95 LT-1 OBD1/OBD2 Scan Tool Please Advise THX!!
06-07-2007, 11:15 PM
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95 LT-1 OBD1/OBD2 Scan Tool Please Advise THX!!
Hello, due to the support of Corvette Forum members (thank you everybody) I've decided to purchase a scanner and do dynamic testing on my own vehicle while idling and driving-there may be a bad sensor connector, etc., and the dealer is just throwing parts at it to no avail. I have two in mind: The ACTRON CP9190, which I was told would pick up 20 parameters, or the OTC SCAN PRO 3499, which is supposed to pick up over 100 parameters. This is a 1995 (hybrid OBD1/OBD2) but has the OBD2 connector underdash. Anybody have any experience with either of these scanners or any recommedations? I'm mechanically inclined but not an expert-and I cannot afford a TECH II scanner. Forget the dealer-I'm done with them ($$$) and they "can't fix it" Thanks!!
06-08-2007, 12:12 AM
#2
Race Director
06-08-2007, 04:19 AM
#3
Le Mans Master
Here is the paper clip method to retrieve the DTCs
On a 94/95 you can check the codes with a paper clip as follows:
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 the codes,
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 are the codes
1994-1995: 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.
On a 94/95 you can check the codes with a paper clip as follows:
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 the codes,
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 are the codes
1994-1995: 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.
Last edited by Casethecorvetteman; 06-08-2007 at 04:22 AM.
06-08-2007, 04:26 AM
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Thanks For The Info!! Wow!!
Hello,
She's not throwing any codes at all-just has a rotten egg/sulphur/sour exhaust smell and the dealership threw every kind of part at it you could imagine and said NOTHING is wrong with it. We're figuring most likely a bad sensor connector somewhere or perhaps a problem with an injector. Lots of $$$ have been spent and everything has been replaced including the CATS, O2 sensors, etc., etc. The vehicle DOES from what I have been told have some OBD II codes and has an OBD II connector underdash, but essentially is an OBD I car......and is a late build 95. I want to buy a good hand held scanner to diagnose it myself. THX!!
She's not throwing any codes at all-just has a rotten egg/sulphur/sour exhaust smell and the dealership threw every kind of part at it you could imagine and said NOTHING is wrong with it. We're figuring most likely a bad sensor connector somewhere or perhaps a problem with an injector. Lots of $$$ have been spent and everything has been replaced including the CATS, O2 sensors, etc., etc. The vehicle DOES from what I have been told have some OBD II codes and has an OBD II connector underdash, but essentially is an OBD I car......and is a late build 95. I want to buy a good hand held scanner to diagnose it myself. THX!!
06-08-2007, 05:30 AM
#5
Le Mans Master
Late, early, mid year, doesnt matter a bit. At least you give us the full info though, which is great 
Its a 95 no matter when it was built, diagnostics will still be the same. You wont learn anymore info from the OBD2 codes it may have set, cause the OBD2 codes wont set the SES light on to let you know they are there. The OBD1 codes are very simular in what they actually mean.
Do you have a Genuine GM service manual for this car yet?
If you get the scanner, youll be able to watch what is doing what, however this is why we have recomended the laptop and Data Master route, cause it displays it all on the screen at once, and you can send the files to others for opinions, and the fact is, its a bloody good program
Its a 95 no matter when it was built, diagnostics will still be the same. You wont learn anymore info from the OBD2 codes it may have set, cause the OBD2 codes wont set the SES light on to let you know they are there. The OBD1 codes are very simular in what they actually mean. Do you have a Genuine GM service manual for this car yet?
If you get the scanner, youll be able to watch what is doing what, however this is why we have recomended the laptop and Data Master route, cause it displays it all on the screen at once, and you can send the files to others for opinions, and the fact is, its a bloody good program
06-08-2007, 06:27 AM
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95 LT-1 THANKS to you sir!!!
Late, early, mid year, doesnt matter a bit. At least you give us the full info though, which is great Its a 95 no matter when it was built, diagnostics will still be the same. You wont learn anymore info from the OBD2 codes it may have set, cause the OBD2 codes wont set the SES light on to let you know they are there. The OBD1 codes are very simular in what they actually mean.
Do you have a Genuine GM service manual for this car yet?
If you get the scanner, youll be able to watch what is doing what, however this is why we have recomended the laptop and Data Master route, cause it displays it all on the screen at once, and you can send the files to others for opinions, and the fact is, its a bloody good program
Its a 95 no matter when it was built, diagnostics will still be the same. You wont learn anymore info from the OBD2 codes it may have set, cause the OBD2 codes wont set the SES light on to let you know they are there. The OBD1 codes are very simular in what they actually mean. Do you have a Genuine GM service manual for this car yet?
