Toyota Corolla (E120): Idle air control System/ Circuit

Dtc p0505 idle air control system

Dtc p0511 idle air control circuit

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Overhaul
Hint: components: 1. Drain manual transaxle oil (m/t transaxle) torque: 39.2 Nvm (400 Kgf·cm, 29 ft·lbf) 2. Drain automatic transaxle fluid (a/t transaxle) torque: 17.5 Nvm (178 Kgf·cm, 13 ft·lbf) 3. Remove front wheel 4. Remove engine under cover lh 5. Remove front axle hub lh nut ...

Check short circuit
If the wire harness is ground shorted as shown in fig. 5, Locate the section by conducting a resistance check with the body ground in step (b). Check the resistance with the body ground.  Disconnect connectors a and c and measure the resistance between terminals 1 and 2 ...

Circuit description
When the ignition switch is turned on, battery positive voltage is applied to the coilwhich closes the contacts of the efi main relay (marked: efi) and supplies power to terminal +b of the ecm. This signal causes current to flow to the coil, closing the contacts of the efi relay and supplyin ...