New Vette Owner
Thread Starter
4th Gear
Joined: Feb 2006
Posts: 4
Likes: 0
From: Florida
New Vette Owner
Well I have a 94 Lt1 Vette. Have owned in a total of 2 weeks. I have a question about codes. I have read lot's about checking codes. How do you check them? Do I need to buy something.
Thanks
Jeff
Thanks
Jeff
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by FL_Jeff
Well I have a 94 Lt1 Vette. Have owned in a total of 2 weeks. I have a question about codes. I have read lot's about checking codes. How do you check them? Do I need to buy something.
Thanks
Jeff
Thanks
Jeff
RACE ON!!!
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
If you have a 16 pin diagnostic connecter, you can jump from the fourth pin in the top row to the fourth pin in the bottom row to get your codes. It will give you codes from the PCM, the CCM and the ABS/ASR module. You'll need a manual though, to interpret and diagnose them. Welcome to the forum! 
Thread Starter
4th Gear
Joined: Feb 2006
Posts: 4
Likes: 0
From: Florida
<Welcome to the forum, I also have a 1994 and love it.I am also from Florida>
pwrfl c4
Yeah I love driving it. Was going to use it for my daily vehicle but after I cleaned it I decided not to do this so went out and bought another car for this purpose. I also have a Harley and have found out the Vette community is like the Harley community. People love there Vettes, People love there Harleys.
pwrfl c4
Yeah I love driving it. Was going to use it for my daily vehicle but after I cleaned it I decided not to do this so went out and bought another car for this purpose. I also have a Harley and have found out the Vette community is like the Harley community. People love there Vettes, People love there Harleys.
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Melting Slicks
Joined: Nov 2002
Posts: 2,471
Likes: 2
From: 1993 Quasar Blue 'vert Scottsdale AZ
Welcome aboard! I spent the $29 from MAD and bought one of their code readers. Much easier to use, and they provide a code manual with it. But, you must buy a Helms Manual!
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
this link will explain how to do the paper clip method:
http://www.obd1.com/
and this link to tell you what the error codes mean:
http://www.troublecodes.net/GM/
if you have a 12 pin ALDL, short A & B:
if you have a 16 pin ALDL, short 4 & 12:
http://www.obd1.com/
and this link to tell you what the error codes mean:
http://www.troublecodes.net/GM/
if you have a 12 pin ALDL, short A & B:
if you have a 16 pin ALDL, short 4 & 12:
Last edited by MikeC4; Feb 28, 2006 at 10:28 PM.
Instructor
Joined: Aug 2001
Posts: 190
Likes: 0
From: WPB Fl
hey Jeff nice to know someone else in Fl with a vette
Feel free to ask me any questions you might have about C4's, I dont know alot but I do know some things. George
Wordy777@gmail.com
Wordy777@gmail.com
Burning Brakes
Joined: Feb 1999
Posts: 1,157
Likes: 3
From: Encino CA
Originally Posted by FL_Jeff
<Welcome to the forum, I also have a 1994 and love it.I am also from Florida>
pwrfl c4
Yeah I love driving it. Was going to use it for my daily vehicle but after I cleaned it I decided not to do this so went out and bought another car for this purpose. I also have a Harley and have found out the Vette community is like the Harley community. People love there Vettes, People love there Harleys.
pwrfl c4
Yeah I love driving it. Was going to use it for my daily vehicle but after I cleaned it I decided not to do this so went out and bought another car for this purpose. I also have a Harley and have found out the Vette community is like the Harley community. People love there Vettes, People love there Harleys.
You're not one of those people who keep it locked up in the garage just to drive on those special days, are you? I would think in a place like Florida where the weather is nice you would be driving the Vette every day. Who else are you saving it for?
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Originally Posted by kopbet89c4
On a 96 and up, you DEFINATELY need an OBD2 scanner
I have a 94 also, you do need something to read codes, and that IS a paperclip or simular item to join conectors 4 and 12. Read procedure below. You certainly dont need a scanner for any of them.
