P1645

DTC P1645 Gateway ECU Malfunction

DESCRIPTION

DTC Detection Condition:

The ECM receives the operating condition signal (ON/OFF) of the A/C from 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.).

Troubleshoot the Multiplex Communication System.

INSPECTION PROCEDURE

HINT: Read freeze frame data using the intelligent tester or the OBD II scan tool. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.