If you get the scanner, youll be able to watch what is doing what, however this is why we have recomended the laptop and Data Master route, cause it displays it all on the screen at once, and you can send the files to others for opinions, and the fact is, its a bloody good program
06-08-2007, 06:39 AM
#7
Le Mans Master
Id certainly look into the laptop and Datamaster yeah, very good option. You can also then get another program called Tuner Cat which will allow you to tune the car from the laptop, and it will also flash the info into your PCM. The laptop is an invaluable tool for your car
You can download the Datamaster program now and install it on the computer youre using, then have a look at it, if you want to see if in action i can send you a log file to run through it
You can download the Datamaster program now and install it on the computer youre using, then have a look at it, if you want to see if in action i can send you a log file to run through it
06-08-2007, 09:50 AM
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Id certainly look into the laptop and Datamaster yeah, very good option. You can also then get another program called Tuner Cat which will allow you to tune the car from the laptop, and it will also flash the info into your PCM. The laptop is an invaluable tool for your car
You can download the Datamaster program now and install it on the computer youre using, then have a look at it, if you want to see if in action i can send you a log file to run through it
You can download the Datamaster program now and install it on the computer youre using, then have a look at it, if you want to see if in action i can send you a log file to run through it
06-10-2007, 09:03 AM
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95 LT-1 diagnostics/laptop, etc. roteen egg/sulphur/sour smell
01-29-2008, 10:48 PM
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I'm in the same boat. I have a 95 that clearly says OBDI on the emission lable but it has a 16 pin DTC. I would like to buy a scanner to read codes without going to the laptop route. I have the FSM for the 95. The paper clip method for the 12 pin or 16 pin is all well and good but I am a old guy and it would be easyer to just plug a cable in and read from a scanner. I would like to be able to read ABS codes also.
01-31-2008, 10:39 PM
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HEY GUYS, I HAVE THE SAME PROBLEM, 95 LT-1, AND I E-MAILED ACTRON AND GOT THIS RESPONCE, HAVEN'T BOUGHT ONE YET STILL SEARCHING FOR ANSWERS.
I recommend the CP9145/CP9150 or the CP9185/CP9190. These tools are definitely compatible with your 1995 Chevy Corvette, 5.7 V8, VIN (P) LT-1. Also, your vehicle may be OBD II and have a blown fuse; that would cause many OBD II tools to not read it. You may want to check the 5 amp RH CTSY (Fuse 36), located in the I/P fuse block.
Sincerely,
SPX Technical Service
SPX Corporation - Service Solutions
Cleveland_Tech@ServiceSolutions.SPX.com
800-228-7667(Phone) 800-955-8329(FAX)
I recommend the CP9145/CP9150 or the CP9185/CP9190. These tools are definitely compatible with your 1995 Chevy Corvette, 5.7 V8, VIN (P) LT-1. Also, your vehicle may be OBD II and have a blown fuse; that would cause many OBD II tools to not read it. You may want to check the 5 amp RH CTSY (Fuse 36), located in the I/P fuse block.
Sincerely,
SPX Technical Service
SPX Corporation - Service Solutions
Cleveland_Tech@ServiceSolutions.SPX.com
800-228-7667(Phone) 800-955-8329(FAX)
03-29-2008, 01:36 AM
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I know this thread is a little old but I have to try.
Im new here so If I can Id like to help. I just went out with my actron cp9145(got it for my 97 tahoe) it lets you read back to 1984, but 93 maybe 94 and older you will need an adapter for the car. I own a 95 and it read everything with no problems even live data RPMS,IAT,MAP,O2s ect. and at the top it would display the codes if any. I had none so im not sure about that. Im going to unplug somethings later to see what data I can get. If anyone would like to know sooner let me know I can do this tomorrow morning. You must start the car to read the codes
Im new here so If I can Id like to help. I just went out with my actron cp9145(got it for my 97 tahoe) it lets you read back to 1984, but 93 maybe 94 and older you will need an adapter for the car. I own a 95 and it read everything with no problems even live data RPMS,IAT,MAP,O2s ect. and at the top it would display the codes if any. I had none so im not sure about that. Im going to unplug somethings later to see what data I can get. If anyone would like to know sooner let me know I can do this tomorrow morning. You must start the car to read the codes
