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1993-97 Gen II Small Block V8

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Old 10-22-2009, 10:32 AM   #1
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Thumbs up OBD1 DTC Codes & Troubleshooting

I always notice people referencing a DTC code they get and it always is confusing where to start and what the DTC code really means. Every time I've seen someone mention a DTC code, I find myself referencing the service manual to see what it says. Well - that's fine when you have the service manual in your hands but when you're at work and need a quick reference... not so much. So, I spent a few hours taking pictures of every DTC description and troubleshooting chart in the 1995 OEM Service Manual, downsizing pics, uploading, etc. I'm sure this will come in handy for others.

First, the list of all the DTCs for an OBD1 FBody
Second, below that, links to every DTC description and troubleshooting chart.

Courtesy of Injuneer.com:
Quote:
11 - SES lamp circuit
13 - Bank 1 (left) O2 sensor, open circuit
14 - Coolant temp sensor, signal voltage low, high temperature
15 - Coolant temp sensor, signal voltage high, low temperature
16 - OptiSpark low resolution pulse not found
18 - Injector circuits
21 - TPS voltage high
22 - TPS voltage low
23 - IAT sensor, signal voltage high, low temperature
24 - VSS circuit
25 - IAT sensor, signal voltage low, high temperature
26 - Evaporative emissions canister purge solenoid circuit
27 - EGR solenoid circuit
28 - Transmission range pressure switch fault
29 - AIR pump circuit
32 - EGR recirculation
33 - MAP sensor, signal voltage high, low vacuum
34 - MAP sensor, signal voltage low, high vacuum
36 - OptiSpark high resolution signal faulty
37 - Brake switch stuck "on"
38 - Brake switch stuck "off"
41 - Ignition control circuit, open
42 - Ignition control circuit, short or grounded
43 - Knock sensor circuit
44 - Bank 1 (left) O2 sensor, lean
45 - Bank 1 (left) O2 sensor, rich
46 - PASS-Key II circuit
47 - Knock sensor module circuit, or module missing
48 - MAF sensor circuit
51 - EEPROM program error

53 - System voltage high
55 - Fuel lean monitor
58 - Transmission fluid temp circuit, voltage low, high temperature
59 - Transmission fluid temp circuit, voltage high, low temperature
61 - A/C system performance
63 - Bank 2 (right) O2 sensor, open circuit
64 - Bank 2 (right) O2 sensor, lean
65 - Bank 2 (right) O2 sensor, rich
66 - A/C refrigerant pressure sensor circuit, open or shorted
67 - A/C refrigerant pressure sensor circuit, pressure sensor or clutch problem
68 - A/C relay circuit, shorted
69 - A/C clutch circuit
70 - A/C clutch relay driver
71 - A/C evaporator temp sensor circuit
72 - VSS loss
73 - Pressure control solenoid circuit, current error
74 - TCS circuit low
75 - Transmission system voltage low
77 - Cooling fan relay control circuit
79 - Transmission fluid overtemp

80 - Transmission component slipping
81 - Transmission 2-3 shift solenoid circuit
82 - Transmission 1-2 shift solenoid circuit
83 - (M6) Reverse inhibit system
84 - (A4) Transmission 3-2 control solenoid circuit
84 - (M6) Skip shift solenoid circuit
85 - Transmission TCC stuck "on"
90 -Transmission TCC solenoid circuit
91 - Skip shift lamp circuit
97 - VSS output circuit
Filename Explanation:
DTC ##.jpg - DTC Description
DTC ##_2.jpg - DTC Troubleshooting Chart
If there is an A in the image name, it's specifically for automatic cars.
If there is a M in the image name, it's specifically for manual cars.

