P1645

DTC P1645 GATEWAY ECU MALFUNCTION

CIRCUIT DESCRIPTION

DTC Detection Condition:

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 these information to control the engine (idle up, etc.).

INSPECTION PROCEDURE:
Troubleshoot the Multiplex Communication System. Refer to Information Bus.

HINT: Read freeze frame data using hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.