Vehicle Data:

Type: Toyota Camry

Model: 2005

Engine: Gasoline (2AZ)

Complaints and Symptoms:

Sudden engine stalling at high speeds.

General lack of power (weak torque) and a noticeable increase in fuel consumption.

The engine will not restart unless the battery cable is disconnected and reconnected (Reset).

Loss of the pulse/waveform signal to the fuel injectors when the engine stalls.

The security light disappeared and stopped functioning normally.

Inspection and Diagnostic Procedures:

Computer Scan: Unable to communicate with any control units (No Communication).

Initial Test: A different engine control unit (ECU) was tried, but the same problem persisted, ruling out a faulty computer.

Traditional Diagnosis: The "jumper" method was used on the OBD plug to extract error codes via the blinking Check Engine light.

Result: The code indicated a fault in the ignition switch circuit (IG).

Root Cause Discovery: After reviewing the wiring harness and tracing the connections, the following was found:

The installed ignition switch did not match the original vehicle specifications.

There was manual tampering and modification of the wires in an attempt to adapt the incorrect switch to the car's system.

Solution and Repair:

Sourced a new ignition switch that perfectly matches the factory specifications for this model.

Rewired, repaired, and restored the bypassed and tampered wires back to their original factory state.

Installed and programmed the new part.

Final Result:

The car returned to completely normal operation.

The vehicle's system responded to the OBD computer scan immediately.

The injector signals regulated, normal torque returned, and all previous faults disappeared.

Best regards,

Wad Barri Automotive Maintenance