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81-90 5.0L VIN Y
13 Oxygen 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%.
14 Coolant temperature sensor signal indicates a temperature of over 275° F for 2 seconds.
15 Coolant temperature sensor signal indicates a temperature colder than -27° F for 30 seconds after the engine has been running for at least 30 seconds.
21 TPS voltage was above 2.5 volts for 8 seconds when the MAP sensor signal showed manifold vacuum to be 15 pounds or more.
22 TPS voltage was under 0.2 volts for 2 seconds when the engine was running.
23 Inlet air temperature sensor signal showed an air temperature below -22° F after the engine has been running for 5 minutes.
24 When engine speed was between 1200 and 4400 RPM and throttle position angle was less than 2%, the MAP signal showed low voltage (high manifold vacuum) for at least 5 seconds.
25 Inlet air temperature sensor signal showed an air temperature over 302° F after the engine has been running for 5 minutes.
32 EGR open command did not change MAP sensor signal. Normal EGR flow should cause slight decrease in manifold vacuum which would change MAP sensor signal.
33 MAP sensor signal voltage was too high (low vacuum) for 5 seconds when throttle opening was under 4%.
34 MAP sensor signal voltage was too low (high vacuum) when engine speed was under 1200 RPM or the engine speed was over 1200 RPM with a throttle position angle above 21%.
42 The EST signal did not change when the ECM applied bypass voltage to the ignition module.
43 The 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.
44 Oxygen sensor voltage was under 0.2 volts for 50 seconds of closed loop operation.
45 Oxygen sensor voltage was over 0.7 volts for 30 seconds of closed loop operation with a throttle angle between 2% and 20%.
51 PROM error.
52 CALPAK error.
54 Fuel pump voltage was not present at fuel pump sense line for 2 seconds after the ECM has sent the fuel pump on command.
55 ECM error. Replace ECM.
13 Oxygen 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%.
14 Coolant temperature sensor signal indicates a temperature of over 275° F for 2 seconds.
15 Coolant temperature sensor signal indicates a temperature colder than -27° F for 30 seconds after the engine has been running for at least 30 seconds.
21 TPS voltage was above 2.5 volts for 8 seconds when the MAP sensor signal showed manifold vacuum to be 15 pounds or more.
22 TPS voltage was under 0.2 volts for 2 seconds when the engine was running.
23 Inlet air temperature sensor signal showed an air temperature below -22° F after the engine has been running for 5 minutes.
24 When engine speed was between 1200 and 4400 RPM and throttle position angle was less than 2%, the MAP signal showed low voltage (high manifold vacuum) for at least 5 seconds.
25 Inlet air temperature sensor signal showed an air temperature over 302° F after the engine has been running for 5 minutes.
32 EGR open command did not change MAP sensor signal. Normal EGR flow should cause slight decrease in manifold vacuum which would change MAP sensor signal.
33 MAP sensor signal voltage was too high (low vacuum) for 5 seconds when throttle opening was under 4%.
34 MAP sensor signal voltage was too low (high vacuum) when engine speed was under 1200 RPM or the engine speed was over 1200 RPM with a throttle position angle above 21%.
42 The EST signal did not change when the ECM applied bypass voltage to the ignition module.
43 The 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.
44 Oxygen sensor voltage was under 0.2 volts for 50 seconds of closed loop operation.
45 Oxygen sensor voltage was over 0.7 volts for 30 seconds of closed loop operation with a throttle angle between 2% and 20%.
51 PROM error.
52 CALPAK error.
54 Fuel pump voltage was not present at fuel pump sense line for 2 seconds after the ECM has sent the fuel pump on command.
55 ECM error. Replace ECM.