overheating: GO to Engine Cooling, Section 303-03 of the Workshop Manual. 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: DL40
SIL always on or off: SIL circuits	KL1
Fuel Cap Indicator Lamp always on or off: Check fuel cap indicator lamp circuits	Indicator lamp always on:HX88 Indicator lamp always off:HX89
Additional Testing	Z1

Chart 13

Automatic Transmission Concerns:

Upshift
Downshift
Engagement

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Transmission	Automatic Transaxle/Transmission Section 307-01 of the Workshop Manual
Additional Tests	Z1

Chart 14

Instrumentation:

Tachometer Inoperative
Speedometer/odometer Inoperative

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Tachometer Inoperative Applications with CTO circuit from PCM pin 48: CTO circuit from PCM	JH1
Speedometer/odometer Inoperative Applications with Manual Shift On Fly (MSOF) transfer case using Transfer Case Speed Sensor (TCSS)	DP30
Instrumentation	Instrument Cluster, Section 413-01 of the Workshop Manual

Chart 15

Oil System Concerns:

High Oil Consumption
Leaks

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
PCV System	HG1
Base Engine	Engine System - General Information Section 303-00 of the Workshop Manual
Additional Checks External leaks Proper dipstick Proper oil viscosity	Visual

Chart 16

Cooling System Concerns:

Electric Cooling Fan(s) Does Not Operate (Low and/or High Speed)

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Electric Cooling Fan Components	For Escort/Tracer and Mustang: X40 For LS6 and LS8: Engine Cooling, Section 303-03 of the Workshop Manual All Others: KF30
Cooling System	Engine Cooling, Section 303-03 of the Workshop Manual

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 (Section 5 Pinpoint Test unless noted)
Cooling fan circuits and ACPSW or ACP circuits	For Escort/Tracer and 4.6L Mustang: X80 For 3.8L Mustang: X82 For Continental and Windstar: KF63 For LS6 and LS8: Engine Cooling, Section 303-03 of the Workshop Manual All Others: KF60
Cooling System	Engine Cooling, Section 303-03 of the Workshop Manual

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 (Section 5 Pinpoint Test unless noted)
Base Engine	Engine System - General Information Section 303-00 of the Workshop Manual
Black Smoke: Fuel Delivery System	For Natural Gas Applications: HB1 All Others: HC1
Black Smoke: Ignition System	JB1
Blue Smoke: PCV System	HG1

Chart 19

Fuel System Concerns:

Odor, Engine Compartment

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Natural Gas Applications: Fuel Delivery System	HB16
EVAP System	For Taurus Flex Fuel: HX92 All Others: HX44
Fuel System	Visual (refer to Fuel Tank and Lines, section 310-01 of the Workshop Manual 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 Symptom Index (for noise such as spark knock) or applicable Section of Workshop Manual.

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Snap noise that may be due to secondary ignition arcing: Secondary Ignition System	For Coil On Plug Ignition Systems: Check condition of spark plug boots. All Others: JB1

Chart 21

Climate Control:

Lack of Cooling (A/C)/ A/C Not Functioning
A/C Always On
A/C Compressor Runs Continuously
A/C Does Not CUT-OFF Under WOT Conditions (Contour/Mystique/Cougar [ w/o returnless fuel system, Mustang, 4.2L E-Series only])

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Contour/Mystique/Cougar (w/o returnless fuel system), Mustang, 4.2L E-Series only: A/C electrical circuits	For lack of A/C cooling or A/C not functioning: X98 (Mustang) or KM8 (all others listed) For A/C always on: X140 (Mustang) or KM20 (all others listed) For A/C does not CUT-OFF under WOT conditions: X130 (Mustang) or KM26 (all others listed)
A/C System	If sent here from Workshop Manual with WACF PID displaying YES (fault indicated): Section 4, Powertrain Diagnostic Trouble Code (DTC) Charts and follow direction for KOEO DTC P1460. All others: Climate Control System, General Information section 412-00 of the Workshop Manual

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 (Section 5 Pinpoint Test 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	For Natural Gas Applications: HB1 All others: HC1
EVAP System	HX44
Fuel Source	Talk with customer. Since sulfur content can vary in different fuels, suggest trying a different fuel source.