Retrieving codes – Equus 3145 - Digital Ford Code Reader (1981 - 1995) User Manual
Page 60
Retrieving Codes
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS (139 - 181)
57
Chapter 4
TEST
CODE
CONDITION
FAULT CODE DEFINITION
139
C
(Cars ONLY): HEGO (HO2S) sensor switch
fault
141
R
Flexible fuel control / fuel system lean
144
C
HEGO (HO2S) sensor switch fault
157
C
Mass Air Flow sensor fault, low voltage
158
O, C
Mass Air Flow sensor fault, high voltage
159
O, R
Mass Air Flow sensor fault, above or below
normal
167
R
Throttle Position sensor fault during
dynamic response test
171
C
(Cars ONLY): HEGO (HO2S) sensor
fault/not switching, or fuel system at
adaptive limits
171
C
(Trucks ONLY): HEGO (HO2S) sensor
fault/not switching
172
R, C
HEGO (HO2S) sensor fault/lean
173
R, C
HEGO (HO2S) sensor fault/rich
174
C
(Cars ONLY): HEGO switching time slow
175
C
(Cars ONLY): HEGO (HO2S) sensor
fault/not switching, or fuel system at
adaptive limits
175
C
(Trucks ONLY): HEGO (HO2S) sensor
fault/not switching
176
C
HEGO (HO2S) sensor fault/always lean
176
R*
Insufficient TP change during no oxygen
sensor switch detected
177
C
HEGO (HO2S) sensor fault/always rich
177
*
No oxygen sensor switch detected
178
C
(Cars ONLY): HEGO switching time slow
179
C
(Cars ONLY): Fuel system at lean adaptive
limit at partial throttle / system rich
179
C
(Trucks ONLY): HEGO (HO2S) sensor
fault unable to switch / rich during part
throttle
181
C
(Cars ONLY): Fuel system at rich adaptive
limit at partial throttle / system lean
4