Camry Sedan L4-2.4L (2AZ-FE) (2003)
Engine Control Module: Component Tests and General Diagnostics
ECM POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
When the ignition switch is turned on, battery positive voltage is applied to 1G2 Relay, terminal IGSW of the ECM and the E.F.I. ECU relay control
circuit in the ECM sends a signal to terminal MREL of the ECM by switching on the E.F.I. ECU relay.
This signal causes current to flow to the coil, cutting off the contacts of the E.F.I. ECU relay and supplying power to terminals +B of the ECM.
Wirig Diagram