1991 FORD FESTIVA sensor

EBL
Electronic Back Light
ECM
Engine Control Module
ECT
Engine Coolant Temperature Sensor
EDIS
Electronic Distributorless Ignition System
EEC
Electronic Engine Control
EECS
Evaporative Emission Control System
EEPROM
Electronically Erasable PROM
EFE
Early Fuel Evaporation
EGO
Exhaust Gas Oxygen Sensor
EGR
Exhaust Gas Recirculation
ESA
Electronic Spark Advance
ESC
Electronic Spark Control
EST
Electronic Spark Timing
EVAP
Fuel Evaporative System
EVIC
Electronic Vehicle Information Center
EVP
EGR Valve Position Sensor
Exc.
Except
"F"
° F
Fahrenheit (Degrees)
F/B
Fuse Block
Fed.
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Federal
FI
Fuel Injection
FICU
Fuel Injection Control Unit
FIPL
Fuel Injector Pump Lever
FPR-VSV
Fuel Pressure Regulator Vacuum Switching Valve
Ft. Lbs.
Foot Pounds
FWD
Front Wheel Drive
"G"
g
gr a ms
Gals.
ga l l o n s
GND or GRND
Ground
"H"
HAC
High Altitude Compensation
HC
Hydrocarbons
H/D
Heavy Duty
HO2S
Heated Exhaust Gas Oxygen Sensor
Hg
Mercury
Hgt.
Height
HLDT
Headlight
HO
High Output
HO2S
Heated Oxygen Sensor
HP
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"J"
J/B
Junction Block
"K"
KAPWR
Keep Alive Power
k/ohms
kilo-ohms (1000 ohms)
kg
Kilograms (weight)
kg/cm
2
Kilograms Per Square Centimeter
KM/H
Kilometers Per Hour
KOEO
Key On, Engine Off
KOER
Ke y On , E n gin e R u n n in g
KS
Knock Sensor
kW
Kilowatt
kV
Kilovolt
"L"
L
Liter
lbs. (Lbs. when used in table)
Pounds
LCD
Liquid Crystal Display
L/D
Light Duty
LDP
Leak Detection Pump (Part of EVAP system.)
LED
Light Emitting Diode
LH
Left Hand
"M"
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mA
Milliamps
MA or MAF
Mass Airflow
MAFS
Mass Airflow Sensor
MAP
Manifold Absolute Pressure
MAT
Manifold Air Temperature
Mem.
Memory
MEM-CAL
Memory Calibration Chip
mfd.
Microfarads
MFI
Multiport Fuel Injection
MIL
Malfunction Indicator Light
MPI
Multi-Point (Fuel) Injection
mm
Millimeters
MPH
Miles Per Hour
mV
Millivolts
"N"
NA
Not Available
NGS
New Generation Star
N.m
Newton Meter
No.
Number
Nos.
Numbers
NOx
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SBC
Single Bed Converter
SBEC
Single Board Engine Controller
SES
Service Engine Soon
SFI
Sequential (Port) Fuel Injection
SIL
Shift Indicator Light
SIR
Supplemental Inflatable Restraint
SOHC
Single Overhead Cam
SOL or Sol.
Solenoid
SPFI
Sequential Port Fuel Injection
SPK
Spark Control
SPOUT
Spark Output
SRI
Service Reminder Indicator
SRS
Supplemental Restraint System (Air Bag)
STAR
Self-Test Automatic Readout
STO
Self-Test Output
SUB-O
2
Sub Oxygen Sensor
Sw.
Switch
Sys.
System
"T"
TAB
Thermactor Air By-Pass
TAC
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Throttle Actuator Module
TAD
Thermactor Air Diverter
TBC
Body Control Module
TBI
Throttle Body Injection
TCC
Torque Converter Clutch
TDC
Top Dead Center
Temp.
Temperature
TFI
Thick Film Ignition
THERMAC
Thermostatic Air Cleaner
TPM
Tire Pressure Monitor
TPMS
Tire Pressure Monitor System
TPS
Throttle Position Sensor/Switch
TS
Temperature Sensor
TV
Thermovalve
TWC
Three-Way Catalyst
"V"
V
Valve
Vac.
Vacuum
VAF
Vane Airflow
VAPS
Variable Assist Power Steering
VCC
Viscous Converter Clutch
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VCRM
Variable Control Relay Module
VIN
Vehicle Identification Number
VM
Vacuum Modulator
Volt.
Voltage
VOM
Volt-Ohmmeter (Analog)
VRV
Vacuum Regulator Valve
VSS
Vehicle Speed Sensor
VSV
Vacuum Switching Valve
"W"
W/
With
W/O
Without
WAC
Wide Open Throttle A/C Switch
WOT
Wide Open Throttle
Copyr ight 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.
Article GUID: A00002370
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IGNITION SYSTEM TROUBLE SHOOTING
Open coolant temperature sensor circuitTest sensor and wiring
Shorted W.O.T. switch in T.P.S.Disconnect W.O.T. switch,
engine should start
Defective ECMReplace ECM
Fuel tank residual pressure valve leaksTest for fuel pressure drop
after shut down
Hard Starting
Disconnected hot air tube to air cleanerReconnect tube and test
control valve
Defective Idle Air Control (IAC) valveTest valve operation and
circuit
Shorted, open or misadjusted T.P.S.Test and adjust or replace
T.P.S.
EGR valve openTest EGR valve and control
circuit
Poor Oxygen sensor signalTest for shorted or circuit
Incorrect mixture from PCV systemTest PCV for flow, check
sealing of oil filter cap
Poor High Speed Operation
Low fuel pump volumeFaulty pump or restricted fuel
lines or filters
Poor MAP sensor signalTest MAP sensor, vacuum
hose and wiring
Poor Oxygen sensor signalTest for shorted or open
sensor or circuit
Open coolant temperature sensor circuitTest sensor and wiring
Faulty ignition operationCheck wires for cracks or poor
con- nections, test secondary
voltage with oscilloscope
Contaminated fuelTest fuel for water or alcohol
Intermittent ECM groundTest ECM ground connection
for resistance
Restricted air cleanerReplace air cleaner
Restricted exhaust systemTest for exhaust manifold back
pressure
Poor MAF sensor signalCheck leakage between sensor
and manifold
Poor VSS signalIf tester for ALCL hook-up is
available check that VSS
reading matches speedometer
Ping or Knock on Acceleration
Poor Knock sensor signalTest for shorted or open
sensor or circuit
Poor Baro sensor signalTest for shorted or open
sensor or circuit
Improper ignition timingSee VEHICLE EMISSION
CONTROL LABEL (where
applicable)
Check for engine overheating problemsLow coolant, loose belts or
electric cooling fan inoperative
NOTE:For additional electronic fuel injection trouble shooting inform ation, see the appropriate article in the
ENGINE PERFORMANCE section (not all vehicles have Com puter Engine Control articles). Inform ation
is provided there for diagnosing fuel system problem s on vehicles with electronic fuel injection.
NOTE:This is GENERAL inform ation. This article is not intended to be specific to any unique situation or
individual vehicle configuration. T he purpose of this T rouble Shooting inform ation is to provide a list
of com m on causes to problem sym ptom s. For m odel-specific T rouble Shooting, refer to SUBJECT ,
DIAGNOST IC, or T EST ING articles available in the section(s) you are accessing.
Page 17 of 36 MITCHELL 1 ARTICLE - GENERAL INFORMATION Trouble Shooting - Basic Procedures
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