http://www.mifbody.com/DTCs/DTC 11.jpg
http://www.mifbody.com/DTCs/DTC 11_2.jpg
http://www.mifbody.com/DTCs/DTC 13.jpg
http://www.mifbody.com/DTCs/DTC 13_2.jpg
http://www.mifbody.com/DTCs/DTC 14.jpg
http://www.mifbody.com/DTCs/DTC 14_2.jpg
http://www.mifbody.com/DTCs/DTC 15.jpg
http://www.mifbody.com/DTCs/DTC 15_2.jpg
http://www.mifbody.com/DTCs/DTC 16.jpg
http://www.mifbody.com/DTCs/DTC 16_2.jpg
http://www.mifbody.com/DTCs/DTC 18.jpg
http://www.mifbody.com/DTCs/DTC 18_2.jpg
http://www.mifbody.com/DTCs/DTC 21.jpg
http://www.mifbody.com/DTCs/DTC 21_2.jpg
http://www.mifbody.com/DTCs/DTC 22.jpg
http://www.mifbody.com/DTCs/DTC 22_2.jpg
http://www.mifbody.com/DTCs/DTC 23.jpg
http://www.mifbody.com/DTCs/DTC 23_2.jpg
http://www.mifbody.com/DTCs/DTC 24.jpg
http://www.mifbody.com/DTCs/DTC 24_2.jpg
http://www.mifbody.com/DTCs/DTC 25.jpg
http://www.mifbody.com/DTCs/DTC 25_2.jpg
http://www.mifbody.com/DTCs/DTC 26.jpg
http://www.mifbody.com/DTCs/DTC 26_2.jpg
http://www.mifbody.com/DTCs/DTC 27.jpg
http://www.mifbody.com/DTCs/DTC 27_2.jpg
http://www.mifbody.com/DTCs/DTC 28.jpg
http://www.mifbody.com/DTCs/DTC 28_2.jpg
http://www.mifbody.com/DTCs/DTC 29.jpg
http://www.mifbody.com/DTCs/DTC 29_2.jpg
http://www.mifbody.com/DTCs/DTC 32a.jpg
http://www.mifbody.com/DTCs/DTC 32b.jpg
http://www.mifbody.com/DTCs/DTC 32_2a.jpg
http://www.mifbody.com/DTCs/DTC 32_2b.jpg
http://www.mifbody.com/DTCs/DTC 33.jpg
http://www.mifbody.com/DTCs/DTC 33_2.jpg
http://www.mifbody.com/DTCs/DTC 34.jpg
http://www.mifbody.com/DTCs/DTC 34_2.jpg
http://www.mifbody.com/DTCs/DTC 36.jpg
http://www.mifbody.com/DTCs/DTC 36_2.jpg
http://www.mifbody.com/DTCs/DTC 37.jpg
http://www.mifbody.com/DTCs/DTC 37_2.jpg
http://www.mifbody.com/DTCs/DTC 38.jpg
http://www.mifbody.com/DTCs/DTC 38_2.jpg
http://www.mifbody.com/DTCs/DTC 41.jpg
http://www.mifbody.com/DTCs/DTC 41_2.jpg
http://www.mifbody.com/DTCs/DTC 42.jpg
http://www.mifbody.com/DTCs/DTC 42_2.jpg
http://www.mifbody.com/DTCs/DTC 43.jpg
http://www.mifbody.com/DTCs/DTC 43_2.jpg
http://www.mifbody.com/DTCs/DTC 44.jpg
http://www.mifbody.com/DTCs/DTC 44_2.jpg
http://www.mifbody.com/DTCs/DTC 45.jpg
http://www.mifbody.com/DTCs/DTC 45_2.jpg
http://www.mifbody.com/DTCs/DTC 46.jpg
http://www.mifbody.com/DTCs/DTC 46_2.jpg
http://www.mifbody.com/DTCs/DTC 47.jpg
http://www.mifbody.com/DTCs/DTC 47_2.jpg
http://www.mifbody.com/DTCs/DTC 48.jpg
http://www.mifbody.com/DTCs/DTC 48_2.jpg
http://www.mifbody.com/DTCs/DTC 50.jpg
http://www.mifbody.com/DTCs/DTC 50_2.jpg
http://www.mifbody.com/DTCs/DTC 51.jpg
http://www.mifbody.com/DTCs/DTC 53.jpg
http://www.mifbody.com/DTCs/DTC 53_2.jpg
http://www.mifbody.com/DTCs/DTC 55.jpg
http://www.mifbody.com/DTCs/DTC 55_2.jpg
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Last edited by meissenation; 10-22-2009 at 04:23 PM..
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Old 10-22-2009, 10:34 AM   #2
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http://www.mifbody.com/DTCs/DTC 58.jpg
http://www.mifbody.com/DTCs/DTC 58_2.jpg
http://www.mifbody.com/DTCs/DTC 59.jpg
http://www.mifbody.com/DTCs/DTC 59_2.jpg
http://www.mifbody.com/DTCs/DTC 61.jpg
http://www.mifbody.com/DTCs/DTC 61_2.jpg
http://www.mifbody.com/DTCs/DTC 63.jpg
http://www.mifbody.com/DTCs/DTC 63_2.jpg
http://www.mifbody.com/DTCs/DTC 64.jpg
http://www.mifbody.com/DTCs/DTC 64_2.jpg
