GM OBD/OBD2 Codes >> GM 86-89 2.8L VIN S MFI

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86-89 2.8L VIN S MFI
13Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds during closed loop operation after the engine had been running for 2 minutes and the throttle angle was above 4%.
14Coolant temperature sensor signal indicates a temperature of over 275° F for 3 seconds.
15Coolant temperature sensor signal indicates a temperature colder than -47° F for 3 seconds.
21TPS voltage was above 2.5 volts for 5 seconds when the MAP sensor signal showed manifold vacuum above 15 pounds or TPS signal voltage was over 4.5 volts.
22TPS voltage was under 0.2 volts for 3 seconds when the engine was running.
23Manifold air temperature sensor signal showed an air temperature of -31° F for 3 seconds after the engine has been running for 8 minutes.
24When engine speed was between 1400 and 3600 RPM and throttle angle was less than 2%, the MAP sensor signal showed low voltage (High manifold vacuum) for at least 3 seconds.
25Manifold air temperature sensor signal showed an air temperature over 293° F for more than 3 seconds after the engine has been running for 4 minutes and a vehicle speed was present.
32EGR vacuum switch was closed during start-up or idle, or EGR vacuum switch did not close when EGR solenoid was commanded to close by ECM for 5 seconds.
33MAF sensor indicated air flow was more than 20 gm/sec for 2 seconds.
34MAF sensor signal showed air flow to be less than 2 gm/sec or the MAF circuit was shorted.
41The number of crank reference pulses did not match the number according to the PROM when engine speed was under 2000 RPM, or the incorrect PROM has been installed.
42The EST signal did not change when the ECM applied bypass voltage to the ignition module.
44Oxygen sensor voltage was under 0.2 volts for 60 seconds of closed loop operation.
45Oxygen sensor voltage was over 0.7 volts for 30 seconds in a closed loop when throttle angle was between 3% and 45% and engine had been running for at least 1 minute.
51PROM error.
52CALPAK error.
53Charging system voltage was greater than 17.1 volts for 2 seconds. Repair charging system.
54Fuel pump signal voltage was less than 2 volts for 1.5 seconds.
55ECM error. Replace ECM.
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