27
136
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal not switching
during Engine Run Self-
Test. Indicates “lean” (Bank
#2).
137
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal not switching
during Engine Run Self-
Test. Indicates “rich” (Bank
#2).
138
Cold Start Injector (CSI) –
insufficient flow during
Engine Run Self-Test.
139
Exhaust Gas Oxygen
(EGO) sensor – no
switching detected (Bank
#2).
141
Fuel system indicates
“lean” with high flow
demand.
144
Exhaust Gas Oxygen
(EGO) sensor – no
switching detected (Bank
#1).
157
Mass Air Flow (MAF)
sensor – signal voltage is
too low
158
Mass Air Flow (MAF)
sensor – signal voltage is
too high
159
Mass Air Flow (MAF)
sensor – signal voltage is
higher or lower than
expected.
165
“Downstream” Heated
Exhaust Gas Oxygen
(HEGO) sensor – voltage
signal indicates “lean”
(Bank #1).
166
“Downstream” Heated
Exhaust Gas Oxygen
(HEGO) sensor – voltage
signal indicates “rich”
(Bank #1).
167
Throttle Position (TP)
sensor – insufficient signal
voltage change during
Dynamic Response test
(Engine Run Self-Test).
168
“Downstream” Heated
Exhaust Gas Oxygen
(HEGO) sensor – signal
voltage too high.
169
“Downstream” Heated
Exhaust Gas Oxygen
(HEGO) sensor – signal
voltage too low.
171
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal not switching
(Bank #1).
172
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal indicates
“lean” (Bank #1).
173
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal indicates
“rich” (Bank #1).
175
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal not switching
(Bank #2).
176
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal indicates
“lean” (Bank #2).
177
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal indicates
“rich” (Bank #2).
179
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal not
switching: indicates “rich”
during part throttle engine
operation (Bank #1).
181
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal not
switching: indicates “lean”
during part throttle engine
operation (Bank #1).
182
Electronic Control
Assembly (ECA) status –
adaptive “rich” limit reached
in fuel control program
(engine idle, Bank #1).
183
Electronic Control
Assembly (ECA) status –
adaptive “lean” limit
reached in fuel control
program (engine idle, Bank
#1).
184
Mass Air Flow (MAF)
sensor – signal voltage is
higher than expected.
185
Mass Air Flow (MAF)
sensor – signal voltage is
lower than expected.
186
Injector pulsewidth higher
than expected or Mass Air
Flow (MAF) sensor signal
voltage is lower than
expected.
187
Injector pulsewidth lower
than expected or Mass Air
Flow (MAF) sensor signal
voltage is higher than
expected.
188
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal not
switching: indicates “rich”
during part throttle engine
operation (Bank #2).
189
Heated Exhaust Gas
Oxygen (HEGO) sensor –
voltage signal not
switching: indicates “lean”
during part throttle engine
operation (Bank #2).
191
Electronic Control
Assembly (ECA) status –
adaptive “rich” limit reached
in fuel control program
(engine idle, Bank #2).
192
Electronic Control
Assembly (ECA) status –
adaptive “lean” limit
reached in fuel control
program (engine idle, Bank
#2).
193
Flexible Fuel Sensor –
circuit failure.
211
Profile Ignition Pick-Up
(PIP) sensor – circuit
failure.
212
Loss of Ignition Diagnostic
Monitor (IDM) signal –
short
to ground in Spark Output
(SPOUT) circuit.
213
Spark Output (SPOUT)
circuit – open connection
failure.
214
Cylinder Identification (CID)
sensor – circuit failure.
215
Ignition system (distributor-
less) problem – Coil #1
primary side circuit failure.
