GM OBD/OBD2 Codes >> GM 86-89 5.0L VIN F

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86-89 5.0L VIN F
13Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds. Engine was at normal operating temperature and had been running for at least 2 minutes after start with a throttle angle above 5%.
14Coolant temperature sensor signal indicates a temperature of over 266° F for 3 seconds.
15Coolant temperature sensor signal indicates a temperature colder than -38° F for 3 seconds.
21TPS voltage was above 2.5 volts for 3 seconds when the MAP sensor signal showed manifold vacuum to be 15 pounds or more, or TPS was above 4.8 volts at anytime.
22TPS voltage was under 0.2 volts for 2 seconds when the engine was running.
23Manifold air temperature sensor signal showed an air temperature below -22° F after the engine has been running for 5 minutes.
24When engine speed was between 1400 and 3600 RPM and throttle position angle was less than 2% for at least 4 seconds.
25Manifold air temperature sensor signal showed an air temperature over 302° F for 2 seconds after the engine has been running for 2 minutes and vehicle speed was greater than 5 MPH.
32EGR open command did not change the fuel mixture when the command was given during off idle operation. EGR opening should cause the mixture to be slightly richer because of the low oxygen content of exhaust gas.
33MAF sensor indicated an air flow of 45 gm/sec or more for 1 second when TPS was less than 1/4 throttle and engine speed was under 2000 RPM.
34MAF sensor indicated an air flow of 25 gm/sec or less for 1 second when TPS was above 6% and engine speed was above 2300 RPM.
41Faulty or incorrect MEM-CAL.
42The EST signal did not change when the ECM applied bypass voltage to the ignition module.
43The ECM did not detect a knock signal during near wide open throttle operation with coolant temperature above 194° F or the knock signal was present for 5 seconds or more during normal engine operation.
44Oxygen sensor voltage was under 0.2 volts for 50 seconds of closed loop operation.
45Oxygen sensor voltage was over 0.7 volts for 50 seconds with a throttle angle above 2%.
51MEM-CAL error.
52CALPAK error.
53ECM sees a battery voltage of more than 17.1 volts for 2 seconds.
54Fuel pump voltage was less than 2 volts for 1.5 seconds since the last reference pulse was received.
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