How to View Stored Diagnostic Codes on 1994 – 1996 Corvettes
You display codes on the digital LCD speedometer readout, by using a re-shaped paper clip to short ALDL pin 4 to pin 12.
1994 – 1996 Corvette ALDL connector:
You short pin "12" to pin "4" and turn the ignition switch to "On" without starting the engine.
The speedometer will display any codes using the same protocol as the 1990-1993 model but there are some changes in the designation for the modules plus additional modules are added:
Module "1" is still the CCM module.
Module "4" is now called the PCM module (Powertrain Control Module) because automatic transmission computer control was added to Engine Control Module in 1994.
Module 7 (on the 1996 model only) is the RTD module. (This is the Real Time Dampening module which replaced the Selective Ride Control module in 1996).
Module 9 is the ABS/ASR module number from 1994 through 1996.
Finally, Module "A", the DERM (Dynamic Energy Control Module --- (the air bag control module) will be requested to show any codes.
Just like the 1990-1993 display, you read the codes on the speedometer (big) and read the module number on the trip odometer (small).
A series of dashed lines for instance “ - - -“ indicates no more stored codes for that module.
A code showing as “C12” for the CCM module (module #1) means no codes are stored. So C12 is a good thing to see.
Again, you can cause the codes to repeat by turning the ignition off for five seconds and then back on.
Turn the ignition off and remove the short to restore normal operation.
To clear codes in the CCM proceed as follows:
1. With ignition "off" ground terminal #12 of the DLC (use bent paper clip to connect pin 4 to pin 12)
2. Turn ignition "on".
3. Press trip/odo button on the DIC until 1.7 appears in the trip
monitor area of the instrument cluster.
4. Press eng/met button on the DIC & hold until "---" appears in the
speedometer area of the cluster, this will clear CCM DTC'S.
To clear PCM/ECM codes do the following:
1. Press the trip reset button on the DIC until the desired system is displayed. In this case it will be 4.0.
2. Press trip/odo button on the DIC until the desired diagnostic mode(4.7) is displayed on the trip monitor area of the cluster.
3. Press & hold the eng/met button on the DIC until "---" is
displayed in the speedometer area of the cluster, this will clear PCM codes.
To clear ABS/ASR codes do the following:
Same as above but you’re looking for “9.7” on the trip odo
And here is the list of codes.
1994-1996: Diagnostic Trouble Codes
DTC #11: Malfunction Indicator Lamp Circuit.
DTC #13: Bank #1 Heated Oxygen Sensor #1 Circuit:
DTC #14: Engine Coolant Temperature Sensor Circuit Voltage Low.
DTC #15: Engine Coolant Temperature Sensor Circuit Voltage High.
DTC #16: Distributor Ignition System Low Pulse.
DTC #18: Injector Circuit.
DTC #21: Throttle Position Sensor Circuit Voltage High.
DTC #22: Throttle Position Sensor Circuit Voltage Low.
DTC #23: Intake Temperature Sensor Circuit Voltage High.
DTC #24: Vehicle Speed Sensor Circuit.
DTC #25: Intake Air Temperature Sensor Circuit Voltage Low.
DTC #26: Evaporative Emission Canister Purge Solenoid Valve Circuit.
DTC #27: EGR Vacuum Control Signal Solenoid Valve Circuit.
DTC #28: Transmission Range Pressure Switch Assembly Fault.
DTC #29: Secondary Air Injection Pump Circuit.
DTC #32: Exhaust Gas Recalculation.
DTC #33: Manifold Absolute Pressure Sensor Circuit High.
DTC #34: Manifold Absolute Pressure Sensor Circuit Low.
DTC #36: Distributor Ignition System High Pulse.
DTC #37: Brake Switch Stuck On.
DTC #38: Brake Switch Stuck Off.
DTC #41: Ignition Control Circuit Open.
DTC #42: Ignition Control Circuit Shorted.
