EEC IV Diagnostic Routines;

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 5

Symptom​	OASIS Number​
Unique Idle Concerns​	​
—Slow Return to Idle​	617400​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 6

Symptom​	OASIS Number​
Unique Idle Concerns​	​
—Rolling Idle​	618400​
Runs Rough​	608000​
—Idle​	608400​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 7

Symptom​	OASIS Number​
Unique Idle Concerns​	​
—Fast Idle​	619400​
Additional Driveability Concerns​	​
—Diesels/Runs On​	621000​

Note: If the vehicle runs normally after the ignition key is turned off, check for faulty ignition switch, IGN RUN circuit short to power, etc. Refer to Service Manual.

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 8

Symptom​	OASIS Number​
Unique Idle Concerns​	​
—Low Idle​	​
Stalls/Quits​	607000​
—Deceleration​	607700​

 

[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 11

Symptom​	OASIS Number​
Surge​	612000​
—Acceleration​	612500​
—Cruise​	612600​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 12

Symptom​	OASIS Number​
Backfires​	613000​
—Idle​	613400​
—Acceleration​	613500​
—Deceleration​	613600​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 13

Symptom​	OASIS Number​
Lack/Loss of Power​	614000​
—Acceleration​	614500​
—Cruise​	614600​

Note: Verify symptom is reported under normal driving conditions without engine/vehicle excessive load conditions.

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 14

Symptom​	OASIS Number​
Spark Knock​	615000​
—Acceleration​	615500​
—Cruise​	615600​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Index
Gasoline Engines

Driveability​	​	OASIS Number​	Chart Number​
Starting​	No Crank​	601300​	1​
Concerns​	Hard Start/Long Crank/Erratic Start/Erratic Crank​	602300​	2​
​	Stall After Start​	—​	3​
​	No Start/Normal Crank​	603300​	4​
Unique​	Slow Return to Idle​	617400​	5​
Idle​	Rolling Idle​	618400​	6​
Concerns​	Fast Idle​	619400​	7​
​	Low/Slow Idle​	—​	8​
Driveability — Performance While Driving Concerns​
Stalls/Quits​	Idle​	607400​	3​
(607000)​	Acceleration​	607500​	9​
​	Cruise​	607600​	9​
​	Deceleration​	607700​	8​
Runs Rough​	Idle​	608400​	6​
(608000)​	Acceleration​	608500​	9​
​	Cruise​	608600​	9​
Misses​	Idle​	609500​	6​
(609000)​	Acceleration​	609500​	9​
​	Cruise​	609600​	9​
Buck/****​	Acceleration​	610500​	9​
(610000)​	Cruise​	610600​	9​
​	Deceleration​	610700​	9​
Hesitation/Stumble (611000)​	Acceleration​	611500​	9​
Surge​	Acceleration​	612500​	11​
(612000)​	Cruise​	612600​	11​
Backfires​	Idle​	613400​	12​
(613000)​	Acceleration​	613500​	12​
​	Deceleration​	613600​	12​
Lack/Loss of Power​	Acceleration​	614500​	13​
(614000)​	Cruise​	614600​	13​
Spark Knock​	Acceleration​	615500​	14​
(615000)​	Cruise​	615600​	14​
Additional Driveability Concerns​
Diesels/ Runs On​	​	621000​	7​
Poor Fuel Economy​	​	622000​	15​
Emissions Compliance​	​	623000​	16​
Malfunction Indicator Light (MIL) Concern DCL Message Received (Continental Only)​	698298 698198​	17​
Electrical​		H
Warning Indicators​	​	​	​
—MIL​	​	206000​	17​
—DCL (Continental Only)​	​	698298​	​
—TCIL, 4x4 Low, SIL​	​	698198​	​
Climate Control​	Lack of cooling (AC) (AC not functioning)​	208200​	29​
(208000)​	AC always ON/AC compressor runs continuously​	—​	30​
​	A/C does not cut off under WOT conditions. (Applications with WAC circuitry)​	—​	31​
​

 

[miesk5]

Instrumentation —Tachometer Inoperative​	​	204000 204128 204228​	19​
Lighting Systems-Exterior Lighting​	​	201000​	​
—Stoplamps always on​	​	201228​	​
—Stoplamps always off​	​	—​	33​
Driveline​
Manual Transmission Concern​	​	​	​
—Shift Indicator Lamp​	​	505698​	17​
Automatic Transmission Shift Concerns​	​	​	​
—A/T upshift concern​	​	501000​	​
—A/T downshift concern​	​	502000​	18​
—Engagement concern​	​	503000​	​
Engine​
Oil System Concerns​	​	401000​	​
—High Oil Consumption​	​	401100​	20​
—Leaks​	​	401800​	​
Cooling​	Overheating​	402300​	21​
System​	Runs Cold​	—​	22​
Concerns​	Electric cooling fan never runs​	—​	21​
(402000)​	Electric cooling fan always runs​	—​	22​
Exhaust System Concerns​	Visible Smoke​	403400​	23​
(403000)​	Odor (Sulphur/"rotten egg" smell)​	403596​	34​
Fuel System Concerns (404000)​	​	404201​	24​
—Odor, Engine Compartment​	​	​	​
Engine Noise (Under Hood)​	​	497000​	25​
Governor will not Limit rpm (7.0L MFI)​	—​	27​
Noise/Vibration​
Vibration Concerns​	​	703000​	26​
No Symptoms Present​
EEC-IV Quick Test​	​	—​	32​
DIESEL ENGINES​
All driveability symptoms​	​	—​	28​

 

[miesk5]

1994 PCED OBDI-A

SECTION 2A: Diagnostic Routines​

Diagnostic Routines Symptom Flow Charts — Chart 13

Symptom​	OASIS Number​
Lack/Loss of Power​	614000​
—Acceleration​	614500​
—Cruise​	614600​

Note: Verify symptom is reported under normal driving conditions without engine/vehicle excessive load conditions.