OBD-I trouble codes

[Martin M.]

HI: where might I get a complete list of OBD-I trouble codes?

Marty

[Edward J.]

Re: OBD-I trouble codes

Martin, whats the code no. maybe I can help? I would also think there maybe something somewhere on the web.

[Martin M.]

Re: OBD-I trouble codes

Thanks - Found them at site below - thx to Clem Zahrobsky

http://www.extreme-check-engine-ligh...%20Decoder.htm

Marty

[William C.]

Re: OBD-I trouble codes

Really depends on the engine you are running, as the different engine packages had differing calibrations and hardware packages. What Year and engine are you looking for?

[Bill L.]

Re: OBD-I trouble codes

I use the attached list .... this one is correct for 1994 LT1 Corvettes.... be aware that the C12 code is in fact a delimiter code that just tells you the system is working... any code with a "C" in front i.e. C21, C25 etc is a "current" trouble code... if it has an "H" in front like "H21" or "H25" etc it has been fixed and the code stored in history... there is a simple procedure to clear the codes.. the C12 will remain.... contrary to popular opinion disconnecting the battery will not clear the codes... As you read the codes the system will cycle through each module and display any current or history codes.... or... no codes if there are no current problems and any history has been cleared.

Regards
Bill Lucia #8620

CCM=Module 1
PCM=Module 4
ABS/TCS EBTCM is Module 9
DERM (Airbag) is Module A

CCM Fault Code List (Module 1.0)
Code Definition
12 On-Board Diagnostics Operational; No Codes
13 DIC Switches Open or Shorted to B+
14 DIC Switches Shorted to Ground
16 Ignition 3 Fuse Circuit Open
21 Horn Relay Coil Shorted to B+ or CCM Internal Open
22 Rear Defogger Relay Coil Shorted to B+ or CCM Internal Open
24 Courtesy Lamp Relay Coil Shorted to B+ or CCM Internal Open
25 Courtesy Lamp Relay Coil Circuit Open or Shorted to Ground
26 LCD Blanking Control Circuit Shorted to B+ or CCM Internal Open
27 LCD Blanking Control Circuit Open or Shorted to Ground
31 LCD Data Circuit Shorted to B+ or CCM Internal Open
32 LCD Data Circuit Open or Shorted to Ground
33 Data Clock Circuit Shorted to B+ or CCM Internal Open
34 Data Clock Circuit Open or Shorted to Ground
35 Data Strobe Circuit Shorted to B+ or CCM Internal Open
36 Data Strobe Circuit Open or Shorted to Ground
37 M Clock Circuit Shorted to B+ or CCM Internal Open
38 M Clock Circuit Open or Shorted to Ground
41 Loss of ECM Serial Data Communication
51 Pass-Key - Invalid Key Detection
52 Pass-Key - Key Detection Circuit Shorted
53 Pass-Key - Key Detection Circuit Open or Shorted to B+
54 Pass-Key - Fuel Enable Failure
61 Pass-Key - Key # 1 Programming Resistance Out of Range
62 Pass-Key - Key # 2 Programming Resistance High
63 Pass-Key - Key # 2 Programming Resistance Low
71 LCD Dimming Output Circuit Shorted to B+ or CCM Internal Open
72 LCD Dimming Output Circuit Open or Shorted to Ground
73 LED Display Dimming Output Circuit Shorted to B+ or CCM Internal Open
74 LED Display Dimming Output Circuit Open or Shorted to Ground

LTPWS Fault Code List (x.x)
Code Definition
99 Receiver/Control Module Diagnosis
23 Right Tire Rear Low Tire
24 Right Tire Rear Sensor Fault
33 Left Tire Rear Low Tire
34 Left Tire Rear Sensor Fault
43 Left Tire Front Low Tire
44 Left Tire Front Sensor Fault
53 Right Tire Front Low Tire
54 Right Tire Front Sensor Fault


ABS Fault Code List (Module 9.0)
Code Definition
21 Right Front Wheel Speed Sensor Fault
22 Right Front Toothed Wheel Frequency Error
25 Left Front Wheel Speed Sensor Fault
26 Left Front Toothed Wheel Frequency Error
31 Right Rear Wheel Speed Sensor Fault
32 Right Rear Toothed Wheel Frequency Error
35 Left Rear Wheel Speed Sensor Fault
36 Left Rear Toothed Wheel Frequency Error
41 Right Front Solenoid Valve Fault
45 Left Front Solenoid Valve Fault
55 Rear Wheels Solenoid Valve Fault
61 Pump Motor or Motor Relay Fault
63 Solenoid Valve Relay Fault
71 Electronic Brake Control Module Fault
72 Serial Data Line Fault
75 Lateral Accelerometer Fault (Short ot Open)
76 Lateral Accelerometer Fault (Signal out of Range)

SIR (Airbag) Fault Code List (AKA DERM) (Module A)
Code Definition
21 Steering Column Circuit Resistance too High
22 Steering Column Circuit Resistance too Low
23 Steering Column Circuit Voltage too High
23 Steering Column Circuit Voltage too Low
25 Short to Battery in Steering Column Circuit
26 Open in Steering Column Circuit
31 Open 36 VLT to Deployment Loop
32 Grounded 36 VLT to Deployment Loop
33 History Code, Diode B Shorted in Wiring Harness to Arming Sensor
34 Open in Ignition 1 Feed to Deployment Loop
35 Discriminating Sensor Open
41 and / or 42 Deployment Loop Energy Reserve Voltage Fault
51 Accident Detected
52 EEPROM Accident Data Area Full
61 Force Low or "INFL REST" Warning Lamp Circuit Failure
71 Internal DERM Fault

[Bill L.]

NB: C12 is not an error code but indicates the On board diagnostics are operational.

[Bill H.]

Re: OBD-I trouble codes

What Bill shows is correct for a 94 (I think for 95 also).
If you have a 92-93 both the jump positions on the ADL connector (paperclip) and the codes are different.

I have the complete procedure on an Adobe PDF file and can email it to you.

[Bill L.]

Re: OBD-I trouble codes

Hi Guys:

My understanding is that the 94 and the 95(maybe?) use an OBDII connector but the system is based on OBDI.... I know my 94 has an OBDII connector so you jump pin 4 to 12 to get the codes... OBDI codes get displayed.......not sure what pins to jump if have an OBDI style connector on the 92-93 cars....

Regards
Bill

[Bill H.]

Re: OBD-I trouble codes

Hi Guys:

My understanding is that the 94 and the 95(maybe?) use an OBDII connector but the system is based on OBDI.... I know my 94 has an OBDII connector so you jump pin 4 to 12 to get the codes... OBDI codes get displayed.......not sure what pins to jump if have an OBDI style connector on the 92-93 cars....

Regards
Bill

Yep, correct Bill

The pins on the ADL for 92-93 are lettered. You jump A & G which, looking at the front of the connector, A is on the bottom row to the far left and G is on the top row to the far right.
And the codes are different.