http://www.mifbody.com/DTCs/DTC 65.jpg
http://www.mifbody.com/DTCs/DTC 65_2.jpg
http://www.mifbody.com/DTCs/DTC 66.jpg
http://www.mifbody.com/DTCs/DTC 66_2.jpg
http://www.mifbody.com/DTCs/DTC 67.jpg
http://www.mifbody.com/DTCs/DTC 67_2.jpg
http://www.mifbody.com/DTCs/DTC 68.jpg
http://www.mifbody.com/DTCs/DTC 68_2.jpg
http://www.mifbody.com/DTCs/DTC 69.jpg
http://www.mifbody.com/DTCs/DTC 69_2.jpg
http://www.mifbody.com/DTCs/DTC 70.jpg
http://www.mifbody.com/DTCs/DTC 70_2.jpg
http://www.mifbody.com/DTCs/DTC 71.jpg
http://www.mifbody.com/DTCs/DTC 71_2.jpg
http://www.mifbody.com/DTCs/DTC 72_A.jpg
http://www.mifbody.com/DTCs/DTC 72_2_A.jpg
http://www.mifbody.com/DTCs/DTC 73.jpg
http://www.mifbody.com/DTCs/DTC 73_2.jpg
http://www.mifbody.com/DTCs/DTC 74.jpg
http://www.mifbody.com/DTCs/DTC 74_2.jpg
http://www.mifbody.com/DTCs/DTC 75.jpg
http://www.mifbody.com/DTCs/DTC 75_2.jpg
http://www.mifbody.com/DTCs/DTC 77.jpg
http://www.mifbody.com/DTCs/DTC 77_2.jpg
http://www.mifbody.com/DTCs/DTC 79.jpg
http://www.mifbody.com/DTCs/DTC 79_2.jpg
http://www.mifbody.com/DTCs/DTC 81.jpg
http://www.mifbody.com/DTCs/DTC 81_2.jpg
http://www.mifbody.com/DTCs/DTC 82.jpg
http://www.mifbody.com/DTCs/DTC 82_2.jpg
http://www.mifbody.com/DTCs/DTC 83_A.jpg
http://www.mifbody.com/DTCs/DTC 83_2_A.jpg
http://www.mifbody.com/DTCs/DTC 83_M.jpg
http://www.mifbody.com/DTCs/DTC 83_2_M.jpg
http://www.mifbody.com/DTCs/DTC 84_A.jpg
http://www.mifbody.com/DTCs/DTC 84_2_A.jpg
http://www.mifbody.com/DTCs/DTC 84_M.jpg
http://www.mifbody.com/DTCs/DTC 84_2_M.jpg
http://www.mifbody.com/DTCs/DTC 85.jpg
http://www.mifbody.com/DTCs/DTC 85_2.jpg
http://www.mifbody.com/DTCs/DTC 90.jpg
http://www.mifbody.com/DTCs/DTC 90_2.jpg
http://www.mifbody.com/DTCs/DTC 91.jpg
http://www.mifbody.com/DTCs/DTC 91_2.jpg
http://www.mifbody.com/DTCs/DTC 97.jpg
http://www.mifbody.com/DTCs/DTC 97_2.jpg
http://www.mifbody.com/DTCs/DTC 99.jpg
http://www.mifbody.com/DTCs/DTC 99_2.jpg
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Old 10-22-2009, 11:56 AM   #3
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Awesome. Now what about the OBDII guys?
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Old 10-22-2009, 03:26 PM   #4
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Haha sorry dude - only have a 1995 Service Manual for OBD1.
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Old 10-22-2009, 03:40 PM   #5
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Needs to be a sticky!
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Old 10-22-2009, 04:24 PM   #6
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Added the following explanation before the images:
Quote:
Filename Explanation:
DTC ##.jpg - DTC Description
DTC ##_2.jpg - DTC Troubleshooting Chart
If there is an A in the image name, it's specifically for automatic cars.
If there is a M in the image name, it's specifically for manual cars.
Hope that helps.
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Old 10-22-2009, 11:49 PM   #7
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thats some great info you got there man!
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Old 10-25-2009, 12:22 PM   #8
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That helps alot!
I also agree that an OBDII list would be just as helpful!

