I installed a 1st to 4th bupass module on my 2000 coupe but unfortunately I didn't disconnet the battery before I installed it. The lockout function has been disabled and I don't get the 1st to 4th lockout as before, but my check engine light comes on. The car runs fine. Did I initiate an emissions code by breaking the original connection on the transmission without first disconnectiong the battery, since this lockout function seems to be emissions related? Is it just a matter of clearing the code?

Thanks,
Dave K.

 

Hmmm? that is a new one...
I did not disconnect my battery when I made the change and there has been no such issue...... I used a COH CAGS eliminator....

 

Use the procedure linked below to check and write down your codes and clear them as well if they are history codes. Putting in a CAGS bypass shouldn't trigger any codes or the CE light. Check your codes and then post any current ones here so we can try and help.

https://www.corvetteforum.com/techti...D=26&TopicID=1

 

I didnt disconnect my battery and never got a code

 

I doubt that most people that did a CAGS bypass disconnected the battery. I know of at least ten done that way including mine, no problems.

 

While I had my car on the lift to install the CAGS bypass I changed the oil. New Fram filter and 6 qts. of Pennzoil Platinum synthetic 10-30W. Crankcase is full and oil pressure is good. Don't know if it is related to the check engine light. Going to do a check of the codes stored.

I agree that as long as I did not switch on the ignition, installation of the CAGS w/o battery disconnect should be inconsequentional.


Thanks,
Dave K.

 

Diagnostic Codes are as follows:

P10 P0803HC
58SDM B0026H
99HVAC B0441HC
A6SCM B2605H 2860H
60BORFA U1064H U1016H

I manually cleared P0803HC (1-4 upshift solenoid control circuit) and the check engine light went out. However, once I started the engine I did another diagnostic and it returned under module P10, but the check engine light did not come back. The light returned after I drove the car a while. I can repeat the process -- light goes out when I clear P0803HC but returns shortly after.

I think that I should check the CAGS bypass connection again but I'm sure that it was plugged and locked into the the car harness properly. I wonder if I have a faulty CAGS pigtail?

Thanks,
Dave K.

 

 

If your getting a code related to the CAGS it may be defective..I put mine in with the battery connected and no problems..The CAGS plug has a resistor in it that is the same value as the coil in the solenoid in the transmission..It fools the computer in to thinking the transmission solenoid is still connected..Try hooking up the original connection and see if the code goes away..if it does your CAGS bypass is defective.

 

Easy way to see if it's bad.

Diagnostic from the manual

DTC P0803
Circuit Description
With the ignition ON battery voltage is supplied directly to the skip shift solenoid. The powertrain control module (PCM) controls the solenoid by grounding the control circuit via an internal switch called a driver. The driver supplies the ground for the component being controlled. Each driver has a fault line which the PCM monitors. When the PCM commands a component ON, the voltage of the control circuit should be low (near 0 volts). When the PCM commands the control circuit to a component OFF, the voltage potential of the circuit should be high (near battery voltage). If the internal fault detection circuit senses a voltage other than what is expected, the fault line status changes causing the DTC to set.

Conditions for Enabling the 1-4 Upshift Solenoid
The vehicle speed is between 24-31 km/h (15-19 mph).
The engine coolant temperature (ECT) is greater than 77°C (171°F).
The BARO is greater than 76 kPa.
The accelerator pedal position (APP) is less than 26 percent.
Once the 1-4 Upshift solenoid is enabled the solenoid will not be re-enabled until the vehicle speed returns to 0 km/h (0 mph) and the conditions for enabling the 1-4 Upshift solenoid are met.

Conditions for Running the DTC
The engine speed is more than 400 RPM.
The ignition voltage is between 6.0 volts and 18.0 volts.
Conditions for Setting the DTC
The PCM detects that the commanded state of the driver and the actual state of the control circuit do not match.
Condition must exist for a minimum of 5 seconds.
Action Taken When the DTC Sets
The PCM stores the DTC information into memory when the diagnostic runs and fails.
The malfunction indicator lamp (MIL) will not illuminate.
The PCM records the operating conditions at the time the diagnostic fails and stores this information in the Failure Records.
Conditions for Clearing the DTC
A last test failed, or current DTC clears, when the diagnostic runs and does not fail.
A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
Use the scan tool in order to clear the DTC.
Diagnostic Aids
Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM.
For any test that requires probing the PCM or a component harness connector, use the J 35616-A connector test adapter kit. Using this kit prevents damage to the harness/component terminals. Refer to Using Connector Test Adapters in Wiring Systems.
Low system voltage can cause this DTC to set. When reviewing captured data, verify if a low system voltage condition was present at the time the DTC was stored in memory.
For an intermittent condition, refer to Testing for Intermittent and Poor Connections in Wiring Systems.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.

Listen for an audible click when the skip shift solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.

Tests for voltage at the coil side of the skip shift solenoid. The ENG IGN1 fuse supplies power to the coil side of the skip shift solenoid.

Verifies that the powertrain control module (PCM) is providing ground to the skip shift solenoid.

Tests if ground is constantly being applied to the skip shift solenoid.

 

My vette threw the same code. Bad wire on the CAGS.

 

Was this on the CAGS bypass or the stock CAGS wiring? How did you fix it? Did you install a CAGS bypass?

Regards,
Dave K.

 

Dave,
The wire was bad on the bypass. I uninstalled it, threw it away and gas it in first. Bill

 

No shift until ~2K = end of problem.