I got to thinking after I got a MAF code 34 for something that had nothing to do with it that it would be nice to know what it is that causes the ECU to throw codes..Like, ECU throws blah blah code when blah blah sensor has blah blah voltage for blah blah amount of time.
Has anyone made a table or chart like this? Its kinda bothersome to not know whats really wrong when you get a certain code for something. I'd think knowing what causes the code would help more than a generalization that the codes give you.

 

Here is a list of trouble codes and possible causes. As far as knowing what each sensor does, manual will help you with that some or you can search and read here. Hope this is what you wanted.

TROUBLE CODES
12. No reference pulses to Electronic Control Module (ECM).
13. Oxygen sensor signal stays lean during warm engine cruise
14. High temperature indicated at engine coolant temp. sensor
15. Low temperature indicated at engine coolant temp. sensor
16. High battery voltage OR
Direct inition system open or shorted to ground
17. RPM signal problem
18-20. N/A
21. High voltage at throttle positon sensor
22. Low voltage at throttle positon sensor OR
Fuel cutoff relay circuit open or shorted to ground
23. Low temperature at manifold air temperature sensor OR
Throttle position sensor error
24. Circuit fault in vehicle speed sensor
25. High temperature at manifold air temperature sensor OR
Vacuum switching valve circuit open or shorted to ground OR
High voltage at ATS sensor
26. Fault in quad driver module
27. Fault in 2nd gear switch
28. Fault in 3rd gear switch
29. Fault in 4th gear switch
30. N/A
31. Low voltage at manifold absolute pressure sensor OR
Fuel injector OR
Park or neutral switch OR
CAM diagnostic OR
Governor malfunction OR
Wastegate overboost OR
Wastegate eletrical signal open or shorted to ground
32. Fault in barometric pressure sensor circuit OR
Fault in exhaust gas recirculation valve diagnostic switch OR
Fault in electronic vacuum regulator valve
33. High voltage (low vacuum) at mass air flow sensor (or MAP sensor)
34. Low voltage (high vacuum) at mass air flow sensor (or MAP sensor)
35. Idle speed can not be set to desired RPM
36. Burn off at mass air flow sensor OR
Problem in transmission shift OR
Fault in direct ignition system OR
Missing pulses in electronic spark timing signal
37. N/A
38. Fault in torque converter clutch brake switch
39. Fault in torque converter clutch circuit
40. N/A
41. Fault at cam sensor OR
Cylinder select error OR
Tach input error
42. Fault at electronic spark timing circuit OR
Fault at direct ignition system OR
Fault at fuel cutoff relay circuit
43. Low voltage at electronic spark timing circuit
44. Oxygen sensor lean
45. Oxygen sensor rich
46. Fault at vehicle anti-theft sytem OR
Fault at power steering switch
47. Problem at Electronic Control Module (ECM)
48. Misfire
49. Vacuum leak
50. N/A
51. PROM error
52. Problem at Electronic Control Module (ECM) -
Missing fuel calpac missing OR
Analog to digital converter error OR
Fault at quad driver module OR
Low voltage at oil temperature sensor
53. High voltage at battery OR
High voltage at exhaust gas recirculation valve OR
Voltage reference error OR
Problem at vehicle anti-theft system
54. Low voltage at fuel pump OR
Low voltage at Fuel pump relay OR
Output failure at quad driver module
55. Problem at Electronic Control Module (ECM) -
ECM failure OR
Serial bus error OR
Fuel lean malfunction
56. Low coolant or corrosivity OR
Fault in port throttle system vacuum sensor
57. N/A
58. Problem at vehicle anti-theft system
59-60. N/A
61. Oxygen sensor degraded OR
Port throttle system error OR
Cruise control problems
62. Gear switch input diagnostics OR
High voltage at oil temperature sensor OR
Fault in cruise control- vacuum solenoid circuit
63. High voltage at manifold absolute pressure sensor OR
Fault in exhaust gas recirculation valve OR
Fault at right oxygen sensor
64. Low voltage at manifold absolute pressure sensor OR
Fault in exhaust gas recirculation valve OR
Right oxygen sensor lean
65. Failure at exhaust gas recirculation valve OR
Faulure at injector peak/hold diagnostic OR
Right oxygen sensor rich OR
Fault at cruise control position sensor
66. Internal reset of Electronic Control Module (ECM)
67. Fault at cruise control switch
68. Fault at cruise control switch
69. Fault at air conditioner pressure switch
70-87. N/A
88. Internal reset of Electronic Control Module (ECM

 

That is a nice list there however it should be a separate list for carburated and non-carburated cars since some of the codes have a different meaning. There should also be a trouble code list for the SIR system.

 

Yes, but the orginal post was from someone with a 305 TPI, this list should do just fine for the most part, and yes you have to read between the lines some and use it as a guide to help isolate the trouble. Best I have, so far it has helped me solve all of my issues to date anyway.

 

I agree with the carb list thought and everything, but this is what I need. However, I do know people that would benifit from other lists as well. Where did you get this info, exactly? Is there a source?
And thank you, too.

 

Right here on this site! Might want to browse around some besides in forums, there is a wealth of knowledge to be gained within the walls of Third Gen.Org.

https://www.thirdgen.org/faq/thirdgen.shtml#misc

:hail: :hail: :hail: :hail: :hail:

 

In your specific case, the ECM will generate and store an error code if the MAF reports an airflow that is below (or above) the calculated allowable airflow at a given RPM and TPS. If the out-of-range condition exists for 600mS of more, the error code will set. The MAF upper allowable range is determined by a programmed constant in the CALPAK, and is factored by the TPS input and engine RPM as reported by the distributor reference pulse input. The lower values are determined by the MAF tables programmed into the CALPAK PROM. The actual allowable value in volts (therefore G/S) is constantly varying as a result of these calculations.

600mS is not very long, and once the error code is set, the ECM will enter Backup Fuel Mode and not normally try to reset until the engine is shut off and restarted.

 

lol, I see. I was wondering why that looked familiar. Thanks.

And muchas gracias, Vader. That was more along the lines of what I was looking for. I was trying to get a list that I could look at and be able to consider all the things that could produce that code. That probably sounds hard to understand, so sorry..
Thanks.