Thanks for doing this,it had to be time consuming.
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Old 10-26-2009, 09:14 AM   #9
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If anyone has an OBD2 Service Manual for the electronic diagnosis I can take photos of those, upload them, and ship the book back.
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Old 01-04-2010, 01:06 AM   #10
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Default OBD1 code 26

I have a 94 SLP Firehawk having numerous problems. First, I have a hard code 26 quad driver # 1 fail. Snap on scanner shows L&R integrater at 128 but BLM on the left bank in the high 140s, L O2 sensor running between 87 to 145 and the right up to 950 mv in closed loop. The wideband shows full lean at idle and the engine is popping badly Into the exhaust. When it does pop, the wideband richens slightly. Off idle it stops popping and richens to around 17:1 and 14:7 when snapped. I changed the L O2 sensor an chased the wiring. I've lost comm with the scanner and can't connect at all with my Datamaster and the Tunercat on the laptop. I've changed datacords, traced the entire harness and changed PCMs. I now have comm with the laptop and scanner for some unknown reason. I burned up two motors last summer lean burning the left bank pistons both times. I bought an Impala drove it home, pulled the motor and installed it into my car using my harness and the Impalas PCM. The same lean run is happening! 42 psi at idle and 38 under load. Bad harness? I have another one to install on it. I did have a soft code for the L O2 which didn't come back after clearing, but still have the above problem.
Service manuals show 26 as an EGR problem which is turned off. The scanner says it's a driver fail. I have found reference to a QD#1 for this application but haven't located what the #1 driver runs. I'm betting it runs the left O2 and left bank injectors. Help!
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Old 01-04-2010, 06:24 AM   #11
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I vote thread of the year

And sticky of the year too!
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Old 01-04-2010, 11:44 AM   #12
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Quote:
Originally Posted by Wildbill040 View Post
I have a 94 SLP Firehawk having numerous problems. First, I have a hard code 26 quad driver # 1 fail. Snap on scanner shows L&R integrater at 128 but BLM on the left bank in the high 140s, L O2 sensor running between 87 to 145 and the right up to 950 mv in closed loop. The wideband shows full lean at idle and the engine is popping badly Into the exhaust. When it does pop, the wideband richens slightly. Off idle it stops popping and richens to around 17:1 and 14:7 when snapped. I changed the L O2 sensor an chased the wiring. I've lost comm with the scanner and can't connect at all with my Datamaster and the Tunercat on the laptop. I've changed datacords, traced the entire harness and changed PCMs. I now have comm with the laptop and scanner for some unknown reason. I burned up two motors last summer lean burning the left bank pistons both times. I bought an Impala drove it home, pulled the motor and installed it into my car using my harness and the Impalas PCM. The same lean run is happening! 42 psi at idle and 38 under load. Bad harness? I have another one to install on it. I did have a soft code for the L O2 which didn't come back after clearing, but still have the above problem.
Service manuals show 26 as an EGR problem which is turned off. The scanner says it's a driver fail. I have found reference to a QD#1 for this application but haven't located what the #1 driver runs. I'm betting it runs the left O2 and left bank injectors. Help!
You kinda hijacked this thread. It would be better to start one of your own. You would probably get more suggestions for your situation. I know you emailed me with your problem, but it would be better to get more than just me looking at it.

For a 1994, DTC 26 is only for the EVAP solenoid circuit. All that quad driver stuf is for a 1993 ECM that is different from your PCM.
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Old 01-06-2010, 06:53 PM   #13
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Actually, I found the quad driver #1 drives the evap system. I also found the problem all along was the harness shorting out the driver for the left bank injectors shutting them off intermittantly. Thanks
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Old 01-06-2010, 06:55 PM   #14
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this should definitely be a sticky, great job on it. Looks like you have a lot of free time lol
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Old 01-06-2010, 07:08 PM   #15
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Defiantly Sticky Worthy!!!
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Old 01-08-2010, 03:40 PM   #16
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Quote:
Originally Posted by djjab57 View Post
this should definitely be a sticky, great job on it. Looks like you have a lot of free time lol
Too much time spent on dumb ****. But - when I got my head set on doing something to help everyone out... I get 'er done.
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Old 01-08-2010, 10:20 PM   #17
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Great job man, it sure deserves to be a sticky!
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Old 03-16-2011, 10:07 PM   #18
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um thank you for the free book.... I have been looking for one of these
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Old 03-31-2011, 08:28 PM   #19
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Yeah, a Very good resource for all us OBD1 guys.. why was it never made a sticky again?
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Old 04-26-2011, 09:00 AM   #20
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Sticky!!!!
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Old 04-26-2011, 09:00 AM
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