Equus 3123 - GM Code Reader (1982 - 1995) - Manual (Page 16)

2
2-7 GM
2.5.1 GM Engine/Electronic Transmission Service Codes; Saturn
Engine Service Codes
CODE SERVICE CODE DEFINITION
11 (Saturn vehicles ONLY): Indicates transmission service
codes will be displayed next on the "Shift to D2" light
(1991-92 models) or "Temperature" indicator light (1993
and later models)
12 Diagnostic mode; no distributor signal to Electronic
Control Module; System PASS
13 Oxygen sensor signal fault - signal too low / open left
oxygen sensor circuit (Dual sensor models)
14 Coolant sensor or circuit fault - signal voltage low or
shorted
15 Coolant temperature sensor or circuit fault - signal
voltage high
16 Battery or alternator problem - voltage too high or low
Direct ignition system (DIS) fault line open or shorted to
ground
Ignition system fault - loss of 2X or Low Resolution
Pulse signal
Transmission speed error
17 RPM signal problem
Camshaft sensor - circuit problems
Electronic Control Module (ECM) computer circuit
problem - Pull-up resistor (Saturn)
18 Camshaft or Crankshaft sensor - circuit problems
Fuel Injector circuit is not working properly - possible
blown fuel injector fuse
19 Ignition system fault - Intermittent 7X signal or loss of
58X signal or 6X signal (Saturn)
21 Throttle position sensor (TPS) - signal voltage is high
22 Throttle position sensor (TPS) - signal voltage is low
Fuel cutoff relay circuit - open or shorted to ground
23 Manifold air temperature (MAT) sensor - signal voltage
is low or high
Throttle position sensor (TPS) error
Mixture Control (M/C) solenoid - open or short circuit
problems
Intake Air Temperature Sensor (IAT) low