EEC IV Diagnostic Routines;

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 9

Symptom​	OASIS Number​
Stalls/Quits​	607000​
—Acceleration​	607500​
—Cruise​	607600​
Runs Rough​	608000​
—Acceleration​	608500​
—Cruise​	608600​
Misses​	609000​
—Acceleration​	609500​
—Cruise​	609600​
Buck/****​	610000​
—Acceleration​	610500​
—Cruise​	610600​
—Deceleration​	610700​
Hesitation/Stumble​	611000​
—Acceleration​	611500​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 15

Symptom​	OASIS Number​
Poor Fuel Economy​	622000​

Note: Since driving habits 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 City Driving
• Tire Pressure/Size
• Vehicle Loads (Trailer Towing, etc.)
• Extended Winter Warm-up Conditions
• High Speed Driving
• Axle Ratio
• Speedometer Gear Ratio
• Road/Weather Conditions
• After Market Add-ons
• Short-Run Operations
• Customer Expectations/Driving Habits

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 16

Symptom​	OASIS Number​
Emissions Compliance​	623000​

Note: Canada and some states or metropolitan areas in the United States require periodic Idle Emission Tests. All Ford products have been designed to pass these tests. If a Ford product fails an Idle Emission Test, it is probable that 1) the engine temperature was not warm and stabilized before the test, or 2) the vehicle had idled excessively before the test.

Before to starting any service, complaints of Idle Emission Test failure should be verified.

The following example contains most of the emissions measurement modes of the current state inspection/maintenance test procedures:

1. Ensure that the engine is at normal operating temperature and that all accessories are turned off.

1. Read emissions at idle.

1. Run engine at 2500 ± 300 rpm.

1. Read emissions within 30 seconds.

1. Return engine speed to idle.

1. Read emissions within 30 seconds.

If any emission components are replaced, perform the following before repeating the State Emission Test procedure:

1. Clear Keep Alive Memory (KAM)—Refer to EEC-IV Quick Test Appendix (Section 5A).

1. To relearn appropriate Adaptive Learning, run engine at 2500 rpm for one minute and idle engine for two minutes.

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 18

Symptom​	OASIS Number​
Automatic Transmission Shift Concerns​	​
—Upshift​	501000​
—Downshift​	502000​
—Engagement​	503000​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 18

Symptom​	OASIS Number​
Automatic Transmission Shift Concerns​	​
—Upshift​	501000​
—Downshift​	502000​
—Engagement​	503000​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 21

Symptom​	OASIS Number​
Cooling System Concerns​	402000​
—Overheating​	402300​
IF EQUIPPED—Electric cooling fan does not operate (high and/or low speed)​	​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 22

Symptom​	OASIS Number​
Cooling System Concerns —Runs Cold​	402000​
—Electric cooling fan always runs​	​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 23

Symptom​	OASIS Number​
Exhaust System Concerns​	403000​
—Smoke​	403400​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 24

Symptom​	OASIS Number​
Fuel System Concerns​	404000​
—Odor, Engine Compartment​	404201​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 25

Symptom​	OASIS Number​
Engine Noise (Under Hood)​	497000​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 26

Symptom​	OASIS Number​
Vibration Concerns​	703000​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 29

Symptom​	OASIS Number​
Climate Control​	208000​
—Lack of Cooling (A/C) (A/C not functioning)​	208200​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 30

Symptom​	OASIS Number​
Climate Control​	208000​
—A/C Always On​	​
—A/C Compressor Runs Continuously​	​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 31

Symptom​	OASIS Number​
Climate Control​	208000​
—A/C Does Not CUT-OFF Under WOT Conditions (applications with WAC circuitry)​	​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 33

Symptom​	OASIS Number​
Lighting Systems—Exterior Lighting​	201000​
—Stoplamps Always On​	201228​
—Stoplamps Always Off​	​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 34

Symptom​	OASIS Number​
Exhaust System Concerns​	403000​
—Odor (Sulphur/"Rotten Egg" Smell)​	403596​

Note: A slight sulphur smell may be normal. Catalysts with less than 5-10 thousand miles (new vehicle or replaced catalyst) are more likely to have a sulphur smell concern due to the highly active state of new catalysts. If no problem is found, replacing the catalyst may actually make the symptom worse.

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 1

Symptom​	OASIS Number​
Starting Concerns​	—​
—No Crank​	601300​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 2

Symptom​	OASIS Number​
Starting Concerns​	​
—Hard Start/Long Crank —Erratic Start/Erratic Crank​	602300​

Note: It is good practice to confirm that the correct starting procedure was used by the customer before proceeding with diagnosis.

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 3

Symptom​	OASIS Number​
Starting Concerns​	​
—Stalls After Start​	​
Stalls/Quits​	607000​
—Idle​	607400​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 4

Symptom​	OASIS Number​
Starting Concerns​	​
—No Start/Normal Crank​	603300​

Note: Extended cranking because of a "No Start" can load the exhaust system with raw fuel, damaging the catalytic converter after the engine starts. After the "No Start" condition has been repaired, disconnect the secondary air supply, run the engine until surplus fuel is used up, and reconnect the secondary air supply.