thought this might be useful, Here ya go. the blue means the code isn't aplicable to all models.



-Eric J.

 

this should be stickied!

 

I actually book marked on my phone

 

I'm getting an OBD1 code 11, with a CEL, on my 1995 Firebird Formula... Anyone have any ideas wth is going on with it??

Gary B>
Darkside

 

I would say you have big problems given that the lowest code number is 12

 

12 is normal, you should always get 12.

Heres another site with similar info that ive found useful:

http://www.theimportkiller.com/forum...hp?topic=420.0

 

Found out that OBD-1 has a legitimate code 11, for the Malfunction indicator lamp circuit.. somebody posted the details on my other thread here...

https://www.thirdgen.org/forums/tech...rmula-obd.html

 

Thank you!! very helpful!!!

 

Will this work on my 87 2.8 V6

 

The same code can mean something totally different if the car came with a carb.
Here is a more comprehensive list:

GM 2 Digit codes for 82 and up (non OBD-II) code definition
12- diagnostic mode
13- 02 sensor or circuit
14- coolant sensor or circuit/ high temp indicated
15- coolant sensor or circuit/ low temp indicated
16- system voltage out of range
19- crankshaft position sensor or circuit
21- throttle position sensor or circuit- voltage high
22- throttle position sensor or circuit- voltage low
------------------------------------------------------------
23- mixture control (m/c) solenoid or circuit (carbureted models)
23- manifold air temperature (mat) sensor or circuit (1990 and earlier models)
23- intake air temperature (iat) sensor circuit (fuel-injected models)
------------------------------------------------------------
24- vehicle speed sensor (vss) or circuit
------------------------------------------------------------
25- manifold air temperature (mat) sensor or circuit - high temperature indicated (1990 and earlier models)
25- intake air temperature (iat) sensor or circuit - high temperature indicated (1991 and later models)
------------------------------------------------------------
26- quad driver module circuit
27- quad driver module circuit
28- quad driver module circuit
29- quad driver module circuit
31- park/neutral position (pnp) switch circuit
------------------------------------------------------------
32- baro sensor or circuit (carbureted models)
32- egr circuit (fuel-injected models)
------------------------------------------------------------
33- manifold absolute pressure (map sensor signal voltage high
33- mass air flow (maf) sensor or circuit - excessive airflow indicated
------------------------------------------------------------
34- manifold absolute pressure (map) sensor signal voltage low
34- mass air flow (maf) sensor signal - low airflow indicated
------------------------------------------------------------
35- idle speed control (isc) switch or circuit (shorted) (carbureted models)
35- idle air control (iac) valve/ circuit
------------------------------------------------------------
38- brake switch circuit
39- torque converter clutch (tcc) circuit
------------------------------------------------------------
41- no distributor signals to ecm, or faulty ignition module ( carbureted models)
41- cylinders select error- mem-cal or ecm problem ( fuel-injected models
41- cam sensor circuit (3.8 engine)
------------------------------------------------------------
42- bypass or electronic spark timing (est) circuit
------------------------------------------------------------
43- low voltage at ecm terminal l (carbureted models)
43- knock sensor circuit
------------------------------------------------------------
44- oxygen sensor or circuit - lean exhaust detected
45- oxygen sensor or circuit - rich exhaust detected
46- power steering pressure switch circuit
48- misfire diagnosis
51- prom, mem-cal or ecm problem
52- calpak or ecm problem
------------------------------------------------------------
53- egr fault (carbureted models only)
53- system over-voltage (ecm over 17.7 volts)
------------------------------------------------------------
54- mixture control (m/c) solenoid or circuit (carbureted models)
54- fuel pump circuit (1986 and later models)
------------------------------------------------------------
55- oxygen sensor circuit or ecm
55- fuel lean monitor (2.2l engine)
------------------------------------------------------------
61- oxygen sensor signal faulty (possible contaminated sensor)
62- transaxle gear switch signal circuits
63- manifold absolute pressure (map) sensor voltage high (low vacuum detected)
64- manifold absolute pressure (map) sensor voltage low (high vacuum detected)
66- pressure sensor or circuit air conditioning
67- A/C pressure sensor circuit error
68- A/C clutch relay circuit error (shorted to ground)
69- A/C clutch relay circuit error (open circuit indicated)
69- A/C high pressure switch error
70- A/C pressure sensor circuit error (high pressure indicated)
71- A/C evaporator temp sensor circuit error (low temp indicated)
72- VSS signal circuit error
73- A/C evaporator temp sensor circuit error (high temp indicated)
75- Digital EGR solenoid #1 circuit error
76- Digital EGR solenoid #2 circuit error
77- Digital EGR solenoid #3 circuit error
79- Transmission fluid overtemp
80- Transmission component slipping
82- 3x Crankshaft position sensor circuit error
85- PROM error
86- A/D error
87- EEPROM error (flash memory error)
90- TCC error
93- Transmission pressure control solenoid circuit error
96- Transmission system voltage low
98- Invalid PCM program
99- Invalid PCM program

you're welcome