2003 honda civic ex 1.7 l automatic 4 door sedan
The check engine light is ON, the immobilizer light is flashing, there is no communication with the scan tool. The tachometer is inoperative, the temperature gauge is inoperativ. The car runs sluggishly, no acceleration, engine cuts out (bogs down) at higher rpm's greater than 3,400 (when tac was working).
With the key on or off & Ecm's p31 unplugged from the ecm, and measuring voltage from dlc pin 5 (logic ground for ecm) to chassis ground, I get a 9 volt reading. With Ecm's p31 plugged into the ecm, (key on or off) and measuring voltage from dlc pin 5 to ground, the reading is o volts. Why does this happen, Is this normal? How does the logic ground function in relationship to the ecm?
have the same problem?
Tuesday, January 18th, 2011 AT 4:58 AM