P1645

CIRCUIT DESCRIPTION

DTC Detection Condition:

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

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

Wiring Diagram:

Steps 1:

Step 2:

INSPECTION PROCEDURE

HINT: Read freeze frame data using TOYOTA 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.