EO26 ?

[Roadster90]

In my diagnostic book, EO26 relates to "QDM CIRCUIT"....Please, what may that be <img src="http://forums.aaca.org/images/graemlins/smile.gif" alt="" /> ?

[Guest EDBSO]

If memory serves me well (I don't know after last weekend, lost a few brain cells, I believe beer, red meat, wine and good friends with many laughs were involved) it likely is your EGR valve that is toast. There are other things on the circuit that escape me but the problem is usually the EGR valve.

[javy1989]

E026 is a Quad Driver error

[javy1989]

CIRCUIT DESCRIPTION :

The ECM is used to control several components such as those illustrated above. The ECM controls these devices through the use of a quad-driver module (QDM). When the ECM is commanding a component "ON," the voltage potential of the output circuit will be "low" (near 0 volt). When the ECM is commanding the output circuit to a component "OFF," the voltage potential of the circuit will be "high." (Near battery voltage.) The primary function of the QDM is to supply the ground for the component being controlled. Each QDM has a fault line which is monitored by the ECM.

The fault line signal is available on the data stream for "Scan" tool test equipment. The ECM will compare the voltage at the QDM based on accepted values of the fault line. If the QDM fault detection circuit senses a voltage other than the accepted value, the fault line will go from a "low" signal on the data stream to a "high" signal and a code 26 will set if applicable. Some QDM circuits will switch from "low" to "high" normally.

Examples: QDM 2 - If A/C pressure switch closes and turns "ON" high speed coolant fan or QDM 3 - If the brake is depressed. These conditions are normal and no code 26 is set. These are accepted conditions. A fault on QDM 2 will not set a code 26, diagnosis may be done by making sure the A/C is turned "OFF".

[Guest EDBSO]

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">CIRCUIT DESCRIPTION :

The ECM is used to control several components such as those illustrated above. </div></div>

I still believe the EGR is one of the components on the circuit I could be wrong?

[Guest EDBSO]

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">If memory serves me well (I don't know after last weekend, lost a few brain cells, I believe beer, red meat, wine and good friends with many laughs were involved) it likely is your EGR valve that is toast. There are other things on the circuit that escape me but the problem is usually the EGR valve. </div></div>

Did the research and found it

E026 can set if any one of four malfunctions occur:

EGR coils open or wiring to EGR open.

Torque Converter lockup solenoid coil open or wiring to TCC open.

Air Conditioning relay or AC high speed relay coil open or wiring to such open.

Canister Purge or Low speed fan relay coil open or wiring to such open.

My E026 was the EGR.

[Roadster90]

Heck, I don't know what my EO26 could have been. I replaced the ECM and the prom again and the speedo started reading 151 mph and it coded the E026H ??? I put the other ecm back in and that much of the problem is gone..... <img src="http://forums.aaca.org/images/graemlins/confused.gif" alt="" /> <img src="http://forums.aaca.org/images/graemlins/confused.gif" alt="" /> <img src="http://forums.aaca.org/images/graemlins/confused.gif" alt="" /> <img src="http://forums.aaca.org/images/graemlins/confused.gif" alt="" /> <img src="http://forums.aaca.org/images/graemlins/confused.gif" alt="" />

[Guest EDBSO]

This is a little bit beyond me in as much as I haven't done it or seen it done but don't you have to replace the "chip" form the old one into the new one for everything to register properly and have everything recognized.

[padgett]

Sound like you had the wrong PROM for your car. The ECM is interchagable with a lot of other 3800 powered cars of the era but the PROM is wht makes it a Reatta (and each year is different).