From the Toyota field service manual for my 2004 Corolla: "If there is a short between the taillight and brake light circuit inside a bulb, P0606 and P0607 may be stored."

 

Also, have your battery and alternator tested. "If the battery or the alternator are not providing proper electrical power to the ECM, the ECM will malfunction and the P0607 code may be triggered".

 

P0606 is ECM internal failure
P0607 is ECM input failure

ECM can be replaced in the vehicle.

To access, you have to remove the glove box.

1. Open the glove box
2. Push the side of the glove box to the inside. This will release the tab on the side of the box.
3. Then pull up to release the box off the hinge on the lower dash board.

To remove the ECM

1. There's 2 Xmas tree clips holding a flap door to the bottom of the ECM. Remove these first.
2. Remove 2 10mm bolts securing the ECM brackets to the dash board.
3. Slide the brackets out of the dash and the ECM can be pulled towards the floor.
4. Before disconnecting the connectors on the ECM, compare the orientation so that you will connect it correctly.
5. Transfer the brackets to the new ECM.
6. Remove the connector from the old ECM and plug it into the replacement ECU. Do this one at a time so that you don't connect it incorrectly.
7. Reassemble.

Note : the Xmas tree clips might break when removing. Mine has broken off and I just leave it alone.

Use row52 to locate the correct model vehicle that is the same as yours.

 

I read that a new ECM needs to be programmed for the vehicle. Is that not true?
Thank you again.

 

Just the keys. Because of the transponder chip in the key. Behind the ignition key is an amplifier to start the handshake with the ECU.

The ECU will just plug in and will start after the key is programmed.

 

Is there a step by step instruction manual showing how to do that?
Thank you.

 

I noticed there are websites selling the ECM as “plug and play”. Does that bypass the reprogramming of the keys and is that a good way to go?

 

The bypass is through the obdII port.

 

If there are LED's installed somewhere in the vehicle (usually tail lights or turn signals), these have been known to cause the car to be stupid. CONFIRM that the ECU is bad because it is the very last thing you should consider.

 

Yep, as I mentioned earlier: From the Toyota field service manual for my 2004 Corolla: "If there is a short between the taillight and brake light circuit inside a bulb, P0606 and P0607 may be stored.