P1645

DTC P1645 BODY ECU MALFUNCTION

CIRCUIT DESCRIPTION

DTC Detecting Condition:

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

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

Step 1:

Step 1 (continued) - 2:

Step 3:

INSPECTION PROCEDURE

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, this 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.