OBD1 DTC Codes & Troubleshooting

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10-22-2009, 09:32 AM

meissenation

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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

Last edited by meissenation; 10-22-2009 at 03:23 PM.

OBD1 DTC Codes & Troubleshooting

OBD1 DTC Codes & Troubleshooting

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