I just my ecu/ecm #16159278 back from being rebuilt its giving the same dtc code 26, and "infl rest" light stayed on with "service engine soon" light. Before I sent it off it had a rough idle between 450-800 rpms, and also was really slugish apon takeoff and while attemting to pass unless I shiffed from overdrive to 2nd or 3rd. I know the slog pump is bad, and the air bypass was removed by the owner before me. I did a full tuneup on the car plugs, wires, dist. cap, rotor,oil & filter, air filter, trans filter & complete fluid flush, fuel filter, brakes & rotors, O2 sensers, before I sent the ecu to be rebuilt. Now I'm still getting the same dtc code 26, and "infl rest" light stayed on with "service engine soon" light, after installing the ecu I ran the car about 15-20 min in the drive way,now it idles between 1200-1600 rpms, then did a short road test about 3 miles. It shifts good and good takeoff power. Does anyone have any experience or idea where my problem lies, or where to start? Also I'm planning to remove the smog pump, and the cats from the exhuast system.

 

From the FSM:
The ECM controls several components through the use of a "Quad-Driver" module integrated into the ECM. Most devices, such as solenoids or relays, receive battery power through a fused circuit to the ignition, and turn "ON", when the circuit is completed to ground. The "Quad-Driver" consists of several electronic switching circuits that provide the ground connection to complete these circuits and turn the devices "ON".

Each "Quad-Driver" has a fault line that is monitored by the ECM. When the QDM switch for a particular circuit is "OPEN", the voltage at the "sense line" will be high (near battery voltage), and when the device is turned "ON" (circuit completed to ground), the voltage at the "sense line" will drop to zero or near zero volts. When a device is commanded "OFF", the ECM expects the voltage in that "sense line" to be high, and when a device is commanded "ON", the ECM expects the voltage in that "sense line" to go low. The QDM fault detection circuit monitors the voltage in the sense line for each device controlled by the QDM. If the QDM fault detection circuit "sees" a voltage other than what it expects for a device in a particular "ON" or "OFF" state, the fault line status will change, and a Code 26 will set. The fault line signal status can be displayed on a "Scan" tool.

Code 26 will set if the ECM detects the wrong voltage potential in a QDM #1 sense line for 20 seconds.

The ECM is indicating a short or open in a circuit connected to QDM#1. The circuit must be identified and repaired. A common failure is the purge solenoid.

 

thanks blackbear bob for the info. Is there way bypass these system? So it will not give anymore codes related to the emissioms systems. I would like to remove as many electronic componennts as possible to keep my car running. I will be removing the instrument cluster, power windows, power seats, and maybe a few other things.

 

Instead of throwing your money away having parts rebuilt that don't need it or removing parts because you don't understand them, invest in the correct factory service manual for your car and learn how it functions.

 

http://tech.corvettecentral.com/2011...trouble-codes/

http://www.gearhead-efi.com/Fuel-Inj...ull=1#post6626

 

DO THIS ASAP

 

Thanks for helpful info. Know where I can get one?

 

helminc.com

Check the parts for sale section here

Check eBay - you want the ones with RED covers

 

thanks I'll check it out tonite