DTC #43: Knock Sensor Circuit.
DTC #44: Bank 1 LF Heated Oxygen Sensor #1 Circuit Lean.
DTC #45: Bank 1 LF Heated Oxygen Sensor #1 Circuit Rich.
DTC #47: Knock Sensor Circuit Or Module Missing.
DTC #48: Mass Air Flow Sensor Circuit.
DTC #50: System Voltage Low.
DTC #51: EPROM Programming Error.
DTC #52: Engine Oil Temperature Sensor Circuit Voltage Low.
DTC #53: System Voltage Low.
DTC #55: Fuel Lean Monitor.
DTC #58: Transmission Fluid Temperature Sensor Circuit Low.
DTC #59: Transmission Fluid Temperature Sensor Circuit High.
DTC #62: Engine Oil Temperature Sensor Circuit Voltage Low.
DTC #63: Bank 2 RF Heated Oxygen Sensor #1 Circuit Open.
DTC #64: Bank 2 RF Heated Oxygen Sensor #1 Circuit Lean.
DTC #65: Bank 2 RF Heated Oxygen Sensor #1 Circuit Rich.
DTC #66: A/C Refrigerant Pressure Sensor Circuit Open.
DTC #67: A/C Pressure Sensor Circuit Sensor or A/C Clutch.
DTC #68: A/C Relay Circuit.
DTC #69: A /C Clutch Circuit.
DTC #70: A/C Clutch Relay Driver Circuit.
DTC #72: Vehicle Speed Sensor Loss.
DTC #73: Pressure Control Solenoid Circuit Current Error.
DTC #74: Traction Control System Circuit Low.
DTC #75: Transmission System Voltage Low
DTC #77: Primary Cooling Fan Relay Control Circuit.
DTC #78: Secondary Cooling Fan Relay Control Circuit.
DTC #79: Transmission Fluid Overtemp.
DTC #80: Transmission Component Slipping.
DTC #81: Transmission 2-3 Shift Solenoid Circuit.
DTC #82: Transmission 1-2 Shift Solenoid Circuit.
DTC #83: Torque Converter Solenoid Voltage High.
DTC #84: 3-2 Control Solenoid Circuit.(Auto Only).
DTC #84: 2nd And 3rd Gear Blockout Relay Control Circuit.
DTC #85: Transmission TCC Stock On.
DTC #90: Transmission TCC Solenoid Circuit.
DTC #91: One To Four Upshift Lamp(Manual Only).
DTC #97: VSS Output Circuit.
DTC #98: Tachometer Output Signal Voltage Wrong.
And the pics of the connector is above as posted by Mike C4 here:
Originally Posted by MikeC4
if you have a 16 pin ALDL, short 4 & 12:
Last edited by Casethecorvetteman; Mar 1, 2006 at 06:14 AM.
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
Welcome to the club (Forum). Buy a code reader for a OBD1 and buy a factory manual. www.helminc.com This combination will save you hundreds of dollars a year and will give you confidence to do more yourself. Good luck.
Pro
Joined: Nov 2005
Posts: 536
Likes: 0
From: Bardstown Kentucky
Originally Posted by FL_Jeff
Well I have a 94 Lt1 Vette. Have owned in a total of 2 weeks. I have a question about codes. I have read lot's about checking codes. How do you check them? Do I need to buy something.
Thanks
Jeff
Thanks
Jeff
Paper clip
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Originally Posted by elefkow
Welcome to the club (Forum). Buy a code reader for a OBD1 and buy a factory manual. www.helminc.com This combination will save you hundreds of dollars a year and will give you confidence to do more yourself. Good luck.
Code reader: NEGATIVE.
Spend the money on something worth while, and a code reader is a VERY expensive paper clip, cause that is about all it does. If youre that way inclined, buy a cable to plug into a COM port on a computer and buy some software. But for christ sake, DONT waste your money on a bloody code reader when a paper clip is almost free!!