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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
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