Circuit Description
WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
The ECM receives the operating condition signal (ON/OFF) of the A/C from the A/C ECU, and it also receives the electrical load information from the gateway ECU. The ECM uses this information to control the engine. DTC will set if no communication from body ECU and A/C ECU is detected by ECM for 10 seconds or more. Possible causes are:
- Faulty gateway ECU.
- Faulty A/C ECU.
- Faulty communication bus.