P1645

DTC P1645 Body ECU Malfunction

CIRCUIT DESCRIPTION

DTC Detecting Condition:

ECM receives the operating condition (ON/OFF) of A/C from A/C ECU. It also receives the electrical load information from the body ECU.

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

INSPECTION PROCEDURE
Perform troubleshooting the Multiplex Communication System.

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.