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Retrieving Codes
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS (112 - 138)
Chapter 4 56
TEST
CODE CONDITION FAULT CODE DEFINITION
112 O, C (Trucks ONLY): Air charge temperature
sensor below minimum voltage
113 O, C Intake air charge temperature sensor above
maximum voltage / -40° indicated
114 O, R Air charge temperature sensor higher or
lower than expected voltage
116 O, R Engine coolant temperature higher or lower
than expected
117 O, C Engine coolant temperature sensor below
minimum voltage / 254° F indicated
118 O, C Engine coolant temperature sensor above
maximum voltage / 0 to -40° F indicated
121 O, R, C Closed throttle voltage higher or lower than
expected
122 O, C Throttle Position sensor below minimum
voltage
123 O, C Throttle Position sensor above maximum
voltage
124 C Throttle Position sensor voltage above
normal
125 C Throttle Position sensor voltage below
normal
126 O, R, C Manifold absolute pressure (MAP) or
barometric sensor (BARO) above or below
normal
126 C Cylinder identification circuit failure
128 R (Cars ONLY): Manifold absolute pressure
sensor failure/ vacuum hose disconnected or
damaged
128 C (Trucks ONLY): Manifold absolute
pressure sensor / vacuum hose disconnected
or damaged
129 R Insufficient Mass Air Flow (MAF) change
during dynamic response test
136 R HEGO (HO2S) sensor fault, always lean
137 R HEGO (HO2S) sensor fault, always rich
138 R Cold start injector flow insufficient
4
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